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k.prakashchandra


{ City } karkala
< Country > india
* Profession * rtd e.e.
User No # 54717
Total Questions Posted # 0
Total Answers Posted # 521

Total Answers Posted for My Questions # 0
Total Views for My Questions # 0

Users Marked my Answers as Correct # 1317
Users Marked my Answers as Wrong # 527
Answers / { k.prakashchandra }

Question { 3024 }

What is the electrical difference between Earthing Switch (ES)
and Maintenance Earthing Switch (MES)?


Answer

The first one is for lines and the other is for the station

Is This Answer Correct ?    0 Yes 0 No

Question { Vestas, 4022 }

Dear sir,
I am working in wind mill division , pls explain

Pls explain in details with formula
My question is

Wind speed 3.5 M/s Gen RPM
is 1500 ( 25 K/w Production )

Wind speed 12 M/s Gen RPM
is 1500 ( 220 K/w Production )

Why in 3.5 m/s generation was low , why in 12 m/s
generation was high ,
Pls dont explain wind force or wind density , that one
already i know

For the above question RPM was same why the KW was
different

Answer : 1. Its depends on the density ( Force ) of the air

Sir ,
Pls explain wit Formula sir


Answer

The gen speed has to be the same to maintain the
frequency.At higher wind speed wind-mill receives more power
from wind and hence the higher output.

Is This Answer Correct ?    1 Yes 2 No


Question { 5560 }

what is the use of providing earthing for tanks? i know for
lightning we use earthing ? Here one of my ONGC project
there is no need of lightning protection and there is no
power connection near by tank in that situation also ONGC
asking earthing for tanks but we didn't understanding why
they asking earthing? is anybody tell exact answer?


Answer

To remove static electricity

Is This Answer Correct ?    5 Yes 0 No

Question { Enercon, 8169 }

What will be happend if we not ground CT secondary?


Answer

One terminal of secondary of CT is earthed to remove the
influence of high voltage of primary on secondary due to
inherent capacitance between them .

Is This Answer Correct ?    3 Yes 1 No

Question { 5852 }

what is the basic differnce between ground and earth


Answer

Earth means always earth , ground may be earth or large conducting body as in vehicles,ships ..

Is This Answer Correct ?    0 Yes 0 No

Question { Suzlon, 3856 }

what is the formula to calculate the distance between one
phase to another phase in single phase line and 3 phase
line for different volt for example ; 33kv, 11kv ,22kv,230v


Answer

Do not calculate , just follow the I E Rules

Is This Answer Correct ?    0 Yes 0 No

Question { 5778 }

why two contacts(in series) are using in closing circuit


Answer

You mean 2 contacts are made in series in a MCB? That is to
make doubly sure of opening the circuit.If parallel ,it is
to make closing doubly sure ,as you can expect one of the
contacts to open or close definitely .

Is This Answer Correct ?    0 Yes 0 No

Question { Qatar Gas, 9122 }

why it is mentioned as 8/10 mva transformer why not directly
8mva or 10mva transformer. please explain me the full
detailed reason.


Answer

Depending upon type of cooling employed- with better cooling
10 MVA

Is This Answer Correct ?    5 Yes 0 No

Question { 5595 }

How to find earthfault location in long cable layed
underground or outside.


Answer

There is an equipment to locate fault ,or you have to resort to loop test

Is This Answer Correct ?    2 Yes 1 No

Question { 2874 }

In single core cable, Why non-magnetic material is used??


Answer

In case of twin core the return current is in opposite direction resulting in zero magnetism

Is This Answer Correct ?    0 Yes 0 No

Question { 16027 }

in 11kv/400v transformer when only one phase of 11kv supply
fails what happens to sec voltage and why


Answer

If delta/star ,one phase voltage will be normal and the
other two 50%, If star/star two phases normal and the third
missing

Is This Answer Correct ?    5 Yes 4 No

Question { Jindal, 6434 }

In a 3 phase induction motor(without connecting supply) if we
rotate its rotor by hand and check resistance of stator
winding at motor terminal box its resistance varies why ??


Answer

Probably due to the voltage induced by residual magnetism of
the rotor

Is This Answer Correct ?    10 Yes 5 No

Question { 4610 }

How turns ratio test is done in three phase transformers?


Answer

Voltage ratio is equal to turns ratio

Is This Answer Correct ?    1 Yes 0 No

Question { Adani, 3708 }

why we r used DC megger insted of AC megger?


Answer

To test insulation , you build voltage across it continuously over a period ,which is possible with DC only

Is This Answer Correct ?    0 Yes 0 No

Question { 10697 }

what is CT saturate?and which effect on CT after its saturate?


Answer

That is magnetic saturation , there will not be increase in flux with the current . The secondary current remains constant after saturation .

Is This Answer Correct ?    1 Yes 0 No

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