Answer / ajay sharma

Angle of Lag and lead between voltage and current is known as power factor.

Power factor is always less than one. And in ideal case it is unity.

Answer / rama maddileti

*The cosine angle between voltage and current is called
power factor.
* power factor =(active power/apparent power).
*The power factor is improved by connecting capacitor in
that circuit.

what is tertiary winding in transformer?What is its purpose?

18 Answers   Bhel,

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What range of speed can you get with the armature control method of speed control of d.c. Shunt motor?

0 Answers  

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In LT cables 3.5 core cable are available that means 3 core and .5 for neutral Why .5 for neutral and is there any reason for that please suggest thanks and regards pavan kumar

1 Answers   Sodexo,

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Under wat condition statcom operates as an inductor for the transmission line?

0 Answers  

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why the Parameters : Base Voltage & Maximum Voltage can't be equal in value in a VFD (Variable Frequency Drive) ? How much the base voltage would be lower than the maximum voltage ? If 400 V is the 3 phase output of a VFD ... then what should be the base voltage ? thanks a lot

1 Answers   Yaskawa,

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1 Answers   Kay Bee,

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1 Answers  

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what is feeder bay?

0 Answers  

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why to use 50hz only in tansmisson and as well as in distribution why not60hz?

2 Answers  

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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  

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why in motors dc extitaedtion is prefer

1 Answers  

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How will u calculate wire size according to current rating?

2 Answers   Global Computer,

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