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POWER SYSTEMS

Power Systems
Earth fault relay uses the which of the following sequence currents?

 zero sequence
 negative sequence
 positive sequence
 any of the above

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Power Systems
Which of the following grounding is not practically preferred for protection of equipments?

 resistance grounding
 isolated grounding
 reactance grounding
All of these

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.7 pu, Zm =0.2 pu
 Zs = 0.6 pu, Zm =0.5 pu
 Zs = 0.2 pu, Zm =0.7 pu
 Zs = 0.5 pu, Zm =0.6 pu

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Power Systems
In which of the following given faults, all the sequence currents are equal?

 LL
 LLG
 LLL
 LG

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Power Systems
If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

 LLL
 LG
 LL
 LLG

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