Interested to Buy Any Domain ? << Click Here >> for more details...
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
- 21212 Views
- I also Faced
- E-Mail Answers
Answer Posted / sudheer
please check the OLTC inside
connections ,carefully .because some times the connector
plate rollers not touch properly. so the winding temp.
increases continuously and oil will over-heated.
| Is This Answer Correct ? | 1 Yes | 3 No |
Post New Answer View All Answers
sir i am apearing for nic exam.i dont know exam pattern.can you please send me some model papers
how to calculation increase power factor for single phase
Why use in ht motore
What is meant by short-pitched winding?
What is zero of the system?
What Is Connection APFC Panel In Compony.
what is per unit calculation?looking for simple and strong explanation thk u
what is value of Jin transformer
How i can decide that HVDC line is best for transmission.
why starting current is high and resistance is almost 0 during the starting of motor dc motor...?
what do u understand about FACTS? how they are useful?
how many parameters can integrate with fire alarm basically ?
i need list of swg(standard wire guage) or area of conductor v/s current carrying capacity of conductor copper & alluminium...
How to determine the breaking capacity such as break down current and break down voltage for VCB and CT's.
Why is water motor not taking the pressure? what is the problem?
