Answer / sunil solanki

circuit breaker operating time & tripping time should be in
ms.also tripping time should be less than operating time.

Answer / barkha thakur

Circuit breaker operating time & tripping time should be
few cycles of the supply voltage

Answer / electrix

Cicuit Breaker Opening / Closing time are always in milli
secs. usually in 11 kv breakers it is around 60 - 80 ms for
closing and 40 - 60 ms for opening.

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?

0 Answers  

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Can step down transformer works as step up one???

2 Answers  

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how does capacitor oppose sudden chane in voltage? how does inductor oppose sudden change in current?

4 Answers   AAA, Iqra University,

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how can check the resistance of battery contact?

0 Answers   Cipla,

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whats the advandage of PMG in alternator?

2 Answers  

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Cables Construction hi friends, 0.6/1/1.2 kV LV , DC and Control cables are concentric copper conductor what does its means and what is the use of concentric copper conductor,and are this with copper tape shield or copper screening, ? thanks

0 Answers  

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What are the functions of different probes used in cro?

0 Answers  

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HOW DO YOU PROVE THE HIGH VOLTAGE CABLES OR BUSBAR IS DEAD EVEN AFTER IT IS DE ENERGISED

6 Answers  

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is there any role of power factor with frequency variation? and how we can manage the frequency variation?

0 Answers   Wipro,

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why capacitor bank is not used in generator power

7 Answers   Caterpillar,

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HOW CAN I GET 5CORE HO7 CABLE SIZE IF I HAVE 1800A?

0 Answers  

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main difference between ac and dc?

0 Answers   Classic Network,

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