ABB Ltd. FACTORY IN HANOI

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1 ABB LTD. ABB Ltd. was originally a JVC between the Vietnamese Transformers Manufacture CTBT and the International Electromechanical group ABB Company was established 1st Sep Distribution Transformers Factory ABB Power Distribution ABB

2 ABB Ltd. FACTORY IN HANOI

3 ABB Power Distribution ISO 9001 Certificate

4 Oil Type Small Distribution Transformers ( kva) Construction features Description ABB Distribution Transformers manufactures three phase oil type small distribution transformers within the range up to 250 kva and 36kV. The transformers are adaptable for pole mounting or assembly in substations. Standard features Hermetically sealed transformers completely filled with oil: -Corrugating tanks -High and low voltage bushings in accordance with DIN and DIN Off-circuit tap changer in five positions -Lifting lugs -Earthing terminals Pressure relief valve. -Thermometer pocket in accordance with DIN (standard form 50 kva) -Filling pipe. -Drain cock -Rating plate -Uninhibited oil Oil level indicator. Transformers can also be manufactured with conservators. Other product types with different dimensions and technical specifications can be designed and manufactured on request. ABB Power Distribution

5 Core The magnetic circuit is of the three-column type with mitred joints. It is manufactured with firstrate, grain oriented silicon iron sheets insulated with carlite. The mounted core is clamped down in order to reduce vibrations and minimize noise levels. Windings The windings are either made of copper or aluminum; they are insulated with either pure cellulose or double enamel. Furthermore, the complete columns are manufactured to withstand short circuit stresses. Off-circuit tap changer The tapping (±2 x 2.5%) of the HV winding, are connected to the off-circuit tap changer located horizontally between the yoke and the tank cover. The handle is located on the cover and should be operated when the transformer is deactivated. The design prevents setting the off-circuit tap changer to intermediate positions. The mechanism can also be padlocked during normal transformer operation. Insulating oil The mineral oil with its electrical and chemical characteristics is in compliance with the IEC Standards and is P.C.B. and P.C.T. free. Tank and cover The sides of the tank are made of corrugated cooling surfaces. The bottom plate, side and frames are of welded construction. The welds are tested for oil tightness. The thermometer pockets, bushings, tap switch drive and lifting lugs are fitted on the tank cover. The cover is bolted to the tank frame. The undercarriage is welded the bottom plate and the rollers are suitable for either longitudinal or transverse movements. Painting and surface treatment Transformers are either hot-dip galvanized or painted. The metal parts are carefully sandblasted. The painting system is a powder coated. The topcoat is RAL 7033 or customized. The hot-dip galvanizing is 70 um minimum. ABB Power Distribution

6 Options and accessories -Plug-in bushings on HV -Max thermometer -Dial type thermometer with two contacts. -Off-circuit tap changer with 3 or 7 positions -Skid base -Bi-directional rollers Sparking gaps. -Pressure relief device with contacts. -Cable boxes -Integrated pole brackets on tank. Total enclosure on cover over HV and LV bushings. Testing The transformers are manufactured in accordance with ISO At the end of the manufacturing process the transformers are individually tested in accordance with the IEC Standards. The routine tests are: a) Measurement of the winding resistance b) Measurement of the voltage ratio and check of the vector group c) Measurement of the impedance voltage and measurement of load losses d) Measurement of no load losses and no local current e) Dielectric tests Upon request, witnessed type/special tests can be carried out. ABB Power Distribution

7 KVA HV1 (V) HV2 (V) LV (V) Vector Group Impedance (%) NLLooss (W) LLooss (W) Noise level (db) Total weight (kg) Oil weight (kg) Length (mm) L Width (mm) W Heigth (mm) H Ween base (mm) D YynO , YynO , YynO , Dyn YynO , Dyn , Dyn , YDynO , YynO YynO YynO YynO Dyn Dyn YDynO Dyn YynO YDynO Dyn Dyn Dyn YDynO Dyn Dyn Dyn Dyn Dyn Dyn YDynO Dyn Dyn YDynO ABB Power Distribution

