Transformer bushing, type GOH Installation and maintenance guide

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1 ... Transformer bushing, type GOH Installation and maintenance guide

2 The information contained in this document may be subject to change without prior warning and should not be considered as binding on ABB AB s behalf. ABB AB accepts no liability for any errors that may appear in this document. ABB AB is not liable for any damage resulting from the incorrect interpretation of this document. This document, or parts thereof, may not be reproduced or copied without ABB AB s consent. It may not be distributed to others, or used by unauthorized parties. Any breaches to the above will be penalized with the support of applicable laws.

3 Contents 1 Safety Levels of safety risks Hazardous working situations Safety precautions Product description Design Technical specifications General specifications Mechanical loading Delivery Transport and long term storage Lifting the bushing Installation Tools Consumables Vertical mounting Horizontal mounting Inclined mounting Connections Mounting of oil-side conductors Mounting of air-side conductors Flange grounding Filling with oil Transformer factory test Commissioning Waiting time before energizing Recommended tests before energizing Overview Tightness test between transformer and bushing flange Measurement of capacitance and tan δ Check of through resistance Maintenance Recommended maintenance Re-packing Dismantling Re-packing of bushing after testing Spare parts Summary Disposal and environmental information Disposal and recycling Installation and maintenance guide 3

4 4 Installation and maintenance guide

5 1 Safety 1.1 Levels of safety risks Throughout the manual, various types of safety risks are indicated. The most serious level on this scale provides a warning about serious personal injury or possible death, or major damage to a product, if the instructions are not observed. Symbols and their meanings. The following describes the symbols that appear in the manual, along with their meaning. DANGER! The yellow, filled warning triangle warns that an accident will occur if the instructions are not complied with and that it will result in serious personal injury or death and/or major damage to the product. It is used, for example, to warn of such dangers as: contact with high voltage, explosion or fire risk, risk for toxic gases, risk of crushing, impacts, falls from high places, etc. CAUTION! The round warning symbol warns that an accident could occur if the instructions are not observed, and that this could result in personal injury and/or damage to the product. It is also used to warn of risks that entail burns, eye or skin injuries, impaired hearing, crushing or slipping injuries, tripping, impacts, falls from high places, etc. In addition, it is used to warn about functional requirements when assembling or removing equipment where there is a risk of damage to the product or that it might cause downtime. NOTE! The comment symbol identifies important information and conditions. Also used to indicate any danger that could lead to property damage. Torque The torque symbol indicates the tightening torque. 1.2 Hazardous working situations For all work on high-voltage devices, the following risks must be observed and corresponding measures taken. Risk Working close to high voltage. Working on ladders and platforms. Action Disconnect and earth around the workplace. If work must be carried out close to live plant components, the safety distance must be in compliance with the applicable safety regulations. Work must be executed in accordance with applicable safety regulations. Avoid the use of ladders and platforms in poor weather conditions. Installation and maintenance guide 5

6 1.3 Safety precautions Precaution Transformer oil: First aid: SF 6 -gas: Waste and cleaning up: Upon fire: Action Collect used oil in drums. Transformer oil is slightly harmful. Fumes from unused warm oil may irritate the respiratory organs and the eyes. After long and repeated contact with transformer oil skin becomes very dry. Skin contact: Wash the hands. Use skin cream to counteract drying. In the eyes: Rinse the eyes in clean water. Swallowing: Drink water or milk. Avoid vomiting. Contact medical attendance. SF 6 -gas must be recycled and never released to the atmosphere. Waste should be absorbed by an absorber. Treat it as hazardous to the environment. Fire should be extinguished by using powder, foam or carbon dioxide. 6 Installation and maintenance guide

7 2 Product description 2.1 Design The GOH is a capacitance graded oil impregnated paper bushing intended for immersed oil-air service. The conductor consists of a solid aluminium cylinder with cooling flanges at the oil side. For a more detailed description, see the Technical Guide, 1ZEC Overview G Outer terminal 2 Porcelain insulator 3 Mounting flange 4 Porcelain insulator 5 Oil side terminal with cooling flanges 6 Test tap Installation and maintenance guide 7

