MEDIUM VOLTAGE SWITCHING DEVICE. Vacuum circuit-breaker 17,5 kv (> 2500 A / 50 ka) Installation Operation Maintenance

Transcription

1 0 MEDIUM VOLTAGE SWITCHING DEVICE HVX Vacuum circuit-breaker 17,5 kv (> 2500 A / 50 ka) Installation Operation Maintenance HVX No. AGS Edition 06/07 Technical instruction AREVA T&D

2 AREVA T&D T&D Worldwide Contact Centre (0) Manufacturer: AREVA Energietechnik GmbH Sachsenwerk Medium Voltage Rathenaustraße 2 D Regensburg +49 (0)9 41/ (0)9 41/ Service: Should you have any queries as to our service, please contact: AREVA Energietechnik GmbH Sachsenwerk Medium Voltage Service-Center D Regensburg +49 (0)9 41/ (0)9 41/ AREVA Energietechnik GmbH, Sachsenwerk Medium Voltage All rights reserved to this technical instruction. Reproduction and making available of this technical instruction, or extracts, to third parties are prohibited. Only integral reproduction of this technical instruction is permitted with the written permission from AREVA Energietechnik GmbH, Sachsenwerk Medium Voltage. Electronic copies in e.g. PDF-format or scanned version have the status for information only. The only valid version of technical Instructions are always enclosed directly to the product in question by the factory.

3 Content 1 Regulations and Provisions Remarks on this Technical Instruction Terms and symbols used Use in line with the intended purpose Applied standards Safety provisions Disposal after the end of service life 5 2 Variants 6 3 Technical data Type designation Technical data Control and operating devices 9 4 Shipping instructions Packaging Delivery Storage Transport 11 5 Assembly Instructions for assembly HVX-F Mechanical assembly HVX-E Mechanical assembly Connecting the control lines 15 6 Commissioning HVX-E (withdrawable unit) HVX-F (fixed type) 17 7 Operation Control elements and operator interface Interlocks Charging the energy storing device Switching the circuit breaker Actuate withdrawable part 21 8 Servicing Safety Servicing schedule Cleaning insulating components Corrosion protection Avoid condensation Lubrication instructions Maximum admissible number of breaking operations of the vacuum chambers 27 9 Annex Accessories Auxiliary products Screw fastenings How to treat the contact surfaces 29 3

4 1 Regulations and Provisions 1.1 Remarks on this Technical Instruction This Technical Instruction describes transport, assembly, operation, handling and maintenance of the series HVX vacuum circuit breakers. It must be stored so that it is at any time readily accessible and can be used by persons who work on the circuit-breaker or the switchgear with this circuit-breaker. When re-selling the circuit-breaker or the switchgear with circuit-breaker, make sure that this Technical Instruction is transmitted as well. The following additional documents must be observed for this circuitbreaker: Purchase agreement containing the stipulations on the specific equipment of the circuit-breaker and the legal details. The contract specific circuit breaker wiring diagram / documentation Project notes regarding the HVX circuit breaker For assembly and operation of the circuit-breaker, the operating manual of the switchgear in which it is operated must be complied with. As our products are subject to continuous further development, we reserve the right to changes regarding standards, illustrations and technical data. All dimensions not specified in detail are in millimeters. 1.2 Terms and symbols used This Technical Instruction uses certain terms and symbols. They warn about dangers or provide important information which must be complied with at all costs so as to avoid danger and damage: Warning This warning symbol indicates dangerous electrical voltage. Contact with voltage may result in fatal injury! Warning This warning symbol indicates danger of injury. Observe alle instructions that are labeled with this sign to avoid death or serious injury. Important This notice symbol is used for information which is important to avoid damage. 1.3 Use in line with the intended purpose The HVX vacuum circuit-breaker is intended exclusively as a switching unit in air-insulated medium-voltage switchgear. It may only be used in the scope of the specified standards and the switchgear-specific technical data. Any other use constitutes improper use and may result in dangers and damage. Operating reliability and service life depend on correct operation. Disclaimer of liability The manufacturer shall not be held responsible for damage which occurs if instructions in this Technical Instruction are not complied with, the circuit-breaker is not operated according to its intended use (see above), the circuit-breaker is assembled, connected or operated improperly, accessories or spare parts are used which have not been approved by the manufacturer, the circuit-breaker is converted without the manufacturer's approval, or if inadmissible parts are attached. 4