8 KVA HV1 (V) HV2 (V) LV (V) Vector Group Impedance (%) NLLooss (W) LLooss (W) Noise level (db) Total weight (kg) Oil weight (kg) Length (mm) L Width (mm) W Heigth (mm) H Ween base (mm) D Dyn Dyn Dyn YDynO Dyn Dyn YDynO Dyn Dyn Dyn Dyn YDynO Dyn YDynO Dyn Dyn Dyn Dyn Dyn Dyn YDynO Dyn Dyn YDynO ABB Power Distribution

9 Oil Type Medium Distribution Transformers ( kva) Construction features Description MDT transformers are used to step down three phase high voltage to low voltage for power distribution, mainly in metropolitan areas and for industrial applications. The transformers in standard version are designed for use in moderate climates and can be installed both outdoors and indoors: The loading is in accordance with IEC 354. MDT transformers are hermetically sealed (the tank is completely filled with oil) or equipped with oil conservator. Both types are equipped with flexible corrugated tank walls enabling sufficient cooling of the transformers. They also compensate for the changes in the oil volume during operation. An advantage of the hermetically sealed transformers is that the oil is never in contact with the atmosphere thus avoiding periodic oil analysis. Standard features Hermetically sealed. - Oil filling pipe on the cover. - Oil-level indicator. - The two filling lugs on the cover are made for lifting the transformer or its removable part. - Corrugated tank. - Undercarriage with bidirectional rollers. - Pressure relief vales. - Oil drain valve. - Off-circuit tap changer handle. - Earthing terminals. - Rating plate. Additionally, for transformer (Rated power >= 1000 kva) - Max thermometer. - Buchholz relay. Core The cores of the transformers are made of grain oriented magnetic, cold-rolled silicon steel laminations with low losses. Windings The windings of the transformers are made of the high grade electrolytic copper or aluminum. The High Voltage windings are wound either with round, enamel insulated, or shaped, paper insulated wire. The low voltage windings are wound with shaped, paper insulated wire of foil. The winding construction is characterized by high dielectric strength with high resistance to atmospheric surges and to the effects of short-circuits. Neutral points of the Low Voltage windings are brought to the tank cover. Off-circuit tap changer The off-circuit tap changer is of a 5 position type connected on the High Voltage side with handle located on the cover. The tap changer should be operated only when the transformer is deactivated. ABB Power Distribution

10 Insulating oil The mineral oil with its electrical and chemical characteristics is in compliance with the IEC Standards and is P.C.B. and P.C.T. free. Tank and cover The cover is bolted to the tank frame. The transformer undercarriage is provided with bi-directional rollers turntable by π/2 rad (90 o ) to allow longitudinal and transverse movement on flat surface. Painting and surface treatment All metal parts are carefully sandblasted. External surfaces are painted immediately after pretreatment with an anti-prime coat. The finishing coat would be powder coated at 50 µm. If requested a hot-dip galvanized corrugated steel tank can be provided. transformers are individually tested in accordance with the IEC Standards. The routine tests are: a) Measurement of the winding resistance b) Measurement of the voltage ratio and check of the vector group c) Measurement of the impedance voltage and measurement of load losses d) Measurement of no load losses and no local current e) Dielectric tests Upon request, witnessed type/special tests can be carried out. Conservator transformer type Options and accessories - Plug-in - Sparking gaps - Pressure relief device with contacts - Cable boxes - Integrated pole brackets on tank - Skid base - Bi-directional rollers - Total enclosure on cover over HV and LV bushings. Testing The transformers are manufactured in accordance with ISO At the end of the manufacturing process the KVA HV1(V) HV2 (V) LV(V) Vector Group Impedance (%) No-Load Loss (W) Load Loss (W) Noise level (db) Total weight (kg) Oil weight Length (mm) L Width (mm) W Height (mm) H Wheel base (mm) D Dyn Dyn Dyn Dyn YDynO Dyn Dyn YDynO Dyn Dyn Dyn Dyn Dyn ABB Power Distribution

