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ABB GOE 2600 Installation And Commissioning Manual
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ABB GOE 2600 Installation And Commissioning Manual

Transformer bushing
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1ZSC000563-AAF EN, REV. 4, 2021-06-23
Transformer bushing, type GOE 2600
Installation and commissioning guide

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  • Page 1 1ZSC000563-AAF EN, REV. 4, 2021-06-23 Transformer bushing, type GOE 2600 Installation and commissioning guide...
  • Page 2 The information contained in this document may be subject to change without prior warning and should not be considered as binding on Hitachi ABB Power Grids’s behalf. Hitachi ABB Power Grids accepts no liability for any errors that may appear in this document. Hitachi ABB Power Grids is not liable for any damage resulting from the incorrect interpretation of this document.

  • Page 3: Table Of Contents

    Contents Safety Levels of safety risks ................................... 5 Hazardous working situations ..............................6 Safety precautions..................................6 Competence level..................................6   Product description Design ......................................7 Technical specifications ................................10 2.2.1 General specifications ............................... 10 2.2.2 Mechanical loading..............................11   Delivery Incoming inspection..................................
  • Page 4   Commissioning Waiting time before energization ..............................53 Recommended test before energization ............................. 54 5.2.1 Overview ................................... 54 5.2.2 Tightness test between transformer and bushing flange................... 54 5.2.3 Tightness test of bushing outer terminal........................54 5.2.4 Measurement of capacitance and dissipation factor ....................55 5.2.5 Measurement of through-resistance..........................

  • Page 5: Safety

    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.

  • Page 6: Hazardous Working Situations

    1.2 Hazardous working situations Hazard Action Working close to high voltage. Disconnect all plant power. Ground all objects at the workplace. If work must be done close to live plant components, make sure that the safety distance is in compliance with the applicable safety regulations.

  • Page 7: Product Description

    2 Product description 2.1 Design Overview The GOE 2600 is a capacitance graded oil impregnated paper bushing made for immersed oil/air service. General schematics Oil plug Oil-level gauge Bottom contact Oil sampling valve ½” Mounting flange Top housing Porcelain insulator, air side...
  • Page 8 * All unlocked threads must be locked with threadlocking fluid, when the bushing is installed at site. Fixed bottom contact The fixed bottom contact is installed when it is delivered from Hitachi ABB Power Grids. CAUTION! Do not remove the six fixing bolts.
  • Page 9 Fixed bottom contact Test tap The bushing has a test tap that is connected to the outermost conductive layer of the condenser core. The test tap is used to measure the bushing insulation by capacitance and dissipation factor. The cover connects the outermost conductive layer to ground, and must always be installed when the bushing is energized.

  • Page 10: Technical Specifications

    – Technical guide 1ZSC000563-ACS and Installation and maintenance guide 1ZSC000563-ACD. 2.2 Technical specifications 2.2.1 General specifications Refer to the table for the standard technical specifications of the bushing. For conditions exceeding the specifications, please contact Hitachi ABB Power Grids. Application: Transformers Classification: Transformer bushing •...

  • Page 11: Mechanical Loading

    NOTE! The loads described in this section are static loads, for dynamic loads such as earthquakes and extreme wheather conditions, please contact your Hitachi ABB Power Grids sales representative. Maximum cantilever load at installation angle 0° Maximum axial static load...
  • Page 12 Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...

  • Page 13: Delivery

    3 Delivery 3.1 Incoming inspection • Make sure that all items have been delivered, refer to the packing list. • Carefully inspect the bushings for shipping damage. NOTE! The bushing has been routine tested in oil, and there can be small quantities of oil remaining on the oil-side of the bushing.

  • Page 14: Lifting

    As an alternative: keep the bushing in the transport box and lift it to an inclined position, with the top end upwards and at an angle of at least 7°. The bushing is delivered from Hitachi ABB Power Grids in a transport box, and the bushing is held in place by support blocks in the box.

