ABB GOE(2) Installation And Commissioning Manual
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ABB GOE(2) Installation And Commissioning Manual

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1ZSC000563-ACF EN, REV. A, 2020-06-25
Transformer bushing, type GOE(2)
Installation and commissioning guide

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Summary of Contents for ABB GOE(2)

  • Page 1 1ZSC000563-ACF EN, REV. A, 2020-06-25 Transformer bushing, type GOE(2) 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 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.

  • Page 3: Table Of Contents

    Contents 1   Safety 1.1   Levels of safety risks ................................... 5 1.2   Hazardous working situations ..............................6 1.3   Safety precautions..................................6 1.4   Competence level..................................6   2   Product description 2.1   Design ......................................7 2.2   Technical specification.................................
  • Page 4   5   Commissioning 5.1   Waiting time before energization ..............................51 5.2   Recommended test before energization ............................. 52 5.2.1   Overview ................................... 52 5.2.2   Tightness test between transformer and bushing flange................... 52 5.2.3   Tightness test of bushing outer terminal........................52 5.2.4  ...

  • 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(2) is a capacitance graded oil impregnated paper bushing made for immersed oil/air service. For a detailed description, please refer to the Technical guide, 1ZSE 2750-105. General schematics Oil plug Oil-level gauge Oil sampling valve ¼” Mounting flange Top housing Porcelain insulator, air side...
  • Page 8 Terminal system The bushing can be configured with one of two terminal systems: the draw-lead system, or the draw-rod system. The draw-rod system can be configured with a small, or a large bottom contact. Terminal system Option Draw-lead system Draw-rod system Small bottom contact Large bottom contact Draw-lead system...
  • Page 9 Draw-rod system The draw rod can be configured with an optional joint (53) to fit transformers with short bushing turrets. The bottom-contact joint (56) is locked with threadlocking fluid as standard. The bushing has draw rod with one upper joint (52), it is always locked with threadlocking fluid. All joints must be locked with threadlocking fluid when the bushing is in operation at site.
  • Page 10 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. The maximum one minute test voltage for this test tap is 20 kV .

  • Page 11: Technical Specification

    In the axial direction, the bushing can withstand a static load of 20 kN. NOTE! The loads described in this section are static loads, for dynamic loads such as earthquakes and extreme wheather conditions, please contact your ABB sales representative. Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...
  • Page 12 Maximum cantilever load at installation angle 0° Maximum cantilever load at installation angle 30° Maximum axial static load Load applied at the midpoint   Type Test load 1 minute Maximum cantilever load in operation Maximum axial at installation angle (N) static load (N) 0°...

  • 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 ABB in a transport box, and the bushing is held in place by support blocks and fiberboard 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 NOTE! If the outer terminal is not installed, please contact ABB. Carefully lift the bushing. Make sure that the support blocks are in the same positions as the support blocks in the transport box.

  • Page 17: Installation

    For removal, and installation of the bottom contact. Draw-rod system. Tackle For installation of the bushing at a specific angle. 4.2 Consumables Item Brand ABB part Note number Oil based Vaseline Fuchs For treatment of contact surfases. Does not react with transformer oil. Mobilgrease 28...

  • Page 18: Preparations

    4.3 Preparations 4.3.1 Installation of lifting tools Overview Lifting tool Soft bedding, e.g. rubber mat or woodboard Shackle Procedure Loosen the M8 bolts (24). NOTE! It is not necessary to remove the M8 bolts. Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...
  • Page 19 Remove the M10 bolts (6) and washers (7), and then remove the outer terminal (5). NOTE! Keep the outer terminal (5), washers (7) and bolts (6), they will be used again. If the bushing has the draw-lead system, remove the divided ring (80) and the inner terminal (32). Install the lifting tool (1), the M10 bolts (6) and the washers (7).

  • Page 20: Lifting The Bushing For Installation On The Transformer

    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 crane hook with the lifting tool (1) on the bushing. Attach soft lifting slings (8) from the lifting holes, through the lifting tool to the crane hook.