11 KVA HV1(V) HV2 (V) LV(V) Vector Group Impedance (%) No-Load Loss (W) Load Loss (W) Noise level (db) Total weight (kg) Oil weight Length (mm) L Width (mm) W Height (mm) H Wheel base (mm) D YDynO Dyn Dyn YDynO Dyn Dyn Dyn Dyn YDynO Dyn Dyn YDynO Dyn Dyn Dyn YDynO Dyn Dyn YDynO Dyn Dyn Dyn Dyn Dyn YDynO Dyn Dyn Dyn YDynO Dyn Dyn Dyn Dyn YDynO Dyn Dyn Dyn YDynO Dyn Dyn Dyn ABB Power Distribution

12 KVA HV1(V) HV2 (V) LV(V) Vector Group Impedance (%) No-Load Loss (W) Load Loss (W) Noise level (db) Total weight (kg) Oil weight Length (mm) L Width (mm) W Height (mm) H Wheel base (mm) D Dyn Dyn YDynO Dyn Dyn YDynO Dyn Dyn Dyn Dyn YDynO Dyn Dyn YDynO Dyn Dyn Dyn Dyn YDynO Dyn Dyn YDynO ABB Power Distribution

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14 SPECIFICATION FOR DISTRIBUTION TRANSFORMER CONTENTS 1.0 Scope 2.0 Codes and Standards 3.0 Quality Assurance 4.0 Transformer Technical Requirement 5.0 Test 6.0 Accessories 7.0 Documentation 8.0 Parts 1.0 SCOPE 1.1 The ABB Distribution transformer design is the basis for this specification. 1.2 This specification together with the applicable Transformer Data Sheet provides the technical requirements for the design, manufacture and test of distribution transformers. 1.3 This specification covers only the general requirements of the transformer. The specific requirements are stated on detailed on the Transformer Data Sheet. 2.0 CODES AND STANDARDS 2.1 All codes and standards referenced in this specification shall be those in effect at the time of Purchase Order award. Deviations from this specification and referenced codes and standards shall be obtained in writing from Buyer International Electrical Committee Standards ( IEC) Vietnamese Standards ( TCVN) Customized 2.1 It shall be the Seller s responsibility to be, or to become, knowledgeable of the requirements of these Codes and Standards. Any required changes or alterations to the equipment to meet the Codes and Standards requirements shall be at the expense of the Seller. 2.2 Equipment proposed by the Seller that cannot fully meet the requirements of this specification shall have all exceptions clearly stated in the proposal. No exception shall be allowed, unless approved by the Buyer in writing.

15 3.0 QUALITY ASSURANCE 3.1 ABB Transformers Ltd have specialized in the design, manufacture and assembly of distribution transformers for a minimum of 5 years. 3.2 We had a well documented quality assurance program, which includes procedures for all activities in order entry, design, material procurement, manufacturing processes, testing, shipping and post shipment product follow. 3.3 Our test floor had a documented calibration program. All equipment have received regular calibrations. Calibration standards shall be traceable to National Bureau of Standards. Records of all equipment calibration shall be made available to the Buyer upon request. 3.4 ABB Transformers Ltd. is certified to ISO 9001:1994 for design and manufacture of Power Distribution Transformer. A certificate of Compliance to this requirement shall be provided with the proposal. 4.0 TRANSFORMER TECHNICAL REQUIREMENT 4.1 Winding Characteristics All windings and internal connections shall be copper or aluminum The windings shall be tightly wound utilizing tension devices to place the conductor into the coils For optimum dielectric and mechanical strength, a minimum of two sheets of epoxy coated insulation shall be placed between each layer in the winding Sheet conductor shall be used in secondary winding to minimize vertical short circuit forces The transformer shall be designed and constructed to be completely self protected by its ability to withstand the external short-circuits, as defined by IEC standard The transformer design shall be capable of operating above rated voltage or below rated frequency in accordance with IEC standard The impedance shall be as specified on the Transformer Data Sheet. (IEC tolerance shall apply.) 4.2 Sound Level The distribution transformer shall be designed and constructed to minimize the audible noise generated with the transformer energized at rated voltage in operation. The acceptable noise level shall be in accordance with NEMA standard TR Bushings High voltage and low voltage bushings shall be furnished with the ratings shown on the Transformer Data Sheet The bushings shall be cover mounted and suitable for high and low voltage terminations as indicated on the Transformer Data Sheet.