5 1.4 Applied standards The three-pole HVX vacuum circuitbreaker corresponds to the requirements for AC switchgear for voltages above 1 kv acc. to IEC ; complies, regarding its switching capacity and insulating level, ANSI C37... (please enquire at the manufacturer's) corresponds, as a withdrawable unit, to IEC Type approval of vacuum interrupter chambers acc. to. RöV The vacuum interrupter chambers have been approved by the X-Ray Ordinance (RöV) of the Federal Republic of Germany up to a maximum voltage amounting to the rated shorttime power-frequency voltage (rated power frequency withstand voltage) defined by DIN VDE/IEC. Thus, they satisfy the conditions for operation exempt of approval up to the voltage in question according to the X-Ray Ordinance (RöV). Environmental and operating conditions HVX circuit-breakers may only be operated under normal operating conditions acc. to IEC Operation under conditions deviating from these is only admissible upon consultation and with the written approval of the manufacturer. Ambient conditions Temperature class "minus 5 indoors" 1) Ambient temperature min./max. Average value over 24 hours (max.) Max. installation altitude above sea level 1) higher values on request -5 / 40 o C 1) 35 o C 1) 1000 m 1) 1.5 Safety provisions The work described in this Technical Instruction may only be performed by specialist electricians who have proved their experience with the HVX circuit-breaker and all relevant Safety provisions. Applicable standards and regulations: The locally applicable accident prevention, operating and work instructions must be complied with. Installation 2) : IEC / HD 637 S1 Operation of electrical equipment 2) : EN ) The national standards applicable in the country where the equipment is to be installed must be complied with. Read these instructions carefully before you work on the circuit-breaker, and perform the work detailed in it according to the descriptions. Do not perform any work on the circuitbreaker which is not described in this Technical Instruction. Warning! Before starting work on the circuit-breaker, deenergize the system, verify it for zero voltage and earth the system according to the applicable safety rules pursuant to EN Warning! Before performing work on the circuit-breaker, switch off the supply voltage and prevent it from reclosing. Warning! There is a risk of injury when working on the drive mechanism. Before commencing work, release the energy-storing device by performing the operating sequence OFF-ON-OFF and remount the drive s transport securing device (see Chapter 6). 1.6 Disposal after the end of service life A manual on disposal after the end of the service life is available for disposal of the HVX vacuum circuit breaker. Disposal at the end of the service life is performed as a service by the Service Center at the manufacturer's which is subject to a fee. Please contact the Service Center (see page 2). 5

6 2 Variants Fig. 2.1 Vacuum circuit breaker HVX-F fixed type 1 64-pole low-voltage terminal 2 Information plate for commissioning 3 User interface 4 Switch circuit-breaker ON 5 Switch circuit-breaker OFF 6 Handles (optional) 7 Nameplate 8 Position indicator of closing spring 9 Position indicator of circuit breaker 10 Insertion opening for manual charging of the closing spring 11 Operation counter 12 Press rod (transfer of ON/OFF switching movement) 13 Drive casing 14 Vacuum interrupter chamber 15 Conductor bar terminal 16 Pole partitions 6

7 Fig. 2.2 Vacuum circuit breaker HVX-E with withdrawable part for PIX switchgear panels Low-voltage terminal 2 Information plate for commissioning 3 User interface 4 Position indicator - withdrawable part in service position 5 Position indicator - withdrawable part in disconnected position 6 Lever for locking/unlocking the withdrawable part in the panel 7 Insertion opening for manual racking in/out the withdrawable part 8 Slide for opening the insertion opening (7) for manual racking the withdrawable part in and out manually 9 Withdrawable part s rollers 10 Withdrawable part 11 Press rod (transfer of ON/OFF switching movement) 12 Vacuum interrupter chamber 13 Moving contacts 14 Pole partitions Fig. 2.3 Vacuum circuit breaker HVX-E with withdrawable part for PIX high current switchgear panels 7

8 3 Technical data 3.1 Type designation The type designation on the nameplate (Fig. 2.1) specifies essential technical data. The type designation (1) is broken down in this example. Example HVX E Series HVX Rated voltage 12 kv Rated short-circuit breaking current 50 ka Rated normal current 1250 A F: fixed type E: Withdrawable unit The following data on the nameplate are relevant for replacement or in case of any queries: Type designation (1) Serial number (2) Year of construction (3) Fig. 2.1 Nameplate 1 Type designation 2 Serial number 3 Year of construction 4 Technical data 3.2 Technical data Rated voltage U r [kv] 12 17,5 Rated lightning impulse withstand voltage U p [kv] Rated power frequency withstand voltage U d [kv] Rated operating current I r max. [A] ) Rated cable-charging breaking current I c [A] 25 31,5 Rated short-circuit breaking current I sc max. [ka] 50 Rated short-time current I k max. [ka] 50 (3 s) Rated frequency f r [Hz] 50/60 1) Higher rated currents possible on request (with fan) 8

