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Installation and commissioning guide

2750 515-1 EN, REV. 14, 2020-06-26

4.12 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.

Procedure with a cone point set screw

1.

Apply a large quantity of Mobilgrease 28 to the
cone point set screw (50).

CAUTION!

The quality of the cone point set screw
is important, stainless steel of A4-80
quality is recommended.

NOTE!

Or use a lubricant similar to
Mobilgrease 28.

G005044

2.

Install the cone point set screw (50).

NOTE!

The cone point of the set screw
penetrates the paint. This makes an
electrical connection between the
bushing and the transformer tank,
keeping them at the same potential.

Torque

M12: 40 Nm

End of instruction

Procedure with a flexible cable

1.

Clean the contact surfaces.

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Summary of Contents for GOE 1050

Page 1: ...2750 515 1 EN REV 14 2020 06 26 Transformer bushing type GOE 250 to 2550 Installation and commissioning guide ...

Page 2: ...or 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 ...

Page 3: ... 4 Horizontal installation of the bushing on the transformer 24 4 5 Installation with draw lead 26 4 5 1 Calculation of the length of the draw lead 26 4 5 2 Installation with draw lead 27 4 6 Installation with draw rod at transformer factory 32 4 6 1 Removal of the lower draw rod with bottom contact from the bushing 32 4 6 2 Installation of the small bottom contact N1 4 in the transformer 35 4 6 3...

Page 4: ...or 63 5 2 5 Measurement of through resistance 66 6 Maintenance 67 6 1 Recommended maintenance 67 6 2 Checking the oil level 69 6 3 Taking oil samples 70 7 Re packing 73 7 1 Removal of the bushing from the transformer draw rod 73 7 2 Removal of horizontally installed bushings 76 7 3 Re packing of the bushing 78 8 Spare parts and special tools 79 8 1 Summary 79 8 Spare parts 79 8 Special tools 81 9 ...

Page 5: ...duct 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 entai...

Page 6: ...heavy objects Do not walk under lifted objects Make sure that heavy objects are stable before starting work 1 3 Safety precautions Precaution Action Transformer oil Collect used transformer oil in drums Transformer oil is dangerous Fumes from hot oil can cause irritation to the respiratory organs and the eyes Long and repeated contact with transformer oil can cause damage to your skin Waste and cl...

Page 7: ...oil air service For a detailed description please refer to the Technical guide 1ZSE 2750 105 General schematics G006916 9 Oil plug 25 Sight glass GOE 250 to 950 26 Oil level gauge GOE 1050 to 2550 51 Oil sampling valve 65 Mounting flange 68 Top housing 69 Porcelain insulator air side 70 Test tap 71 Extension for current transformer 72 Porcelain insulator oil side 73 Bottom nut 74 Lifting eye ...

Page 8: ...e 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 G004488 A Draw lead system B Draw rod system with small bottom contact N1 4 C Draw rod system with large bottom contact N1 6 2 Draw lead 32 Inner terminal 35 Draw rod 40 Small bottom contact N1 4 41 Large bottom contact N1 6 ...

Page 9: ...r joints 52 they are always locked with threadlocking fluid All joints must be locked with threadlocking fluid when the bushing is in operation at site G006279 39 Lower joint at flange level 52 Upper joint only on large bushings 53 Additional joint option 54 Thread is locked with threadlocking fluid 55 Thread is NOT locked with threadlocking fluid 56 Bottom contact joint locked with threadlocking ...

Page 10: ...st be fully filled with oil there is no expansion space for the oil the oil must flow freely to and from the transformer tank through an oil passage 42 The bushing is delivered with expansion space for the oil and the bushing must be filled at installation When the bushing is delivered the oil passage 42 is covered with a covering plate 27 and a rubber gasket This configuration makes sure that it ...

Page 11: ...age for this test tap is 20 kVrms The test tap can be used as a power source if it is connected to an external capacitance The operating voltage is limited to 6 kV CAUTION Do not energize the bushing without a test adapter or the cover installed The bushing is grounded through the cover to prevent damage to the bushing G006914 3 O ring 57 Stud 58 Cover 59 Grounding spring Test adapter 2769 522 C o...

