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.

what is the difference between line voltage meter and relays

4 Answers   TCS,

I am experienced with house and industrial wiring but I don't have any licence how can I apply an licence and which type of licence i can get i didn't complete deee just only experience

0 Answers   Future Electrical,

How to test the vector groups of 3 winding transformer & phase displacements

2 Answers  

Why we choose 400kv,220kv,132kv,66kv,33kv transmission voltages for transmitting power. Why not other voltage levels.

21 Answers   College School Exams Tests, HC, HCL, Jaypee, JPMorgan Chase,

What exactly is meant by harmonics and harmonic current?? and what is skewing with regard to this??

2 Answers  

Why CT secondary is grounded?

4 Answers  

Why the capacitor bank is keeping on for electricity supply and keeping it off for generator supply

3 Answers  

What's the part of OTCC in transformer?

7 Answers   Bhel, RRB,

Why motor initial starting current is high?

9 Answers   Pennar,

In transmission line 11kv,33kv etc are rms values are peak or others??

1 Answers  

witch pump used in wtp

0 Answers   Dalkia,

I have one ct of ratio 3000-2000/1 Amp its knee point voltage mentioned on name plate is 500-333/30mA-50mA at Vk/2. in secondary box there is three terminal named 1S1, 1S2, 1S3 then on which terminal obtained the knee point voltage ie 1S1-1S2 OR 1S1-1S3 & also specify the knee point voltage for the ratio 3000 from name plate.

0 Answers