  • Page 15: Lifting The Bushing Out Of The Transport Box

    Procedure Make sure that the crane and the soft lifting slings are approved for the total weight of the transport box and bushing. Refer to the weight in the packing list. Attach soft lifting slings (8). Make sure that the angle of the soft lifting sling is not more than 20°. Carefully lift the transport box.
  • Page 16 Remove the support blocks from the transport box and put them on the ground. CAUTION! Make sure that the ground is flat. Install the lifting tool (88) on the flange. Attach a soft lifting sling to the lifting tool (88) on the lower part of the flange and then to the crane hook.
  • Page 17 Lower the bushing onto the support blocks. Remove the soft lifting sling at the top part of the porcelain insulator. End of instruction Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...
  • Page 18 Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...

  • Page 19: Installation

    Box spanner 9760 669-B For removal, and installation of the draw-rod system. 4.2 Consumables Item Brand Hitachi ABB part Note number Oil based Vaseline Fuchs For treatment of contact surfaces. Does not react with transformer oil. Mobilgrease 28...

  • Page 20: Preparations

    4.3 Preparations 4.3.1 Installation of lifting tools Overview Lifting tool, PDV1909-1 Lifting yoke, PDV1909-4 Loosen the M8 bolts (24). Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...
  • Page 21 Remove the M10 bolts (6), and then remove the outer terminal (5). Place the lifting tool, lower part (1) around the porcelain. NOTE! Make sure the rubber protection protect the bushing. Close the lifting tool (1) and install the bolts. NOTE! Align the side of the lifting tool with the oil-level guage (26).

  • Page 22: Lifting The Bushing For Installation On The Transformer

    Install the tie bolts (86). Place the lifting tool, top part (1) on the top and tighten the nuts. End of instruction 4.3.2 Lifting the bushing for installation on the transformer Procedure Make sure that the crane can lift the bushing. Refer to the net weight in the packing list. Align the second crane hook with the lifting tool, top part on the bushing.
  • Page 23 Carefully lift the bushing from the floor. CAUTION! Make sure that the bushing does not rotate. Lift the bushing up from the floor with both cranes. Lift the upper part of the bushing. Stop when the bushing is in a vertical position. Remove the lower soft lifting slings to the crane.

  • Page 24: Installation At The Transformer Factory

    4.4.1 Removal of the lower draw rod with bottom contact from the bushing Overview The bottom contact is usually installed in the bushing when it is delivered from Hitachi ABB Power Grids, the first step at the transformer factory is thus to remove it.
  • Page 25 Make sure that more than 10 mm of the threads on the upper draw rod (35) is used by the shaft (37). Put the hydraulic jack (38) on the shaft (37), and install the nut (44) and washer but do not tighten it.
  • Page 26 Loosen the nut (44). Turn the shaft (37) counter clockwise to remove the shaft-socket from the upper draw rod (35). Remove the hydraulic jack (38) from the bushing. Apply Molykote Multilub to the threads on the pull-through cord (12), then connect it to the upper draw rod.

  • Page 27: Installation Of The Small Bottom Contact (N1=4) In The Transformer

    Remove the draw rod nut (10). NOTE! The draw rod will fall out of the bushing if it is not in the horizontal position. Pull down the draw rod from the bottom end of the bushing, and disassemble it at the lower joint (39). NOTE! The upper thread (60) is locked with thread-locking fluid grade 42.
  • Page 28 Procedure Install the springs (15), the guiding sleeves (16), the pressing ring (17), and the hex screws M10 (18) to the bottom end of the bushing. Torque 40 Nm Put the winding cables through the end-shield. Install the winding cables to the bottom contact. CAUTION! Make sure that there is no tension in the winding cables.