9 3.3 Control and operating devices The circuit breaker has been designed on principle so as to permit manual operation. The drive mechanisms of the individual switching devices can be equipped, depending on the specific customer's model, with additional electrical control and operating devices. These are defined in the circuit breaker-specific wiring diagram ( see separate documentation). Component fitting options: Motor for charging the energy-storing device (spiral spring) HVX-E: electric actuation of the withdrawable part Closing release 1 ea. Overview of rated supply voltages Direct voltage DC [V] Alternating voltage AC [V] (110) / 120 (220) / 230 Power consumption, solenoids and motor Solenoids/motor Power consumption [W] Closing release < 250 Opening release < 250 Undervoltage release 15 Secondary release 12 Motor for energy-storage device for withdrawable part 150 < 200 Information about the power consumption of solenoids and the motor is available from the manufacturer. The supply voltage data is required to this effect. Operating times for solenoids and motor Minimum command time "OFF" el. tripping [ms] 20 Minimum command time "ON" el. tripping [ms] 20 Motor charging time [s] 4 12 Opening release 3 ea. max. Secondary release (Transformer-operated release) 1 ea. max. Maximum equipment opening release and secondary release: 3 units in total Anti-pumping relay If an ON and OFF command is simultaneously and permanently present at the circuit-breaker, the latter returns to its initial position after closing. It remains in this initial position until the ON command is issued anew. This prevents continuous closing and opening ("pumping"). Undervoltage release (optional) 1 ea. Blocking coil Blocking coils prevent the circuit breaker from being closed and opened via the push-buttons "ON" or "OFF", as well as manual actuation of the withdrawable part. If the rated supply voltage has fallen or is shut off, all blocking coils are in "blocked" position. 9

10 Auxiliary switch Auxiliary switches are always actuated directly by the switch shaft via an intermediate linkage. Their position always corresponds to that of the main contacts. The switching functions have been set in the factory according to the circuit diagram. Technical data of auxiliary switches for circuit-breaker (3 x 8-pole) Rated supply voltage DC AC [V] < Switching capacity [A] 10 3, Time factor T=L/R [ms] Rated short-time current Rated continuous current 250 A / 3 s [A] 15 Auxiliary switch on the withdrawable part for PIX high current panels Other switching functions of the auxiliary switch can be set by adjustable cams (Fig. 2.2). The auxiliary switches may only be set by specialists who dispose of experience regarding the auxiliary switches installed. Auxiliary switches must not be disassembled. Nocken Cam Viewing Blickrichtung direction for adjustment für die Einstellung Fig. 2.2 Setting the cams of the auxiliary switch Technical data of auxiliary switches on the withdrawable part for PIX high current panels Rated supply voltage DC [V] AC Switching capacity [A] Time factor T=L/R [ms] < 20 Rated short-time current 100 A for a duration of 30 ms Rated continuous current [A] 10 10

11 4 Shipping instructions 4.1 Packaging As standard, the switching devices are packed in cardboard boxes and fastened on a pallet by means of two plastic straps. For sea transport, several cardboard boxes are additionally pakked in a closed crate (also in container transport). The crate is hot-sealed in aluminium foil with desiccant. 4.2 Delivery Handle shipping units carefully when unloading and unpacking them. Shipping units must be unpacked immediately after receipt. Any damage occurred in transit must be recorded and reported immediately to the manufacturer. On delivery, the consignment must be checked for completeness. The supplier must be notified in writing about any discrepancies. 4.4 Transport Transport using a forklift truck: Only transport the circuit-breaker on a pallet. Transport without pallet: Lift circuit-breaker acc. to Fig ropes (not metallic steel cables) Ø 12 to 15 mm or straps are required to this effect. Warning! Make sure the rope or strap is strong enough to bear the weight of the circuit-breaker. Type HVX Weight [kg] fixed type 230 withdrawable unit 330 (Guide values without packaging) HVX-E circuit-breakers with guide rollers on the withdrawable part (see also Fig. 5.4) must be placed on wooden bars or rails as shown in Fig. 4.1 in order not to damage the guide rollers. 4.3 Storage If the switching devices are not installed immediately upon delivery, they can be stored for max. 2 years if packed in hot-sealed aluminium foil with desiccant. The ambient conditions for storage must comply with the admissible operating conditions. Protect circuit breakers and accessories against condensation. Warning! Sufficient stability and evenness of the supporting area (floor) must be ensured. 20 Fig. 4.1 Lifting and depositing the HVX circuit-breaker 1 Guide rollers (only on the withdrawable part for PIX panels and for pole center spacing of 254) 2 Wooden bars or rails as base

