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1ZSC000562-AAX en, Rev. 1

Technical guide VUC

Main vacuum interrupters

Transition resistors

Spring drive
mechanism

Plug-in contacts

Fig. 2. Diverter switch, type VUCG, with housing.

Cover

Lifting eyes

Connection flanges (x4)

Top section

Shielding-ring

Current terminal

Bottom section

Valve for use at
processing

Bushings connecting
from the tap selector

Insulating
cylinder

Diverter switch

Oil draining tube

Intermediate gear

Driving disc for the
diverter switch

Guide pins

Shielding-ring

Insulating shaft

Bevel gear with
position indicator

Buffer springs

Flange for connection
to gas operated relay
(transformer main tank)

Summary of Contents for VUCG.N

Page 1: ...On load tap changers type VUC Technical guide 1ZSC000562 AAX en Rev 1...

Page 2: ...ntative 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 sub...

Page 3: ...the electrical connection are correctly realized by the manufacturer of the transformer e g in compliance with our Installation Instructions and EMC Directive 89 336 EEC regarding the intrinsic chara...

Page 4: ...f connection 17 Three phase neutral point N 17 Single phase E 17 Three phase delta B 17 Three phase fully insulated delta T 17 Three phase fully insulated auto transformer T 17 Tap changer characteris...

Page 5: ...anism 31 Design 31 Installation 31 Maintenance 31 Operating shafts 31 Dimensions 33 Dimensions type VUCG 33 Type VUCG E and VUCG N with tap selector type C and cover mounting 34 Type VUCG E and VUCG N...

Page 6: ...Fig 1 Main parts on load tap changers type VUC Design principles is mounted beneath the diverter switch housing consists of the fine tap selector and usually also of a change over selector Power to o...

Page 7: ...flanges x4 Top section Shielding ring Current terminal Bottom section Valve for use at processing Bushings connecting from the tap selector Insulating cylinder Diverter switch Oil draining tube Interm...

Page 8: ...interrupters and auxiliary contacts The auxiliary contacts are also able to break the load current in the unlikely event that a vacuum interrupter failure should occur For VUCG in service position th...

Page 9: ...contact fingers each The fingers make contact at one end with the fixed contact and at the other with the current collector The moving contacts slide on the fixed contacts and the current collector r...

Page 10: ...le in two designs one for cover mounting and one for pre mounting yoke mounting on the transformer s active part The diverter switch housings have high quality seals that guarantee vacuum and overpres...

Page 11: ...is available on request Special shaft systems are also available on request Transition resistors The transition resistors are made of wire and located above the diverter switch contacts The resistors...

Page 12: ...in vacuum interrupter MVI and hence let the current flow through the transition resistor TR Fig 9 The main contact MC is then rotated Figs 10 and 11 in order to connect to v The main vacuum interrupte...

Page 13: ...guide VUC 13 MVI MC RVI TR RC x v MVI MC RVI TR RC x v MVI MC RVI TR RC x v MVI MC RVI TR RC x v MVI MC RVI TR RC x v MVI MC RVI TR RC x v MVI MC RVI TR RC x v MVI MC RVI TR RC x v Fig 8 Fig 9 Fig 10...

Page 14: ...contact BPC Figs 17 and 18 Next is to open the main vacuum interrupter MVI and hence let the current flow through the Fig 16 Fig 17 Fig 18 Fig 19 transition resistor TR Fig 19 The main contact MC is t...

Page 15: ...MC RVI TR RC BPC x v MVI MC RVI TR RC BPC x v MVI MC RVI TR RC BPC x v MVI MC RVI TR RC BPC x v MVI MC RVI TR RC BPC x v MVI MC RVI TR RC BPC x v MVI MC RVI TR RC BPC x v MC RVI TR RC BPC x v MVI Fig...

Page 16: ...switching type R The change over selector extends the regulating range to twice the voltage of the tapped winding by connecting the main winding to different ends of the regulating winding and thereb...

Page 17: ...l three phases The transformers neutral point is in the tap changer Single phase E Only one unit is required Three phase delta B Two units required Driven by a common motor drive One unit common for t...

Page 18: ...elta two units single phase and two phase Impulse withstand voltage to earth VUCG 380 kV 650 kV 750 kV 1050 kV VUCL 380 kV 650 kV 750 kV 1050 1175 kV Maximum rated through current See tables for diver...

Page 19: ...cations two or more poles of a tap changer or more than one tap changer can work in parallel However it is important to implement this in a correct way There is a difference between whether it should...

Page 20: ...verter switch The rated phase step voltage is a function of the rated through current as shown in the diagrams below Fig 36 Rated phase step voltage for type VUCG Fig 37 Rated phase step voltage for t...

Page 21: ...excellent breaking performance of the vacuum interrupters It shall however be calculated for every case Contact life The contact life for VUC type of tap changers is always 600 000 operations regardle...

Page 22: ...is not an IEC value a1 Between any electrically adjacent contacts in the tap selector not connected a2 Between the ends of the fine regulating winding across range For coarse fine switching in minus p...