  • Page 29: Installation Of The Large Bottom Contact (N1=6) In The Transformer

    Continue with Installation of the bushing on the transformer, page 31. End of instruction 4.4.3 Installation of the large bottom contact (N1=6) in the transformer Overview The end shield can be installed to both the large bottom contact and the bottom nut of the bushing. This procedure describes installation on the bottom contact.
  • Page 30 Install the winding cables to the bottom contact. CAUTION! Make sure that there is no tension in the winding cables. Tension in the winding cables will cause damage to the draw rod or cables. Torque 68 ±6 Nm Install the end shield: Push the end shield carefully against the pressing ring (17), until the hex screw heads come through the holes in the end shield.

  • Page 31: Installation Of The Bushing On The Transformer

    It is important to install the draw rod correctly, thus the ends of the draw rod parts must make contact at (67). CAUTION! Do not disassemble the joints (52), these are correctly assembled and locked with tread-locking fluid by Hitachi ABB Power Grids. Procedure Connect the upper draw rod (35) to the lower draw rod (4).
  • Page 32 Make sure that the joint is correctly threaded: Calculate the nominal distance: H = L - 25 mm (± 2 mm). Refer to the rating plate for the distance L. Measure the distance H and compare it to the nominal distance H. NOTE! When the joint is correctly threaded, 2 threads on the upper (60) and...
  • Page 33 Install the washers and nuts. Tighten the nuts in a crosswise sequence. Torque Please refer to the transformer documentation. Install the draw-rod nut (10): Apply a generous quantity of Molykote Multilub to the nut (10), and the threads of the draw rod. Install the washer (11) and nut (10) on the draw rod, tighten with your fingers.

  • Page 34: Installation Of The Bushing With The Fixed Bottom Contact

    4.4.5 Installation of the bushing with the fixed bottom contact Overview This procedure is only applicable for bushings with a fixed bottom contact. The fixed bottom contact is installed when it is delivered from Hitachi ABB Power Grids. CAUTION! Do not remove the fixed bottom contact.
  • Page 35 Procedure Lower the bushing into the transformer. CAUTION! Do not damage the stud bolts on the transformer. There is a risk of metal falling into the transformer. NOTE! Plastic sleeves put on two or three of the stud bolts will help to guide the flange, and will prevent damage to the stud bolts.

  • Page 36: Installation At Site

    Remove the bolts (6), the washers (7) and the lifting tool (1). End of instruction 4.5 Installation at site 4.5.1 Preparations at site Overview This procedure is only applicable if the lower draw rod with the bottom contact (36) is installed in the transformer.
  • Page 37 Procedure Loosen the M8 bolts (24). Remove the M10 bolts (6), and then remove the outer terminal (5). Install the lifting tool (1), refer to Installation of lifting tools, page 20. Place the lifting tool around the porcelain. Close the lifting tool. Install the bolts.
  • Page 38 Put the pull-through cord (12) through the box-spanner (13). Apply Molykote Multilube to the thread on the pull-through cord (12), and then connect it to the draw rod. NOTE! Or use a lubricant with equal properties to Molykote Multilube. Remove the M16 nut (10), and washer. With a soft cloth, carefully clean the bottom end of the bushing, and the inside of the center hole.

  • Page 39: Installation Of The Bushing On The Transformer At Site

    Pull down the upper draw rod (35) from the bottom end of the bushing. Remove the transport cover (45) from the transformer (46) and the lower draw rod (4). Lift the bushing to a position above the installation opening on the transformer. End of instruction 4.5.2 Installation of the bushing on the transformer at site Procedure...
  • Page 40 Connect the upper draw rod (35) to the lower draw rod (4). Make sure that the joint is correctly threaded: Measure the distance H and compare it to the nominal distance H. Calculate the nominal distance: H = L - 25 mm (± 2 mm). Refer to the rating plate for the distance L.
  • Page 41 Hold the pull-through cord (12) in tension, while lowering the bushing onto the transformer. CAUTION! Do not damage the stud bolts. There is a risk of metal falling into the transformer. NOTE! Plastic sleeves put on two or three of the stud bolts will help to guide the flange, and will prevent damage to the stud bolts.
  • Page 42 Tighten the draw-rod nut (10). NOTE! Make sure that more than 10 mm of the threads on the upper draw rod (35) is remaining. Torque 10 Nm Remove the bolts (6), washers (7) and lifting tool (1). Remove the pull-through cord (12). Tighten the draw-rod nut, refer to Hydraulic tightening of the draw-rod nut, page 45.
  • Page 43 4.5.3 Installation of the bushing with the fixed bottom contact Overview This procedure is only applicable for bushings with a fixed bottom contact. The fixed bottom contact is installed when it is delivered from Hitachi ABB Power Grids. CAUTION! Do not remove the fixed bottom contact.
  • Page 44 Install the winding cables to the fixed bottom contact. CAUTION! Make sure that there is no tension in the winding cables. Tension in the winding cables will cause damage to the cables. Install the washers and nuts. Tighten the nuts in a crosswise sequence.

