Why Diffrential and Ref relays are used together although Diffrential relay can protect Pri and Sec of Transformer

1 Answers   Qatar Gas,

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WHAT IS THE FUNCTION OF RCCB

2 Answers  

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whatdo mean by chopper fed drives.used for ac drives.

0 Answers  

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Draw the DOL starter and star delta starter drawing?

0 Answers   Danfoss,

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How to calibrate or test an LT Air Circuit breaker 440 volts, 35 KA, 800 Amps ?

0 Answers   ABB,

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i want prepare power grid exam what are book we want refer for electrical ?

5 Answers  

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In Indian Household, generally we receive 220V AC single phase supply. But AC has 2 phases, +ve & -ve. So in +ve half cycle current is flowing...so what happens in the -ve half cycle?? Please illustrate.

0 Answers  

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A dc motor running on dc drive whose input is 3ph AC what will happen if we change the phase sequence of dc drive for e.g (R Y B) is connect as R B Y, will the motor run as same as previously running before changing phase without any effect

4 Answers  

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how power can be saved using VFDs in detail explain

1 Answers  

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What are the electrical engineer roles and responsibilities in chemical plant?

0 Answers  

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If we says that current is flow only when there is closed path & neutral work as a return path for the same. Then how circuit is closed in three phase as no neutral available ??

1 Answers   Nimbus Harbor Facilities Management,

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WHAT HAPPENS IF STARTER OF A FLUROSCENT LAMP IS SHORT CIRCUITED AND WE PUT THE SUPPLY ON?

1 Answers  

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