12 5 Assembly 5.1 Instructions for assembly Warning! Observe the safety provisions of chapter 1.5. Warning! Risk of injuries. The energy storing device must not be charged until assembly is finished. Dimension drawings are made available on request. Check technical data on nameplate. Check supply voltage for the control and operating devices installed. The vacuum circuit-breakers HVX-F and HVX-E are delivered in completely assembled and ready-to-operate condition. They are supplied in position "OFF" and with the energy storing device "released". 5.2 HVX-F Mechanical assembly Screws and attachments are not included in the scope of supply. Fastening the circuit-breaker Warning! The frame being used must be suitable to bear the weight of the circuit-breaker (see Chapter 4). Dimensions and arrangement of fasteners: see dimension drawing. Comply with the specified tightening torques (refer to Annex). Make sure not to distort the circuitbreaker when screw-fastening it. Earth terminal Design and dimensioning of the circuit-breaker's earth terminal acc. to IEC Select the cross section of and the material used for the earth conductor according to HD 637 S1 or the appropriate national work instruction. Fig. 5.1 HVX-F Coat contact surfaces and comply with the specified tightening torques (refer to Annex). Connect earth line to the circuitbreaker housing (see dimension drawing). 12

13 Connecting conductor bars Aluminium conductor bars must not be connected to silver-plated connection areas of the circuit-breaker. Inadmissible matching of materials. Coat contact surfaces and comply with the specified tightening torques (refer to Annex). Take account of DIN and DIN regarding the dimensioning for continuous current. Maximum distance of the next support point from the circuitbreaker s terminals in the direction of the switch pole axis. 3 x the pole center spacing of the circuit-breaker (unless the next supporting point is located in the direction of the switch pole axis, make sure that the circuit-breaker pole is not exposed to higher electrodynamic forces). Screw-fasten conductor bar (take account of DIN ). The circuit-breaker must not be deformed by screw-fastening the conductor bars. Fig. 5.2 High-voltage terminal for the HVX-F on the circuit-breaker Silver-plated copper Connection areas on the conductor bar M 12 M12 Thread reach Einschraubtiefe mm mm Copper or silver-plated copper In case of aluminium: use an intermediate layer of copper (thickness 0.1 mm) corresponding to the full size of the connection area (reduction of rated normal current by 13 %) 13

14 5.3 HVX-E Mechanical assembly A transport truck (optional) is used to rack the circuit-breaker into the switchgear panel (Fig. 5.6). For the design and method of operation of the transport truck used, please refer to the instructions for the panel in question. Placing the circuit-breaker on transport truck and racking it into the switchgear When performing the following assembly steps, observe and comply with the instructions given for the panel used. Optionally, HVX withdrawable units and panels may be coded to match (Fig. 5.4). This is to prevent a withdrawable unit from being racked completely into the panel if the rated data do not match. 1. Check the ratings indicated on the nameplate between the HVX-E and the appropriate panel. 2. Place the circuit-breaker on the transport trolley rails. Fig. 5.3 Transport truck with HVX-E circuit-breaker in front of the panel Lock the circuit-breaker on the transport trolley. 4. Couple the transport trolley to the panel. 5. Unlock the circuit-breaker from the transport trolley and rack the circuit-breaker into the panel. HVX withdrawable units for PIX panels must latch into the lock rocker of the panels (Fig. 5.4). HVX withdrawable units for PIX High Current Panels are anchored in the panel by actuation of the withdrawable part interlock (Fig. 5.5). 6. Release the transport trolley from the panel. 2 1 Fig. 5.4 Bottom of a HVX-E circuit breaker for PIX switchgear panels 1 Spindle of the withdrawable part 2 Spindle nut of withdrawable part (must be latched in the cell) 3 Circuit-breaker coding 4 Guide rollers Fig. 5.5 Withdrawable part locking device in panel 14

15 Earth terminal The switching device potential is linked to the panel via the four wheels of the withdrawable part (Fig. 5.6). 5.4 Connecting the control lines The control lines are connected, depending on design, via control connectors (Fig. 5.9 and 5.10) or control lines to the terminal strips in the drive casing. The control lines are wired in the circuit-breaker up to the control connector or up to the terminal strip. Single-wire conductors or strands can be connected to terminal strip up to 2.5 mm Fig. 5.6 Equipotential bonding within the cell Optionally, the HVX-E circuit-breaker is available with short-circuit proof earthing (Fig. 5.7 und 5.8). 1 Fig Earth bar at the HVX-E for PIX switchgear panels 1 Fig Earth bar at the HVX-E for PIX high current switchgear panels in control connector up to 1.5 mm 2 Terminal with control connector Push the control connector onto the 64-(36-) pin right-angle plug-and socket connector of the circuit-breaker, and lock it (Fig. 5.9 und 5.10). Connector interlock in case of HVX-E: The control connector on the panel can only be inserted or removed while the circuit-breaker is in disconnected position. Connection to terminal strip 1. Remove the cover plate. 2. Connect external control lines via the terminal strip (Fig. 5.11). The valid wiring diagram has been enclosed with each circuit-breaker. If additional control lines are placed in the drive casing, leave a sufficient distance from the movable parts of the drive. 3. After connecting the external control line, mount the cover plate. Comply with the tightening torques specified for screw-fastening (refer to Annex). Fig. 5.9 Control connector, 64-pin 1 Insert control connector 2 Lock Fig Insertion of the control connector, 36-pin Fig Control connection on terminal strip 1 15