Page 12: ...ximum temporary oil temperature at short time overload 115 C Oil level in transformer Not lower than 30 mm from the bushing flange Maximum pressure of medium pg 100 kPa pg relative to ambient pressure Angle of installation 0 to 60 from vertical GOE 1300 1425 and 2550 1675 0 to 30 Test tap Test tap with 8 mm male contact pin According to IEEE type A Conductor Center tube conductor or draw lead Mark...

Page 13: ...Maximum cantilever load in operation at installation angle N Maximum axial static load N 0 30 60 GOE 250 380 650 5700 2800 2300 1700 20000 GOE 950 5000 2500 2000 1500 20000 GOE 1050 13000 6500 4300 3100 20000 GOE 1175 12000 6000 4300 3100 20000 GOE 1300 1425 9000 4500 2500 20000 GOE 1550 1675 1800 13000 6500 4300 1500 20000 GOE 2550 1600 13000 6500 3700 1600 20000 GOE 2550 1675 12200 6100 2900 200...

Page 14: ...14 Installation and commissioning guide 2750 515 1 EN REV 14 2020 06 26 ...

Page 15: ...t shown correctly when the bushing is in the horizontal position 3 2 Transportation The bushing must be transported in the transport box The bushing must be transported in the horizontal position Carefully inspect the bushing for damage after transportation 3 3 Storage Short term storage less than 6 months The bushing can be stored outdoors if it is in the transport box Keep the transport box prot...

Page 16: ... position with the top end upwards and put it in a safe stand 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 The transport box is marked with Top end this identifies the ...

Page 17: ...ing slings 8 3 Make sure that the angle of the soft lifting sling is not more than 20 4 Carefully lift the transport box 5 Set down the transport box on a flat surface End of instruction 3 4 2 Lifting the bushing out of the transport box Overview G005004 79 Top end nut Procedure 1 Make sure that the crane is approved for lifting the weight of the bushing Refer to the net weight on the packing list...

Page 18: ... sling to the top part of the bushing and the lower part of the outer terminal 5 CAUTION Attach the soft lifting sling as close to the top housing as possible or damage will occur NOTE If the outer terminal is not installed please contact ABB G004689 6 Carefully lift the bushing 7 Make sure that the support blocks are in the same positions as the support blocks in the transport box CAUTION Do not ...

Page 19: ...ial GOE bushings Hydraulic jack 9769 897 A For removal and installation of the bottom contact Draw rod system Box spanner 9760 669 B 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 number Note Oil based Vaseline Fuchs For treatment of contact surfases Does not react with transformer oi...

Page 20: ...4 3 1 Lifting the bushing Overview G005005 1 Lifting tool 30 Soft bedding e g rubber mat or woodboard 31 Shackle Procedure 1 Make sure that the crane can lift the bushing Refer to net weight in the packing list 2 Loosen the M8 bolts 24 NOTE It is not necessary to remove the M8 bolts G004684 ...

Page 21: ...to 950 align the side of the lifting tool with the oil level glasses 25 For GOE 1050 to 2550 align the side of the lifting tool with the oil level guage 26 NOTE The lifting tool is thinner than the outer terminal use stacks of washers or shorter bolts to correctly install the lifting tool G005056 Torque 40 4 Nm 5 Attach soft lifting slings 8 from the lifting holes through the lifting tool to the c...

Page 22: ...to bushings that will be oil filled with an atmospheric process This procedure does NOT apply when the bushing will be oil filled with the vacuum process refer to Horizontal installation of the bushing on the transformer page 24 This procedure must be done immediately before installation of the bushing on the transformer because there is no expansion space for the oil after this procedure is compl...

Page 23: ...he oil plug 9 G006353 4 Add clean and dry transformer oil until the bushing is completely filled CAUTION Make sure that the bushing is completely full of transformer oil Air left in the bushing can cause damage 5 Install the oil plug 9 6 Lower the bushing to the horizontal position 7 Install the bushing in the transformer immediately refer to Horizontal installation of the bushing on the transform...

