ABB UBB Series Installation And Commissioning Manual
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ABB UBB Series Installation And Commissioning Manual

ABB UBB Series Installation And Commissioning Manual

On-load tap-changers
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1ZSE 5492-118 en, Rev. 5
On-load tap-changers, type UBB
Installation and commissioning guide

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  • Page 1 1ZSE 5492-118 en, Rev. 5 On-load tap-changers, type UBB Installation and commissioning guide...
  • Page 2 Any specific application not covered should be referred directly to ABB, or its authorized representative. ABB makes no warranty or representation and assumes no liability for the accuracy of the information in this document or for the use of such information. All information in this document is subject to change without notice.
  • Page 3 Used tap-changer oil from diverter switch housings and selector switch housings contains harmful Do not alter or modify a unit without first consulting ABB. substances. Fumes are irritating to the respiratory organs and the eyes and are highly flammable. Used Follow local and international wiring regulations at all times.
  • Page 4 WARNING Mounting of gaskets CAUTION Before carrying out work on the tap-changer, put the LOCAL/REMOTE switch on the motor-drive mechanism to position LOCAL or 0, and switch the Sealing surfaces and gaskets must be clean and protective motor device to 0. It is also advisable to undamaged.
  • Page 5 WARNING After oil filling CAUTION If the tap-changer is not at its exact position and the hand crank is pulled out, the motor-drive mechanism Do not energize the transformer earlier than three will start and go to the exact position if the power hours after oil filling at atmospheric pressure.

  • Page 7: Table Of Contents

    Content 1. Introduction ..........................9 1.1 Required tools ......................11 1.2 Required material ......................11 1.3 Oil ..........................11 1.4 Oil conservator ......................11 1.5 Oil filter unit for continuous oil filtration................11 1.6 Weights ........................11 1.7 Tightening torque ......................11 2. Receiving ..........................12 2.1 Unpacking ........................12 2.2 Inspection upon receiving .....................12 2.3 Temporary storage before assembly................12 3.
  • Page 8 8. Transport ..........................38 8.1 General .........................38 8.2 Transport preparations ....................38 9. Commissioning ........................39 9.1 Reassembly ........................39 9.2 Oil filling ........................39 9.3 Electrical connection and testing ...................39 9.4 Putting into operation ....................40...

  • Page 9: Introduction

    1. Introduction The delivery consists of on-load tap-changer, motor-drive transformer cover is then lowered onto the tank, and the mechanism and drive shaft system. tap-changer is lifted and bolted to the cover. Please use the appropriate instruction for cover-mounting or yoke-mounting! The tap-changer may be specified for cover-mounting or for yoke-mounting.
  • Page 10 Air release valve to Top cover Connection to oil tap-changer conservator Pressure relay Bevel gear Oil valve Flange Air release valve to transformer tank Cylinder Indicator window Change-over selector: Moving contacts Fixed contacts Selector switch: Current collector Fixed contacts terminal Moving contacts Transition resistor Selector switch shaft...

  • Page 11: Required Tools

    Drive shaft system: Approx. 10 kg The tap-changer has to be connected to an oil conservator. ABB recommends the use of a separate conservator for the tap-changer with both oil and air side separated from the 1.7 Tightening torque main conservator of the transformer.

  • Page 12: Receiving

    It is also recommended that photos are taken of the damaged details. Mark the photos with ABB’s reference number and the serial number of the tap-changer and send them to ABB for comments.

  • Page 13: Installation In The Transformer

    3. Installation in the transformer The cover-mounting method (chapter 3.1) or yoke-mounting 3.1 Cover-mounting method (chapter 3.2) is used. 1. Place the gasket (O-ring or plane gasket is usable) around the opening in the transformer cover. (This gasket is not When lifting an UBB model it is recommended to use the included in the tap-changer delivery).
  • Page 14 3.1.1 Connection to outside terminals The connection to terminals for change-over selector, selector switch and current collector shall follow the connection diagram delivered with the tap-changer. Connection holes for bolts M10 are Ø11 mm for all terminals. Wrong Terminal CAUTION All connections shall be made carefully and in such a way that there is no risk for them to come Right...

