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Auxiliary relay used for standby protection of electrical circuit when main relay fails to operate.
PLA relay used for feedback purpose.its work like a NO NC .

What is the pratically meaning of neagative going ac current.

1 Answers  

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Why Generator rotate only clock wise ?

8 Answers   L&T,

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How much current can 11KV line carry? What are the formulae used to calculate current across both side of transformer? Moreover I need to know can I connect 33KV line with transformer of 1600KVA? Details are: V=415, Pf= .9

3 Answers  

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what is difference between earth and ground?/

3 Answers   Sree Rayalseema Green Energy Limited SRGEL,

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how much kn lightning arrestor is used in 11kv line

8 Answers   Power Grid,

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what is meant by VFD ?where its useful ?

7 Answers  

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If a surge divertor is required to be protected by 32 amp C Curve Circuit breaker does this limit the amount of protection from surges that you will acheive

0 Answers  

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what is the basic difference between capacitor and condenser ?

17 Answers   ABB, Essar,

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What happen if 1200KW/1500KVA alternator runs at no load and high R.P.M.for one minute?

6 Answers  

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What is the function of a capaitor in 1-phase IM?

1 Answers  

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why synchronous motor is not self starting

5 Answers   Cenored,

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In dc motor starter there is less voltage required for holding contactor that's may why it is called no volt coil. but in ac starter why holding contactor is called no volt coil.

2 Answers   JSW,

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