what is use of stater and choke in tube light.?

2 Answers   Aditya Birla,

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What is maximum demand and contract demand?

5 Answers  

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what does a string of resistors in a series will do?

0 Answers  

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What is metering cubical? What is the use?

2 Answers   HSL,

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Why in India only 50hz frequency not 60hz

2 Answers   Prism Cement,

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what is recommended breakdown voltage of transformer oil?

5 Answers  

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What is the meager?

6 Answers   ABB,

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What is the function of the circuit breaker failure relay?

0 Answers  

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photo conductive cell

4 Answers   Bhel,

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what happen if we give 220 volts dc supply to d bulb r tube light?

9 Answers   NHPC,

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what are the types of 3-ph. generator protection

2 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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