16 4.2.3 Bushing location other than cover will be so documented on the Transformer Data Sheet. 4.3 Core The core shall be clamped and braced to resist distortion caused by shortcircuit stresses within rating or transportation handling and to prevent the shifting of core laminations The core shall be constructed of high-grade, grain oriented, silicon steel laminations, with high magnetic permeability. Core construction shall have proper joints to keep core losses, excitation current and noise level at a minimum. 4.5 De-Energized Tap Changer A manually operated de-energized tap changer shall be provided for changing the primary winding taps Full capacity taps shall be located in the high voltage windings and shall be in accordance with the Transformer Data Sheet The tap changer shall be capable of carrying the full transformer short-circuit current without damage or contact separation The tap changer shall be gang operated from a single operating point and shall have a position indicator The tap changer operating mechanism shall include provisions for pad locking in each tap position. 4.6 Insulating Fluid And Preservation System The fluid preservation system shall be a sealed tank type The insulating fluid shall be mineral oil or Silicone oil The transformer insulating fluid shall be certified to contain no detectable PCB s at the time of shipment and the tank shall be so labeled. Certification shall also be provided that the transformer and components have not been contaminated with PCB s prior to shipment The transformer insulating fluid shall meet or exceed the requirements of the appropriate IEC and ASTM fluid Standards. The transformer fluid shall be tested for dielectric breakdown and moisture content just prior at the time of shipment. 4.7 Tank Design The transformer tank, cooling equipment and compartments subject to pressures shall be designed to withstand, without permanent deformation, pressures of at least twenty-five percent greater than maximum operating pressures. The maximum design withstand pressure shall be indicated on the nameplate Tank design shall include sufficient expansion volume to allow operation under specified load conditions.

17 4.7.3 The main cover shall be bolted onto the tank One or more handholds shall be provided in the tank cover for access to bushing connections and current transformers, when required. The opening shall be of sufficient size to allow removal of any CT The transformer base shall be suitable for rolling or skidding in the direction of either tank base centerline The base shall be designed so the center of gravity of the transformer as assembled for transport does not fall outside the base for a tilt of fifteen degrees Lifting lugs shall be provided at each corner of the tank. The lifting lugs shall be designed to provide a minimum safety factor of Jacking area, pads or bosses shall be provided. When required Pulling provisions, for towing the transformer parallel to either centerline, shall be provided. 4.8 Gaskets The gaskets shall be compatible for the insulating fluid in the transformer tank Gaskets in continuous contact with Silicone fluid shall be Viton material Metal surfaces to which gaskets are applied shall be smooth, and shall have sufficient rigidity to assure proper compression of the gaskets. 4.9 Cooling System 4.10 Grounding Provisions The transformer shall be self-cooled All non-energized metallic components of the transformer shall be grounded Tank grounding provisions shall consist of one ground pad, welded to the base or to the tank wall near the base Wiring All devices mounted on the transformer shall be wired to the connection box Wiring shall be terminated with a ring-type insulated compression lug Each wire shall be identified with a wire marker All symbols and wiring identification systems shall be in accordance with the applicable IEC standard Nameplates Transformer shall be furnished with a non-corrosive diagrammatic nameplate, permanently attached with non-corrosive hardware. The diagrammatic nameplate shall include the name of the manufacturer of the equipment as well as the location where the transformer was manufactured and tested. In

18 addition, the transformer manufacturer and location of manufacture is to be supplied at the time of quotation The nameplate shall contain all connection and rating information in accordance with IEC standard, plus the approximate weight of parts to be lifted for un-tanking, type and quantity of oil, and the date of manufacture Exterior Finish The transformer painting system shall be the Seller s standard. The transformer shall be thoroughly sandblasted and phosphortized, then powder painting. 5.0 TEST 5.1 Testing Each transformer shall receive all standard routine tests as required by IEC Short Circuit withstand capability shall be verified by full short circuit tests on similar or larger units in accordance with the latest revision of IEC standard. Short Circuit withstand verification shall be submitted to the purchaser, upon request, prior to shipment of the t ransformers Optional tests, as indicated on the Transformer Data Sheet, will also be required The test facility used to perform loss tests shall utilize test equipment with calibration done by authorized office A certified test report shall be submitted and shall contain the test data for each transformer serial number manufactured. The certified test report shall as a minimum contain the data as specified in IEC. 6.0 ACCESSORIES 6.1 The transformer shall be equipped with a complete set of standard accessories Magnetic oil level indicator Thermometer pocket Pressure relief valve Oil filling pipe Drain valve. 6.2 Optional accessories as indicated on the Transformer Data Sheet Winding hot-spot temperature indicator with alarm contacts Pressure relief device {with alarm contacts} Thermometer with contacts Customized. 7.0 DOCUMENTATION 7.1 Drawing Requirements

