ABB VUBB User Manual
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ABB VUBB User Manual

ABB VUBB User Manual

Vacuum on-load tap-changers, type vubb
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1ZSC000562-AAL en
Vacuum on-load tap-changers, type VUBB
User's guide

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Summary of Contents for ABB VUBB

  • Page 1 1ZSC000562-AAL en Vacuum on-load tap-changers, type VUBB User’s 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: Table Of Contents

    Content 1. Safety ..........................5 1.1 General ........................5 1.2 Safety warnings ......................5 1.3 Safety precautions ....................5 1.3.1 Personal safety ....................5 1.3.2 Environmental safety ................... 5 1.3.3 First aid ......................5 1.3.4 In the event of fire ....................5 2.
  • Page 4 4. Operation ......................... 29 4.1 Synchronization between tap-changer and motor-drive mechanism ......29 5. Inspection ......................... 30 5.1 General ........................30 5.2 Inspection ......................... 30 5.3 Checking oil quality ....................31 5.4 Maintenance ......................31 5.5 Replacement of the complete switching mechanism including vacuum interrupters .. 31 6.

  • Page 5: Safety

    Avoid vomiting. 1. Drink water or milk. 2. Call a doctor. 1.3.4 In the event of fire In the event of fire, extinguish with a powder, foam or carbon acid extinguishing agent. 1ZSC000562-AAL en | User’s guide VUBB 5...

  • Page 6: Introduction

    (dehydrating breather or one-way breather). Make sure that no The electrical circuit principle for the VUBB is shown in open fires, hot surfaces or sparks are present in the Figs. 1-18. The purpose of the operation is to commute the immediate surroundings of the breathing devices.

  • Page 7: Switching Sequence, Operation With Resistor Side First

    2. Resistor auxiliary contact disconnects from fixed contact 1. Fig. 2. 3. Resistor vacuum interrupter opens. Fig. 3. 4. Resistor auxiliary contact connects to fixed contact 2. Fig. 4. 5. Resistor vacuum interrupter closes, producing a circulating current. Fig. 5. 1ZSC000562-AAL en | User’s guide VUBB 7...
  • Page 8 Fig. 7. 8. Main auxiliary contact connects to fixed contact 2. Fig. 8. 9. Main vacuum interrupter closes, commuting the load current to the main branch. Continuous load on fixed contact 2. Fig. 9. 8 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 9: Switching Sequence, Operation With Main Contact First

    3. Main auxiliary contact disconnects from fixed contact 2. Fig. 12. 4. Main auxiliary contact connects to fixed contact 1. Fig. 13. 5. Main vacuum interrupter closes. The load current commutes to the main branch, producing a circulating current. Fig. 14. 1ZSC000562-AAL en | User’s guide VUBB 9...
  • Page 10 6. Resistor vacuum interrupter opens, breaking the circulating current. Fig. 15. 7. Resistor auxiliary contact disconnects from fixed contact 2. Fig. 16. 8. Resistor vacuum interrupter closes. Fig. 17. 9. Resistor auxiliary contact connects to fixed contact 1. Fig. 18. 10 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 11: System Overview

    The VUBB tap-changer is of the in-tank design. The motor- drive mechanism is attached to the transformer tank and connected to the tap-changer by means of drive shafts and a bevel gear.

  • Page 12: Types Of Switching

    Coarse/fine switching (type D) With coarse/fine switching, the change-over selector extends the regulating range to twice the voltage of the tapped winding by connecting or disconnecting the coarse regulating winding. Fig. 23. Coarse/fine switching. 12 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 13: Types Of Connection

    Fig. 24. Three-phase, star point connection. Three-phase delta, fully insulated (T) Only one unit is required for all three phases. Fig. 25. Three-phase delta, fully insulated connection. 1ZSC000562-AAL en | User’s guide VUBB 13...

  • Page 14: Housing

    Sections 2.2.1 and 2.2.2. the tap-changer. Energy is provided from a motor through a series of gears and out through a drive shaft. Several features The VUBB tap-changer contains three selector switches, one are incorporated within the mechanism to lengthen service per phase.
  • Page 15 Change-over selector Vacuum Terminal interrupter Terminals Main auxiliary contact Selector switch Selector switch shaft Shielding ring Transition resistor Bottom valve Fixed contact Bottom flange Potential connection to bottom flange Fig. 26. VUBB overview. 1ZSC000562-AAL en | User’s guide VUBB 15...

