Answer Posted / h s sandhu

VFD means variable frequecy drive,If voltage is reduced then speed will reduce.

What is zero of the system?

641

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what is meaning of bus riser

1948

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How will be the single line diagram of series trip HT breaker? how it works?

2092

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PLEASE TELL ME ABOUT QUESTION PAPER OF UPCL ENTERENCE EXAM.

7031

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Explain how to determine capacitor tolerance codes?

623

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what exactly commisioning work does in electrical site work... LT side?..

1500

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What is K-rated transformer? What is the use of it? What can be the size(pls provide calculation if possible) of K- factor transformer for 550kW,690V motor operating with drive (VFD)?

1796

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what is the easiest method of short circuit current calculation ? pls. derive with a mathematical example in real life application.

1972

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I have 2500KVA transformer delta/star,13.8KV/380V provided with LV 4000A breaker. Already I have 2300KW motor feeder with a full load 90%. Is it possible to connect another 1600A from that breaker? If so how the calculation is done?

3371

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In Generator How suction compression power and exhaust works ?

1450

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How to calculate KVA/VA rating of PT or CT from primary & secondary voltage or primary & secondary current?

1989

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th how could we differentiate between armoured copper and armoured aluminium cable what is the basic application? why we prefer the armoured copper as compared to armoured aluminium.

1463

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What is the difference between shortcircuit current, rated current of cable & MCB with example? What will be the size of cable required for 5.5 KW motor (Full load current 10 Amps approx.), Starting current with DOL is 120 Amps. Aprrox. Short circuit current with LLLG fault is 2000 Amps Approx.

1583

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Pl.brief me about Electrical power distribution system from Main generating station to Industry.What is the use of in between station.

1594

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What willbe change in programming when we use 5/3 solenoid inplace of 5/2 in operating of a cylinder?

1610

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