  • Page 15: Yoke-Mounting

    3.2 Yoke-mounting Mounting of the tap-changer to the yoke-fork can be made (Pre-mounting on active part of the transformer). according to two alternatives depending on when the testing of the transformation ratio shall be performed: The top section of the tap-changer is designed to be divided into an upper and a lower flange, see Fig.
  • Page 16 CAUTION 3.2.1 Mounting of the tap-changer when transformer ratio measurement is carried out before drying Mounting to the yoke-fork of the transformer, see Fig. 7. Watch the voltmeter during the tap-changer operations. No fast voltage drops may occur during 1. Mount the tap-changer on the transformer’s yoke-fork, operation.
  • Page 17 max 90 Fig. 7. max 90 O-ring for top cover Fig. 8. Sealing for suction pipe O-ring for upper flange Fig. 9. 1ZSE 5492-118 en, Rev. 5 | Installation and commissioning guide UBB 17...
  • Page 18 3.2.2 Mounting of the tap-changer when transformer ratio measurement is carried out after drying Mounting to the yoke-fork of the transformer. See Fig. 10. max 90 1. Loosen all the twelve bolts and washers in the top cover and lift the cover carefully min. 100 mm straight upwards before moving it in horizontal direction.

  • Page 19: Mounting To The Transformer Cover From The Yoke (After The Drying Process)

    3.2.3 Mounting to the transformer cover from the yoke 9. Remove the lifting bar and mount a washer and a screw in each of the free holes. (after the drying process) 1. Place the O-ring in its groove in the lower flange. (An alternative method, if the lifting bar is not available, is 2.
  • Page 20 Lift Max 90 Screw M8 (12x) Washer Lifting bar LL 117 016-K Nut M12 (16x) Upper flange Washer Gasket Stud M12 (16x) (Not included Transformer cover in the delivery) Yoke-fork Lower flange Guiding pin O-ring Cylinder (Lifting bar) Gear mechanism Fig.
  • Page 21 Protective tube Hose clip Cover Bevel gear Top cover Screw M6 Coupling half Driving pin Guiding pin View A - A Driving disc Fig. 13. 1ZSE 5492-118 en, Rev. 5 | Installation and commissioning guide UBB 21...

  • Page 22: Drying

    Close the bottom valve. Tightening torque is approximately 15 Nm. 2. If a tie-in resistor from ABB is supplied, its screw joints are to be retightened (tightening torque 15 Nm) and locked by the method specified by the transformer manufacturer.

  • Page 23: Final Assembly

    5. Final assembly 5.1 Mounting of the motor-drive mechanism See Figs. 1, 14 and 15. Proceed as follows: 1. Mount the motor-drive mechanism onto the transformer. The mounting holes on the transformer should be leveled within 1 mm. If adjustment is needed, shims should be used. 2.
  • Page 24 Indicator window 9 9 9 9 8 7 L O W E R P O S I T I O N R A I S E 1 0 1 1 – Position indicator Adjustment nuts Brake disc Red mark Brake pads Fig.
  • Page 25 Indicator window White indicator flag 10 11 12 1 2 3 4 5 6 7 Position indication Roller on brake arm in the notch of the cam disc Brake arm Contra nut Cam disc Brake disc Adjusting screw Fig. 15. Position alignment for type BUL2. 1ZSE 5492-118 en, Rev.

