1ZVN A. Application manual

Transcription

1 1ZVN A Application manual

2 1ZVN A 2 / 3 Table of contents 1 Rating Plate... 2 Tapchanger... 3 Bushing... 4 Cooling Equiptment... 5 Current Transformer... 6 Other Acessories... 7 Drawings... 8 Final Test Reports... 9 Assemblies and Oil Filling at Site Site Test and Commissioning Maintenance...

3 1ZVN A 1 Rating Plate

4

5 1ZVN A 2 Tapchanger Ref to 1ZVN C_Operation Manual

6 1ZSE Language en Rev. 4, On-Load Tap-Changers Type UZ Technical Guide L37034 ABB Components

7 Manufacturer s declaration The manufacturer ABB Components AB SE LUDVIKA Sweden Hereby declares that The products On-load tap-changers types UZE and UZF with motor-drive mechanism type BUF 3 comply with the following requirements: By design, the machine, considered as component on a mineral oil filled power transformer, complies with the requirements of Machinery Directive 89/392/EEC (amended 91/368/EEC and 93/44/EEC) and 93/68/EEC (marking) provided that the installation and the electrical connection be correctly realized by the manufacturer of the transformer (e.g. in compliance with our Installation Instructions) and EMC Directive 89/336/EEC regarding the intrinsic characteristics to emission and immunity levels and Low Voltage Directive 73/23/EEC (modified by Directive 93/68/EEC) concerning the built-in motor and apparatus in the control circuits. Certificate of Incorporation: The machines above must not be put into service until the machinery into which they have been incorporated have been declared in conformity with the Machinery Directive. Date Signed by... Olof Heyman Title Manager of Division for Tap-Changers This Technical Guide has been produced to allow transformer manufacturers, and their designers and engineers, access to all the technical information required to assist them in their selection of the appropriate on-load tap-changer and motor-drive mechanism. The guide should be used in conjunction with the Selection Guide and the Design Guides, to allow the optimum selection to be made. The technical information pertaining to on-load tap-changers and motor-drive mechanisms manufactured by ABB Components has been divided and is contained in separate documents, with one document for each type. The information provided in this document is intended to be general and does not cover all possible applications. Any specific application not covered should be referred directly to ABB Components AB, or its authorized representative. ABB Components AB makes no warranty or representation and assumes no liability for the accuracy of the information in this document or for the use of such information. All information in this document is subject to change without notice. ABB Components also manufactures the following products: De-energized tap-changers Transformer bushings Wall bushings GIS bushings Transformer cooling equipment

8 Table of Contents General Information 4 Design Principles 6 On-Load Tap-Changer 6 Epoxy-Resin Moulding 6 Selector Switch 6 Transition Resistors 7 Change-over Selector 7 Geneva Gear 7 Tap-Changer Tank 8 Oil Conservator 8 Accessories for the Tap-Changer 9 Special Applications 9 Motor-Drive Mechanism 9 Accessories for the Motor-Drive Mechanism _ 9 Motor-Drive Mechanism Cubicle 9 Degree of Protection 9 Principles of Operation 10 On-Load Tap-Changer 10 Switching Sequence 10 Selector Switch 10 Change-over Selector for Plus/Minus Switching 11 Change-over Selector for Coarse/Fine Switching 11 Through Positions 11 Motor-Drive Mechanism 12 Operational Description 12 Local Control 14 Remote Control 14 Through Positions 14 Step-by-Step-Operation 14 Protection against Running-Through 14 Contact Timing 14 Characteristics and Technical Data 15 On-Load Tap-Changer 15 Type Designation 15 Rated Phase Step Voltage 15 Standards and Testing 15 Rating Plate 15 Mechanical Life 16 Insulation Levels 16 Sound Level 16 Contact Life 16 Short-circuit Current Strength 17 Highest Phase Service Voltage Across the Regulating Winding 17 Rated Through-Current 17 Maximum Rated Through-Current 17 Occasional Overloading 17 Oil Temperature 17 Motor-Drive Ambient Air Temperature 18 Tie-in Resistors 18 Conductors from the Windings 18 Cable Lugs 18 Standard Version of Motor-Drive Mechanism 19 Control 19 Wiring Connection 19 Protection 19 Indication 19 Optional Accessories 20 Anti-Condensation Coverage 20 Outlet 20 Extra Heater 20 Hygrostat 20 Tropical Version 20 Extra Multi-Position Switches 20 Design, Installation and Maintenance 21 On-Load Tap-Changer with Motor-Drive Mechanism 21 Design Differences between the UZE and UZF On-Load Tap-Changers 21 Schematic Diagrams 22 Drying 26 Painting 26 Weights 26 Oil Filling 26 Installation 26 Maintenance 26 Pressure Relay 27 General Description 27 Design 27 Operation 27 Function Pressure 27 Testing 27 Dimensions, On-Load Tap-Changer Type UZE 28 Dimensions, On-Load Tap-Changer Type UZF 29 On-Load Tap-Changers Types UZE and UZF with Accessories 30 Oil Conservator for UZF 31

9 The UZ types of on-load tap-changers operates according to the selector switch principle, that is, the tap selector and diverter switch functions are combined in one. The UZ types of on-load tap-changers are mounted on the outside of the transformer tank. All of the equipment necessary to operate the tap-changer is contained in a single compartment, with the motor-drive mechanism attached to the outside. Because the UZ types are designed for mounting on the outside of the transformer tank installation procedures are simplified and the overall size of the transformer tank can be reduced. General Information Standard tanks are designed for the UZ types. The standard tanks have a number of standard flanges to get great flexibility for accessories. Standard accessories are pressure relay and oil valve. See Figs. 1a and 1b. A great number of extra accessories can be ordered. See Figs. 2a and 2b. As a design option, the UZ types can be supplied without the tank. This gives the transformer manufacturer the flexibility to design the tap-changer tank as an integral part of the transformer tank. Fig. 1a. On-load tap-changer type UZE L37037 with standard accessories. Fig. 1b. On-load tap-changer type UZF with standard accessories. L37023 Fig. 2a. On-load tap-changer type UZE with extra accessories. L37036 Fig. 2b. On-load tap-changer type UZF with extra accessories. L

10 Connection to oil conservator Cover for access to conductors Lifting eye Motor-drive mechanism Attachment flange to transformer tank Connection for oil filter unit Gasket Terminal Front cover Geneva gear Selector switch unit Pressure relay Insulating shaft Change-over selector Fixed contact Test valve Moving contact system Test connection Shielding-ring Oil valve On-load tap-changer tank Transition resistor Fig. 3. Design principle of on-load tap-changer type UZF 5

11 On-Load Tap-Changer The tap-changer is built-up by using single-phase units, each identical, mounted in the openings on the rear of the compartment. Each single-phase unit consists of an epoxy-resin moulding, a selector switch, transition resistors and, in most cases, a change-over selector. Epoxy-Resin Moulding Design Principles Selector Switch The selector switch consists of fixed contacts and a moving contact system. The fixed contacts are mounted onto a bracket which is screwed onto the terminals previously moulded into the epoxy-resin moulding. Each fixed contact has two contact paths, one for the main moving contact and one for the moving switching contacts. The one-piece moulding provides a bushing between the transformer and the tap-changer. The conductors are moulded into position to connect the fixed contacts to the terminals for connection to the transformer windings. Also moulded into the unit are bearings for the selector switch and the change-over selector. The terminals on the moulding are numbered according to the schematic diagrams, see the section Design, Installation, and Maintenance contained in this Guide. The moving contact system consists of the main contact, the main switching contact and two transition contacts. The system is built as a rigid unit rotated by a common drive-shaft. In the service position the load current is carried by the moving main contact, which consists of two contact fingers, pressed onto the fixed contact by springs. The moving switching contacts and the transition contacts are made as rollers, see Fig. 5, which move over the knife-like fixed contacts. The making and breaking takes place between the fixed and moving switching contacts. The switching contacts are made of copper/tungsten, or in the case of tap-changers for lower currents, the contacts are made of copper. Fig. 4. One phase of an on-load tap-changer type UZ L Fig. 5. Moving contact system 6

12 Transition Resistors The resistors are made from spirally wound wire mounted on insulating bobbins. They are connected between the moving main contact and the transition contacts. Change-over Selector The change-over selector is used for reversing the regulating winding or for changing connection in the coarse/fine regulation. The selector consists of a moving contact and two fixed contacts. The moving contact is fixed to a shaft and is supported by a bearing in the moulding. The current is carried by the four contact fingers of the moving arm, and transferred to the fixed contacts. The change-over selector does not make or break the current during operation. Fig. 6. Selector switch Geneva Gear The Geneva gear principle is used to change a rotary motion into a stepping motion. Drive is transmitted directly from the motor-drive mechanism to the Geneva gear. The Geneva gear operates the selector switch and the change-over selector. The Geneva gear is also used to lock the moving contact system when it is in position. Fig. 7. 7