  • Page 21: Installation With Draw Lead

    4.4 Installation with draw lead 4.4.1 Installation with draw lead Overview Draw lead Pull-through cord Inner terminal Bushing Procedure Braze the draw lead (2) from the transformer windings to the inner terminal (32). Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...
  • Page 22 Carefully clean the oil-side of the bushing, and the inside of the center hole. Look for damage. Install the springs (15), the guiding sleeves (16), the pressing ring (17), and the M8 hex screws (18) to the bottom end of the bushing. Torque 40 Nm Install the end shield:...
  • Page 23 Lower the pull-through cord (12) through the bushing. Apply Molykote Multilub to the pull-through cord (12), and attach it to the inner terminal (32). NOTE! The terminal (32) has M8 threads. Hold the pull-through cord (12) in tension, while lowering the bushing onto the transformer. CAUTION! Do not damage the stud bolts on the transformer.
  • Page 24 Install the nuts and washers. Tighten the nuts in a crosswise sequence. CAUTION! Make sure that the nuts are tightened evenly. First tighten all nuts to half the torque, then to the full torque. Torque Please refer to the transformer manufacturer.

  • Page 25: Installation With Draw Rod At Transformer Factory

    4.5.1 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 ABB, the first step at the transformer factory is thus to remove it.
  • Page 26 Procedure Install the shaft (37) of the hydraulic jack 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) is used by the shaft (37).
  • Page 27 Loosen the draw rod nut (10): Pull the draw rod with 40 kN. Carefully increase the force until the draw rod nut can be loosened by hand. If 45 kN is reached, and the draw rod nut is not loose, turn the box-spanner with a wrench.
  • Page 28 Apply Molykote Multilub to the threads on the pull-through cord (12), then connect it to the upper draw rod. NOTE! The terminal on the pull-through cord (12) has M8 threads. NOTE! Or use a lubricant with equal properties to Molykote Multilub. Remove the draw rod nut (10).

  • Page 29: Installation Of The Small Bottom Contact In The Transformer

    4.5.2 Installation of the small bottom contact in the transformer Overview Small bottom contact 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.

  • Page 30: Installation Of The Large Bottom Contact In The Transformer

    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 bottom contact. Torque 68 ±6 Nm Lift the bushing above the opening in the transformer. Continue with Installation of the bushing on the transformer, page 32.
  • Page 31 Procedure Install the springs (15), the guiding sleeves (16), the pressing ring (17), and the hex screws (18) to the top of the bottom contact. Torque 40 Nm Install the winding cables to the bottom contact. CAUTION! Make sure that there is no tension in the winding cables.

  • Page 32: 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 ABB. Procedure Connect the upper draw rod (35) to the lower draw rod (4).
  • Page 33 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 34 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 35: Installation With Draw Rod At Site

    Remove the bolts (6), the washers (7) and the lifting tool (1). Tighten the draw-rod nut, refer to Hydraulic tightening of the draw-rod nut, page 42, or Manual tightening of the draw-rod nut, page 45. End of instruction 4.6 Installation with draw rod at site 4.6.1 Preparations at site Overview This procedure is only applicable if the lower draw rod with the bottom contact (36) is installed in the...
  • Page 36 Procedure Loosen the M8 bolts (24). Remove the M10 bolts (6), and then remove the outer terminal (5). Install the lifting tool (1), the M10 bolts (6) and the washers (7). Torque 40 ±4 Nm Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...
  • Page 37 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 38: 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 4.6.2 Installation of the bushing on the transformer at site Procedure...
  • Page 39 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 40 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 41 Tighten the draw-rod nut (10). 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 42, or Manual tightening of the draw-rod nut, page 45. End of instruction Installation and commissioning guide 1ZSC000563-ACF EN, REV.

  • Page 42: Hydraulic Tightening Of The Draw-Rod Nut

    4.7 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 43 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) but do not tighten it.
  • Page 44 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. Make sure that the draw-rod extension is within the tolerances: Measure the distance (b). Calculate the extension of the draw rod: (b) minus (a).

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

    If possible, ABB recommends that the draw rod is hydraulically tightened, refer to Hydraulic tightening of the draw-rod nut, page 42.

  • Page 46: Minimum Oil-Level In Transformer

    4.9 Minimum oil-level in transformer Procedure Make sure that the transformer oil-level is maximum 30 mm from the lower side of the bushing flange. CAUTION! A lower oil-level will reduce the electrical insulation. End of instruction 4.10 Installation of the outer terminal Procedure Prepare the contact surface (47) and gasket surface (87):...
  • Page 47 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 48 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 49: Grounding Of The Bushing Flange

    4.11 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. There are two alternatives. DANGER! Make sure that the grounding is correct. An unsatisfactory grounding can cause damage to equipment, or death to personnel.
  • Page 50 Apply a large quantity of Mobilgrease 28 to the bolt (50). CAUTION! The quality of the bolt is important, stainless steel of A4-80 quality is recommended. NOTE! Or use a lubricant similar to Mobilgrease 28. Install the bolt (50). Torque M12: 40 Nm Connect the other end of the flexible cable (64) to the transformer.

