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
- 21571 Views
- I also Faced
- E-Mail Answers
Answer Posted / sakono
May be explode from
1. During moving the OLTC contact, some part was lossen and
OPEN circuit occure.
2. Some material of OLTC was fail and loosen. then the OPEN
circuit was occure in OLTC.
3. Contaminate inside OLTC chamber
4. Oil was contaminated
5. TAP Position of OLTC was not in step.
| Is This Answer Correct ? | 1 Yes | 2 No |
Post New Answer View All Answers
sir i have a car stereo system and there is jack on him so can u tell me a way to find out their power terminals on the jack or on the circuit board"
I have two PLC processors. I want to communicate both processor with each other. How i can do so?
how to conduct dc resistance test for rotor of an alternator and how to measure the rotor dc resistance value theoritically?
how to calculate mf when meter and cTPT detail are given
how braking & making capacity of circuit breaker are calculated?
what is diff btw electric,magnetic & eletromagnetic field
How shall i select the value of capacitor or inductor in a system?
Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632
which stabilizer is better ? AVR, Servo Stabilizer, Static stabilizer etc & why explain it
on a three-winding transformer relationship delta-delta-star, on third winding why the relationship is a star? what are the advantages and disadvantages? Thank you and please help
What is the difference between a 3 winding and 2 winding Potential Transformer
What is the different types of cable & current capacity of cable
how to find number of run cable laying[LT side] for transformer & alternator secondary side? [above condition for getting output power transformer to main panel side] give the example.
tell me some type of questions throught which i can prepare for exam and do my best
what is the minimum winding resistance of 30hp compressor, to run or to switch on