13 Tap-Changer Tank A standard tank is designed for each size of UZE and UZF. The standard tanks have a number of standard flanges intended for a great variety of accessories. Flanges that are not used are mounted with greyblue covers. Adapter flanges can be bolted on if the sizes of the standard flanges not are suitable. Standard accessories are pressure relay and oil valve. A great number of extra accessories can be ordered. Dimensions and accessories for the tap-changer tanks are shown on pages 28 to 31. The tap-changer tank can be bolted (standard) or welded to the transformer tank. A non-standard tank can also be ordered, but to a higher price and a longer delivery time than the standard tank. When the on-load tap-changer operates, arcing occurs in the tap-changer. To avoid contamination of the transformer oil, the tap-changer is housed in its own tank separated from the transformer oil. All components that make and break the current during the operation of the tap-changer are located in the tap-changer tank. The tap-changer tank is separated from the transformer tank by a vacuum-proof barrier, designed to withstand a maximum test pressure of 100 kpa, at a maximum of 60 o C. The barrier and the gasket are oil-tight, which means that they are designed and routinely tested for a permissible air leak at each leak location of cm 3 /s, at a pressure difference of 100 kpa and a temperature of 20 o C. This safely guarantees the contaminated tapchanger oil to remain separated from the transformer oil. It should be noted that the barrier has not been designed to allow for a simultaneous over-pressure on one side, and vacuum on the other. All models are supplied with an oil valve, for filling and draining. Fig. 8a. UZE standard tank TC_00267 Fig. 8b. UZF standard tank TC_00267 Oil Conservator Normally the oil compartment of the tap-changer shall be connected to a conservator, separated from the oil of the transformer. If the transformer oil is to be supervised by gas-in-oil analyses, the conservator for the tap-changer oil should have no connection to the conservator of the transformer on either the oil or the air side. For use on a sealed tank transformer a special version can be supplied, in which UZE includes the volume needed for oil expansion, an oil level indicator and a breather. UZF needs an own conservator, which can be supplied mounted on the top of the tap-changer tank. The oil pressure difference between the transformer and the tap-changer should not exceed 10 kpa or 1.2 metres oil column. If the pressure difference is between 10 and 70 kpa a reinforced barrier should be ordered. For the version for sealed tank transformers the pressure difference is allowed to be up to 70 kpa (10 Psi) and for that version the reinforced barrier is delivered. The set point for the pressure relay connected to the UZ tank is 50 kpa (7 Psi). For further information, see page 27 or pamphlet 1ZSE

14 Accessories for the Tap-Changer Accessories for the tap-changer are shown on dimension prints on pages 30 and 31. For a list of accessories see the Selection Guide or consult ABB Components. Special Applications ABB Components should be consulted for all special application tap-changers, such as sealed tank transformers or transformers for use with arc-furnaces and converters. Fig. 9. Motor-drive mechanism Motor-Drive Mechanism The motor-drive mechanism provides the drive to allow the tap-changer to operate. As the name implies, drive is provided from a motor through a series of gears and on to a spring energy storage device, which when fully charged, operates the tap-changer via a drive shaft. Several features are incorporated within the mechanism to promote long service intervals and reliability. For a detailed operating description, see the section Principles of Operation contained in this guide. Accessories for the Motor-Drive Mechanism Motor-Drive Mechanism Cubicle The cubicle is manufactured from steel and is welded to the outside of the tap-changer tank. The door, which can be padlocked, forms a cap around the mechanism to allow easy access to all the working parts. Vents, with filters, and a heater are fitted to ensure that the mechanism remains operative in varied climates. Degree of Protection The motor-drive mechanism has passed a test for IP 54 according to IEC 529. Accessories for the motor-drive mechanism are described on page 20. For a list of accessories see the Selection Guide or consult ABB Components. 9

15 On-Load Tap-Changer Switching Sequence The switching sequence is designated the symmetrical flag cycle. This means that the main switching contact of the selector switch breaks before the transition resistors are connected across the regulating step. This ensures maximum reliability when the switch operates with overloads. Principles of Operation At rated load the breaking takes place at the first current zero after contact separation, which means an average arcing time of approximately 6 milliseconds at 50 Hz. The total time for a complete sequence is approximately 50 milliseconds. The tap change operation time of the motor-drive mechanism is approximately 3 seconds per step. Selector Switch Fig. 10c. The transition contact M1 has made on the fixed contact 2. The load current is divided between the transition contacts M1 and M2. The circulating current is limited by the resistors. The switching sequence when switching from position 1 to position 2 is shown in the diagrams of Figs. 10a-e below. The moving contact H is shown as one contact but consists in fact of two, the main contact and the main switching contact. The main contact opens before and closes after the main switching contact. Fig. 10d. Fig. 10a. The transition contact M2 has broken at the fixed contact 1. The transition resistor and the transition contact M1 carry the load current. Position 1. The main contact H is carrying the load current. The transition contacts M1 and M2 are open, resting in the spaces between the fixed contacts. Fig. 10e. Fig. 10b. The transition contact M2 has made on the fixed contact 1, and the main switching contact H has broken. The transition resistor and the transition contact M2 carry the load current. Position 2. The main switching contact H has made on the fixed contact 2. The transition contact M1 has opened at the fixed contact 2. The main contact H is carrying the load current. For plus/minus and coarse/fine switching, the changeover selector is used. 10

16 Change-over Selector for Plus/Minus Switching The switching sequence, when the change-over selector R changes over for plus/minus switching, is shown in the diagrams of Figs. 11a and 11b. The contact arm of the selector switch has reached the fixed contact 12 after switching from the fixed contact 11. The fixed contact 12 is wide enough to cover the whole distance between two positions of the selector switch. It is connected to the end of the main winding. The contact arm of the selector switch has travelled on to the contact 12, and the change-over selector R is in offload condition. The load current goes directly from the main winding through the contact 12 and out through the current collector at the centre of the contact arm. The upper end of the regulating winding is still connected to the main winding. This is the service position. Fig. 11a. Service position The contact arm of the selector switch has travelled further on the contact 12 without any breaking or making of the current. At the same time the contact arm of the change-over selector R, has travelled from contact B to contact C, through which the lower end of the regulating winding has been connected to the main winding. This is called a through position, see Through Positions. Fig. 11b. Through position Change-over Selector for Coarse/Fine Switching The mechanical switching is exactly the same as for the plus/minus switching, the electrical switching is different however. The change-over selector connects or disconnects the coarse winding. Through Positions A so called Through Position is a position the tapchanger has to pass without changing the ratio of the transformer. Figs. 11a-b shows how the change-over selector is operated, while the selector moves over the double fixed contact. The extra position has the same number on the scale of the position indicator, together with a letter, e.g. 12A. There might be need for more through positions over the operating range if the number of taps of the winding is less than the number of mechanical positions of the selector. The motor-drive will automatically pass the through positions. 11

17 Motor-Drive Mechanism Indicating device Outgoing drive shaft Spring energy storage device Driving disc Mechanical limit stop Disc brake Drive pin Flywheel Cam wheel Spur gears Motor V-belt Limit switch Maintaining contact Fig. 12. Operational Description Drive is via a V-belt from the motor transmitted through a system of spur gears to the drive pin of the cam wheel. The spring energy storage device is charged by this pin. During the rotation the cam wheel drive pin tensions the springs. When the drive pin reaches its lowest position on the cam wheel the springs are released, and with the assistance of the flywheel, the drive is transmitted to the outgoing drive shaft and the driving disc. The driving disc operates the Geneva gear within the tap-changer. The flywheel is stopped by a disc brake, which also operates the starting contact. The outgoing drive shaft, via a chain, drives the Geneva gear of the indicating device. The indicating device consists of the mechanical position indicator, the mechanism for operating the electrical and mechanical limit stop, and the position transmitter. The maintaining contact is operated by the cam wheel. 12

18 Fig. 13. Circuit diagram The following is a detail list for the circuit diagram in Fig. 13 and the contact timing diagram in Fig Control selector switch, local/remote 2 Control switch, raise/lower 3 Contactor, raise 4 Contactor, lower 5 Starting contact 6 Maintaining, interlocking and auxiliary contact 7 Motor 8 Limit switch: 8.1 Lower tap position 8.2 Upper tap position 11 Interlocking switch, open when hand crank is fitted 12 Anti-condensation heater 14 Position transmitter, potentiometer 15 Continuation contact 19 Protective motor switch 21 Contactor, step-by-step operation 36 Cabinet light 37 Switch, door operated 43 Time relay, running-through protection 51 Emergency stop push button Remote control Local control Protective earth Raise operation Lower operation Crank 13

