Answer Posted / sk. rafi ahmed

short ckt is a faulty condition of an electrical ckt where the live conductor gets connected with the neutral conductor or two live conductor of different phases gets connected.

a system is said to b overloaded when a user trys to extract a power more than the rated capacity of the system.

EHV current carrying parts need to have smooth finish,then how can a 245kv GIS with emery finish can run so long?

1895

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why constant voltage transformer should be start without load? and if started then what will happen?

2047

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How to know any size of cable if there are not written on cable? Answer must be theurical not by experience.

2127

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This is urgent!! What is a Thyristor-based 3-ways selector switch with Zero crossing control? how does it operate and where is it mostly found in a system?

2071

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what is a bus riser in power system and why it is used

46219

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What is the purpose of stand by earth fault protection for transformer ?

2085

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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.

2044

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what is the value of combined earthing in general electrical circiut?

1906

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What is the most essential condition for the voltage build up for a d.c. Shunt generator?

1153

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how can i get the formula to find out the cable size if i know the load of main fuse protection.

1939

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How to check the Bushings of the transformer?

1815

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What is creepage distance..... what will be the value for different voltage level

1979

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if the armature current in a dc generator is ac ( sinusoidal ) why doesnt the sjhape af armature mmf a sinusoidal (ni) ? armature mmf in case of a dc machine is triangular.

1973

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Where servomechanism is used?

1111

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dg earth connect only in the amf panel or not why

2090

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