16 6 Commissioning Check circuit-breaker for external damage. Make sure that there are no external parts in the circuit-breaker compartment. Check surface of insulating components for impurities. If necessary, clean (see Chapter 8). Observe the operating and locking conditions (Chapter 7). The energy storing device of motorized circuit-breakers is charged automatically once the supply voltage is applied. Undervoltage releases (optional) enable switching tests only to be performed with the supply voltage applied. Remove transport protection Observe the warning and notification plates on the front cover and in the drive (Fig. 6.1). The circuit-breaker is equipped with a transport securing device in the drive (Fig. 6.1). Remove transport securing device before commissioning: 2 1. Remove front cover. 2. Remove transport securing device (red) by releasing the threadcutting screw M5 using a wrench of TORX-Nr. T25 (Fig. 5.2). Store the device for maintenance work. 3. Secure front cover again using the screws. Tightening torque: 4.7 Nm + 15 %. 1 3 Fig. 6.1 Remove transport securing device in the drive 1 Front cover 2 Transport protection 3 Label with instructions for commissioning 16

17 6.1 HVX-E (withdrawable unit) Perform functional tests: 1. Charge energy-storing device using the crank. Check the spring position indicator. 2. Switch circuit-breaker on and off several times by hand. Check position indicator. 3. Move the withdrawable part to its service and disconnected position via the crank handle. Check mechanical interlocks between the HVX-E and the cell. Check position indication. 4. Check electrical functions of control and operating devices. Apply supply voltage. 5. Actuate the releases to perform switching operations and check functions/interlocks. Watch position indicators. 6. Rack the circuit-breaker in and out via the motor-drive (optional). At the same time, check the position indicators and the interlocks in the circuit-breaker and with regard to other devices. 6.2 HVX-F (fixed type) Check assembly work: Check securing bolts. Check the conductor bars' screw couplings using a torque wrench. Check the screw coupling of the earth terminal. Perform functional tests: 1. Charge energy-storing device using the crank. Check the spring position indicator. 2. Switch circuit-breaker on and off several times by hand. Check position indicator. 3. Check electrical functions of control and operating devices. Apply supply voltage. 4. Actuate the releases to perform switching operations and check functions / interlocks. Watch position indicators. 5. Check interlocks between circuitbreaker and other devices. 17

18 7 Operation 7.1 Control elements and operator interface button (rocker O ) or pushbutton O to switch circuit breaker OFF (open) 0 l button (rocker I ) or pushbutton I to switch circuit breaker ON (close) Nameplate Sachsenwerk Type HVX NO SW U 24 kv Im 800 A / 50/60 Hz Um 125 kv Isc 16 ka /th 3 s 0-3min min-00 Operation counter Made in Germany Position indicator of circuit breaker Position indicator of closing spring HVX Insertion opening for charging the energy storing device Fig. 7.1 Operator interface of HVX circuit-breaker Fig. 7.2 Control elements for the circuit-breaker HVX-F 1 closed door of switchgear panel 2 ON/OFF operating rod 18 Fig. 7.3 Control elements for the circuit-breaker HVX-E in PIX switchgear panels 3 Spring charging crank for energy storing device 4 Moving crank handle for withdrawable part Fig. 7.4 Control elements for the circuit-breaker HVX-E in PIX high current switchgear panels

19 7.2 Interlocks Warning! You must be familiar with these interlocks before operating the circuit-breaker. Mechanical interlocks The HVX switch features basic interlocks to prevent operating errors. Electrical interlocks have been designed according to the circuit diagram. Interlock Function of interlock Method of operation of interlock Between the circuit-breaker withdrawable part and the low-voltage connector Switch cannot be moved into service position unless the low-voltage connector is inserted and lokked The low-voltage connector can only be inserted or removed while the withdrawable part is in its disconnected position The opening for the moving crank handle is locked The interlock between low voltage connector and the withdrawable part is activated Between the circuit-breaker withdrawable part and the earthing switch Between the circuit-breaker and the withdrawable part The withdrawable part cannot be moved to service position in while the earthing switch of the switchgear panel is in "ON" position The earthing switch cannot be switched on once the withdrawable part has left its disconnected position Circuit-breaker cannot be moved to service/disconnected position while it is switched on The circuit-breaker cannot be switched on unless it is completely set to its service/ disconnected position and the actuating crank for the withdrawable part mechanism has been removed The moving crank handle is uncoupled automatically The earthing switch cannot be switched on. Do not apply force! The opening for the moving crank handle is locked The circuit-breaker cannot be switched on or off 7.3 Charging the energy storing device Manually Move circuit-breaker in "ready-forclosing" position: 1. Insert crank into opening for tensioning the energy storing device (Fig. 7.5). 2. Charge the spiral spring using the spring charging crank. As soon as the spiral spring is charged, the spring charging mechanism is decoupled and the position indicator signals "charged" (Fig. 7.5). If the motor starts during this process, this does not constitute a risk. 3. Remove crank. The circuit-breaker is ready for closing (table in chapter 7.4, Pos. 2). Fig. 7.5 Turn spring charging crank until the position indicator of the energy storage device indicates "charged". Via motor The energy storing device of motorized circuit-breakers is charged automatically as soon as the supply voltage is applied. 19