Page 24: ...re 1 Install the springs 15 the guiding sleeves 16 the pressing ring 17 and the hex screws 18 to the bottom contact G006299 2 Remove the covering plate 27 G003036 3 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 G006296 Torque Please refer to the transformer...

Page 25: ...olts 6 to attach the outer terminal 5 G006297 5 Put the winding cables through the end shield G005024 6 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 7 Install the end shield 1 Push the end shield carefully against the pressing ring 17 2 Turn the end shield appr...

Page 26: ... in the length of the porcelain a nominal lenght for the draw lead can not be given The actual distance between the inner terminal and the sealing surface of the flange must be calculated G000379 Procedure 1 Measure the length L2 2 Subtract 350 mm from the L2 measurement L2 350 draw lead lenght from the flange CAUTION Make sure that the draw lead is sufficiently long End of instruction ...

Page 27: ... 515 1 EN REV 14 2020 06 26 27 4 5 2 Installation with draw lead Overview G004512 2 Draw lead 12 Pull through cord 32 Inner terminal 33 Bushing Procedure 1 1 Remove the inner terminal 32 from the bushing 2 Remove the nut 19 and washers G006520 ...

Page 28: ...nside of the center hole Look for damage 4 Install the springs 15 the guiding sleeves 16 the pressing ring 17 and the hex screws 18 to the bottom end of the bushing G005016 Torque 40 Nm 5 Install the end shield 1 Push the end shield carefully against the pressing ring 17 until the hex screw heads come through the holes in the end shield 2 Turn the end shield clockwise approximately 20 to its locke...

Page 29: ...CAUTION Make sure that the washers are in the correct order G004515 19 Nut 20 Plain washer 21 Conical spring washer 22 Contact washer 7 Lower the pull through cord 12 through the bushing G001893 8 Apply Molykote Multilub to the pull through cord 12 and attach it to the inner terminal 32 NOTE The terminal 32 has M8 threads G004516 ...

Page 30: ... G006853 10 If necessary adjust the length of the inner terminal 1 Lift the bushing from the transfomer and lower the inner terminal with the pull through cord 2 Remove the screws 34 with spring washers 34 3 Move the lower part 14 4 Apply Molykote Multilub to the threads of the screws 34 and install the screws 34 with spring washers Both screws should be used CAUTION Make sure that there is no ten...

Page 31: ...que G005043 Torque Please refer to the transformer manufacturer 13 Install the inner terminal 1 Apply Molykote Multilub on the threads of the nut 19 2 Install the washers and the nut 19 3 Remove the pull through cord 4 Tighten the nut 19 NOTE The guide pins 23 fit the holes in the top tube G005051 Torque 80 Nm 14 Remove the M10 bolts 6 the washers 7 and the lifting tool 1 G004679 15 Continue with ...

Page 32: ...ontact 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 G005052 4 Lower draw rod 33 Bushing 35 Upper draw rod 36 Bottom contact Procedure 1 Install the shaft 37 of the hydraulic jack on the draw rod 35 and put the box spanner 13 on the shaft 37 G004873 ...

Page 33: ... rod cannot be released when the draw rod nut is loosened G005147 4 Loosen the draw rod nut 10 1 Pull the draw rod with 40 kN 2 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 Refer to the instructions for the hydraulic jack DANGER Apply the hydraulic pressure carefully Incorrectly ...

Page 34: ...ove the shaft socket from the upper draw rod 35 7 Remove the hydraulic jack 38 from the bushing G005068 8 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 G004686 ...

Page 35: ... the lower joint 39 NOTE The upper thread 60 is locked with thread locking fluid grade 42 NOTE As standard the thread joint 56 between the draw rod and the bottom contact is locked with thread locking fluid grade 42 The guiding cone 62 is loose G005033 11 Carefully look for damage at the bottom end of the bushing and the inside of the center hole End of instruction 4 6 2 Installation of the small ...

Page 36: ...8 to the bottom end of the bushing G005016 Torque 40 Nm 2 Put the winding cables through the end shield G005024 3 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 G005036 Torque 68 6 Nm 4 Lift the bushing above the opening in the transformer ...

