how to understand the controling circuits example star- delta-starter controling daigram please let me know

3 Answers   GMR,

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what is different between 51N and 51G functions relay?

1 Answers  

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What is the effect on in Zone and out zone fault if Phase side CT is Vk/2<30 mA and Neutral side is CT is Vk/4<30 mA for Transformer REF protection

0 Answers   ABB,

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how to measure the A.C flux .-instrument

8 Answers   NTPC,

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I know the Capacitor value- 12.5KVAR, voltage 440V gas filled, then what is the formula for calculate the microfarad value for this 12.5KVAR capacitor

2 Answers  

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What is the diff btw Conventional & Addressable Fire Alarm System???

5 Answers   Emerson,

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We have Diesel generator of 200KW. fuel consumption is always same,even connected light load or full load. Is it right?

0 Answers   ARDE,

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How one can check the MAIN of a house wiring ?

0 Answers  

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Define phase lag and phase lead?

0 Answers  

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when voltage increases then current also increases then what is the need of over voltage relay and over current relay? can we measure over voltage and over current by measuring current only?

1 Answers  

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do we people experience any shock if we catch any one of the three phases (R Y B)in air with out touching ground.

7 Answers  

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I have a transformer 3phase 11kv/410v and its name plate missing. now how can I judge its rated kva?

2 Answers   Coca Cola,

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