At what condition differential relay will act in transformer and ht motor?

1 Answers   Equate,

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why transmission is done in delta system

4 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 are stable systems?

0 Answers  

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For high frequency application we use which transformer?

0 Answers  

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1-What is the difference between absorption factor and polarization factor in insulation resistance test in transformers? and why we inject until ten minutes to get polarization factor?

1 Answers  

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How much difference can there be between HT & LT KWH unit consumption at the same load?

1 Answers   DLF,

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how to save the power?

2 Answers  

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What is chopper

1 Answers   Enercon,

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what is maximum demand.

9 Answers   HP,

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HI SIR, AM PREPARING FOR RRB FOR SECTION ENGINEER POST. PLZ SEND ME THE PREVIOUS QUESTION PAPERS AND HELP ME. I HAVE NO ENOUGH TIME MY EXAM DATE IS 22ND JUNE.... MY EMAIL ID IS nalla.amarnath@gmail.com

0 Answers  

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why we use 11 kv 22 kv and so on ?

1 Answers   Air Force,

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