Page 37: ... 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 For installation on the bottom nut refer to Installation of the small bottom contact in the transformer page 35 G005017 41 Large bottom contact Procedure 1 Install the springs 15 the guiding sleeves 16 the pressing ring 17 and the hex screws 18 to ...

Page 38: ...Tension in the winding cables will cause damage to the bottom contact G005019 Torque 68 6 Nm 3 Install the end shield 1 Push the end shield carefully against the pressing ring 17 until the hex screw heads come through the holes in the end shield 2 Turn the end shield approximately 20 to its locked position G005037 4 Lift the bushing above the opening on the transformer End of instruction ...

Page 39: ...ormer Overview It is important to install the draw rod correctly thus the ends of the draw rod parts must make contact at 67 G006788 CAUTION Do not disassemble the joints 52 these are correctly assembled and locked with tread locking fluid by ABB Procedure 1 Connect the upper draw rod 35 to the lower draw rod 4 G005038 ...

Page 40: ...shing has the small bottom contact then install the end shield 1 Push the end shield carefully against the pressing ring 17 until the hex screw heads comes through the holes in the end shield 2 Turn the end shield approximately 20 to its locked position G005039 4 Hold the pull through cord 12 in tension while mounting the bushing into the transformer CAUTION Do not damage the stud bolts on the tra...

Page 41: ...3 Torque Please refer to the transformer documentation 7 Install the draw rod nut 10 1 Apply a generous quantity of Molykote Multilub to the nut 10 and the threads of the draw rod 2 Install the washer 11 and nut 10 on the draw rod tighten with your fingers 3 Remove excess Molykote Multilub with a rag CAUTION If the nut 10 is not lubricated correctly it will not be tighten to the correct torque Thi...

Page 42: ...10 mm of the threads on the upper draw rod 35 is remaining G006663 Torque 10 Nm 9 Remove the pull through cord 12 10 Remove the bolts 6 the washers 7 and the lifting tool 1 G004679 11 Tighten the draw rod nut refer to Hydraulic tightening of the draw rod nut page 49 or Manual tightening of the draw rod nut page 53 End of instruction ...

Page 43: ...ith draw rod at site 4 7 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 G004532 Procedure 1 Loosen the M8 bolts 24 G004684 2 Remove the M10 bolts 6 and then remove the outer terminal 5 G004691 ...

Page 44: ... with the oil level sight glasses 25 For GOE 1050 to 2550 align the side of the lifting tool with the oil level guage 26 G005056 Torque 40 4 Nm 4 Put the pull through cord 12 through the box spanner 13 G004680 5 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 G004686 ...

Page 45: ...n the bottom end of the bushing and the inside of the center hole Look for damage 8 Pull down the upper draw rod 35 from the bottom end of the bushing G005040 9 Remove the transport cover 45 from the transformer 46 and the lower draw rod 4 G005041 10 Lift the bushing to a position above the installation opening on the transformer End of instruction ...

Page 46: ...d are locked with thread locking fluid NOTE Use thread locking fluid grade 42 and activator grade 47 G005042 2 Connect the upper draw rod 35 to the lower draw rod 4 G005038 3 Make sure that the joint is correctly threaded 1 Measure the distance H and compare it to the nominal distance H 2 Calculate the nominal distance H L 25 mm 2 mm Refer to the rating plate for the distance L 3 Record the measur...

Page 47: ... G005039 5 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 G003058 6 If the bushing is installed in a non vertical position For GOE 250 t...

Page 48: ... Molykote Multilub to the nut 10 and the threads of the draw rod 2 Install the washer 11 and nut 10 on the draw rod tighten with your fingers 3 Remove excess Molykote Multilub with a rag CAUTION If the nut 10 is not lubricated correctly it will not be tighten to the correct torque This can cause the bushing to fail CAUTION Make sure that the centering ring 28 is in position It is necessary for the...

Page 49: ... lifting tool 1 G004679 11 Remove the pull through cord 12 12 Tighten the draw rod nut refer to Hydraulic tightening of the draw rod nut page 49 or Manual tightening of the draw rod nut page 53 End of instruction 4 8 Hydraulic tightening of the draw rod nut Overview G005065 10 Draw rod nut 38 Hydraulic jack ...