19 Contact Tap pos Raise operation Tap pos Tap pos Lower operation Tap pos Upper limit pos Lower limit pos T1 Starting range T2 Spring charging starts T3 Spring release T4 Selector switch operates T5 Stopping range Fig. 14. Contact timing diagram Note: The numbered references under the following sections are to the circuit diagram in Fig. 13 and the contact timing diagram in Fig. 14. Local Control Control selector switch (1) in position LOCAL. Raise impulse is given by control switch (2). Contactor (3) is thereby energized and will remain so by starting contact (5:1-2) and its own holding contact. The motor (7) starts running and soon the maintaining contact (6:3-4) closes and takes over control of the motor contactor (3). The brake is released and the starting contact (5:1-2) opens. The springs are set and will be released when fully charged, and operate the tap-changer. Maintaining contact (6:3-4) opens and the contactor disconnects the motor. The brake is applied, the starting contact (5:1-2) closes and the tap change operation is completed. The lowering operation is carried out in a similar manner. Remote Control Control selector switch (1) in position REMOTE. The signal for the operation is then received from the control circuits for raise and lower impulses connected to terminals as shown in Fig. 13. Local operation is not possible when switch (1) is in position REMOTE, and remote operation is not possible in position LOCAL. Through Positions A so called Through position, is a position the tapchanger has to pass without changing the ratio of the transformer. These positions are passed automatically. The continuation contact (15) bridges the maintaining contacts (6:3-4 and 6:1-2) via auxiliary contacts on raise contactor (3) at through positions. In this way the contactor (3) raise, or (4) lower, is kept energized and the motor will automatically make another operation. Step-by-Step-Operation Step-by-step relay (21) connected so that only one tap change operation is obtained each time the raise/lower switch is operated. Protection against Running-Through A relay (43) stopping the motor-drive mechanism in case of a a failure of the step-by-step control circuit which would cause a running-through of the motor-drive mechanism. The relay energizes the trip coil in the protective motor switch (19). Contact Timing The contact timing diagram, Fig. 14, shows the contact sequences for one change of tap position for raise and lower directions. 14

20 Characteristics and Technical Data On-Load Tap-Changer Type Designation Type E Insert upright F Insert inclined Type of switching L Linear R Plus/Minus D Coarse/Fine Type of connection N Three-phase star point T Three-phase fully insulated E Single-phase (option) U Z... Impulse withstand voltage 200 kv, 250 kv, 380 kv, 550 kv, 650 kv Maximum rated through-current 150 A, 300 A, 600 A XXX/YYY Standards and Testing The UZ types of on-load tap-changers fulfill the requirements according to IEC standard, publication 214. The type tests include: Contact temp. rise test Switching tests Short-circuit current test Transition impedance test Mechanical tests Dielectric test Rating Plate The routine tests include: Check of assembly Mechanical test Sequence test Auxiliary circuits insulation test Vaccum test Final inspection Number of positions Linear switching: Plus/Minus switching: Coarse/Fine switching: max 17 positions max 33 positions max 29 positions Rated Phase Step Voltage The maximum allowable step voltage is limited by the electrical strength and the switching capacity of the selector switch. It is therefore a function of the rated through-current as shown in Figs. 16 and 17 below. Fig. 15. Example of rating plate fm_00214 Step voltage Step voltage Fig A Rated through-current Tap-changer with: max 11 positions, linear max 23 positions, plus/minus max 23 positions, coarse/fine A Rated through-current Tap-changer with: positions, linear positions, plus/minus positions, coarse/fine Fig

21 Mechanical Life The mechanical life of the tap-changer is based on an endurance test. The test showed that the mechanical wear was negligible, and that the tap-changer was still mechanically sound after one million operations. Insulation Levels Dielectric tests are carried out according to IEC 214, Clause 8.6. The test object was immersed in clean transformer oil with a withstand value of at least 160 kv/cm. In table 1, withstand levels are indicated as lightning impulse power frequency withstand voltages. Sound Level During tap-changing the equivalent continuous sound pressure level is about 65 db (A) measured one metre from the tap-changer. Contact Life The predicted contact life of the fixed and moving contacts of the selector switch, is shown as a function of the rated through-current in Fig. 18. The values are calculated from the results of the service duty tests. For step voltages equal to or below 40 V at 50 Hz and equal to or below 50 V at 60 Hz the predicted contact life is always operations. Number of Operations A A Rated through-current Fig. 18. Predicted contact life 300 A- 600 A 50 Hz 60 Hz UZE/F Insulation levels kv Permissible service voltage between phases On-load tap-changer type to earth between phases for fully insulated design UZE.T and UZF.T 1) fully insulated 1) kv 200/ / / / / ) Class II according to IEC 214. Clause Between Between the first Between any Across electrically and the last electrically non- change-over Type of Number of adjacent contacts, contacts, a2 adjacent contacts, selector, c1 switching positions a1 (Fig. 19) (Figs ) a3 (Fig. 19) (Figs. 20 and 21) Linear Plus/minus Coarse/fine Table 1. Insulating levels Fig. 19. Linear switching Fig. 20. Plus/minus switching Fig. 21. Coarse/fine switching 16

22 Short-circuit Current Strength The short-circuit current strength is verified with three applications of 2 seconds duration, without moving the contacts between the three applications. Each application has an initial value of 2.5 times the rms value. Max rated through current A rms ) ) Reinforced performance Table 2 Three applications of 2 seconds duration A rms Highest Phase Service Voltage Across the Regulating Winding The table below, Table 3, shows the highest permissible phase service voltage for different types of switching and different number of positions. Highest service Type of Number of voltage switching positions Insulation across kv Linear 17 Regulating winding 22 Plus/minus 29 Regulating winding Regulating winding 15 Maximum Rated Through-Current The UZ models are designed for maximum rated through-currents of 150 A, 300 A or 600 A. Occasional Overloading If the rated through-current of the tap-changer is not less than the highest value of tapping current of the tapped winding of the transformer, the tap-changer will not restrict the occasional overloading of the transformer, according to IEC 354 (1991), ANSI/IEEE C57.92 and CAN/CSA-C88-M90. To meet these requirements, the UZ models have been designed so that the contact temperature rise over the surrounding oil, never exceeds 20 K at a current of 1.2 times the maximum rated through-current of the tapchanger. The contact life stated on the rating plate, and given in this guide, is given considering that overload currents of maximum 1.5 times the rated through-current occur during a maximum of 3% of the tap-changer operations. Overloading in excess of the above results in increased contact wear and shorter contact life. Oil Temperature The temperature of the oil in the on-load tap-changer shall be between -25 and +80 o C for normal operation, as illustrated below. Coarse/fine 29 Fine regulating winding Coarse regulating winding Fine and coarse regulating 35 1) winding 1) For 3-phase star point design BIL kv BIL kv Table 3 Rated Through-Current The rated through-current of the tap-changer is the current which the tap-changer is capable of transferring from one tapping to the other at the relevant rated step voltage, and which can be carried continuously whilst meeting the technical data in this document. The rated through-current determines the dimensioning of the transition resistors and the contact life. o C ) 2) 3) 4) 5) 1) No operations allowed 2) Emergency overloading. The on-load tap-changer will not restrict the occasional overloading of the transformer according to the standards in section Occasional Overloading above. 3) Normal operating range 4) For operation within this range, the viscosity shall be between m 2 /s (=cst) 5) Operation with de-energized transformer only The rated through-current is stated on the rating plate, Fig. 15. Fig. 22. On-load tap-changer oil temperature fm_

23 Motor-Drive Ambient Air Temperature The ambient air temperature requirements for the motordrive mechanism are shown in Fig. 23. The normal ope-rating range is between -40 and +60 o C. Tie-in Resistors If the service voltage and the winding capacitances are such that the recovery voltage of the change-over selector exceeds 40 kv, it must be limited to this value or lower, by means of a tie-in resistor. The tie-in resistors can be placed in the tap-changer tank for UZE and UZF models BIL 200, 250 and 380 kv. For UZE and UZF models BIL 550 and 650 kv the tie-in resistors are placed in the transformer tank. There is usually a need for tie-in resistors for UZ models, BIL 550 and 650 kv, when delta-connected and placed in the line ends of the windings. Design information on tie-in resistors is provided in a separate document, On-Load Tap-Changer Tie-in Resistors, E-28. Conductors from the Windings The temperature of the conductors connected to the terminals on the back of the on-load tap-changer must not exceed 30 K over the surrounding oil. Cable Lugs The Cat. No. and required quantity should be ordered separately according to the tables below. o C ) 2) 3) 4) 5) 1) The motor-drive mechanism must be shaded from sun radiation by screens. It must be specially equipped if the ambient temperature exceeds +70 o C. 2) Normal operating range. (Normal heater shall operate.) The temperature inside the cabinet must not exceed +75 o C. 3) Extra 250 W heater should be used. 4) Extra 250 W heater and anticondensation coverage should be used. 5) ABB Components should be consulted. Fig. 23. Motor-drive mechanism ambient air temperature Hole diam. For cable Cat. No. Mass Ø mm area mm 2 kg LL A B C D E F 0.16 fm_00216 Required quantity of cable lugs per tap-changer Linear Plus/minus Coarse/fine Number 3-phase 3-phase 3-phase 3-phase 3-phase 3-phase of star fully star fully star fully positions point insulated point insulated point insulated