8 Test tap All bushings are equipped with a test tap connected to the outer layer of the condenser body. The test tap can be used for measuring the bushing insulation by capacitance and dissipation factor. During operation the protective cap must be fitted to ground the outer layer to the flange. The maximum test voltage for this test tap is 2 kv, one minute at 50 to 60 Hz. It serves as a test tap, and in connection with an external capacitance it can be used as a voltage tap. The operating voltage is limited to 500 V. CAUTION! The test tap should never be open during operation. It should always be connected to earth directly via the earthing spring or via an external impedance. G Stud 2 Earthing spring 3 Cover 8 Installation and maintenance guide

9 2.2 Technical specifications General specifications The table shows the standard technical specifications for the GOH oil - air bushings. For conditions exceeding the values, please contact ABB. Application: Classification: Ambient temperature: Altitude of site: Level of rain and humidity: Transformers Oil impregnated paper, capacitance graded, outdoor immersed bushing. +40 C to -40 C, minimum value according to temperature class 2 of IEC (-50 C according to GOST item 2.26.) < 1000 m (Bushings for other altitudes can be provided on request.) According to IEC and IEEE. Pollution level: According to specific creepage distance and IEC Immersion medium: Oil level in transformer: Max pressure of medium: Angle of mounting: Test tap: Capacitance C 2 of test tap: Transformer oil Maximum daily mean oil temperature: 90 C. Maximum temporary oil temperature, normal load: 100 C. Maximum temporary oil temperature, short time overload: 115 C. No lower than 25 mm from the bushing flange. 100 kpa (over pressure) 0 to 45 angle from vertical or horizontal. Test tap with 4 mm male contact pin. < 5000 pf Arcing horns: Conductor: Markings: N/A Solid aluminium conductor Conforming to IEC/IEEE Mechanical loading The bushings are designed for the following cantilever loads applied to the midpoint of the top end terminal, perpendicularly to the bushing axis. The bushing mounting angle can be 0-45 from vertical or horizontal. Bushing Type test load 1 minute (N) Max. cantilever operating load (N) GOH 170/ GOH 170/ GOH 170/ Installation and maintenance guide 9

10 10 Installation and maintenance guide

11 3 Delivery 3.1 Transport and long term storage Keep the transportation box protected from penetrating water when stored outdoors. The bushing shall be transported and stored vertically, with the top end upwards. Keep the bushings dry and clean and protected against mechanical damage. The transportation box should only be lifted with a applicable lifting gear at prescribed locations. Carefully inspect the bushings upon receiving with regard to shipping damage. Please note that the bushings have been routine tested in oil and some oil may remain on the oil side of the bushing. Long term storage G Securing device 3.2 Lifting the bushing Lift bushings with slings in the lifting eye at the top with the aid of a lifting tool. The weight of the bushing is stated on the rating plate. Lift the bushing to the vertical position and at an angle according to the figures. Use a soft bedding under the bottom end of the bushing, e.g. a rubber mat. NOTE! Transformer bushings should be stored in transport boxes until immediately before assembly. NOTE! Remove the transport securing device before lifting. Installation and maintenance guide 11

12 Lifting from the box CAUTION! For lifting the bushing from the box, secure lifting sling as shown. Be careful when lifting from a multipack. G Lifting the bushing G Soft bedding, i.e. rubber mat or wood board 2 Lifting eye 12 Installation and maintenance guide

13 4 Installation 4.1 Tools Tool Part number Note Lifting gear - - Soft bedding - Rubber mat or wood board Soft slings - - Torque wrench key for hex bolts, 18 mm (M12), 16 mm (M10) and 13 mm (M8), torque 20 to 60 Nm. Wrench for hex bolt 30 mm or adjustable wrench for 30 mm bolts or larger For test tap cover. Tackle - For mounting the bushing at a specific angle. 4.2 Consumables Brand Type / Name Note - Oil based vaseline Not harmful to the transformer oil, to lubricate bolts that come into contact with the transformer oil. MOBIL Mobil grease 28 For bolts that come in contact with the transformer oil. Not harmful to the transformer oil, to lubricate and protect the ground bolt and the outer terminal O-ring gasket. Burndy Penetrox A Aluminum to aluminum Installation and maintenance guide 13