20 7.4 Switching the circuit breaker Closing (ON) Push button "ON" (I) or Opening (OFF) l 0 Push button "OFF" (O) or actuate closing release electrically The position indicator shows the switch position "ON" (table item 3). The position of the auxiliary switch has changed. The energy storing device can be charged immediately after switching ON (by hand or by motor). If supply voltage is applied to the motor, charging is performed automatically. The position indicator shows the energy storing device position "charged" (table item 4). actuate via opening release or by undervoltage release or secondary release The position indicator shows the switch position "OFF" (table item 1 or 2). The position of the auxiliary switch has changed. Position indicators on circuit-breaker and possible operating sequences Item Position indicator Energy-storing device (closing spring) Position indicator ON/OFF Switch position possible operating sequence 1 released OFF none 2 charged OFF C - O 3 released ON O 4 charged ON O - C - O C = Switching ON O = Switching OFF 20

21 7.5 Actuate withdrawable part Observe interlock conditions (see chapter 7.2) Withdrawable part for PIX switchgear panels Move circuit-breaker from disconnected into service position by hand: Initial situation: Circuit-breaker Earthing switch OFF OFF 1. Insert crank handle with integrated slip coupling (Fig. 7.6) and move it clockwise to its stop or until the slip coupling reacts; the circuit-breaker is racked into its service position. Observe the position indicator on the switchgear panel Withdrawable part for PIX high current switchgear panels Move circuit-breaker from disconnected into service position by hand: Initial situation: Circuit-breaker Earthing switch OFF OFF 1. Push interlocking slide (Fig. 7.7, item 1) to the left to free the insertion opening. 2. Insert crank (2) and turn it clockwise to its stop. The circuit-breaker moves into service position. The position indicator must indicate "I" (3). 3. Remove crank. Move circuit-breaker from service into disconnected position by hand: Initial situation: Circuit-breaker OFF 1. Push interlocking slide (Fig. 7.7, item 1) to the left to free the insertion opening. 2. Insert crank (2) and turn it counter-clockwise to its stop. The circuit-breaker moves into disconnected position. The position indicator must indicate "O" (4). 3. Remove crank. 1 Fig. 7.6 Crank handle to rack the circuit-breaker in and out Remove crank handle. Move circuit-breaker from service into disconnected position by hand: Initial situation: Circuit-breaker OFF 1. Insert crank handle with integrated slip coupling (Fig. 7.6) and move it counter-clockwise to its stop or until the slip coupling reacts; the circuit-breaker is racked into its disconnected position. Observe the position indicator on the switchgear panel. 2. Remove crank handle. Fig. 7.7 Moving the withdrawable part in PIX High Current Panels 1 Interlocking slide to free the insertion opening 2 Crank 3 Position indicator I : Withdrawable part in service position 4 Position indicator "O": Withdrawable part in disconnected position Motor drive in the withdrawable part Enter command to the local or remote control. Observe position indicator. 2 21

