Answer / dinesh lokhande

As such values mentioned above are not same for all
transformers. Because Insulation resistance consist of
summation of resistance value for composite dielectric. i.e
dielectric consist of paper, oil, metal part, wooden
barriers etc which can be considered as several
capacitances in series.
Point here is we have to find out polarisation index

PI = Megger value after 10 mins / Megger value after 1 min.

PI as a normal practice and also mentioned in some
technical papers should be more than 1.3

Considering PI we can judge measured Insulation resistance
values of insulation.

Answer / karan

the meggar value depend on insulation level,
but we can inicate in thumb rule,
& thumb rule is
minimum meggar(IR)value is per KV 5megaohmas

Answer / ravi

Which Value????

Answer / hasan mehdi

50 M Ohms

Answer / uday pratap singh

5 Mega ohm per kV.

Answer / venkatesh

minimum 200-250Mohms

Answer / naveen kumar mishra

mndnnv

If any HVDC line is going with positive & negative(the negative usually have return path of current with earthing electrode). Now the question is if this HVDC earthed electrode which is using as return path and earthed any nearby 400kv or 220kv AC substation equipments. which will be the impact of this on AC substation & its equipment, how severe may be this and what should be the minimum distance require between HVDC earthed electrode and AC substation equipments? It's really an high engineering level question...Dare to answer and increase your knowledge.

0 Answers   MEIL,

What is the use device of the grid.

1 Answers   Premier,

what is a starter ??

2 Answers   NPTC,

State nyquist stability criterion.

0 Answers  

WHAT IS START TO INDUCTION MOTER IN STAR TO DELTA OF >5HP ?

0 Answers  

What is mean by hormonics?

5 Answers  

what happens if you swap F1 and F2 connection in the exiter of the generator?

1 Answers  

What is the need of generator relay panel

0 Answers   Newell,

size of condotory fron voltage level

0 Answers  

In the transformer, in which form we see the losses of transfprmer ?

3 Answers  

in short circuit. test of a transformer 5 to 10% ofvrated voltage is used why??? if we use rated voltafe then what will be?

1 Answers  

While performing load test on DC SERIES MOTOR, does the voltage decrease slightly. Why?

2 Answers