  • Page 45: Hydraulic Tightening Of The Draw-Rod Nut

    4.6 Hydraulic tightening of the draw-rod nut Overview Draw rod nut Hydraulic jack Procedure Measure the distance (a). Measuring is performed when the draw rod nut is tightened with torque 10 Nm. NOTE! The bushing is delivered with an information sheet that specifies the draw-rod extension (b-a).
  • Page 46 Install the shaft (37) on the draw rod (35), and put the box-spanner (13) on the shaft (37). Make sure that more than 10 mm of the threads on the upper draw rod (35) are used. Put the hydraulic jack (38) on the shaft (37), and install the nut (44), tighten by hand.
  • Page 47 (b) minus (a). Compare the calculated value (b-a) with the dimension in the table. NOTE! Record the values in Measurement record, page 83, for future reference. Type Extension GOE 2600 24.0 mm ±2.0 Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...
  • Page 48 When installing the bushing at site: Measure the values (X1) and (c). Record the values in Measurement record, page 83, for future reference. Keep the document with the substation documentation. End of instruction Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...

  • Page 49: Minimum Oil-Level In Transformer

    4.7 Minimum oil-level in transformer Oil spillage Oil spillages that are not removed can be misstaken for oil-leakage at a later time, it is thus important to remove them. Procedure Make sure that the transformer oil-level is maximum 30 mm from the lower side of the bushing flange.
  • Page 50 Prepare the contact surface (47), gasket surface (87) and O-ring (3): Carefully clean the contact surface and gasket surface with a soft cloth. Apply Vaseline to the contact surface. Apply Mobilgrease 28 to the gasket surface and O-ring (3). CAUTION! Do not use a wire brush on the tin/zinc coating on aluminium outer-terminals.
  • Page 51 Apply Molykote Multilub to the M10 bolts (6). Install the M10 bolts (6) and plain washers (7). Tighten the M10 bolts (6) in a crosswise sequence. CAUTION! Make sure that the outer terminal moves straight down. Turn each bolt a little, and then the next bolt, until all bolts can be tightened to the correct torque.

  • Page 52: Grounding Of The Bushing Flange

    4.9 Grounding of the bushing flange Overview The bushing flange must be grounded to the transformer tank. This prevents electrical discharge between the bushing flange and the transformer tank under normal service conditions. DANGER! Make sure that the grounding is correct. An unsatisfactory grounding can cause damage to equipment, or death to personnel.

  • Page 53: Commissioning

    5 Commissioning 5.1 Waiting time before energization General requirements for the bushing • If the bushing has been stored in the vertical position with the top end upwards, then no waiting time is required. • If the bushing has been stored in an inclined position of 7°, required waiting time in the vertical position is 24 hours.

  • Page 54: Recommended Test Before Energization

    Different methods can be used, and Hitachi ABB Power Grids refers to the instructions given by the company responsible for the field erection of the bushing.

