Answer Posted / m bilal akram

yes we run motor long time with use of VFD because VFD
maintain V/F ratio every time.

what is vA rating and class of a ct.

1841

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what is the problem when i want to close a circuit breaker by local position it closes well.but when i close it in remote position it trips

1584

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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.

1856

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Differentiate between real and apparent power?

1140

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i want bhel placement paper for electrical if anybody having pl send to my id kavitha867@myway.com immediately

1964

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Is it required to lay 2 runs of GI wires along with armoured cables from one power DB to another Power DB?

1927

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area control error

1715

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Does magnetomonopoles exists? one maxwell equation strongly suggests no, but how about their existance in plasma?

1987

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what is d check in dg 1500kva

2106

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would the same effect be achieved by reversing the connection to one winding of the induction motor 3-phase?

1788

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what are the main applications of transistor in non-linear region?

2028

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The shot circuit in any winding of transformer result? Explain

1310

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What are the factor to be consider for CT selection in 132kV substation?

2054

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What is a system?

1191

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why to use freewheeling diode ( diode in revers bias mode) across dc coil

4987

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