in the directional overcurrent and earthfault protection,normally we are setting the angle 45 deg lead for phase fault overcurrent and -45 deg lead for earthfault fro forward direction.but both the fault are operating on the same angle region only.why?how the relay will response?

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why the making current is more than then the breaking current and if its true then its about a controling circuit or breaker power contact points

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why do we use 3 single phase instead of one 3 phase?? though vee connection is its advantage but what is the hidden reason behind it??

2 Answers  

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HOW COULD A SINGLE PHASE INDUCTION MOTOR ROTATE IN OPPOSITE DIRECTION???

3 Answers  

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why neutral can not used in three phase motor connection?

1 Answers   HSL,

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how meger function

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what's mean by Transient stability analysis?

1 Answers  

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At what speed an electric car can run with 2 HP motor of weighing 400 kg?

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I Want randstand placement papers

0 Answers   Randstad,

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I have 4 DG set with 1500KVA rating. system breakers are 11KV & alternator are 415 Volts. Between alternator & breaker one stepup transformer used. i want to Know what is max. resistance for body earthing & 415 & 11KV V Neuteal earthing. my fault current is 14 times for 2 sec.

0 Answers   Jindal,

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when any relay trips in any ckt then what type of setting is there in motor?what is function of relay in that ckt?

3 Answers   Finolex,

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how to calculate the mf of kwh meter,if ct the ratio on meter is 100/5A

2 Answers  

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