  • Page 16: Rating Plate

    The unit’s serial number is on the top flange of the tap- changer. Oil test according to IEC 60422 2005. Fig. 27. Example of rating plate. Fig. 28. Location of serial number plate and rating plate. 16 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 17: Commissioning

    The following greases (ball bearing greases) or similar are Remember to place O-rings on the flanges. required during installation: – GULF-718 EP – Mobil-Grease 28 – SHELL-Aero Shell Grease 22 1ZSC000562-AAL en | User’s guide VUBB 17...

  • Page 18: Tightening Torques

    O-rings on the flanges. CAUTION Wait at least three hours before energizing the transformer after filling oil at atmospheric pressure. This waiting period is necessary to allow air bubbles to dissipate. 18 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 19: Filling Under Vacuum

    Transformer Tap-changer tap-changer. 8. Connect the breathing device to the oil conservator for the Fig. 29. Vacuum filling overview. tap-changer. Make sure the connection to the breathing device is properly sealed. 1ZSC000562-AAL en | User’s guide VUBB 19...

  • Page 20: Mounting Of External Drive Shafts

    The tubes around shafts and couplings are for protection. 20 User’s guide VUBB | 1ZSC000562-AAL en...
  • Page 21 7. Position the two protective tubes with the slotted ends Fig. 38. The couplings should be offset 90° in relation to each other. outwards. See Fig. 36. Fig. 36. Position the tubes with the slotted ends outwards. 1ZSC000562-AAL en | User’s guide VUBB 21...
  • Page 22 16. Push the two protective tubes horizontally until they touch the bevel gears. See Fig. 40. Fig. 42. Self-adhesive information plates on the tubes. Fig. 40. Push the two protective tubes horizontally. 22 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 23: Mounting Of Vertical Drive Shaft

    4. Fit six screws and washers in the holes on the coupling halves. See Fig. 44. Fig. 46. Tighten the remaining screws. Fig. 44. Fit screws and washers to the coupling halves. 1ZSC000562-AAL en | User’s guide VUBB 23...
  • Page 24 See Fig. 51. Fig. 48. Place protective tubes on the vertical drive shaft. Multi-hole coupling flanges 9. Fit two hose clips. See Fig. 49. Fig. 51. BUE multi-hole coupling. Fig. 49. Fit two hose clips. 24 User’s guide VUBB | 1ZSC000562-AAL en...
  • Page 25 20. Secure the tube with a hose clip. See Fig. 56. 15. Fit six screws and washers in the holes on the coupling halves (see Fig. 44) and tighten them lightly. Fig. 56. Fit a hose clip. 1ZSC000562-AAL en | User’s guide VUBB 25...
  • Page 26 See Fig. 60. 22. If the motor-drive mechanism is out of position, manually crank the motor-drive mechanism to the exact position Fig. 60. Position indicator on the tap-changer. according to the info box above. 26 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 27: Testing

    21. Operate the tap-changer electrically to the other end- For a BUL2 motor-drive mechanism, continue at step 7. position. 22. Repeat the test procedure above. For a BUE motor-drive mechanism, continue at step 10. 1ZSC000562-AAL en | User’s guide VUBB 27...

  • Page 28: Energizing

    BUE and BUL installation and commissioning guide. Check the oil level one month after filling. It is usual for the oil level of the oil conservator to decrease due to gas absorption in the oil. 28 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 29: Operation

    Fig. 63. Clearance at the bottom of the tube. 6. Secure the tube with the hose clip. See Fig. 64. Fig. 61. Turning the shaft between end-positions. Fig. 64. Secure the hose clip. 1ZSC000562-AAL en | User’s guide VUBB 29...

  • Page 30: Inspection

    5. Inspection The VUBB tap-changer has been designed to provide 5.2 Inspection maximum reliability. The simple and robust design provides It is recommended that the tap-changer be inspected at the a service life equal to the service life of the transformer.

