what is the different between HT auxillary relay resistance and transformer tripping relay resistance?

0 Answers  

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in communication what is the role of elelctrical engineer?

3 Answers   Quippo, Reliance,

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What is pi controller?

0 Answers  

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why generation is done in delta nad transmission in star? brief

3 Answers  

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what is the right method of laying cable tray if we are using EOT crane in shed, better is below or up

1 Answers  

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what is the working difference b/w softstarter and Variable frequency drive ?

6 Answers   Parle,

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Why C.T secondary s2 done earthing?

4 Answers  

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what is the difference between thyristors and capacitors

2 Answers   DRDO, ETE,

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what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?

0 Answers   Faurecia,

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wath is skin effect?

9 Answers  

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What is the necessary and sufficient condition for stability.

0 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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