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User’s guide VUBB

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1ZSC000562-AAL en

8. 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.

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Summary of Contents for VUBB

Page 1: ...Vacuum on load tap changers type VUBB User s guide 1ZSC000562 AAL en...

Page 2: ...tative 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 subj...

Page 3: ...e over selector 14 2 4 Contacts 14 2 5 Vacuum interrupters 14 2 6 Transition resistors 14 2 7 Spring loaded mechanism 14 2 8 Motor drive mechanism 14 2 9 Accessories and protection devices 14 2 10 Rat...

Page 4: ...ber 33 7 2 Oil leakage 33 7 2 1 General 33 7 2 2 Tools required 33 7 2 3 Materials and spare parts required 33 7 2 4 Procedure 33 7 3 Replacement of pressure relay 35 8 Electrical diagrams 36 8 1 Stan...

Page 5: ...ion 1 3 Safety precautions 1 3 1 Personal safety Unused transformer oil is somewhat harmful Fumes from unused warm oil may irritate the respiratory organs and the eyes After long and repeated contact...

Page 6: ...examined before the transformer is reenergized 2 2 Functional description The on load tap changer is a device for changing the tapping connection of a winding while the transformer is under load The m...

Page 7: ...irst 1 Position for continuous load through fixed contact 1 2 Resistor auxiliary contact disconnects from fixed contact 1 3 Resistor vacuum interrupter opens 4 Resistor auxiliary contact connects to f...

Page 8: ...current and commuting the load current to the resistor branch 7 Main auxiliary contact disconnects from fixed contact 1 8 Main auxiliary contact connects to fixed contact 2 9 Main vacuum interrupter c...

Page 9: ...t 2 Fig 10 Fig 11 Fig 12 Fig 13 Fig 14 2 Main vacuum interrupter opens breaking the load current and in doing so commutes it to the resistor branch 3 Main auxiliary contact disconnects from fixed cont...

Page 10: ...Fig 15 Fig 16 Fig 17 Fig 18 6 Resistor vacuum interrupter opens breaking the circulating current 7 Resistor auxiliary contact disconnects from fixed contact 2 8 Resistor vacuum interrupter closes 9 R...

Page 11: ...nsformer s active part Cover mounting means that the tap changer is lowered through a hole in the transformer cover and then bolted straight onto the transformer cover See Fig 19 Yoke mounting means t...

Page 12: ...23 Coarse fine switching Plus minus switching type R With plus minus switching the change over selector extends the regulating range to twice the voltage of the tapped winding by connecting the main w...

Page 13: ...oint N Only one unit is required for all three phases The transformer s neutral point is in the tap changer Fig 24 Three phase star point connection Fig 25 Three phase delta fully insulated connection...

Page 14: ...the change over selector this number can be doubled 2 4 Contacts The contacts inside the selector switch are used for carrying the electrical load The contacts are comprised of fixed and operating con...

Page 15: ...g loaded mechanism Transition resistor Vacuum interrupter Change over selector Valve Pressure relay Shielding ring Position indicator window Inspection cover Terminals Intermediate flange for yoke mou...

Page 16: ...cording to IEC 60422 2005 Fig 28 Location of serial number plate and rating plate Fig 27 Example of rating plate 2 10 Rating plate The rating plate is on the door of the motor dive unit The unit s ser...

Page 17: ...place O rings on the flanges 1 Mount the motor drive mechanism if it is not mounted upon delivery Mounting of the motor drive mechanism is described in a separate instruction manual 2 Mount the exter...

Page 18: ...to the level where the pointer on the oil level indicator points half way between MIN and MAX For temperatures other than 20 C proceed as follows For every 10 C increase of temperature adjust the oil...

Page 19: ...mer 2 Open the valve between the tap changer and the conservator 3 Close the oil valve 4 Put the transformer under vacuum The tap changer is then put under vacuum automatically as well 5 Let oil in th...

Page 20: ...t system that should be dismantled before transporting the transformer to the site keep their identification numbers according to the packing list to simplify the remounting of the shaft system on sit...

Page 21: ...wards See Fig 36 8 Fit two hose clips See Fig 37 9 Apply a thin layer of grease to all spherical shaft ends and unpainted surfaces of the bevel gears Use any of the greases specified in Section 3 3 10...

Page 22: ...tening torque 16 Push the two protective tubes horizontally until they touch the bevel gears See Fig 40 Make sure that the slot on the protective tubes is facing downwards 17 Clamp the protective tube...

