for selection of transformer we will considering 5 to 6
times of starting current of higher rating motor connected
to secondary side. according to process wise we will start
the motors gradually suppose if we will start 15 to 20
motors at a time wat will happen?
Answer / wareagle
If you start all of the motors at the same time then you
will have the sum of the lock rotor amps time the number of
motors occurring at the same time. You may trip the primary
transformer breaker.
Is This Answer Correct ? | 4 Yes | 0 No |
what is the difference between surge arrestor and surge supressor
why did youi choose this career?
what are the applications of PLC?
why electron flow is opposite to current flow?
What is DPR relay, And what for??
What is the technical reason for adopting color coding of three phase system as RYB.
how to calc. current for 5MVAR,50hz,33kv
why in power staions distriution r like 11kv,33kv,66kv in india?
why generation voltages are 6.6kv or 11kv and why not some one give that stander that generation voltages are 5kv or 12kv?
What do you mean by ACB and VCB?
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.
Why in celling fan stator are rotatig while rotor are steday