Answer / niranjan

Its braking the motor by reversing the current direction in the circuit, it can be done by interchanging the the two supply terminals, in case of DC and in AC three phase, it can be done by interchanging any two lines of the three lines.

what is difference between ac voltage and ac current

3 Answers   TATA,

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If 24 KVA AVR having Input voltage 200-400v, Output voltage 415+-1%, what will be the voltage if Load is 13A.

0 Answers   Sterling Wilson,

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What is converter transformer? Diff b/w converter transformer and distribution transformer? why we use converter transformer in place of giving supply to drives?

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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hi this is hema, r there any books in particular for the preparation of the APPSC-A.E.E(electrical), if so please mail me the names ... thank u .

0 Answers   Vizag Steel,

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why steady state stability limit is greater than transient stability limit ? How it can be explained ?

0 Answers  

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What is the problem, if a circuit breaker is not closing.

4 Answers   KSEB, L&T, Siemens,

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what is the difference between active power and reactive power and apparant power in practical as well as theoritical

0 Answers  

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For 132 KV line, PT or CVT which is prefered for measuring & protection? is there any IS or IEE standard available?

1 Answers  

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Why electrical power generation and transmission done in 3 phase system not more than 3 phase ?

0 Answers  

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DG Earth Value?

0 Answers   Reckitt Benckiser, Vodafone,

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why transformer calling in VA rating

6 Answers  

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