why dc is used in control circuit for mv & hv switchgear instead of ac

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At what point crngo works like as crgo

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how terminal voltage increases when load is capacitive (leading pf load)? (explain practically what is happening, not using phasor diagram

1 Answers  

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Why the bypass and blocking diodes are used in solar modules?

1 Answers  

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what is safety measures of transformers.

16 Answers   Amtek, Hotel Jobs, HP, RMU, SKFM, Taj Group,

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what is linear motor?

2 Answers   Lucas TVS, wbsedcl,

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1.what type of wave is produced from i.online ups ii.offline ups iii.inverter.why don't we use inverter instant of offline ups for computer,what's the reason?

2 Answers  

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what is mean by PIR in circuitbreaker and give me detail of that?

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the single phase voltage is 230 volts and threee phase is 430 v.why three phase is not 660 v?

2 Answers  

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how can get electrical "c" licence.i am complited in DEEE.PASSING YEAR OF 1993.WORKING IN PVT COCERN LT LINE.PLEASE ADVISE ME .CELL NO 9994786021

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how to calculate unit consumption on 3phase 380-415 v0lt kilowatt motor eg ( 55kw,380v,3phase 50-60hz)

1 Answers  

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On load tap changer (OLTC) explode? Transformer Vector group: Ynd11 Rated Power: 353MVA Rated Current: 693A Voltage:294/20KV OLTC Type: T III Y1000 110/c 12193w Max Operation Current: 295A Step Voltage: 550V Arrangement in Tx windings: Y Connection Problem: Damage of Unit 1 Generator Transformer On Load Tap Changer (OLTC) Description of Incident: 9.00 a.m. :- Generator No Load test on excitation system started 10.30 a.m :- Carried out AVR change over test 11.30 a.m :- Preparation for Generator Manual Synchronizing test 12.00 a.m :- Manual Synshronizing test started. Observed incoming generator voltage higher than running voltage. CECR operator operated Generator Transformer OLTC to bring down the incoming generator voltage 12.03 a.m :-Generator Transformer abnormal alarm operated at Gen.Control Desk (CECR) CECR operater at Generator transformer bay informed that the transformer oil splashed out from OLTC. CECR operater informed that he heard explosion inside OLTC. Observed Oil level & Oil Flow alaram operated at Tranformer local annunciator. 12.05 am :- CECR operator 'Open Gen Field Breaker” 12.10 a.m. :- Elec1 team inspected the OLTC and found the OLTC rupture disk was broken and oil spilled at OLTC area. - Elec1 found the OLTC top cover bulging. Do anyone know why and possibility cause happen in this OLTC.

9 Answers  

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