Page 50: ... Nm NOTE The bushing is delivered with an information sheet that specifies the draw rod extension b a These values are measured when the bushing is manufactured and are unique to every unit G005049 2 Install the shaft 37 on the draw rod 35 and put the box spanner 13 on the shaft 37 G004873 3 Make sure that more than 10 mm of the threads on the upper draw rod 35 are used G005066 ...

Page 51: ...0 kN DANGER Apply the hydraulic pressure carefully Incorrectly used high pressure hydraulics can break with explosive force NOTE It is not necessary to compensate for variations in ambient temperature 6 Turn the nut on the upper draw rod 35 with the box spanner tighten by hand 7 Loosen the nut 44 G005067 8 Turn the shaft 37 counter clockwise to remove the shaft socket from the upper draw rod 35 ...

Page 52: ...minus a 3 Compare the calculated value b a with the dimension in the table NOTE Please contact ABB for special bushings Type Extension GOE 250 210 3 5 mm 1 0 GOE 380 300 3 5 mm 1 0 GOE 650 500 5 0 mm 1 0 GOE 950 650 7 0 mm 2 0 GOE 1050 750 9 0 mm 2 0 GOE 1175 850 9 5 mm 2 0 GOE 1300 1050 12 0 mm 2 0 GOE 1425 1150 12 0 mm 2 0 GOE 1550 1175 15 0 mm 2 0 GOE 1675 1300 15 0 mm 2 0 GOE 1800 1360 15 0 mm...

Page 53: ...rod nut and threads of the draw rod to be correctly lubricated The draw rod will not get the correct tension if the fasteners are not correctly lubricated this can cause the bushing to fail If possible ABB recommends that the draw rod is hydraulically tightened refer to Hydraulic tightening of the draw rod nut page 49 Procedure 1 Make sure that the draw rod nut and threads of the draw rod are corr...

Page 54: ... 500 5 0 mm 1 0 GOE 950 650 7 0 mm 2 0 GOE 1050 750 9 0 mm 2 0 GOE 1175 850 9 5 mm 2 0 GOE 1300 1050 12 0 mm 2 0 GOE 1425 1150 12 0 mm 2 0 GOE 1550 1175 15 0 mm 2 0 GOE 1675 1300 15 0 mm 2 0 GOE 1800 1360 15 0 mm 2 0 GOE 2550 1600 18 0 mm 2 0 GOE 2550 1675 18 0 mm 2 0 G005050 4 Make sure with a torque wrench that the nut is tightened with a torque of more than 70 Nm and less than 140 Nm 5 When ins...

Page 55: ... CAUTION A lower oil level will reduce the electrical insulation G006300 End of instruction 4 11 Installation of the outer terminal Procedure 1 Prepare the contact surface 47 and gasket surface 87 1 Carefully clean the contact surface and gasket surface with a soft cloth 2 Apply Vaseline to the contact surface 3 Apply Mobilgrease 28 to the gasket surface CAUTION Do not use a wire brush on the tin ...

Page 56: ...oating on aluminium outer terminals A wire brush can make scratches in the tin zinc coating 47 NOTE Or use lubricants with equal properties to Vaseine and Mobilgrease 28 NOTE When the outer terminal 5 is installed at site for grid operation replace the used O ring 3 with a new O ring A new O ring is supplied with the bushing G007351 3 Assemble the tightening ring 48 the O ring 3 and the outer term...

Page 57: ...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 G003053 Torque 40 4 Nm 9 Tighten the M8 bolts 24 Tighten the bolts in a crosswise sequence G004684 Torque 20 2 Nm 10 Install the external connections Refer to the documentation from the supplier of the external connection End o...

Page 58: ... equipment or death to personnel Procedure with a cone point set screw 1 Apply a large quantity of Mobilgrease 28 to the cone point set screw 50 CAUTION The quality of the cone point set screw is important stainless steel of A4 80 quality is recommended NOTE Or use a lubricant similar to Mobilgrease 28 G005044 2 Install the cone point set screw 50 NOTE The cone point of the set screw penetrates th...