24 Standard Version of Motor- Drive Mechanism Control Control selector switch, local/remote Control switch, raise/lower Handcrank for manual operation Wiring Connection The wiring is of grey polyvinylchloride-insulated, stranded wire. Type and data see table below. Every wire is marked with figures corresponding to terminal numbers. All external connections are made to disconnectible terminals of thermosetting resin. Type and data see table below. Short circuit protection (fuses) for motor, control and heater supplies, if required, should be installed in the control cabinet or other separate compartment. Protection Protective switch for the motor with thermal overload release and magnetic overcurrent release. Limit switches in both control and motor circuits. Mechanical end stops. Interlocking contact in the control circuit to prevent electrical operation during manual operation. Interlocking contacts in raise and lower control circuits to prevent operation in wrong direction of rotation (with wrong phase sequence). Motor contactors are electrically interlocked. Protection against running-through in case of a failure of the step-by step control circuit. Emergency stop push button. Indication Mechanical position indicator Drag hands for max. and min. position indication Tap change in progress indicating red flag Operation counter Position transmitter (potentiometer) for remote position indication, 10 or 50 ohms per step. Special version Subject Standard version Alternative version at an additional price Motor voltage / V, 208/360 V, 3-phase, 60 Hz 120 V, 240 V, 1-phase, 60 Hz 3-phase, 50 Hz / V, 3-phase, 60 Hz 110 V, 220 V d.c V, 3-phase, 60 Hz Optional Current 1.2/0.7 Rated output 0.18 kw Speed 1370 rev/min Voltage for control circuit V, 50 Hz 110 V, 120 V, 240 V, 50 Hz 110 V, 220 V, d.c V, 60 Hz 110 V, 120 V, 208 V, 60 Hz Optional Voltage for heater V V, 260 V Optional Mechanical position lowest position middle position Optional indicator marked 1 marked N (Normal position) Terminal blocks Number of terminals supplied 33-Phönix URTK/S Ben 61 A, 500 V, A.C.acc. to VDE Cross sectional area: sqmm Max. number that can Phönix UK 4 be accomodated Weidmüller SAK Phönix URTK/S Ben 48 - General Electric EB Critchley S 300 (OBA) Cabling Type H07V2-K, 1.5 sq mm, 750 V Optional 90 o C Test voltage on control circuits 2 kv (50 Hz, 1 min) Anti-condensation heater (Functions without extra heater down to -40 o C) 50 W Additional 250 W Operating time Number of turns per operation of the handcrank 20 approx. 3 seconds Degree of protection of cabinet IEC 529, IP 54 19

25 Optional Accessories Anti-Condensation Coverage The motor-drive cabinet inside can be supplied with an anti-condensation coverage. Outlet Socket outlet according to DIN or ANSI. Prepared for socket outlet, i.e. holes are cut out in the panel and cables are wired to the panel for the outlet. Extra Multi-Position Switches Extra Heater Extra heater, 250 W, with thermostat and switch for e.g. use in arctic climate. Hygrostat For tropical climate the heater can be controlled by a hygrostat. Tropical Version The motor-drive mechanism can be equipped to meet the requirements for humid tropical climate and desert conditions. Type Symbol Number of contact rows 1 Extra position transmitter 1 2 Break before make 1 3 Make before break 1 4 Voltage transformer switch (Furnace) 1 5 Step switch for parallel control 2 6 Follower switch for parallel control 2 Note: Master switch for parallel control is a break before make multi-position switch. Maximum 10 extra contact rows can be accomodated. If more than 4 extra contact rows are ordered a special drive system for the switches is required (extra price). 20

26 Design, Installation and Maintenance On-Load Tap-Changer with Motor-Drive Mechanism Design differences between the UZE and UZF On-Load Tap-Changers The basic design difference between the UZE model and the UZF model is the inclining of the active part within the UZF tank to allow easier access to the terminals. Access to the terminals is via a connection cover on the top of the tank. Both UZE and UZF are completely filled with oil and have no gas/air cushion. Fig. 24. UZFRT 650/600 seen from the connection side L Fig. 25. The UZF-design makes the connection of the transformer leads to the Tap- Changer easy L Intermediate flange Connection cover Connection cover Transformer winding Transformer leads Transformer tank UZE UZF Fig

27 Schematic Diagrams Table 4 shows all the basic connection diagrams for the UZE and UZF series of on-load tap-changers. The basic connection diagrams illustrate the different types of switching and the appropriate connections to the transformer windings. The diagrams illustrate the connections with the maximum number of turns in the transformer winding connected in position 1. The tapchanger can be connected in such a way that position1 gives a minimum effective number of turns in the transformer winding with the tap-changer in position 1. Linear Plus/Minus Coarse/Fine Max Regulating Steps Max Voltage Positions Regulating Steps Number of Loops 6 Tap Positions (Electrical) 7 8 Regulating Steps Number of Loops 8 Tap Positions (Electrical) 9 10 Regulating Steps Number of Loops 10 5 Tap Positions (Electrical)

28 Linear Plus/Minus Coarse/Fine 12 Regulating Steps Number of Loops Tap Positions (Electrical) Regulating Steps Number of Loops Tap Positions (Electrical) Regulating Steps Number of Loops Tap Positions (Electrical) Regulating Steps Number of Loops 10 9 Tap Positions (Electrical)

29 Plus/Minus Coarse/Fine 20 Regulating Steps Number of Loops Tap Positions (Electrical) Regulating Steps Number of Loops Tap Positions (Electrical) Regulating Steps Number of Loops Tap Positions (Electrical) Regulating Steps Number of Loops Tap Positions (Electrical)

30 Plus/Minus Coarse/Fine 28 Regulating Steps Number of Loops Tap Positions (Electrical) Regulating Steps Number of Loops 15 Tap Positions (Electrical) Regulating Steps Number of Loops 17 Tap Positions (Electrical) 33 Table 4. Basic connection diagrams for the UZE and UZF series of on-load tap-changers 25

31 Drying Drying of the tap-changer is not normally necessary. If the tap-changer is to be subjected to a drying process, ABB Components should be consulted. Painting The tap-changer tank and the motor-drive mechanism cabinet can be supplied with various types of painting. The standard painting consists of a rust protective primer both inside and outside, and a finishing coat inside the tap-changer tank and the motor-drive mechanism cabinet. As an option, the tap-changer may also be delivered ready with a finishing coat outside. Special painting will be quoted for on request. Weights Table 5 contains the weights of all the models in the UZ range of on-load tap-changers. The motor-drive mechanism and the oil volume is included in the overall weight. On-load tap-changer Approx. weight in kg Tap-changer Required Total Type designation without oil oil UZELN, 200/150, 300, UZELT, 250/150, 300, UZEDN, 380/150, 300, UZEDT, 550/150, 300, UZERN, 650/150, 300, UZERT UZFLN, 200/150, 300, UZFLT, 250/150, 300, UZFDN, 380/150, 300, UZFDT, 550/150, 300, UZFRN, 650/150, 300, UZFRT Example underlined in the table above: UZFRT 550/300 Table 5 } } Oil Filling For the correct oil filling procedure, consult the appropriate Installation and Commissioning Guide. Installation For installation instructions, consult the appropriate Installation and Commissioning Guide. Maintenance The UZ range of on-load tap-changers have been developed over many years to provide a maximum of reliability. The simple and rugged design gives a service life that equals the service life of the transformer. A minimum of maintenance is required for absolutely trouble-free operation. The only parts that require maintenance during the service life are the contacts that may need to be replaced, and the motor-drive mechanism. Maintenance is easy to carry out since the design provides for quick and easy access and inspection. The front-cover is just removed after the oil has been drained, providing access to the entire selector switch mechanism. An annual inspection should be carried out to read the counting device. These readings are used to determine when overhaul is due. Overhaul shall normally be carried out every seven years, and consists of checking the dielectric strength of the oil, filtering the oil, and checking contact wear according to the Maintenance Guide. The motor-drive mechanism should also be checked and lubricated, and the pressure relay checked. The Maintenance Guide should be consulted if you need further information. 26

