Answer / vinod

for 3 phase balance phase voltage, earth fault detection
and humen/equipment safety

Answer / kavi

Fcuk damnit, distribution transformer earthing is required
to provide a zero reference for single phase loads, assuming
TT distribution. It balances the phase currents. Balanced
loads rarely exists on distn trx. Also, the third harmonic
current generated due to magnetisation of the core will be
grounded.
Power tx require grounding for the latter purpose and for
insulation reasons. more economical to fabricate a tx with
phase voltage insulation than delta.

Answer / ayid

for balancing purpose and safety particularly 3phase tx

Answer / chinmaya

Earthing is required for grounding the excess current.

Answer / sarvesh singh

earthing is done as to complete the circuit. Else it could
also be connected to a neutral wire. In many houses there
is one wire connection i.e. live wire and for the neutral
we use as a ground. in transformer in primary there could
be some current in neutral wire so we need earhing so as to
have proper output voltage

In separately excited m/c,we excite the field by a dc source,what not with ac source?

1 Answers  

How to calculate total harmonic distortion level(THD) in VFD? and how can we reduce harmonics?

0 Answers   Apollo,

Why IGBT is very popular nowadays?

3 Answers   TVS,

why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?

0 Answers   Siemens,

explain which quantities change in the starting and the and the running condition in induction motor

0 Answers   Gulf Spic,

why ceiling fan give hising sound

2 Answers  

what is the formula to find battery back up of ups?

3 Answers  

Find active & Reactive Power transmitted in a transmisston line having Vs30 degree(sending end) to Vr(zero degree)at receving end with line inductance X ohm. Vs(30degree)-------------------Vr(zero degree) X ohm

3 Answers  

when the size of the cable used for the ht voltage is 300sqmm then what is the size of the conductor of each phase

2 Answers  

Our Alternator nameplate specifies a power factor of 0.8. When the Alternator is on light load, the bus bar voltage rises to 11240 volts, whereas the standard value is 10500 volts. Is it ok to increase the power factor to 0.85 or 0.9. I am afraid because the power factor on the name plate is only 0.8 ?

3 Answers   Escube,

at the time of starting back emf of a motor is zero.so how can it will start to run??

1 Answers  

what is first pole to clear factor

1 Answers