22 8 Servicing 8.1 Safety Only specialist electricians certified by the manufacturer for maintenance work regarding series HVX vacuum circuit-breakers and who have the required knowledge regarding operation of medium-voltage switchgear are permitted to perform maintenance and cleaning work. Warning! Observe the safety provisions of Chapter 1.5. Warning! Risk of injury: The circuit-breaker must not be disassembled for maintenance work. Servicing schedule 1. On principle, the 5 safety rules applicable for electrical engineering must be complied with before maintenance work on the circuit-breaker is started: Isolate switchgear from power supply Prevent it from reclosing Verify it for zero voltage Earth and short-circuit it Cover or bar off adjacent live components. 2. Switch off the supply voltage for the circuit-breaker drive and secure it against reclosing. 3. Release the energy-storing device by performing the corresponding operating sequence on the circuit-breaker OFF ON OFF (see Chapter 7) and re-mount the drive s transport securing device (see Chapter 6). 8.2 Servicing schedule Series HVX vacuum circuit-breakers require regular inspections. The intervals depend on the strain to which the switches are subject during operation, and on the operating conditions. In case of frequent condensation or air pollution (dust, smoke or corrosive gases), the maintenance intervals must be adapted to the actual conditions. IMPORTANT: The circuit-breaker operating company is responsible for complying with the specified maintenance intervals and for performing maintenance according to the actual operating and ambient conditions. In case of queries or ambiguities, please contact the manufacturer. Maintenance intervals (ambient conditions according to IEC ) at least every 4 years after 20 years after 10,000 operating cycles of the circuit breaker after 1,000 operating cycles of the withdrawable part once the max. admissible number of breaking operations for the vacuum chambers has been reached (see section 8.7) Maintenance work Check for contamination/condensation and damage If necessary, clean circuit-breaker/withdrawable part (see section 8.3) and perform several switching tests Clean, grease circuit-breaker/withdrawable part (see Chapter 8.3 and 8.6) and perform several switching tests Check releases and blocking coils for proper working order Revision of the circuit breaker Revision of the withdrawable part Replace vacuum chambers Qualification/position performing the work Staff qualified accordingly for the work to be done Manufacturer's Service Center 22

23 8.3 Cleaning insulating components To ensure the specified insulating level, the insulating components must be clean. On principle, general cleanliness of the circuit-breaker or of its external parts should be ensured. Use a dry cleaning cloth for slight soiling: Clean by means of a dry, lint-free cloth. Depending on dirt collected, replace cloth as often as necessary. Use cleaning agents for severe soiling: Cleaning agent, 1 l can (see Chapter 9.2). The use of other cleaning agents is not admissible. Wear protective gloves Use cleaning agent according to manufacturer's instructions Soak the cloth thoroughly and wipe the insulating components. Keep duration of exposure as short as possible. Expose the cleaned surface to the air for at least two hours. When performing cleaning, make sure that the lubrication in the drive mechanisms is not removed. If the drive mechanisms are no longer sufficiently lubricated, new lubrication must be applied. 8.4 Corrosion protection Drive mechanisms and covers have a long-term protection against corrosion. Any damage to the paint, scratches and other damage must be repaired immediately to avoid corrosion. Contact the manufacturer's Service Center. 8.5 Avoid condensation To ensure the specified insulating level, the circuit-breaker - especially its insulating components - must not be exposed to condensation. Measures to take in case of condensation: 1. If condensation of the circuitbreaker is detected, the switching device must be cleaned according to section Inspect or install heating. It must provide a sufficient heating performance to prevent condensation on the circuit-breaker. 23

24 8.6 Lubrication instructions Warning! Comply with safety provisions (Chapter 1.5). Warning! Risk of injury: Circuit-breakers and drives must not be disassembled for service and maintenance work. The following elements must not be lubricated: - Motor - Electric releases - Push switches - Blocking coils - Auxiliary switches - Ball bearings Only approved lubricants may be used (section 9.2). Preparation Remove the withdrawable part from the switchgear cubicle for inspection (see instructions for the panel concerned). Remove the cover plate of the circuit-breaker drive and remount the drive s transport securing device. Lubricant Symbol Lubrication points Lubrication procedure Silicon grease Cryogenic grease High-pressure grease Contact lubricant Kontasynth Drive: lever on plastic housing of spring charging mechanism Drive: roller levers Drive: cam discs, cogwheels and other friction points Moving contacts, earth bar Lubrication points inside the circuit breaker s drive Clean lubricating points using a lintfree cloth or a soft paint-brush, if necessary using cleaning agent (use sparingly, just moisten points of lubrication). Apply a thin coat of lubricant (using e.g. a paintbrush). Fig. 8.1 Circuit-breaker drive mechanism 24 High-pressure grease Cryogenic grease Silicon grease

25 Withdrawable part in PIX switchgear panels Spindle of withdrawable part mechanism (Fig. 8.2, item 1). The spindle is accessible from below 2 Geared wheels of withdrawable part mechanism (only in case of motor-drive (Fig. 8.2, item 2)). The geared wheels are accessible once the lower front cover has been removed. 1 Fig. 8.2 Rack-in mechanism in PIX switchgear panels High-pressure grease 1 Spindle 2 Geared wheels Withdrawable part in PIX high current switchgear panels To obtain access to the lubrication points, the withdrawable part must be in service position (see chapter 7.5.2). KL FL Fig. 8.3 Rack-in mechanism in PIX high current switchgear panels Lubricant Points of lubrication Lubrication procedure Lubricant KL All accessible friction and sliding points in the rack-in mechanism Clean lubricating points using a lint-free cloth or a soft paintbrush, if necessary using cleaning agent (use sparingly, just moisten points of lubrication). Apply a thin coat of lubricant (using e.g. a paint-brush). Liquid lubricant FL Bearing, joints and guide mechanisms in the rack-in mechanism Pour drops of liquid lubricant (oil can, drip feed lubricator) into the bearing gap. Liquid lubricant gets between the bearing surfaces due to the capillary effect. In case of inaccessible lubrication points, use an extension tube or spray. 25