14 4.3 Vertical mounting G Procedure When bushings type GOH are vertically mounted, the bushing's own expansion system is used. The sealing plugs shall not be removed. 1. Lift the bushing to the opening on the transformer. 2. Fasten the bushing to the transformer flange. CAUTION! If fixed stud bolts are used for fastening the bushing flange, it is advisable to apply plastic sleeves on two or three of the studs both to guide the flange and to prevent chipping of the stud bolts, with the subsequent risk of chips, falling into the transformer. Torque Use standard torque for the fasteners. End of instruction 14 Installation and maintenance guide

15 4.4 Horizontal mounting G Procedure 1. Lift the bushing to the opening on the transformer. The sealing plugs (1, 3) on the mounting flange shall be pointing upwards. G Remove the oil-side plug (1) and mount it in the tapped hole (2) in the flange. 3. Fasten the bushing to the transformer flange. CAUTION! If fixed stud bolts are used for fastening the bushing flange, it is advisable to apply plastic sleeves on two or three of the studs both to guide the flange and to prevent chipping of the stud bolts, with the subsequent risk of chips, falling into the transformer. Torque Use standard torque for the fasteners. End of instruction Installation and maintenance guide 15

16 4.5 Inclined mounting The bushing can be mounted up to 45 angle from vertical without any special preparations. G Procedure for inclined mounting Follow this procedure when mounting the bushing at > 45 angle from vertical. For horizontal mounting, see Horizontal mounting, page Lift the bushing to the opening on the transformer. The sealing plugs (1, 3) on the mounting flange shall be pointing downwards. G Remove the oil-side plug (1) and mount it in the tapped hole (2) in the flange. NOTE! Collect the oil from the bushing in a container (approx 10 l). 16 Installation and maintenance guide

17 3. Fasten the bushing to the transformer flange. CAUTION! If fixed stud bolts are used for fastening the bushing flange, it is advisable to apply plastic sleeves on two or three of the studs both to guide the flange and to prevent chipping of the stud bolts, with the subsequent risk of chips, falling into the transformer. Torque Use standard torque for the fasteners. End of instruction Installation and maintenance guide 17

18 4.6 Connections Mounting of oil-side conductors Overview NOTE! Mounting of the conductors must be performed according to procedure. The contact surfaces must be clean. The oxide on connected terminals is to be removed according to the instructions. Failure to perform a proper connection may result in overheating. NOTE! Do not use stainless steel bolts or bolts with a coating at the oil side terminal. Stainless steel can easily be mistaken for shiny zinccoated. The risk of the thread cutting is also increased if stainless steel is used. The GOH terminal is provided with many bolt holes for the connection to create a number of distinct areas with defined and relatively high pressure. We recommend a thickness of the opposite contact that is less than the radius of the plain washer. We recommend a flatness deviation not exceeding 0.1 mm and a relatively high surface roughness (Ra 6.3). The oil-side connections surfaces are, as standard, plated with a tin-zink alloy, called firinite. Firinite allows the mounting of coated conductors without special treatment like wire brushing. For the long term stability, it is an advantage to limit the number of materials in the contact. To get an optimal contact, use aluminum contacts with tin coating. Preparations for uncoated conductors before mounting 1. Use abrasive cloth, type scotch-brite (brown) or a stainless steel brush to remove the oxide. 2. Apply contact grease (vaseline) on the entire surface and rub (or brush) the surface in two directions until the entire surface has been treated. 3. Remove all the contaminated grease and apply new contact grease on the surface and remove the excess. End of instruction Mounting of conductors 1. Inspect and clean the bushings oil-side terminals with a dry cloth. At delivery the terminals are greased with vaseline. CAUTION! Do NOT use a wire brush. 2. Apply new contact grease on the surface and remove the excess. 18 Installation and maintenance guide