19 7.1.1 The required drawing format is specified on the Transformer Data Sheet The outline drawings shall be completely dimensioned and, as a minimum, show the following: a. High voltage and low voltage bushing details. b. Location of all handholds. c. Location and identification of all accessories. d. Size and location of all conduit entrances for Buyers connections. e. Ground pad locations Wiring diagrams 7.2 Nameplate drawing Detailed connection (wiring) diagrams shall show the following: a. Interconnecting wiring of all components of the forced cooling equipment. b. Wiring of all devices with switches and relays, or electrical connections, including current transformers. c. Identification of all terminal blocks and all connections to be made by Buyer A nameplate drawing showing required IEC information shall be provided. 7.3 Installation, Operating, and Maintenance Instructions The seller shall provide an instruction, operating and maintenance manual covering all equipment furnished. 8.0 PARTS 8.1 The Seller shall provide a renewal parts list to the Buyer.

20 1. Table of Contents: Instruction Bulletin 1. Table of Contents 2. General Safety Notes 3. Receiving of Inspections 4. Storage 5. Installation 6. Operation 7. Periodic Maintenance and inspection 8. Trouble shooting guide 2. General Safety Notes The transformer is equipped with three earthing terminals, one on the cover and two others on the bottom. The transformer main earth must be connected to one of these earthing terminals. Transformer without cable boxes are not personnel proof and must be placed in a locked place where only authorized personnel are admitted. 3. Receiving Instructions 3.1 Receipt of inspection Upon arrival of the transformer, the following items shall be acted: - Scope of delivery shall be checked with the packing list. - Careful examination transformer surface and oil leakage, oil level and accessories. - After careful examination and acceptance, the bill of delivery shall be signed by authorized person. - If any defects are found during examination, a written claim shall be submitted to the forwarder and ABB Transformers Ltd. Within 3 working days. 3.2 Handling A proper handling for the on loading and off loading transformers are essential in order to avoid any damage to the transformer. All the provided lifting eyss or hooks must be used during the lifting of the transformer. The use of jack is only permitted when jacking pads are available. Shifting, movement and vibration during transportation shall be avoided. Especial care shall be given to finwalls and to the bushings. 4. Storage It is recommend that the transformer shall be installed and energized after delivered to the site with a minimum delay. However if the transformer can not be installed immediately, a dry place and protected from any weather conditions, preferably indoor if available, shall be used. If more than one transformer shall be stored, a minimum distance between the transformers shall be acted, in order to avoid collusion and routine inspection if needed. Transformers with a storage longer than twelve months shall be checked before installation. Check the oil level. Turn all manual tap-changer into