Page 23: ...350 140 D 32 35 250 95 350 140 350 140 350 140 100 20 100 20 300 125 350 140 Table 5 VUCG with tap selector III unshielded version All values given as 1 2 50 s impulse withstand voltage kV power frequ...

Page 24: ...300 125 400 150 100 20 100 20 550 180 D 11 300 125 550 180 600 200 600 200 600 200 100 20 100 20 550 180 600 200 D 12 13 300 125 480 160 600 200 600 200 600 200 100 20 100 20 550 180 600 200 D 14 15...

Page 25: ...00 160 600 200 D 32 35 300 125 350 140 600 200 600 200 600 200 100 20 100 20 500 160 600 200 Table 9 VUCL with tap selector III shielded version All values given as 1 2 50 s impulse withstand voltage...

Page 26: ...0 III 450 600 700 800 N B E T 9 23 F 450 600 700 800 N B E T 9 23 VUCL III 700 1000 N B E T 12 30 III 1300 E T 16 40 F 700 1000 1300 N B E T 16 40 Table 12 1 In case of VUC E T higher values are possi...

Page 27: ...these requirements the VUC models have been designed so that the contact temperature rise over the surrounding oil does not exceed 20 K when loaded with a current of 1 2 times the maximum rated throu...

Page 28: ...Normal operation Fig 45 Operation with high leakage inductance Tie in resistor and tie in resistor switch When the change over selector operates the tapped winding is disconnected for a short time Th...

Page 29: ...resistor switch is available only for tap selector III and F Diverter switch Tie in resistor switch Tie in resistor Tap selector Main winding Regulating winding with change over selector Fig 46 Tie in...

Page 30: ...27 500 730 Table 16 Weights for type VUCG On load tap changer type designation Required oil in kg Selector III Selector F BIL Current Without oil Total Without oil Total VUCL N 380 700 1300 260 495 75...

Page 31: ...ad and environment it is recommendable to perform one maintenance cleaning and inspection during the transformer life The figure of 15 years stated on the rating plate is provided as a guideline For m...

Page 32: ...Technical guide VUC 1ZSC000562 AAX en Rev 1 Fig A L1 VUCG N E VUCL N E Fig B L1 Fig C L3 L1 VUCG B VUCL B Fig D L1 L3 Fig E L4 L3 L1 VUCG T VUCL T Fig F L1 L3 L4 Fig 49 Designation of operating shaft...

Page 33: ...For on load tap changer type Max rated through current A H2 size C mm H2 size III mm H2 size F mm VUCG N 450 600 959 1160 1491 450 800 1160 1491 VUCG E VUCG T 5 450 600 519 552 791 601 800 739 552 79...

Page 34: ...ensions type VUCG E and VUCG N with tap selector type C and cover mounting C L Tap selector C L Diverter switch Section A A Plus Minus and Coarse Fine switching Section A A Linear switching Type VUCG...

Page 35: ...e in resistor switch Fig 51 Dimensions type VUCG E and VUCG N with tap selector III and with tie in resistor switch Model for mounting on transformer s active part Model for cover mounting C L Diverte...

Page 36: ...36 Technical guide VUC 1ZSC000562 AAX en Rev 1 Fig 52 Dimensions type VUCG E with tap selector F and with tie in resistor switch Type VUCG E with tap selector F and with tie in resistor switch...

Page 37: ...hnical guide VUC 37 Fig 53 Dimensions type VUCG B with tap selector F and with tie in resistor switch Design for premounting on the active part of the transformer Type VUCG B with tap selector F and w...

Page 38: ...ings For tap changer type Max rated through current A H2 size III mm H2 size F mm VUCL N 700 1000 1300 1160 1491 VUCL E T 5 700 1000 552 791 1300 856 791 VUCL B 6 700 1000 1300 Single phase unit H22 5...

Page 39: ...ig 54 Dimensions type VUCL E and VUCL N with tap selector III and with tie in resistor switch Section A A Plus Minus and Coarse Fine switching Section A A Linear switching Type VUCL E and VUCL N with...

Page 40: ...0562 AAX en Rev 1 Fig 55 Dimensions type VUCL B with tap selector III and with tie in resistor switch Design for premounting on the active part of the transformer Type VUCL B with tap selector III and...

Page 41: ...l guide VUC 41 Fig 56 Dimensions type VUCL E and VUCL N with tap selector F and with tie in resistor switch Section A A Plus Minus and Coarse Fine switching Type VUCL E and VUCL N with tap selector F...

Page 42: ...000562 AAX en Rev 1 Fig 57 Dimensions type VUCL B with tap selector F and with tie in resistor switch Design for premounting on the active part of the transformer Type VUCL B with tap selector F and w...

Page 43: ...1ZSC000562 AAX en Rev 1 Technical guide VUC 43 49 1274 1197 37 45 79 383 626 475 202 75 213 408 1050 640 171 216 624 390 77 Fig 58 Dimensions motor drive mechanisms BUL2 BUE2 Motor drive mechanisms...

Page 44: ...en until the first maintenance stop without filling up with new oil 3 It is recommended to install the oil sampling valve with piping accessible from ground level so that oil samples can be taken with...