32 Pressure Relay General Description ABB Components Two single-pole switching contacts One single-pole switching contact Cable gland ~35 ~200 NO NC C NO NC C NO NC C ,, ~155 Connection for test equipment Fig. 27. fm_00213 General Description Protection for the on-load tap-changer is provided by a pressure relay which is mounted on the tap-changer tank. In the event of an over-pressure in the tank, the relay will trip the transformers main circuit breakers. After a pressure relay trip, the tap-changer must be opened and carefully investigated according to the Repair Guide. Faults, if any are located, should be repaired before the tap-changer is energized. Design The pressure relay is mounted on a three-way valve. On the other two outlets of the valve there is a connection flange on one side, and a connection for test equipment on the other, see Fig. 27. The pressure relay housing is made of copper-free aluminium alloy and is externally coated with an enamel. A stainless steel model can be provided on request. The pressure relay has been pre-set by the manufacturer. The pressure relay is sealed to avoid unauthorized entrance. The electrical connection shall be made to the terminal block inside the pressure relay housing. These measures are done to ensure a safe function. The pressure relay is designed for one or two switching elements. Operation When the pressure acting on the face of the piston exceeds the spring load of the piston, the piston will move and activate the switching element. The operation time is less than 10 ms. The operation time is the time it takes from the pressure in the tapchanger tank exceeds the function pressure, until the pressure relay gives a stable signal for operation of the transformer main circuit breakers. Function Pressure Breaking capacity Withstand voltage Voltage Resistive Inductive between open load load contacts 110 V DC 0.8 A 0.2 A L R < 40 ms 125 V DC 0.6 A 0.15 A L R < 40 ms 220 V DC 0.4 A 0.1 A L R < 40 ms 125 V AC 5 A 5 A cos ϕ > kv, 50 Hz, 1 min The function pressure (trip pressure) is 50 kpa (7 Psi) if the oil level is less than 4 metres above the level of the pressure relay. Pressure relay with higher function pressure can be delivered on request. Testing At commissioning of the transformer and for testing the pressure relay, the instructions in the Installation and Commissioning Guide should be consulted. 250 V AC 2.5 A 2.5 A cos ϕ > 0.4 Table 6. 27

33 Dimensions, On-Load Tap-Changer, type UZE All dimensions are in millimetres unless otherwise stated. It should be noted that the dimensions may change with specific models. A1 B1 P H H1 P1 B B2 A Max 135 o R Opening 300 x 100 Fig. 28. Dimensions, on-load tap-changer, type UZE standard tank with standard accessories. TC_00179 Type BIL Dimensions (mm) UZE kv A A 1 B B 1 B 2 H H 1 P P 1 R Three-phase , Table 6. Dimensions, on-load tap-changer, type UZE 28

34 Dimensions, On-Load Tap-Changer, type UZF All dimensions are in millimetres unless otherwise stated. It should be noted that the dimensions may change with specific models. A1 B1 P H H1 H2 P2 P1 B B2 A Max 135 o R Opening 300 x 100 Fig. 29. Dimensions, on-load tap-changer, type UZF standard tank with standard accessories. TC_00180 Type BIL Dimensions (mm) UZF kv A A 1 B B 1 B 2 H H 1 H 2 P P 1 P 2 R Three-phase , Table 7. Dimensions, on-load tap-changer, type UZF 29

35 On-Load Tap-Changer, type UZE with Accessories (standard and options) Pressure relief valve Valve for oil filtration Oil level indicator (with or without alarm) Cable box for alarmed oil level indicator Flange for oil conservator, or breather Dehydrating or one way breather Pressure relay Thermoswitch housing Valve for oil filling, draining and filtration Fig. 30. On-load tap-changer, type UZE with accessories. TC_00181 On-Load Tap-Changer, type UZF with Accessories (standard and options) Flange for oil conservator Pressure relief valve Valve for oil filtration Pressure relay Thermoswitch housing Valve for oil filling, draining and filtration Fig. 31. On-load tap-changer, type UZF with accessories. TC_

36 Oil Conservator for UZF L Oil level indicator (with or without alarm) Oil conservator for UZF (only when ordered) 515 Cable box for alarmed oil level indicator 645 Dehydrating breather Fig. 32. Dimensions, oil conservator for on-load tap-changer, type UZF TC_00182 UZF BIL Dim Conservator kv L 200, , Table 8. Dimensions, oil conservator for on-load tapchanger, type UZF 31

37 1ZVN A 3 Bushing Ref to 1ZVN C_Operation Manual

38 Transformer bushings, type GOB Technical guide

39 This Technical Guide has been produced to allow transformer manufacturers, and their designers and engineers, access to all the technical information required to assist them in their selection of the appropriate Transformer Bushing. The Guide should be used in conjunction with the Selection Guide to allow the optimum selection to be made. The technical information pertaining to bushings manufactured by ABB Components has been divided into separate documents, with one document for each type. The information provided in this document is intended to be general and does not cover all possible applications. Any specific application not covered should be referred directly to ABB Components AB, or its authorized representative. ABB Components AB makes no warranty or representation and assumes no liability for the accuracy of the information in this document or for the use of such information. All information in this document is subject to change without notice. ABB Components also manufactures the following products: Wall bushings GIS bushings On-load tap-changers Motor-drive mechanisms 2

40 Table of Contents Design 4 Shed form 4 Test tap 5 Testing 5 Test tap adapter 5 Common specifications 5 Dimensions 6 Bushings without oil level gauge 6 Electrical data 7 Dimensions 8 Bushings with oil level gauge 8 Electrical data 9 Connection details 10 Inner terminal 10 Solid rod conductor 10 Outer terminal assembly 10 Separate terminal plate with bolts 11 Arcing horns 11 Conductor loading 11 Overloading of bushings 11 Short-time current 11 Ordering particulars 12 Bushings without oil level gauge 12 Bushings with oil level gauge 14 Recommendations for positioning _ 16 3

41 Design The bushing is built up around a centre tube on which the condenser body is wound. The upper insulator, lower insulator and mounting flange are held between the end plates by the centre tube. Sealing is accomplished by oil-resistant rubber gaskets in grooves. The annular space between the condenser body and the porcelain is filled with transformer oil. A gas-filled expansion space is left at the top. For GOB bushings without oil level gauge the oil level can be checked by means of a dipstick in the oil filling hole. The lower end is shielded by an epoxy resin insulated aluminium shield. The inner terminal is attached to the centre tube by means of a through-going resilient pin which becomes locked when the outer terminal is screwed on. The design with this special resilient pin has been patented by ABB, and the pin ensures effective electrical contact between the inner and outer terminals. The inner terminal can be chosen for connection to leads either by brazing or crimping. The outer terminal is available in aluminium or copper alloy and can be supplemented by terminal plates of corresponding material. The upper insulator is made in one piece of high quality electrical porcelain. The mounting flange is manufactured of corrosion-resistant aluminium alloy. The mounting flange, the top housing and the top washer are protected by painting with a two-component primer and a grey-blue finishing coat of paint. The standard colour is Munsell 5.5B 55/1.25, environmental class C3. The bushings are delivered oil-filled and ready for use. If the bushing is mounted with an inclination of more than 45 from the vertical, special measures may have to be taken to ensure sufficient filling of oil in the bushing. Further information can be obtained on request. Outer terminal stud Oil filling holes with sealing plug Expansion space Oil Porcelain insulator air side Test tap Mounting flange Flange extension Porcelain insulator oil side Condenser body Insulated shield Top washer Top housing Top housing Prism glass Oil filling holes with sealing plug Fig. 1. Transformer bushing type GOB According to IEC 815 the creepage factor C.F. is <3.2 and the profile factor P.F. is >1.1. For special customer demands regarding creepage distance, other shed forms may be used. Shed form The shed form for all GOB bushings is of the anti-fog type with alternating long and short sheds. For each pair of sheds the ratio between nominal creepage distance and the axial length is 3.43 and the ratio between protected and nominal creepage distance is Fig. 2. Shed form 4

42 Test tap The outer conducting layer of the condenser body is connected to an insulated test tap on the flange. During operation the test tap cover must be screwed on, in order to earth the outer layer to the flange. The max. test voltage of the tap is 2 kv, 50 Hz for 1 minute. Max. service voltage is 600 V. goh_0010 Testing During the manufacture and on its completion the bushing is subjected to a number of routine tests. A tightness test is carried out on the assembled bushing after the final drying and impregnation. The test is made with an oil overpressure of 180 kpa (1.8 bar) for 12 hours at ambient temperature. No sign of leakage is allowed. Each bushing is subjected to a final electrical routine test. The test is made at room temperature with the bushing submerged in oil. Capacitance and tan d are measured in steps up to the power frequency withstand voltage, which is maintained for one minute. Capacitance and tan d are also measured at decreasing voltage at the same voltage levels as before the one minute test. Measurements for detection of internal partial discharge (PD measurements) are also made. These measurements are carried out at the same time as the power frequency withstand test. PD measurements are made in steps up to the full test voltage and down. It is always demonstrated that the PD value is max. 5 pc at test voltage equal to the rated system voltage. Fig. 3. Test tap Type tests have been carried out according to IEC 137 and IEEE. Type test reports are available on request. Test tap adapter For testing, a special test adapter is required for permanent connection of the test tap to the measuring circuits. Fig. 4. Test tap adapter, D. goh_0011 Common specifications Application: Transformers Classification: Oil impregnated paper, capacitance graded, outdoor-immersed bushing Ambient temperature: +40 to -40 C, minimum value as per temperature class 2 of IEC 137 Altitude of site: < m Level of rain and humidity: 1-2 mm rain/min horizontally and vertically, as per IEC 60-1 Pollution level: According to specified creepage distance and IEC Type of immersion medium: Transformer oil. Maximum daily mean oil temperature 90 C. Maximum temporary oil temperature 115 C Oil level below bushing flange: Maximum 30 mm Max. pressure of medium: 100 kpa overpressure Markings: Conforming to IEC/ IEEE 1) IEC 815 "Guide for selection of insulators with respect to polluted conditions." 5