19 3. Lubricate and mount the transformer conductors to the bushing terminal with bolts, spring washers and washers. Use spring washers to maintain a sufficient permanent contact pressure. Place every spring washer on a flat washer of larger diameter. The bolts must have an inset of minimum 18 mm and maximum 30 mm in the oil-side contact. CAUTION! The oil side terminal bolt holes are furnished with stainless thread inserts. The bolts must be tightened by hand for the first turns, to ensure that they are correctly mounted. NOTE! Preferably use untreated washers and black oxide bolts of steel (property class 8.8). G Flexible connector 2. Inner terminal (bottom) 3. Bolt (M12 property class 8.8) 4. Flat washer (13x36x4) 5. Spring washer (13x29x3 / N) For recommended lubricants, see Consumables, page Screw in the bolts (3) by hand, to ensure they don't bottom out in the oil side contact. CAUTION! Screw in the bolts by hand, otherwise damaged thread-inserts and poor contact pressure with overheating as result may occur. G Tighten the bolts. CAUTION! Do NOT use an impact driver / wrench! Torque 60 Nm (M12) End of instruction Installation and maintenance guide 19

20 4.6.2 Mounting of air-side conductors Overview NOTE! Mounting of the conductors must be performed according to procedure. The contact surfaces must be clean. The oxide on connected terminals is to be removed according to the instructions. Failure to perform a proper connection may result in overheating. The GOH terminal is provided with many bolt holes for the connection to create a number of distinct areas with defined and relatively high pressure. We recommend a thickness of the opposite contact that is less than the radius of the plain washer. We recommend a flatness deviation not exceeding 0.1 mm and a relatively high surface roughness (Ra 6.3). The air-side terminal plates connections surfaces are, as standard, plated with a tin-zink alloy, called firinite. Firinite allows the mounting of coated conductors without special treatment like wire brushing. Both sides of the terminal plates at the air-side, are plated and can be used for connection. For the long term stability, it is an advantage to limit the number of materials in the contact. To get an optimal contact, use aluminum contacts with tin coating. Aluminum + tin plating Aluminum + silver plating Copper (no plating) Copper + tin plating Copper + silver plating Aluminum (no plating) Preferred choice Good Good Good Good Not recommended Preparations for uncoated conductors before mounting 1. Use abrasive cloth, type scotch-brite (brown) or a stainless steel brush to remove the oxide. 2. Apply contact grease (vaseline) on the entire surface and rub (or brush) the surface in two directions until the entire surface has been treated. 3. Remove all the contaminated grease and apply new contact grease on the surface and remove the excess. End of instruction Mounting of conductors 1. Inspect and clean the bushings air-side terminals with a dry cloth. At delivery the terminals are greased with vaseline. Apply new contact grease on the surface and remove the excess. CAUTION! Do NOT use a wire brush. 20 Installation and maintenance guide

21 2. Lubricate and mount the air-side conductors to the bushings air-side terminal with bolts, spring washers and washers. In order to maintain a sufficient permanent contact pressure, use spring washers on both sides of the terminal plate. Every spring washer shall be placed on a flat washer with larger diameter. G Flexible connector 2. Outer terminal (top) 3. Bolt (M12 or 1/2") 4. Nut 5. Flat washer (13x36x4) 6. Spring washer (12x29x3 / N) For recommended lubricants, see Consumables, page Tighten the bolts. All bolts shall be lubricated before tightening. Torque 60 Nm (M12) End of instruction 4.7 Flange grounding Overview The bushing flange has a tapped hole M12. After tightening the bolts that secure the bushing to the transformer tank, the flange should be grounded. This prevents electrical discharges between the bushing flange and transformer tank under normal service conditions. There are two alternatives. Alternative 1, using pointed set bolt 1. Heavily grease the pointed set bolt (13) with Mobilgrease 28. NOTE! Or use another suitable lubricant. G M12 stainless steel A4-80 recommended Installation and maintenance guide 21

22 2. Tighten the bolt (13) penetrating the paint of the transformer tank down to the metal beneath. This makes an electrical connection between the bushing and the transformer tank, keeping them at the same voltage. Torque 40 Nm End of instruction Alternative 2, using flexible cable 1. Run a flexible cable (14) between the M12 grounding hole in the bushing flange and a corresponding connection point in the transformer. G M12 stainless steel A4-80 recommended 2. Heavily grease the bolt (13) with Mobilgrease 28. NOTE! Or use another suitable lubricant. 3. Tighten the bolt (13). Torque 40 Nm 4. Connect the other end of the cable (14) to the transformer. 5. This makes an electrical connection between the bushing and the transformer tank, keeping them at the same voltage. End of instruction 4.8 Filling with oil Oil-filling with vacuum At the oil filling of the transformer under vacuum, the bushing will be completely oil filled and therefore no venting will be needed afterwards. The expansion of the bushing oil will be taken care of by the main oil system of the transformer. 22 Installation and maintenance guide