Page 59: ...y 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 4 Install the bolt 50 Torque M12 40 Nm 5 Connect the other end of the flexible cable 64 to the transformer NOTE This makes an electrical connection between the bushing and transformer tank keeping them at the same potentia...

Page 60: ...60 Installation and commissioning guide 2750 515 1 EN REV 14 2020 06 26 ...

Page 61: ...AUTION If you do not obey this procedure flashovers or partial discharges can occur inside the bushing Waiting times after oil filling of the transformer Some waiting time is necessary after the transformer has been oil filled before the bushing is energized The reason for this is that air bubbles stick to the bushings surface when the transformer is filled with oil and flashovers and partial disc...

Page 62: ...s oil filled with chalk or paper strips 5 2 3 Tightness test of bushing outer terminal Overview Because the outer terminal is often situated above the oil level of the transformer oil expansion system a leak at the outer terminal is serious 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...

Page 63: ...al C2 is the capacitance between the test tap and ground Nominal capacitance The capacitance C2 depends on the transformer and it is not possible to give a nominal value that is valid for all service conditions Thus it is important to measure and record the capacitance C2 for future reference such as repairs service etc Type Space for CT 305 mm Space for CT 605 mm C1 C2 C1 C2 GOE 250 210 432 290 5...

Page 64: ...t be multiplied with the correction factor given below Bushing core temperature C Correction factor to 20 C IEC 0 2 0 80 3 7 0 85 8 12 0 90 13 17 0 95 18 22 1 00 23 27 1 05 28 32 1 10 33 37 1 15 38 42 1 20 43 47 1 25 48 52 1 30 53 57 1 34 57 62 1 35 63 67 1 35 68 72 1 30 73 77 1 25 78 82 1 20 83 87 1 10 Procedure 1 De energize the transformer 2 Disconnect the external connections from the outer te...

Page 65: ...rence 7 Install the cover 58 CAUTION The test tap is not self grounding The bushing can be destroyed if the test tap is not grounded Because the capacitance C2 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 CAUTION Do not energize the bushing without the cover or a test ad...

Page 66: ...r terminal of the other bushing on the same transformer winding The through resistance will include the resistance of both bushings all connections and the transformer winding Do the measurement of through resistance before connecting any of the external circuits Because the result of the measurement depends on the temperature and the accuracy with which the temperature can be measured this can be...

Page 67: ...ore 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 Remove the pollution with a moist cloth or a low pressure water jet If necessary put isopropyl alcohol on the cloth DANGER 1 1 1 Trichloroethane or Methyl chloride are not recommended as detergents because they are dangerous to persons and the environm...

Page 68: ...gnificantly higher temperatures can be a sign of bad connections especially at lower current loading Checking of oil leakage Make a visual inspection for oil leakage during regular station supervision After repairs ABB recommends that the capacitance is measured after repairs have been done after maintenance of connected equipment or after work near the bushing is completed It is important to comp...

Page 69: ...ways 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 Procedure 1 Check the oil level NOTE The oil level must be above the red area 29 G006767 ...

Page 70: ...e personal injury DANGER Risk of explosion Do not use power tools and make sure that you do not to cause sparks with manual tools Explosive gases can be generated during normal operation of the bushing CAUTION Be careful when the oil plug is removed contamination can enter the bushing CAUTION Do not use a pipe to fill the bushing with transformer oil it can cause damage to the parts in the bushing...

Page 71: ...o hold the oil valve 51 while removing the cover 89 with a second wrench G007225 3 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 BSPT 4 Take the oil sample 1 Open b the oil valve 51 2 Drain a small amount of the transformer oil 3 Close a the oil valve 51 G006910 5 Install the cover 89 CAUTION Make sure that...

Page 72: ...fill the bushing with oil after an oil sample is taken But it can be necessary to fill the bushing with oil when many oil samples have been taken G006767 7 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 ...

Page 73: ...box spanner 13 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 32 steps 1 through 8 G004924 3 Apply Molykote Multilub to the thread on the pull through cord 12 then connect it to the draw rod NOTE Or use a...

