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
- 21582 Views
- I also Faced
- E-Mail Answers
Answer Posted / j.ikesavan
my friend please check your inter lock system how to
working motor on load tap changer your winding failure its
going up and down voltage thats why this disc is breake.
| Is This Answer Correct ? | 1 Yes | 4 No |
Post New Answer View All Answers
How to calculate the current of Highpressure Mercury Vapour Lamp?what is the basis?whether we have to consider power factor or not?
Which standard we are following earthing resistance test
how we can decide that what value of ht line will come to any commercial building? (ans except According to the building load)
tell me about eletrical contractor
As i want some model question paper in basic computer science and history please send me immediately sir
what r substations?what r there work?why voltages r incresed and then reduced during distribution of power
Define sensitivity?
Factory acceptance test. FAT. For 132 kv transmisstion towers what is that meaning and what are the tests commonly companies perform now days.
What do you mean by dependent and independent voltage sources?
how to calculate differential current when we testing differential relay..suppose we have 1000kw generator,630amp VCB,what value we should put /inject so that relay trip the VCB? PLLZ justify ur comment
as a electrical student why should i hire you?
What is super thermal power plant? and how it will differ from normal thermal power plant
Why should we hire you over the others waiting to be interview?
I use 20 nos led tube 4feet, in pathway 100mtr approximate, so what size cable i use for lighting
What are the operation carried out in thermal power station?