  • Page 55: Measurement Of Capacitance And Dissipation Factor

    Thus, it is important to measure and record the capacitance (C ) for future reference, such as repairs, service etc. Type Nominal capacitance (pF) ±10% * ±50% GOE 2600 6000 * Reference values from Hitachi ABB Power Grids. Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...
  • Page 56 Dissipation factor, tan δ The dissipation factor varies with the temperature of the bushing core, and thus the measured dissipation factor must be multiplied with the correction factor given below. Bushing core temperature °C Correction factor to 20 °C (IEC) 0.80 0.85 8-12...
  • Page 57 Connect the measuring equipment. Connect the low voltage cable to the stud (57). Connect the high voltage cable to the outer terminal. Connect the ground cable to the bushing flange (65). Measure the capacitance (C ) between the outer terminal and the stud (57). •...

  • Page 58: Measurement Of Through-Resistance

    5.2.5 Measurement of through-resistance Overview The method to use for measuring the through-resistance depends on the design of the transformer. In general, a current is applied from bushing to bushing. The voltage drop from the outer terminal to outer terminal is measured.

  • Page 59: Maintenance

    6 Maintenance 6.1 Recommended maintenance General The bushings are maintenance free, no regular maintenance is necessary. DANGER! Risk of electrocution! Do not go near the bushing while it is energized, or ungrounded. High voltages can kill you. Make sure that the bushing is de-energized, and grounded before you do work on it. Cleaning of the insulator surface If the insulator is exposed to very high pollution, it can be necessary to clean the surface.
  • Page 60 Make a visual inspection for oil leakage during regular station supervision. After repairs Hitachi ABB Power Grids recommends that the capacitance is measured after repairs have been done, after maintenance of connected equipment, or after work near the bushing is completed.

  • Page 61: Checking The Oil-Level

    If the oil-level is in the red area, fill the bushing with clean and dry transformer oil. Please contact Hitachi ABB Power Grids for the correct oil-level. Oil-filling is only allowed when the temperature of the bushing is between +5 °C and +35 °C.

  • Page 62: Taking Oil Samples

    Remove the cover (58) and oil-plug (9). Fill the bushing with transformer oil to the correct oil-level. For more information, contact Hitachi ABB Power Grids. Install and tighten the oil-plug (9). Use a new gasket (77), article number: 1ZSC001591-AAC.
  • Page 63 Procedure Put a container under the oil valve (51) to collect oil-spills. CAUTION! If transformer oil spills, clean the are immediately. A wet surface is dangerous and can cause you to fall. Connect the end of a hose to a nipple, and then connect the nipple to the oil valve (51) on the flange. NOTE! The thread on the oil valve is (R ½") BSPT ½".
  • Page 64 Wait before energizing the bushing: • If bubbles where not introduced into the transformer oil, wait one hour. • If bubbles where introduced into the transformer oil, wait 12 hours. CAUTION! Flashovers and partial discharges can form in the bubbles, this can cause damage to the bushing.

  • Page 65: Re-Packing

    The terminal on the pull-through cord (12) has M8 threads. NOTE! Hitachi ABB Power Grids recommends that the hydraulic jack is used for the removal of the lower draw rod, refer to Removal of the lower draw rod with bottom contact from the bushing , page steps 1 through 8.
  • Page 66 Remove the M16 nut (10) on the draw rod with the box spanner (13). Remove the nuts and washers. Lift the bushing from the transformer. CAUTION! Do not damage the stud bolts, there is a risk of metal falling into the transformer.
  • Page 67 Disassemble the draw rod at the lower joint (39). Use the key grip on the lower draw rod. DANGER! Make sure that the upper draw rod does not fall down when the lower joint (39) is disassembled. CAUTION! Do not disassemble the joint (60), this increases the risk of incorrect assembly.