43 Dimensions Bushings without oil level gauge Draw lead length = Fig Top design Fig. 5.3 Top design n1 Holes D = 16 Fig GOB design Fig ) The bushings can be provided with a longer shield L mm, in which case dimensions L, L1 and L5 also increase by 50 mm. Space for current Top Rated trans- Net design Dimensions in mm Type current former mass acc. to GOB A Cat. No. mm kg Fig. 5. L 1 ) L1 1 ) L2 L3 L4 L5 1 ) L6 L7 L8 L9 1 ) LF LF LF LF LF LF LF LF LF LF

44 Electrical data Rating Routine test Design data Nominal capacitances between conductor and test tap Rated Phase-to- Dry Wet power Dry C1 ±10 % [pf] voltage earth voltage lightning frequency 1 min. dry switching Space for current transformer Type U R U Y impulse AC 50 Hz impulse GOB kv, RMS kv, RMS kv, peak kv, RMS kv, RMS kv, peak Wet power frequency values apply to both IEC and ANSI requirements. Dimensions are subject to modification without notice. Cantilever load Max. permitted Creeepage distance loading perpendicular 60 s total protected to the terminal Test D1 D2 D3 D4 D5 D6 D7 D8 D10 n1 R1 R2 T mm mm N N ± ± ± ± ± ± ± ± ± ±

45 Dimensions Bushings with oil level gauge Draw lead length = Fig Top design Fig. 6.3 Top design n1 Holes D = 16 Fig GOB design. Fig ) The bushings can be provided with a longer shield L mm, in which case dimensions L, L1 and L5 also increase by 50 mm. Space for current Top Rated trans- Net design Dimensions in mm Type current former mass acc. to GOB A Cat. No. mm kg Fig. 6. L 1 ) L1 1 ) L2 L3 L4 L5 1 ) L6 L7 L8 L9 1 ) LF LF LF LF LF LF LF LF LF LF

46 Electrical data Rating Routine test Design data Nominal capacitances between conductor and test tap Rated Phase-to- Dry Wet power Dry C1 ±10 % [pf] voltage earth voltage lightning frequency 1 min. dry switching Space for current transformer Type U R U Y impulse AC 50 Hz impulse GOB kv, RMS kv, RMS kv, peak kv, RMS kv, RMS kv, peak Wet power frequency values apply to both IEC and ANSI requirements. Dimensions are subject to modification without notice. Cantilever load Max. permitted Creepage distance loading perpendicular 60 s total protected to the terminal Test D1 D2 D3 D4 D5 D6 D7 D8 D10 n1 R1 R2 T mm mm N N ± ± ± ± ± ± ± ± ± ±

47 Connection details Inner terminal Stud made of copper for connection of draw lead. The inner terminal must be provided with an outer terminal. For crimping, hexagonal or other symmetrical dies shall be used. Pressure 200 kn. Material and Conductor Dimensions (mm) Mass design area mm² Cat. No. D1 D2 L kg Copper 50 LF M 11 14,5 35 0,3 for crimping 70 -N ,3 or brazing 95 -L ,3 Copper < 150 LF S ,3 for brazing undrilled -U ,3 only < 285 -T ,6 undrilled -V ,6 Fig. 7. Inner terminal. Solid rod conductor The rod is produced from electrolytic copper and is divided into two parts. For the 800 A conductor the two parts are held together by a centre bolt with a resilient locking pin. For the 1250 A conductor the two parts are connected by counter-sunk screws. The lower part of the solid rod is designed to enable connection by brazing. The solid rod conductor can be divided either: Alt. 1: 20 mm below the bushing flange, or Alt. 2: 20 mm below the upper end of the bottom porcelain. The solid rod conductor must be provided with an outer terminal. Rated current 800 A LF Fig. 8. Solid rod conductor. Rated current 1250 A LF Outer terminal assembly Stud made of copper or aluminium with O-ring and locking pin. Other types can be provided on request. For bushings Dimensions (mm) Mass with D2 Material Cat. No. D L N kg mm Aluminium LF A B Copper LF A alloy -B Width across flats N Fig. 9. Outer terminal assembly. 10

48 Separate terminal plate with bolts The separate terminal plate is used for connecting the bushing to the line conductor. Material Cat. No. Aluminium LF A Copper alloy LF A Fig. 10. Separate terminal plate with bolts. Arcing horns Arcing horns of galvanised steel can be mounted on the bushing. The lower rod is fastened onto the flange with one of the fixing screws and the upper rod by means of a bracket on the outer terminal. The gap distances for standard arcing horns are shown in the table. Other gap distances on request. Bushing K C H type mm mm mm GOB GOB GOB GOB GOB GOB GOB Fig. 11. Gap distances. Conductor loading The rated currents listed in this catalogue are the standardised values according to IEC 137 (1995) which, with the largest possible conductor, fulfil the temperature rise test. The GOB bushings fulfil the temperature rise test requirements according to IEC 137 (1995) and IEEE C : Rated current Permissible current of bushing IEC IEEE A Conductor A A 800 Solid rod LF Solid rod LF , 1250 Stranded cable 50 mm , 1250 Stranded cable 70 mm , 1250 Stranded cable 95 mm , 1250 Stranded cable 150 mm Stranded cable 185 mm Stranded cable 285 mm Overloading of bushings If the conductor for the bushing is selected with 120 % of the rated current of the transformer, the bushing is considered to be able to withstand the overload conditions stated in IEC 354 without further clarifications or tests, according to IEC 137. Short-time current The rated thermal short-time current (I th ) is calculated according to IEC 137 (1995). For draw-lead of stranded copper values are given for 100mm 2. For other areas the short-time current is directly proportional to the area. Rated Short-time current (I th ) Dynamic current Area 1s 2s current (I d ) Conductor A mm 2 ka, RMS ka, RMS ka, peak Solid rod Solid rod Stranded draw-lead

49 Ordering particulars Bushings without oil level gauge When ordering, please state: Type and Catalogue number for bushings. Catalogue number for inner and outer terminal assembly. Additional accessories or modifications. Test required, in addition to the normal routine tests. Test tap adapter, if required. Note: The Cat. No. should have one of the following letters added to it, to indicate the type of insulator and oil end shield: K Normal oil end shield, brown porcelain L Normal oil end shield, light grey porcelain M Longer oil end shield, brown porcelain N Longer oil end shield, light grey porcelain Oil end shield Bushings Connection details Inner terminal stud: Cat. No. LF 170 Space for Bushing Rated current tube For crimping or brazing For brazing Type current transformer (See fig.) Conductor area Conductor area Undrilled with GOB A Cat. No. mm D2, mm 50 mm 2 70 mm 2 95 mm 2 <150 mm 2 <285 mm 2 pilot hole LF M 010-N 010-L 011-S 011-U LF T 011-V LF M 010-N 010-L 011-S 011-U LF M 010-N 010-L 011-S 011-U LF T 011-V LF M 010-N 010-L 011-S 011-U LF M 010-N 010-L 011-S 011-U LF T 011-V LF T 011-V LF T 011-V

50 LF A LF A Outer terminal assembly: Cat. No. LF 170 Stud with O-ring Separate terminal Solid rod conductor Arcing and locking pin plate with bolts Cat. No. LF 170 horns Cat. No. Aluminium Copper alloy Aluminium Copper alloy Alt. 1 Alt. 2 Mass kg LF A 002-A 014-A 021-A 019 -A A -D 019 -B 3.3 -A -E -C 4.2 -B 001-B 002-B 014-A 021-A 052 -A A -D 052 -B 8.4 -A -E -C B 001-A 002-A 014-A 021-A 019 -F A -K 019 -G 3.9 -A -L -H 4.7 -B 001-A 002-A 014-A 021-A 019 -M A -R 019 -N 4.2 -A -S -P 5.0 -B 001-B 002-B 014-A 021-A 052 -V B -Z 052 -X B -AA -Y B 001-A 002-A 014-A 021-A 019 -BL B -BM 019 -BN 4.7 -B -BP -BR 5.5 -C 001-A 002-A 014-A 021-A 019 -T B -X 019 -U 5.7 -C -Y -V 6.3 -C 001-B 002-B 014-A 021-A 052 -AM B -AN 052 -AP C -AR -AS C 001-B 002-B 014-A 021-A 052 -F A -K 052 -G B -L -H B 001-B 002-B 014-A 021-A 052 -M B -R 052 -N E -S -P E 13