Page 23: ...ing halves on the square shaft Fig 44 Fit screws and washers to the coupling halves 3 Push the shaft to the bottom of the fitting in the coupling halves 4 Fit six screws and washers in the holes on th...

Page 24: ...sen the two screws on the multi hole coupling at the top of the motor drive mechanism See Fig 50 11 For BUE motor drive mechanism loosen the two screws on the multi hole coupling inside the motor driv...

Page 25: ...tube with the greater diameter upwards 14 Connect the bottom end of the square shaft with the mounted coupling halves to the shaft of the motor drive mechanism See Fig 53 15 Fit six screws and washers...

Page 26: ...k that the position indicators on the motor drive mechanism Fig 59 and the tap changer Fig 60 show the same position WARNING If the position indicators on the motor drive mechanism and on the tap chan...

Page 27: ...e For a BUL2 motor drive mechanism continue at step 7 For a BUE motor drive mechanism continue at step 10 For BUL2 7 Run the motor drive mechanism 8 Check that the center of the notch in the cam disc...

Page 28: ...ork is carried out on the tap changer make sure that the transformer is disconnected and that grounding is properly executed Obtain a signed certificate from the engineer in charge 3 9 Putting into op...

Page 29: ...4 1 Synchronization between tap changer and motor drive mechanism 1 Loosen the multi hole coupling Turn the shaft first to the end position on one side and then to the end position on the other side...

Page 30: ...arate guide for the motor drive mechanism The registered number of operations should be noted each time inspection and maintenance are conducted The VUBB tap changer has been designed to provide maxim...

Page 31: ...ear Fig 65 Oil sampling tap 5 4 Maintenance For maintenance please contact ABB or make sure that personnel performing maintenance are trained and certified by ABB Maintenance of the tap changer should...

Page 32: ...e leakage 1 If there is no visible leakage adjust the oil level according to Section 3 5 3 2 Check the oil level later Pressure relay has tripped For troubleshooting instructions regarding the pressur...

Page 33: ...anism and on the flange of the selector switch housing see Section 2 19 The serial number must be stated in all correspondence with the manufacturer Failure to use the serial number may cause delays 7...

Page 34: ...Refit the M12 bolts and washers to the top cover See Fig 66 9 Tighten the bolts Tightening torque 84 10 10 Refill the oil see Section 3 5 If there is still oil leakage check if the leakage is between...

Page 35: ...r of the tap changer Fig 60 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 To access the...

Page 36: ...en 8 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 diag...

Page 37: ...LIMIT CLOSED AT LOWER LIMIT OPEN AT UPPER LIMIT CLOSED AT UPPER LIMIT ITEM Q1 OFF RUN THROUGH ALARM STEP BY STEP DE ENERGIZED REMOTE 0 LOCAL SUPPLY FOR HEATER SUPPLY FOR CONTROL CIRCUIT 1 CONTINUATION...

Page 38: ...rotective switch S1 Control selector switch S2 Control switch S5 Interlocking switch open when hand crank is fitted S6 Cam switch limit switch S8 Pushbutton EMERGENCY STOP S9 Switch door operated S11...

Page 39: ...RAM WHEN OUTLET IS ORDERED CIRCUIT BREAKER OFF 1 CONTINUATION CONTACT INCLUDED ONLY WHEN OLTC HAS THROUGH POSITIONS CLOSED WHEN OLTC IS AT THROUGH POSITIONS 2 REMOVE CONNECTION X4 1 2 TO DISABLE STEP...

Page 40: ...ime relay tap change incomplete M1 Motor Q1 Protective motor switch S1 Control selector switch S2 Control switch S3 S4 Cam operated contacts 33 34 Maintaining contact 41 42 Interlocking contact 13 14...

Page 41: ...on problems during de commissioning even in the small quantities used 9 3 1 General Upon disposal of this product compliance with the local environmental regulations of each country is recommended The...

Page 42: ...er s guide VUBB 1ZSC000562 AAL en 9 3 4 Gearing mechanism Material Approximate amount kg Steel 21 Brass 1 3 Stainless steel 1 Aluminum 0 1 9 3 5 Drive shaft system Material Approximate amount kg Steel...

Page 43: ......

Page 44: ...s Copyright 2012 ABB All rights reserved 1ZSC000562 AAL en 2012 11 30 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 electricalc...

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