What is a signal flow graph?

0 Answers  

---

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  

---

How to take Vector group test of Transformer?

16 Answers   Sunflag Steel, Zuari Cements,

---

5MVA TRANSFORMER SUDDENLY FAIL WITH THE PRV TRIPPING AND LARGE AMOUNT OF OIL SPREAD OUT? SO IT CAME BACK WITH THE REPAIRING WITH REASON THAT IT FAILS BCOZ OF TRANSIENT EFFECT? SO PLZ EXPLAIN HOW DOES IT HAPPENED?

1 Answers  

---

Why we use mostly circular coil in transformer? not square or rectangular type of coil.

4 Answers  

---

---

What is star-delta transformer?

0 Answers  

---

what is the advantage of connecting capacitors in delta than in star?

0 Answers  

---

How to measure the capacity/rating of a distribution transformer in KVA?

0 Answers  

---

If increased the frequency up to 1000 then what changes shows in voltage?

0 Answers  

---

why do we use magnetic contactors ?circuit breakers are not enough?

5 Answers  

---

gd eve frndz my qstn is how convert sound energy to electrical energy

1 Answers   HCL,

---

what is the principle of operation of synchronous motor and generator? explain in detail.

2 Answers   Maruti Suzuki,

---