23 Oil-filling without vacuum In cases when the transformer is not filled under vacuum (e.g. at exchange of bushing at remote places) and the bushing oil system is connected to the main oil system of the transformer, the following instructions are valid. 1. Fill the transformer with oil to the right level. 2. A horizontally mounted bushing shall be vented by removing the plug on the air side (3) of the flange. G Vent the bushing. 4. An inclined bushing, with mounting angle more than 45, shall be vented by removing the plug (4) in the top end plate. G When it is assured that the bushing is filled, fit a new gasket and tighten the plug. Torque 20 Nm End of instruction Installation and maintenance guide 23

24 4.9 Transformer factory test Risk of gas bubble evolution during transformer factory test When the temperature of a sealed oil impregnated bushing is increased, the thermal expansion of the oil increases the pressure, and nitrogen from the expansion space is dissolved into the oil. At rapid cooling, the oil becomes oversaturated and bubbles may appear. Such bubbles have caused partial discharges and dielectric failures at transformer factory tests where a heat run was followed by fast cooling and dielectric testing. In cases where experience shows that a GOH bushing in combination with a test sequence has generated bubbles, it is recommended to manage the situation by ventilating the bushing during the heat run and during the following dielectric tests. It is not necessary to pressurize the bushing during the dielectric tests. If the heat run has been performed with the bushing sealed and unexpected bubbles and partial discharges appear at dielectric tests, the bushing can be opened at this stage. GOH bushings are filled with degassed oil and sealed witha gas cushion at atmospheric pressure in the top expansion space. During transport and handling, some of the gas molecules are dissolved into the oil and the bushing operates at a pressure below atmospheric. Ventilating the bushing at transformer dielectric tests will increase the pressure to atmospheric and thus instantly diminish the oversaturation. GOH bushings mounted horizontally or inclined do not generate gas bubbles because the connection to the transformer oil system keeps the bushing oil pressure at a stable level. A detailed explanation of the gas bubble evolution phenomenon is given in product information: 1ZBC000001C2704, "Gas bubble evolution in oil impregnated bushings". Vent the bushing during the heat run and dielectric tests DANGER! No work at all may be performed on the bushing while it is energized or ungrounded. 1. Remove the oil filling plug (4) to vent the bushing. G When testing is completed, fit a new gasket and tighten the plug. NOTE! Tighten when bushing temperature is between +5 C and +35 C. It is not necessary to pressurize the bushing when it is sealed. Torque 20 Nm 24 Installation and maintenance guide

25 3. CAUTION! It is important that the bushing is properly sealed when the testing is completed. End of instruction Installation and maintenance guide 25

26 26 Installation and maintenance guide

27 5 Commissioning 5.1 Waiting time before energizing CAUTION! When a bushing has been stored horizontally, it must be raised with the top up for at least 12 hours before service voltage is applied and 24 hours before test voltage is applied. If, by mistake, the bushing has been stored horizontally more than one year, it must be placed in the vertical position for at least one week before energizing. Some waiting time may be necessary before energizing in order to avoid flashovers or partial discharges due to airbubbles at the bushing surface. Vacuum filled transformer No waiting time is necessary regarding the bushing. De-gassed oil-filled transformer During mounting, use a clean and dry paintbrush to release surface bubbles. Wait 6 hours before energizing. Gas-saturated oil-filled transformer During mounting, use a clean and dry paintbrush to release surface bubbles. Wait 24 hours before energizing. NOTE! A certain amount of waiting time may be necessary before energizing to avoid flashovers or partial discharges due to air bubbles on the bushing surface. Choose a suitable procedure. Installation and maintenance guide 27