51 Ordering particulars Bushings with oil level gauge When ordering, please state: Type and Catalogue number for bushings. Catalogue number for inner and outer terminal assembly. Additional accessories or modifications. Test required, in addition to the normal routine tests. Test tap adapter, if required. Note: The Cat. No. should have one of the following letters added to it, to indicate the type of insulator and oil end shield: K Normal oil end shield, brown porcelain L Normal oil end shield, light grey porcelain M Longer oil end shield, brown porcelain N Longer oil end shield, light grey porcelain Oil end shield Bushings Connection details Inner terminal stud: Cat. No. LF 170 Space for Bushing Rated current tube For crimping or brazing For brazing Type current transformer (See fig.) Conductor area Conductor area Undrilled with GOB A Cat. No. mm D2, mm 50 mm 2 70 mm 2 95 mm 2 <150 mm 2 <285 mm 2 pilot hole LF M 010-N 010-L 011-S 011-U LF T 011-V LF M 010-N 010-L 011-S 011-U LF M 010-N 010-L 011-S 011-U LF T 011-V LF M 010-N 010-L 011-S 011-U LF M 010-N 010-L 011-S 011-U LF T 011-V LF T 011-V LF T 011-V

52 LF A LF A Outer terminal assembly: Cat. No. LF 170 Stud with O-ring Separate terminal Solid rod conductor Arcing and locking pin plate with bolts Cat. No. LF 170 horns Cat. No. Aluminium Copper alloy Aluminium Copper alloy Alt. 1 Alt. 2 Mass kg LF A 002-A 014-A 021-A 019 -AM B -AS 019 -AT 3.7 -B -BB -BC 4.3 -B 001-B 002-B 014-A 021-A 052 -BC B -BF 052 -BD 9.3 -B -BG -BE B 001-A 002-A 014-A 021-A 019 -AN B -AU 019 -AV 4.3 -B -BD -BE 4.8 -B 001-A 002-A 014-A 021-A 019 -AP B -AX 019 -AY 4.6 -B -BF -BG 5.1 -B 001-B 002-B 014-A 021-A 052 -BK B -BN 052 -BL B -BP -BM B 001-A 002-A 014-A 021-A 019 -BS C -BT 019 -BU 5.1 -C -BV -BX 5.6 -C 001-A 002-A 014-A 021-A 019 -AR C -AZ 019 -BA 5.8 -C -BH -BK 6.4 -C 001-B 002-B 014-A 021-A 052 -AT C -AU 052 -AX C -AV -AY C 001-B 002-B 014-A 021-A 052 -AD B -AE 052 -AF B -AG -AH B 001-B 002-B 014-A 021-A 052 -AZ F -BA 052 -BB F -AK -AL F 15

53 Recommendations for positioning The maximum stresses in the oil at the surface of the shield insulation must be limited to those values normal for insulated conductors and similar components in the same transformer. The adjacent recommendations are intended as guide lines when complete calculations are not carried out. Type Internal R GOB insulation level (mm) of transformer (kv) 250/ Earthed layer Distance to uninsulated detail Distance to flat surface e.g. tank or core clamp 250/ / / / / / / / / ABB Components GOB 250 Ludvika, Sweden LF K No Ur/Uy 52/52 kv Ir 800 A 50/60 Hz LI / AC 250/120 kv M 23 kg L 240 mm 0-90 C1 128 pf Tan d 0.33 % C2 80 pf Tan d 0.45 % Nameplate with marking example. 16

54 1ZVN A 4 Cooling Equipment Ref to 1ZVN C_Operation Manual

55 Transformer Cooling Fans FE063 DB-TR GB

56 Transformer Cooling Fans Ziehl-Abegg Transformer Cooling Fans with in the impeller hub integrated external rotor motor are constructed in a way to form an integral unit. Motor Protection IP54 in conformity with DIN VDE 0470 part 1 (EN ) categorie 2 Balancing Quality G 6.3 acc. to ISO 1940 part 1 Installation position The fans are suitable for all installation positions. Condensation drain holes The lower of the condensation drain holes K must be open depending on whether mounting position Vo (rotor above) is used. With mounting position H, the condensate can escape via the gap between stator and rotor. Bearings Ball bearings closed on both sides with special grease temperature range -40 to +180 C Contact Protection Wire screen on the suction side according to the safety regulations (DIN EN 294) Corrosion Protection External rotor motor, terminal box and blades made of die cast aluminium. Fan housing made of hot galvanized sheet steel (DIN EN ). Additional KTL-coated. Wire screen is galvanized, yellow chromated and electrostatic powder coated in RAL Mounting components made of stainless steel. The fan is double coated (RAL 9006). Upon request all components completely triple coated is available also. If a fan is stationary for long periods in a humid atmosphere, it should be switched ON for minimum of two hours every month to remove any moisture that may have condensed within the motor. Dimension sheet K Mounting position Vo (shaft vertical / rotor above) L-KL-2323/1 Mounting position H (shaft horizontal) L-KL-2323 direction of air flow terminal box guard grille L-KL DB-TR-007 Transformer Cooling Fans FE063

57 Transformer Cooling Fans Voltage / Frequency 3~ two-speed 400 V ± 10 % D/Y, 50 Hz 3~ two-speed 460 V ± 10 % D/Y, 60 Hz Insulation class F acc. to DIN EN (IEC34-1) Motor protection The motors are equipped with thermal contacts. This provides reliable protection for motors 1. that are speed-controlled, 2. that are intermittently or continously exposed to increased ambient temperatures, 3. that have a high switching rate, 4. that have become jammed or 5. whose cooling has been changed Motor protection commonly used with a bimetal tripping devices offers only over current protection. The measurement of the temperature in a motor using a bimetall device current sensor is not adequate or accurate. Thermal contacts are temperature sensing, switching elements built directly into the windings of our external rotor motors. They interrupt an electrical contact as soon as the maximum admissible sustained temperature has been reached. Breaking capacity: 6 A with cos phi 0,6 Rated Voltage: 250 V - Dielectric strength: 2000 V eff. Thermal contacts have to be integrated into the control circuit in a way as to avoid any automatic switching on in emergencies after cooling down. Common protection of several motors is possible via a protection device.in order to do this, the thermal contacts of the individual motors have to be connected in series. Please pay attention to the fact that all motors are disconnected at the same time in case of a temperature failure at one single motor. In practice, however, motors are grouped in order to be able to run with reduced power in the emergency operation in case the motor fails. Connection diagrams 108 XB 3~ motor with two speeds by changing D/Y and thermal contacts D = high speed Y = low speed U1 U2 V1 V2 W1 W2 Colours brown red blue grey black orange Terminal box The terminal box K07 is made of die cast aluminium and is fitted onto the stator flange. Cable entry for connecting line: diameter 7-14 mm. PG16 cable gland possible. FE063 D-connection Y-connection Take note of name plate data! 108XB Noise level data The suction side A-weighted sound power levels L WA are indicated throughout in the catalog. Simple relations can be used to derive the pressure side or the overall sound power level in addition from the values indicated. The sound measurements are based on the enveloping measurement surface procedure as described in DIN and/or ISO 3744, Part 1 (Precision Class 2). In addition to this, the sound pressure level L p of the individual third octave bands are measured at 8 points on the surface of the enveloping measurement (Fig. Ia - Fig. Ib). First the sound power levels of the third octave bands, and then the suction-side sound power level L W is calculated from the measured sound pressure levels of the third octave bands. The fans are installed to the acoustic chamber in a free inlet / free outlet situation. The measurements take place without any additional accessories such as guard grilles. The measurement devices that are used comply with DIN Class 1. The A-weighting generally takes the frequency dependent sensitivity of the human ear into account by applying different weighting factors to the individual sound power third octave bands. The A-weighted sound power level is the common property for evaluating the noise behavior of technical devices. Calculating the pressure-side sound power level and the overall sound power level The pressure side sound power level is approximatly the same as the suction side level for axial fans. Thus the overall sound power level (superposition of suction and pressure side, see DIN Part 1 Appendix F) is obtained by adding 3dB to the suction side sound power level. DB-TR-007 Transformer Cooling Fans FE063 3