  • Page 31: Checking Oil Quality

    ABB. An oil filter unit is normally not required on the VUBB tap- changer. But, if the tap-changer is equipped with an oil filter The estimated contact life of the vacuum interrupters in the unit from ABB, it should be inspected once a year.

  • Page 32: Troubleshooting

    There is a leakage in the connections to the conservator. Drying agent has changed color from the top of the breather Locate the leakage and seal it. CAUTION Do perform service on the transformer after a pressure relay trip; contact the manufacturer. 32 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 33: Repairs And Adjustments

    7. Repairs and adjustments 7.1 General 7.2.2 Tools required Repairs on the VUBB tap-changer fall into two categories: Standard set of metric combination wrenches. Repairs – Replacing worn or end-of-service-life parts 7.2.3 Materials and spare parts required – O-rings Modifications – Improving the already very high standard of –...
  • Page 34 10 cm procedure: If the leakage is in the gear box (from the tap- changer into the gear box), contact ABB for further instructions. Fig. 67. Procedure for lifting the cover. 11. Be sure that the oil level in the tap-changer is lowered by 100-150 mm.

  • Page 35: Replacement Of Pressure Relay

    Synchronize the shaft as described in section 4.1. the function test, it must be replaced. This is described in the assortment guide. CAUTION It is not permitted to only replace the microswitch inside the pressure relay. 1ZSC000562-AAL en | User’s guide VUBB 35...

  • Page 36: Electrical Diagrams

    On the following pages, the standard circuit diagrams and the contact timing diagrams for BUE and BUL2 are shown. Be sure to use the circuit diagram and the contact timing diagram delivered with your tap-changer. 36 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 37: Standard Circuit Diagram Bue

    TAP- OPEN AT OPEN AT CLOSED CLOSED ITEM Q1 OFF/ STEP-BY- REMOTE 0 LOCAL CHANGE CHANGE CHANGE LOWER UPPER RUN-THROUGH STEP DE- LIMIT LIMIT UPPER LOWER ALARM ENERGIZED POSITION PROGRESS PROGRESS LIMIT LIMIT 1ZSC000562-AAL en | User’s guide VUBB 37...

  • Page 38: Contact Timing Diagram Bue

    S14 Position transmitter (potentiometer) S15 Continuation contact Terminal board group UPPER LOWER LIMIT POS. LIMIT POS. Raise operation Remote control Lower operation Local control Upper limit pos. Protective earth TAP-CHANGE OPERATION Lower limit pos. Crank 38 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 39: Standard Circuit Diagram Bul2

    ITEM Q1 OFF/RUN- STEP-BY-STEP STEP-BY-STEP REMOTE LOCAL UPPER LIMIT LOWER LIMIT THROUGH ALARM IN OPERATION DE-ENERGIZED CONTACTS OPEN TOWARDS ITEM F2 OFF TAP-CHANGE IN ITEM Q1 ON ITEM Q1 OFF TAP-CHANGE REMOTE LOCAL PROGRESS INCOMPLETE 1ZSC000562-AAL en | User’s guide VUBB 39...

  • Page 40: Contact Timing Diagram Bul2

    Power supply unit, 100-240 V AC /24 V DC Terminal board group Internal terminal board group TAP-CHANGE OPERATION n → n+1 1 tap LOCAL control n → n-1 1 tap REMOTE control Upper limit-position Protective ground Lower limit-position Crank 40 User’s guide VUBB | 1ZSC000562-AAL en...

  • Page 41: Technical Data

    9.3.3 Selector switch Material Approximate amount (kg) 9.2 Weights Aluminum The approximate weight of the VUBB tap-changer is specified Copper below. The specified weights do not include the weights of Fiberglass 49.6 the motor-drive mechanism and the drive shaft system.

  • Page 42: Gearing Mechanism

    9.3.4 Gearing mechanism Material Approximate amount (kg) Steel Brass Stainless steel Aluminum 9.3.5 Drive shaft system Material Approximate amount (kg) Steel 10.1 42 User’s guide VUBB | 1ZSC000562-AAL en...
  • 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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