28 5.2 Recommended tests before energizing Overview The following tests should be performed to check the insulation, sealing and current path of the bushing. NOTE! The tests should be performed after installation, but before connecting the outer terminal of the bushing to the rest of the switchyard power circuit Tightness test between transformer and bushing flange Several different methods may be used and we thus refer to instructions provided by the company responsible for field erection. As a simple example, the tightness of the seal between a transformer and bushing flange can be checked when the transformer is oil-filled by using chalk or, perhaps easier, with paper strips Measurement of capacitance and tan δ After mounting, a capacitance measurement is recommended. Connect a measuring bridge between the outer terminal and the test tap/voltage tap. Or use ABB s test tap adapter ( C). This can be done without removing the bushing as the bushing has an insulated test tap. More details can be found in product information , Bushing diagnostics and conditioning. G Test tap 2 Cover ( B) with O-ring (1ZSC AAW) 28 Installation and maintenance guide

29 With the transformer de-energized and the bushing outer terminal disconnected, the test tap cover is removed. The measuring equipment is connected to the test tap and the measuring voltage source to the bushing terminal. The capacitances C 1 between the outer terminal and the test tap, and the capacitance C 2, between the test tap and the flange are marked on the rating plate. The nominal capacitances C 1 of the different bushing types are listed in the table. C 2 is highly dependent on the surrounding parts inside the transformer and it is not possible to provide a nominal value valid for all service conditions. CAUTION! The test tap is not self grounding. Since C 2 is usually relatively small, the test tap must never be open-circuited when applying a voltage to the bushing. It must always be grounded or connected to an external impedance. No connection may destroy the bushing. NOTE! When not measuring, always make sure that the cover is properly tightened with the O-ring in place. This is to prevent dust and water from entering the test tap. NOTE! The transport container must be removed before measuring capacitance and tan δ. Bushing Catalogue No Nominal capacitance (pf) C 1 (C 2 ) GOH 170/10 LF GOH 170/16 LF GOH 170/25 LF Test tap adapter An adapter (1ZSC AAC) is available for permanent connection to measuring circuits. G Installation and maintenance guide 29

30 5.2.4 Check of through resistance The through resistance measurement method depends on the design of the transformer. In general, a current is applied from bushing to bushing. The voltage drop from outer terminal to outer terminal is measured. The resistance is calculated with Ohm s law, U = R*I. (U: Measured voltage drop. I: Through current. R: Total circuit resistance). The total through resistance is the sum of the transformer winding and lead resistance and the bushing conductor and contact resistance. The additional resistance from the bushing conductor should not be more than mω. Since the through resistance of the HV winding of a typical power transformer is in the order of Ω, this is a very rough method that can only be used to detect very large faults in the current path, such as open circuits. Less-than-perfect contacts can only be detected by making a sensitive measurement across each connection point, or by measuring the temperature increase during operation with an infrared sensitive camera (thermovision). 30 Installation and maintenance guide

31 6 Maintenance 6.1 Recommended maintenance The bushings are in principle maintenance free; no regular maintenance is needed. DANGER! No work at all may be performed on the bushing while it is energized or ungrounded. Cleaning of insulator surface Under conditions of extreme pollution it may be necessary to clean the insulator surface. This should be done by wiping with a moist cloth. If necessary, ethyl-alcohol or ethyl-acetate may be used. NOTE! 1,1,1 -Trichloroethane or Methylchloride are not recommended due to their possibly harmful and environmentally detrimental properties. Measurement of capacitance and tan δ Please refer to Measurement of capacitance and tan δ, page 28. Thermovision (infrared camera) check for local overheating on connectors At maximum rated current, the bushing outer terminal normally handles a temperature of about 35 to 45 C above the ambient air. Significantly higher temperatures, especially at lower current loading, can be a sign of bad connections. Tightness check Make a visual inspection for oil leakage during normal station supervision. Checking of oil level and oil sampling CAUTION! Oil sampling and dissolved gas in oil analysis. Normally we do not recommend taking oil samples or opening our bushings. The bushing is sealed and tightness tested at the time of manufacturing. An oil sampling means that the bushing has to be opened. Thus, there is also a risk of improper sealing after the sampling is finished. However, when a problem is known, for example high power factor over C 1 or visible leakage, there might be a need for oil sampling and gas analysis or oil level check. In this case, ask for product information "Bushing diagnostics and conditioning". Installation and maintenance guide 31