26 Moving contacts The lubrication procedure is described in the table on page 24. Fig. 8.4 Moving contacts Contact lubricant Kontasynth Final steps Remove transport securing device in the drive. Re-mount the cover plate and insert the circuit-breaker in the panel (see section 5). Check circuitbreaker according to section 6 "Commissioning". 26

27 8.7 Maximum admissible number of breaking operations of the vacuum chambers The diagram defines exclusively the maximum admissible numbers of breaking operations of the circuitbreaker as a function of the rated normal current I r and of the short-circuit breaking current I sc. It indicates when the vacuum interrupter chambers need to be replaced. Rated Bemessungs-Betriebsstrom (normal) current I r 1250 I r A, A, 2500 A, 3150 A, 3150 A A I r n Number of breaking Ausschaltzahl operations n Ausschaltstrom Breaking current log I a I a I SC I r = Rated (normal) current [A] I sc = Short-circuit breaking current [ka] The possible combinations depend on the rated normal voltage: I r [A] I SC [ka] 31, For the data regarding the rated normal current I r and the short-circuit breaking current I sc, please refer to the nameplate (Fig. 8.5). 1 2 Fig. 8.5 Data for rated normal current I r (1) and short-circuit breaking current I sc (2) on the nameplate 27

28 9 Annex 9.1 Accessories Fig. 9.1 Accessories for HVX circuit-breaker Position Designation Order no. 1 ON/OFF operating rod AGS H Spring charging crank for spring operating mechanism AGS H Moving crank handle with integrated slip coupling for withdrawable parts in PIX switchgear panels AGS H ) AGS H ) AGS H ) 4 Moving crank handle for withdrawable parts in PIX high current switchgear panels AGS C ) Withdrawable part, manually actuated, shape of insertion opening: hexagonal 2) Withdrawable part, manually actuated, shape of insertion opening: square 3) Emergency crank handle for withdrawable part, motor-actuated 9.2 Auxiliary products Only the following auxiliary products may be used, which are available from the manufacturer. The use of other auxiliary products is not admissible. Warning! Danger of injury when wrong handling the auxiliary products. Comply with the safety data sheets supplied by the manufacturers of the auxiliary products. Designation Symbol Order no. Cleaning agent, 1 l can S Contact lubricant Kontasynth, 0.5 kg can S High-pressure grease ST Cryogenic grease ST Silicon grease ST Lubricant KL, 0,5 kg can ST Liquid lubricant FL, 0,5 kg can S

29 9.3 Screw fastenings The following elements must be used for all metal screw couplings: Screws and bolts: Grade 8.8 Nuts: Grade 8. Thread size Tightening torque [Nm] min. max. M5 3,8 4,7 M6 7 9 M M M Table 1: Hex. bolts and socket-head capscrews (except slotted screws) and nuts Thread size Tightening torque [Nm] min. max. M6 5,5 7,5 M M M Table 2: Screw coupling between switching device and conductor bar with copper as conductor material 9.4 How to treat the contact surfaces Caution when handling bars insulated by heatshrinkable sleeves: The heat-shrinkable sleeve must not get into contact with lubricant (swelling). Contact areas coated with lubricant Kontasynth should not be touched, if possible. 1. Contact surfaces must be subjected to preliminary treatment before screw-fastening: Material of contact surfaces Pre-treatment Silver-plated contact surfaces Clean 1) Copper or copper alloy Clean 1), expose metallic surface 2) Aluminium Clean 1), expose metallic surface 2) Zinc-plated steel Remove passivation, not, however, the zinc layer 3) Hot-galvanized sheet-metal Clean 1), passivation need not be removed 1) Clean by means of lint-free cloth; use cleaning agent in case of serious contamination (see above) 2) Expose metallic surface by treating the entire surface with emery cloth or a rotating grinding tool (grain size 100 or 80) or using a wire brush which is clearly marked for use exclusively for aluminium or exclusively for copper 3) using a brass brush, steel brush 2. Immediately after the pre-treatment, coat the contact surfaces with lubricant Kontasynth so that the space between the contact surfaces is completely filled once the screws have been fastened. 29

30 Notes:

31

32 AREVA Energeitechnik GmbH - Sachsenwerk Medium Voltage - AGS AREVA AREVA, the AREVA logo and any alternative version thereof are trademarks and service marks of AREVA The other names mentioned, registered or not, are the property of their respective companies RCS PARIS - Creation: WAB Ingenieurdienstleistungs GmbH Bayreuth - Printed in Germany AREVA T&D Worldwide Contact Centre (0)