why and where we use early make & late break contacts in protection?

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What is the lifetime of a Thyristor? Is there a recommended lifetime for thyristors after which they should be replaced?

0 Answers  

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is it necessarry to charge the battery of ups always??

3 Answers  

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Why voltage regulation of an alternator is negative for a leading power factor?

3 Answers  

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Efficient electrical earthing in hard rock area

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what are eddy currents

2 Answers  

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The undesirable property of an electrical insulating material is

3 Answers  

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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

0 Answers   Premier,

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what is difference between di electric and insulator?

2 Answers   Greenko,

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why r we using shell transformer for low voltage

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What are the circuit models used for analysis of medium length transmission lines? Which one is superior? Support your answer.

1 Answers   UPSC,

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can anyone provide me a amf panel control wiring using ec-2 relay?

0 Answers   Electro Tech,

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