  • Page 51: 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 52: Recommended Test Before Energization

    Water could enter directly into the transformer insulation. It is thus recommended to do a tightness test after installation of the bushing, both with vacuum and pressure. Different methods can be used, and ABB refers to the instructions given by the company responsible for the field erection of the bushing.

  • Page 53: Measurement Of Capacitance And Dissipation Factor

    Space for CT = 300 mm Space for CT = 600 mm GOE(2) 1175 1500 GOE(2) 1425 GOE(2) 1550 1000 1500 GOE(2) 1675 1000 1500 * Reference values from ABB Components. Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...
  • Page 54 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 55 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 56: 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 57: 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. NOTE! For bushings with oil-level indicator, it is recommended to check the oil-level at plant supervision.
  • Page 58 Measurement of capacitance and dissipation factor Please refer to Measurement of capacitance and dissipation factor, page 53. Thermovision (infrared camera) check for local overheating on connectors At the maximum rated current, the bushing outer terminal normally operates at a temperature of about +35 °C to +45 °C above the ambient temperature.

  • Page 59: Checking The Oil-Level

    The oil-level at normal and high temperatures, must always be above the red area on the oil-level indicator. If the oil-level is in the red area, fill the bushing with clean and dry transformer oil. Please contact ABB for the correct oil-level. Oil-filling is only allowed when the temperature of the bushing is between +5 °C and +35 °C.

  • Page 60: Taking Oil Samples

    If the oil-level is low, fill the bushing with transformer oil. Remove the oil-plug (9). Fill the bushing with transformer oil to the correct oil-level. For more information, contact ABB. Install and tighten the oil-plug (9). Use a new gasket, article number: 1ZSC001591-AAC. DANGER!
  • Page 61 Procedure for bushings with oil valve 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. Remove the cover (89). CAUTION! Make sure that the oil valve does not rotate.
  • Page 62 Check the oil-level. If the oil-level is low, refer to Checking the oil-level, page 59. CAUTION! The oil-level must be above the red area (29). NOTE! It is generally not necessary to fill the bushing with oil after an oil sample is taken.

  • Page 63: Re-Packing

    NOTE! The terminal on the pull-through cord (12) has M8 threads. NOTE! ABB Components 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 64 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 65 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 66 Pull out the upper draw rod (35) and support tubes (80) by hand. CAUTION! Be careful when pulling out the draw rod. The bushings inside can easily be damaged. Install the lower draw rod (4) in the transport cover (45). Install the transport cover (45) on the transformer turret (46).

  • Page 67: Re-Packing Of The Bushing

    7.2 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 68 Close the transport box. NOTE! Refer to Lifting the transport box, page and Transportation, page 13. End of instruction Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...

  • Page 69: Spare Parts

    8 Spare parts 8.1 Summary If the bushing is damaged, we recommend that it is returned to ABB for repairs and re-testing. Some parts that are damaged or lost during transportation or installation can be ordered from ABB. 8.2 Spare parts Cover For the test tap.

  • Page 70: Special Tools

    Oil-plug 2522 731-A Position Part Article number Note Oil-plug 2121 738-18 Gasket 1ZSC001591-AAC 8.3 Special tools Lifting tool Position Part Article number Note Lifting tool 9760 668-C Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...
  • Page 71 Pull-through cord Position Part Article number Note Pull-through cord 9760 669-A With M8-terminal. Hydraulic jack Position Part Article number Note Hydraulic jack 9769 897-A For removal, and installation of the bottom contact. Draw-rod system. Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...
  • Page 72 Box-spanner Position Part Article number Note Box-spanner 9760 669-B Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...

  • Page 73: Disposal And Environmental Information

    9.2 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 striven for, and consideration is taken to the materials' environmental impact and recycling alternatives.
  • Page 74 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.

  • Page 75: 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, class 2. Installation and commissioning guide 1ZSC000563-ACF EN, REV.
  • Page 76 Installation and commissioning guide 1ZSC000563-ACF EN, REV. A, 2020-06-25...

  • Page 77: Appendix

    11 Appendix 11.1 Measurement record Overview Record the final measurements of the draw rod. Record Serial number Date Operator     a (mm) b (mm) Draw-rod nut tightened with 10 Nm. After hydraulic tightening. Comments            ...
  • Page 80 ABB Power Grids Sweden AB, Components SE-771 80 Ludvika, Sweden www.abb.com/transformercomponents © Copyright 2020 ABB, All rights reserved. Specifications subject to change without notice.

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