Answer / gopi

electrical earthing is the basic step to be taken for
protection of personnel and equipment in case of fault like
over current and over voltage conditions. even system
equipment should earthed to prevent damage of internal
equipment.

Answer / saravanan

to aviod electric shock in humen. . in eqipment protection
used for fuse..over load relay etc..

Answer / syam mohan

through earth the return path of the distribution system
completes

Answer / eduardo

Sorry. There is another reason that I have completly forgot.
I am not sure about the english term but I think is "static
electricity". Electrical charges apeares in an isolating
material with friction and they must be discharge to the
earth. Examples are for the buildings that create electrical
charges with the wind. So to discharge them you must connect
it to earth. Another very well known example is for
combustibles. As the electrical charges in pipes or in
trucks can create a spark (bolt) and they are a potencial
font of ignition. Normaly both trucks, pipes, and fuel tanks
are connetct with eachother and also to earth.

Answer / eduardo

None.
In the power transformer is useful only for having a
reference of the power voltage relating to the earth.
We can calculate for instance the degree of isualtion we
need. For example, an electrical cabinet, that is connect to
the earth, (they do not lies in the air) and have lives
conductor.

Pls tell me whether we can use EN3A material for shafts of Permanent magnet alternator.What will be the effect of magnetic and nonmagnetic material for shafts on magnetic properties of PM rotor .

0 Answers  

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For a stable system, where should the poles of a system be in a root loci plot?

0 Answers   GE,

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how many synchronous motor are there in any power plant

0 Answers   L&T,

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What do you meant by soft start?

1 Answers  

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1.How to calculate backup time from series connected battery of 12v dc with 26Ah for 2battery?

3 Answers  

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transform oil how going to act like ainsulation purpose

1 Answers   Siemens,

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how to store the thunder power?

1 Answers   Voltech,

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0 Answers   Apollo,

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How much Fault current can be contributed by a motor?

4 Answers  

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how indusrial diesel generator work

0 Answers   Johnson and Johnson,

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Can we parallel lise the secondary side of the two similiar transformers with same voltage ration, imp, but with different vector groups.. ( for ex. 11 KV / 6.6KV two trfs but different vector groups can we parallelise both of them ,, what happens if we parallelise them

1 Answers  

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Explain and give examples about VCB?

0 Answers   AZ Engineering, Vodafone,

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