Page 74: ...4 2020 06 26 4 Remove the M16 nut 10 on the draw rod with the box spanner 13 G003055 5 Remove the nuts and washers G005053 6 Lift the bushing from the transformer CAUTION Do not damage the stud bolts there is a risk of metal falling into the transformer G006428 ...

Page 75: ...he joint 60 is locked with tread locking fluid grade 42 NOTE The bushing can have an optional joint or the bottom contact unlocked 56 refer to the specifications for your bushing The guiding cone 62 is loose G005033 8 Pull up the draw rod and install the washer 11 and nut 10 CAUTION Make sure that the centering ring 28 is in position it is necessary for the correct installation of the draw rod G00...

Page 76: ... G007352 13 Install the transport cover 45 on the transformer turret 46 End of instruction 7 2 Removal of horizontally installed bushings Overview This procedure applies to bushings that are connected to the transformer oil system It is important to remove a small quantity of transformer oil to make space for thermal expansion Procedure 1 Remove the bushing from the transformer refer to Removal of...

Page 77: ...nsformer oil until the oil level is correct for storage CAUTION Make sure that the oil level is correct If not changes in the ambient temperature will cause damage to the seals in the bushing NOTE The correct oil level is between the sight glasses 7 Install and tighten the oil plug 9 Use a new gasket Gasket article number 1ZSC001591 AAC CAUTION Use only a gasket that is made from nitrile rubber wi...

Page 78: ...ift the bushing Refer to Lifting the bushing out of the transport box page 17 4 Lower the bushing into the transport box CAUTION Make sure that the there is soft bedding in the transport box CAUTION Make sure that the oil valves and test tap does not make contact with the transport box or other objects 5 Attach the bushing to the transport box in the same way as when it was delivered CAUTION Make ...

Page 79: ...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 Position Part Article number Note 3 O ring 1ZSC00442 CAK 58 Cover 1ZSC004579 AAA G006917 ...

Page 80: ...sition Part Article number Note 9 Oil plug 2121 738 18 77 Gasket 1ZSC001591 AAC G006193 Cover for oil plug 2522 731 A For new design of the top chamber This cover gives protection to the oil plug 2522 731 A Position Part Article number Note 58 Cover 2522 732 42 M24 66 Gasket 2152 795 67 G006277 ...

Page 81: ...50 515 1 EN REV 14 2020 06 26 81 8 3 Special tools Lifting tool Position Part Article number Note 1 Lifting tool 9760 668 A G006196 Pull through cord Position Part Article number Note 12 Pull through cord 9760 669 A With M8 terminal G006918 ...

Page 82: ...EN REV 14 2020 06 26 Hydraulic jack Position Part Article number Note 38 Hydraulic jack 9769 897 A For removal and installation of the bottom contact Draw rod system G006919 Box spanner Position Part Article number Note 13 Box spanner 9760 669 B G006920 ...

Page 83: ...onents should be sent to an approved environmental waste treatment plant for destruction or disposal DANGER Be careful when dissembling the bushing There is a large quantity of mechanical energy stored in the bushing from its assembly disassembly of the bushing can cause it to break with explosive force The bushing has these parts and materials The conductor is made of copper or low alloy aluminum...

Page 84: ...s of plastic should be separated and sent to an approved environmental waste treatment plant or recycling plant The energy content in thermoplastics and thermosetting plastics can often be recovered through combustion at a plant built for the purpose Thermoplastics can usually be melted down and reused without significant loss of quality Composites can be fractioned and used as filling materials i...

Page 85: ...20 06 26 85 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 ...

Page 86: ...86 Installation and commissioning guide 2750 515 1 EN REV 14 2020 06 26 ...

Page 87: ...26 87 11 Appendix 11 1 Measurement record Overview Record the final measurements of the draw rod Record Serial number Date Operator G007212 Ø mm 1 H mm a mm 2 b mm 3 c mm X1 mm 1 Thread diameter 2 Draw rod nut tightened with 10 Nm 3 After hydraulic tightening Comments ...

Page 88: ...wer 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 2750 515 1 EN REV 14 2020 06 26 ...

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