what is power factor?

8 Answers   Adani, Blue Star, Power Control,

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Why Drives are used to run AC motors?

3 Answers  

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IN OLTC we observed "OUT OF STEP" Alarm, we have two different transformer, when both are in parallel this type of alarm observed. what's the meaning of this alarm and why it occurs???

3 Answers  

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why mostly conductor made by 7 nos wire?

1 Answers  

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what is the working process of over & under voltage relay.

0 Answers   NTPC,

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if field current decreases how can the speed increase in the unloaded dc series motor

1 Answers  

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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

0 Answers   Lupin,

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define as synchronous generator

0 Answers   Enercon,

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how to calculate the load on transformer..????

2 Answers   Bhel,

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Natural frequency of a system gives... 1) nature of transient 2) overshoot 3) oscillations 4) speed of response

1 Answers   CCP,

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where we use zero sequence current transformer or core balancing ct.

2 Answers  

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what is the difference between R Y B windings in three phase.does it differ by construction or by number of windings?Explain the difference between them.

3 Answers  

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