  • Page 26: Mounting Of Accessories

    5.2 Mounting of accessories 5.3 Mounting of external drive shafts The accessories on the tap-changer top cover can be The external drive shafts consists of square tubes and shall rearranged to suite the individual transformer. be connected to the spherical shaft ends on bevel gears and motor-drive mechanism by means of two coupling halves.
  • Page 27 SA11 Bevel gear on the top cover SA10 SA25 SA22 SA24 SA23 SA25 SA10 SA21 SA20 SA11 SA12 SA12 SA13 SA13 SA17 SA18 SA19 Horizontal drive shaft SA10 SA11 SA12 SA13 SA10 Hose clip SA11 Couplinghalves Vertical drive shaft SA12 Hexhead cap screw M6 SA16 SA13...
  • Page 28 5.3.1 Mounting of horizontal drive shaft 7. Push the two protective tubes on to the bevel gears and 1. Mount the bevel gear SA21 on the transformer, with O-ring clamp them with hose clips, SA10, see Fig. 24. SA20, four clamps SA17, hexagon head bolts M10, SA18 and washers SA19, see Fig.
  • Page 29 Driving pin Square shaft SA11 SA12 SA13 Max. 6 mm Fig. 20. Fig. 21. Square shaft SA11 SA11 SA21 Max. 3 mm Fig. 22. Fig. 23. SA10 SA24 SA25 SA23 SA10 Slot facing downwards SA23 Fig. 24. 1ZSE 5492-118 en, Rev. 5 | Installation and commissioning guide UBB 29...
  • Page 30 5.3.2 Mounting of vertical drive shaft 6. Connect the square shaft with the mounted coupling 1. Determine the dimension K2 between the spherical shaft halves to the shaft of the bevel gear. Mount two coupling ends, see Fig. 25. halves SA14 to the square shaft perpendicular to the 2.
  • Page 31 key is facing the earthing symbol. Mount the two screws and the locking nuts in the two holes of the coupling halves which are closest to each other and tighten. SA10 WARNING SA16 The bevel gear contains moving gears. Be cautious! CAUTION If the key is not in position as described above, SA14...

  • Page 32: Connection To The Oil Conservator

    Oil filter with housing can be ordered from ABB. 5.5 Before operation 1. Check that the tap-changer and the motor-drive mechanism have the same indicated position and that the key position of the tap-changer bevel gear is in accordance to Fig.

  • Page 33: Supervisory Equipment

    5.5.1 Transformer ratio measurement after drying If transformer ratio measurement is to be done after drying this is a suitable stage to carry it out. CAUTION To avoid seizing, do not operate the tap-changer until it is filled with oil. Carry out this measurement after the drive system is mounted.

  • Page 34: Oil Filling

    6. Oil filling 6.1 Filling methods and restrictions When the transformer and the tap-changer have a common Oil filling can be carried out at atmospheric pressure or oil conservator, a filter in the connection between the tap- under vacuum. The wall between the tap-changer and the changer and the conservator is needed.

  • Page 35: Correct Oil Level

    In case the tap-changer is 6.5 Restoring the gas cushion equipped with an oil filter unit for continuous oil filtration from ABB, and it is installed according to our recommendations, WARNING follow the instructions in ”Oil filter unit for tap-changers, manual”...

  • Page 36: Electrical Connection And Testing

    7. Electrical connection and testing 7.1 Electrical connection 3. Manually crank the motor-drive mechanism to a position in Before the transformer is energized, tests must be performed the middle of the range. to make sure that all mechanical and electrical connections 4.
  • Page 37 WARNING If the position indicators on the motor-drive mechanism and on the tap-changer do not show the same position, a serious transformer failure could occur. 15. Operate one step. 16. Check that the tap-changer follows the motor-drive mechanism. 17. Operate the driving mechanism electrically between the end-positions.

  • Page 38: Transport

    8. Transport 8.1 General If the transport dimensions allow, the transformer may be transported without dismantle any parts of the tap-changer. If the motor-drive mechanism or any parts of the shaft system has to be dismantled for the transport, the parts must be marked to ensure they can be set up properly on site and with a minimum of work.

  • Page 39: Commissioning

    9. Commissioning CAUTION This section describes tasks to be carried out when the transformer is being installed and tested on site. If the protective motor switch has not released within 60 seconds, disconnect the power and check the CAUTION settings with the rating plate of the motor. Adjust if necessary and check again when the motor has The motor-drive mechanism must be protected cooled down.

  • Page 40: Putting Into Operation

    9.3.6 Heater Switch off all power supplies and feel with a finger on the protection plate that the heater has been warmed up during earlier tests. Switch on the power afterwards. 9.3.7 Pressure relay Check the function as described in Accessories and protection devices for on-load tap-changers, 1ZSC000562-AAD 9.4 Putting into operation...
  • Page 44 Contact us ABB AB Components SE-771 80 Ludvika, Sweden Phone: +46 240 78 20 00 Fax: +46 240 121 57 E-Mail: sales@se.abb.com www.abb.com/electricalcomponents...

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