58 Transformer Cooling Fans Noise level data L-KL-1668/1 Fig.Ia: Position of microphones to Axial fan Determining the overall sound power level when several sources of sound are at work simultaneously Just as the overall sound power level was calculated as a result of the pressure and suction side sound power levels (illustrated), the overall sound power level of several individual sound sources super-imposed is determined by adding the individual sound power levels as defined by DIN Part 1 Appendix F. This relationship forms the basis for the diagrams in Figures II and III. To add several sound sources of the same level, the overall level can be taken directly from the diagram in Fig. II. The combined effect of 6 identical sound sources, for example, results in an overall sound level that is about 8 db higher. The overall sound power level of two sound sources with different levels can be taken from the diagram in Fig. III. Two sound sources whose sound power levels differ by 4 db, for example, result in an overall sound power level that is about 1.5 db higher than the larger one of the two sound sources. Addition to sound level 15 db Fig. II: Addition to sound level Number of sound sources of the same level L-KL-1060/2 db 2 Addition of several sound sources db 24 Difference in level of two sound sources L-KL-1060/3 Fig.Ib: Position of microphones L-KL-1863/2 Determining the sound pressure level Based on rooms with an average sound absorption capability, the A-weighted sound pressure level L pa at a distance of 1 m from the axis of the fan is calculated by subtracting 7 db from the A sound power level L WA. This assumption is applicable in most situations will sufficient accuracy. The noise behavior can, however, be sharply influenced by individual installation situations. The decline in the sound pressure level as a function of distance in a partially reflecting environment is illustrated in Figure IV. Fig. III: Sound sources of different level Reduction of sound pressure level 0 db m 100 Distance Fig IV: Reduction of sound pressure level with distance L-KL-1060/1 4 DB-TR-007 Transformer Cooling Fans FE063

59 Transformer Cooling Fans FE063-SDL Type Frequency Article no. FE063-SDL.4I.3 50 / 60 Hz FE063-SDL.4I.3 50 / 60 Hz Performance data Freq. Voltage Poles Fan Air- Fan Nominal Suction side Starting Type Article speed volume speed input sound power Current number free- free- nominal power level blowing blowing Hz V rpm m 3/ s rpm KW db(a) A 50 3~400V ±10% D ,3 FE063-SDL.4I ~400V ±10% Y , ,4 69 1,4 FE063-SDL.4I ~230 V ±10% D , ,4 69 2,4 FE063-SDL.4I ~415V ±10% D , 677 3,6FE063-SDL.4I ~415V ±10% Y , ,4 69 1,2 FE063-SDL.4I ~230V ±10% D , ,4 69 2,1 FE063-SDL.4I ~460 V ±10% D , , ,3 FE063-SDL.4I ~460 V ±10% Y , , ,4 FE063-SDL.4I ~265 V ±10% D , ,8669 2,4 FE063-SDL.4I ~460 V ±10 % D , ,6FE063-SDL.4I ~460 V ±10 % Y , ,5 69 1,2 FE063-SDL.4I ~265 V ±10 % D , ,5 69 2,1 FE063-SDL.4I ) Fans with asynchronous external rotor motor can be operated at any altitude above the sea level within the rated voltage and frequency range. Performance data refer to free discharge conditions (zero back pressure), with guard grille on suction side, installation type A according to DIN part 2 (ISO 5801). Performance reduction due to a second guard grille at pressure side is approx. 4% to 7%. DB-TR-007 Transformer Cooling Fans FE063 5

60 Accessories Fixing devices Horizontal air flow Vertical air flow Fig Fig. 4a Fig. 4b L-KL-2246 Fig. 3 Fig. 5 L-KL-2247 Fig. 6 Air flow Fixing device Mounting of fan Radiators Dimension c Order no. Horizontal Fig. 2 Fig Vertical Fig. 4a Fig Vertical Fig. 4a Fig Vertical Fig. 4b Fig Vertical Fig. 4b Fig Fixing devices for mounting the fan to the radiator. Made of stainless steel Guard Grille Ziehl-Abegg AG Heinz-Ziehl-Straße D Künzelsau Telefon ++49 (0) 7940 / 16-0 Telefax ++49 (0) 7940 / info@ziehl-abegg.de L-KL-2258/4 Guard grille on pressure side 1) Article no galvanized according to DIN and additional plastic coated RAL ) see notes on Performance data page 5 DB-TR-007- Transformer Cooling Fans FE063-01/02

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66 1ZVN A 5 Current Transformer

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70 1ZVN A 6 Other Accessories 6.1 Pressure Relay 6.2 Pressure relief valve 6.3 Winding temperature indicator 6.4 Oil temperature indicator 6.5 Oil level indicator 6.6 Bucholz Relay 6.7 Dehydrating breather 6.8 Rapid Pressure Rise Relay

71 Pressure relay for on-load tap-changers Technical information

72 Switching contact - micro switch ABB Components Pr 22.5 ~35 ~200 Adjusting nut Spring Piston 110 ;; ;; Connection for test equipment Two single-pole switching contacts One single-pole switching contact ~ General description Protection for the on-load tap-changer is provided by a pressure relay which is mounted on the tap-changer oil compartment. In the event of an overpressure in the tap-changer oil compartment, the pressure relay will trip the transformer main circuit breakers. Design The pressure relay is mounted on a three-way valve. On the other two outlets of the valve there is a connection flange on one side, and a connection for test equipment on the other, see fig. The relay is made of copper-free aluminium alloy and is externally coated with an enamel. A stainless steel model can be provided on request. Degree of protection IP66. The function pressure (set point) has been set by the manufacturer in accordance to the requirements for each application. The electrical connection shall be made to the terminal block mounted onto the pressure relay. The pressure relay is designed for one or two switching elements (micro-switches). The micro-switch is hermetically sealed and filled with nitrogen with over-pressure, and separated from the connection space with a sealed cap. Breaking capacity Withstand voltage Voltage Resistive Inductive between open load load contacts Operation NO NC C NO NC C NO NC C When the pressure acting on the face of the piston exceeds the spring load of the piston, the piston will move and activate the switching element. See fig. The function time is less than 15 ms in the temperature range of -40 C to +80 C, with a pressure increase of MPa/sec. The function time is the time from the pressure in the on-load tapchanger oil compartment exceeds the adjusted set point of the pressure relay until the pressure relay gives a stable signal for operating the main circuit breakers. Function pressure The value of the adjusted function pressure (set point) depends on the distance (H) between the pressure relay and the oil level in the oil conservator. Further information in the Technical, Installation & Commissioning, Maintenance and Repair Guides for each type of on-load tapchanger. Mounting details The following parts are supplied together with the pressure relay: studs M10x40 (4x), nuts M10 (4x), washers 10x22x2 (4x) and O-ring 44.2x55.6 (1x). 110 V DC 0.8 A 0.2 A L < 40 ms R 125 V DC 0.6 A 0.15 A L < 40 ms R 220 V DC 0.4 A 0.1 A L < 40 ms R 125 V AC 5 A 5 A cos ϕ V AC 2.5 A 2.5 A cos ϕ 0.4 Table 1. Technical data - Micro-switch ABB Components AB SE Ludvika, SWEDEN Tel , Fax sales@se.abb.com 2 kv, 50 Hz, 1 min Printed in Sweden by Globe, Ludvika, 2000 Distance H Type of OLTC Function pressure in metres (set point) H < 4 UZ 50 kpa (7 psi) 4 H < 7 UZ 100 kpa (14 psi) H < 7 UB, UC 100 kpa (14 psi) 7 H < 10 UZ, UB, UC 150 kpa (21 psi) 10 H < 14 UB, UC 200 kpa (28 psi) Table 2. Function pressure Manufacturer: BETA B.V., Rijswijk, The Netherlands 1ZSE en, Rev. 3,

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77 ABB TRANSFORMERS LTD. Km 9, National High Way 1A, Thanh tri, Hanoi, Vietnam Telephone : Fax : OIL AND WINDING TEMPERATURE INDICATOR SERIES 34 & METHOD FOR MEASURING Page 1 of 15

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82 ABB TRANSFORMERS LTD. Km 9, National High Way 1A, Thanh tri, Hanoi, Vietnam Telephone : Fax : INSTRUCTION Page 6 of 15

83 ABB TRANSFORMERS LTD. Km 9, National High Way 1A, Thanh tri, Hanoi, Vietnam Telephone : Fax : ELECTRICAL CIRCUIT 4.1. ELECTRICAL CIRCUIT FOR OIL TEMPERATURE INDICATOR Page 7 of 15

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85 ABB TRANSFORMERS LTD. Km 9, National High Way 1A, Thanh tri, Hanoi, Vietnam Telephone : Fax : ELECTRICAL CIRCUIT LAST VERSION OVERVIEW Page 9 of 15

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87 ABB TRANSFORMERS LTD. Km 9, National High Way 1A, Thanh tri, Hanoi, Vietnam Telephone : Fax : DIMENSION DRAWINGS AND CONTACT RATING 6.1. DIMENSION DRAWINGS Page 11 of 15

88 ABB TRANSFORMERS LTD. Km 9, National High Way 1A, Thanh tri, Hanoi, Vietnam Telephone : Fax : TECHNICAL DATA FOR SWITCHES Page 12 of 15

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103 ABB LTD. Km 9, National High Way 1A, Hoang Mai, Hanoi, Vietnam Telephone : Fax : DEHYDRATING AIR BREATHER Dimension Drawings Page 1 of 6

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115 1ZVN A 7 Drawings 7.1 Mechanical Drawings 7.2 Control Drawings

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