21 position for about 5 times. Oil sample shall be taken and analyzed if the dielectric strength of oil is still not be lower than 30 kv/2.5 mm. 5. Installation Distribution transformers can be installed outdoor or indoor. 5.1 Indoor installation Transformer can be moved to the final installation position by using wheels, rollers, crowbar or pulley. The transformer is normally natural cooled by surrounding air, therefore a good ventilation shall be ensured. An exchange of air in the room shall be given, so that the heat produced by the transformer can dissipate easily. A good ventilation is ensured if the cool air can be located at the top of the transformer room. The intake and outlet opening should be located diagonally across the room. As a guide, loosed of 1 kw require a cool air intake of 3 m3/min at 20 C. For a difference of 3 m in level between air intake and outlet, the outlet opening must have a cross-sectional area of about 0.4 m2 for losses of 5 kw, or 0.2 m2 for 2.5 kw. Note that the area of the cooling air intake may be less than of the warm air outlet by about 10 %. Nevertheless, the openings are to be made as wide as possible. The transformer shall be positioned at least 50 cm from the next partition or wall, or even to the next transformer, if there is any. The transformer can be located that an easy access is ensured for any maintenance works. The filling and draining plugs as well the couplings shall be free to access at any time Gauges, bucholz relay and pressure controllers shall be visible. 5.2 Outdoor installation The transformers can be used for pole mounted or pads mounted stations. The mounting base shall strong enough to support the transformers. Especial care shall be done between the safety distances of the life parts, especially the arcing horn. 5.3 Installation of dehydrating breather The dehydrating breather4 is used in transformer with conservator. Installation of dehydrating breather shall be done after positioning of the transformer. - Loose nut, which is located under the conservator. - Remove the protector. - Attach the tube connection to the conservator. - Use bolts and nuts to fix the tube connection to the conservator, use gasket between the connection and conservator. - Loose and remove the bottom of dehydrating breather and fill transformer oil up to the level marked and tighten it again. - Tight the cover of the dehydrating breather at the conservator, use the flat gasket between them. 5.4 Inspection prior to energizing Before energizing, check the following items: Check oil level by reading the oil level indicator, if the indicator is signaling white, then the transformer oil level is correct. If the indicator is signaling red, then contact with ABB Transformers Ltd. In case the

22 transformer with the conservator, Check oil level meter attached to the conservator with the corresponding ambient temperature. If the oil level is low, so the necessary amount of oil shall be filled Check insulation resistance of the winding by using a 1000 V megaohm meter. The value shall be at least: MΩ between low voltage winding and earth MΩ between high voltage winding and earth MΩ between high voltage winding and low voltage winding make sure that bushings are clean and dry before processing the measurements. If the reading are lower than the values above, then contact ABB transformers Ltd. 6. Operation The following checks shall be done according to a schedule control and maintenance plan during the operation of the transformer: - Oil level check - Tap changer - Pressure relief valve - Buchholz relay - Thermometer The transformer must operate according to loading guide of IEC standard. Accessories Standard Transformer type Sealed Open Standard Transformer type Sealed Open Bushings Thermometer with contacts Tap changer Thermometer w/o contact Thermometer pocket Oil level gouge with contacts Oil drain valve Pressure relief device Earthing terminal Oil level gouge w/o contacts Oil conservator Marshaling box Pressure relief valve Buchholz relay Dehydrating breather HV cable box Lifting lug on cover LV cable box Wheels Name plate Arcing horn on HV 7. Periodic Maintenance and inspection It is recommended to have an annual routine inspection and maintenance on transformer. Routine maintenance must be done by trained personnel and always in de-energized and insulated condition. The maintenance works shall include at least: - Clean of bushings and terminals - Checking of oil level, if the oil level is too low, than check also for possible leakage. - Testing the functionality of the protection devices - Checking the pain works and surfaces - It is not necessary to test oil under normal operation conditions.

23 8. Trouble shooting guide Symptom/ Problem Causes Overheating Continuous overload; Wrong external connections; Poor ventilation; High surrounding air temperature; Reduced or Zero Shorted turn; Loose primary tap connections. Voltage Excess Secondary High input voltage; Improper primary tap connections. voltage High conductor loss Overload; tap connections not on identical tap positions. Coil distortion Coil shorted circuit. Insulation failure Continuous overload; Short circuit in the windings; Lightening surge. Very high core temperature due to high input voltage or low frequency. Excessive cable heating Improper bolted connection. High voltage to ground Normally a static charge condition. Vibration and noise Low frequency; High input voltage; Core clamps loosened in shipment or handling. High exciting current Low frequency; High input voltage; Shorted turns. High core loss Low frequency; High input voltage. Low insulation Dirty on bushings; Quality of oil. resistance Burned insulation Lightning surge; Switching or line disturbance; Broken bushings; Taps or arrestors; Excess dirt or dust on coils. Breakers or fuse open Insulation failure; Short circuit; Overload.