  • Page 68: Removal Of The Bushing From The Transformer, Fixed Bottom Contact

    Lower the bushing to the floor. CAUTION! Make sure that there are support blocks on the floor. Remove the lifting tool, refer to Installation of lifting tools, page 20. Pull out the upper draw rod (35) and support tubes (80) by hand. CAUTION! Be careful when pulling out the draw rod.
  • Page 69 Remove the nuts and washers. Remove the winding cables from the fixed bottom contact. Lift the bushing from the transformer. CAUTION! Do not damage the stud bolts, there is a risk of metal falling into the transformer. Installation and commissioning guide 1ZSC000563-AAF EN, REV.
  • Page 70 Lift the bushing to a position above the floor and turn the bushing to a horizontal position. Install the lifting tool (88) to the flange. Install soft lifting slings from the lifting tool (88) to a second crane. Lower the upper part of the bushing. Stop when the bushing is in a horizontal position.

  • Page 71: Re-Packing Of The Bushing

    7.3 Re-packing of the bushing Overview Procedure Put plastic wrap on the draw rod, and fix it to the transport box. CAUTION! Do not put the draw rod into the bushing, the threads on the draw rod will scratch the inside of the center-tube.
  • Page 72 Remove the lifting tool (88). Attach the bushing to the transport box in the same way as when it was delivered. CAUTION! Make sure that the bushing cannot move or rotate in the transport box. Close the transport box. NOTE! Refer to Lifting the transport box, page and Transportation, page 13.

  • Page 73: Spare Parts And Special Tools

    8 Spare parts and special tools 8.1 Summary If the bushing is damaged, we recommend that it is returned to Hitachi ABB Power Grids for repairs and re-testing. Some parts that are damaged or lost during transportation or installation can be ordered from Hitachi ABB Power Grids.
  • Page 74 Oil-plug 2522 731-A Position Part Article number Note Oil-plug 2121 738-18 Gasket 1ZSC001591-AAC Cover for oil-plug 2522 731-A This cover gives protection to the oil-plug 2522 731-A. Position Part Article number Note Cover 2522 732-42 Gasket 2152 795-67 Installation and commissioning guide 1ZSC000563-AAF EN, REV.

  • Page 75: Special Tools

    8.3 Special tools Lifting tool Position Part Article number Note Lifting tool PDV1909-1 Tie bolts Position Part Article number Note Lifting tool PDV1909-2 Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...
  • Page 76 Position Part Article number Note Lifting yoke PDV1909-4 Pull-through cord Position Part Article number Note Pull-through cord 9760 669-A With M8-terminal. Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...
  • Page 77 Hydraulic jack Position Part Article number Note Hydraulic jack 9769 897-A For removal, and installation of the draw-rod system. Box-spanner Position Part Article number Note Box-spanner 9760 669-B Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...
  • Page 78 Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...

  • Page 79: Disposal And Environmental Information

    9.2 Disposal and recycling Hitachi ABB Power Grids 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 striven for, and consideration is taken to the materials' environmental impact and recycling alternatives.
  • Page 80 Many metal components of iron, steel and aluminum are large and easy to identify, e.g. support structures. Hitachi ABB Power Grids strives to reduce the use of precious metals and the release of environmentally hazardous metals.

  • Page 81: References

    10 References 10.1 Summary • Markings: Conforming to IEC/IEEE. • Bushing diagnostics and conditioning, 2750 515-142. • Test adapter, Technical guide, 1ZSC000563-ACS. • Test adapter, Installation and maintenance guide, 1ZSC000563-ACD. • Transformer oil, IEC 60296 Ed (2020), Type A, TVAI. Installation and commissioning guide 1ZSC000563-AAF EN, REV.
  • Page 82 Installation and commissioning guide 1ZSC000563-AAF EN, REV. 4, 2021-06-23...

  • Page 83: Appendix

    11 Appendix 11.1 Measurement record Overview Record the final measurements of the draw rod. Record Serial number Date Operator     H (mm) c (mm) X1 (mm) Ø (mm) a (mm) b (mm)     Thread diameter. Draw-rod nut tightened with 10 Nm. After hydraulic tightening.
  • Page 84 Hitachi ABB Power Grids Sweden, Components SE-771 80 Ludvika, Sweden www.hitachiabb-powergrids.com/transformer-insulation-components © Copyright 2021 Hitachi ABB Power Grids, All rights reserved. Specifications subject to change without notice.

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