Page 45: ...s Single phase diagrams The tap changer can also be connected in such a way that position 1 gives a minimum effective number of turns in the transformer winding with the tap changer in position 1 Even...

Page 46: ...ms for VUCG C Linear Plus Minus Coarse Fine 7 steps Number of loops 7 Number of tap positions 8 8 steps Number of loops 8 4 4 4 Number of tap positions 9 9 9 9 steps Number of loops 9 Number of tap po...

Page 47: ...r VUCG C Linear Plus Minus Coarse Fine 11 steps Number of loops 11 Number of tap positions 12 12 steps Number of loops 12 6 6 6 Number of tap positions 13 13 13 13 steps Number of loops 13 Number of t...

Page 48: ...for VUCG C Linear Plus Minus Coarse Fine 15 steps Number of loops 15 Number of tap positions 16 16 steps Number of loops 16 8 8 8 Number of tap positions 17 17 17 17 steps Number of loops 17 Number of...

Page 49: ...C Linear Plus Minus Coarse Fine 20 steps Number of loops 10 10 10 Number of tap positions 21 21 22 steps Number of loops 12 11 12 Number of tap positions 23 23 24 steps Number of loops 12 12 12 Numbe...

Page 50: ...C Linear Plus Minus Coarse Fine 28 steps Number of loops 14 14 14 Number of tap positions 29 29 30 steps Number of loops 16 15 16 Number of tap positions 31 31 32 steps Number of loops 16 16 16 Numbe...

Page 51: ...iagrams for VUCG III and VUCL III Linear Plus Minus Coarse Fine 4 steps Number of loops 4 Number of tap positions 5 5 steps Number of loops 5 Number of tap positions 6 6 steps Number of loops 6 Number...

Page 52: ...CG III and VUCL III Linear Plus Minus Coarse Fine 8 steps Number of loops 8 4 4 4 Number of tap positions 9 9 9 9 steps Number of loops 9 Number of tap positions 10 10 steps Number of loops 10 5 5 5 N...

Page 53: ...II and VUCL III Linear Plus Minus Coarse Fine 12 steps Number of loops 12 6 6 6 Number of tap positions 13 13 13 13 steps Number of loops 13 Number of tap positions 14 14 steps Number of loops 14 7 7...

Page 54: ...I and VUCL III Linear Plus Minus Coarse Fine 16 steps Number of loops 16 8 8 8 Number of tap positions 17 17 17 17 steps Number of loops 17 Number of tap positions 18 18 steps Number of loops 18 10 9...

Page 55: ...nd VUCL III Linear Plus Minus Coarse Fine 20 steps Number of loops 20 10 10 10 Number of tap positions 21 21 21 21 steps Number of loops 21 Number of tap positions 22 22 steps Number of loops 12 11 12...

Page 56: ...VUCL III Linear Plus Minus Coarse Fine 26 steps Number of loops 14 13 14 Number of tap positions 27 27 28 steps Number of loops 14 14 14 Number of tap positions 29 29 30 steps Number of loops 16 15 1...

Page 57: ...1ZSC000562 AAX en Rev 1 Technical guide VUC 57 Appendix 2 Single phase diagrams for VUCG III and VUCL III Linear Plus Minus Coarse Fine 34 steps Number of loops 18 17 18 Number of tap positions 35 35...

Page 58: ...diagrams for VUCG F and VUCL F Linear Plus Minus Coarse Fine 4 steps Number of loops 4 Number of tap positions 5 5 steps Number of loops 5 Number of tap positions 6 6 steps Number of loops 6 Number o...

Page 59: ...VUCG F and VUCL F Linear Plus Minus Coarse Fine 8 steps Number of loops 8 4 4 4 Number of tap positions 9 9 9 9 steps Number of loops 9 Number of tap positions 10 10 steps Number of loops 10 5 5 5 Num...

Page 60: ...F and VUCL F Linear Plus Minus Coarse Fine 12 steps Number of loops 12 6 6 6 Number of tap positions 13 13 13 13 steps Number of loops 13 Number of tap positions 14 14 steps Number of loops 14 7 7 7...

Page 61: ...and VUCL F Linear Plus Minus Coarse Fine 16 steps Number of loops 16 8 8 8 Number of tap positions 17 17 17 17 steps Number of loops 17 Number of tap positions 18 18 steps Number of loops 10 9 10 Num...

Page 62: ...VUCL F Linear Plus Minus Coarse Fine 22 steps Number of loops 12 11 12 Number of tap positions 23 23 24 steps Number of loops 12 12 12 Number of tap positions 25 25 26 steps Number of loops 14 13 14...

Page 63: ...le phase diagrams for VUCG F and VUCL F Linear Plus Minus Coarse Fine 30 steps Number of loops 16 15 16 Number of tap positions 31 31 32 steps Number of loops 16 16 16 Number of tap positions 33 33 34...

Page 64: ...opyright 2015 ABB All rights reserved 1ZSC000562 AAX en Rev 1 2015 04 15 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 electric...

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