32 32 Installation and maintenance guide

33 7 Re-packing 7.1 Dismantling For bushings mounted vertically no special precautions are needed after removal, because the bushings are sealed. Storing a bushing completely oil filled without expansion space could result in a high internal pressure. For bushings mounted horizontally or inclined >45, follow the procedure. Procedure 1. Remove the bushing from the transformer. 2. Remove the plug from the flange (2) and insert and tighten it in the oil side hole at the flange (1). G Torque 20 Nm 3. Place the bushing vertically. 4. Remove the plug (4). G Use a dry and clean dipstick and check the oil level through the oil filling hole (4) at the top. 6. Adjust the oil level, if necessary, to 95 ±5 mm (from top of the flange at 20 ±10 C). Installation and maintenance guide 33

34 7. Fit a new gasket and tighten the plug (4). Torque 20 Nm End of instruction 7.2 Re-packing of bushing after testing G Securing device NOTE! The bushing and transformer must be marked for final erection at the same position. NOTE! The transformer bushing(s) should be re-packed in the transport box as per delivered. The bushing should be fixed in axial and radial direction, and secured against rotation. At the ABB factory, the bushing box is closed with bolts and plastic straps. It is advisable to use bolts and plastic straps when reclosing the box after transformer testing. 34 Installation and maintenance guide

35 8 Spare parts 8.1 Summary In the event of major damage to the bushing we recommend that it be returned to ABB for possible repair and re-testing. Certain parts that may be damaged or lost during transport or installation, can be ordered from ABB. Installation and maintenance guide 35

36 36 Installation and maintenance guide

37 9 Disposal and environmental information 9.1 Disposal and recycling ABB strives to minimize the product s impact on the environment throughout its entire life cycle. Technical and product development focuses on environmental aspects. The ecocycle approach is strived for and consideration is taken to the materials environmental impact and recycling alternatives. The manufacturing processes are selected to be as safe for the environment as possible. Disposing of worn-out equipment Worn-out equipment must be phased out in an environmentally sound manner. When disposing of used equipment, much of the material, or energy content in the material, can be recycled following sorting and cleaning. The amount that is recycled varies depending on the technical resources and experience in each country. Non-recyclable components should be sent to an approved environmental waste treatment plant for destruction or disposal. Porcelain After cleaning, the porcelain can be sent for disposal or used for other purposes, such as for use as filling material. Electronics Electronics equipment should be sent to an approved recycling company or sorted into different component materials for appropriate treatment. Metals Metals should be sorted according to type and surface coating and sent to an approved recycling company. Following the removal of any paint or other surface coating, clean metal can usually be melted down and used in new products. Many metal components of iron, steel and aluminum are large and easy to identify, e.g. support structures. ABB strives to reduce the use of precious metals and the release of environmentally hazardous metals. Recycling of these is particularly important. Precious metals such as copper and silver are expensive and are only present in small amounts in the Earth s crust. Copper is primarily used in current paths, puffers, contacts and cables. Silver plating of contacts may occur. Emissions from certain metals may cause damage. This applies to copper, but also zinc and nickel, which are used sparingly as surface coatings. Plastics The different types of plastic should be separated and sent to an approved environmental waste treatment plant or recycling company. The energy content in thermoplastics and thermosetting plastics can often be recovered through combustion at a plant designed for the purpose. Thermoplastics can usually be melted down and reused without any major loss of quality. Composites can be fractioned and used as filling materials in other materials or be disposed of. Installation and maintenance guide 37

38 Oils and greases Before disposal, oil, grease and similar products must be removed and sent to an approved environmental waste treatment plant or recycling company. By utilizing gravimetric forces, oil waste can be separated into oil, water and a range of contaminants. In many cases, the oil can then be reused. Alternatively, the energy content in oil can be recovered through combustion at a plant designed for the purpose. Rubber Rubber can be sent to an approved environmental waste treatment plant, either for disposal or reuse for various purposes. Rubber is present in various seals. Other materials Other materials are sorted and sent to an approved environmental waste treatment plant. 38 Installation and maintenance guide

39

40 Contact Us ABB AB Components SE Ludvika, Sweden Phone: Fax:

1ZSC000563-AAC en, Rev. 7. Resin impregnated paper bushing, oil to air, type GSB Technical guide

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