Answer / j.kesavan

Dar means dielectric absorption ratio test in HT
machines.HT megger reading 1minite/30second reading is Dar
test.

Answer / sam

DARThe is The ratio of a 60 s reading to a 30 s reading
this ratio of time-resistance readings can be used to
indicatethe condition of the insulation system.
DAR = Recsistance 60 sec / Resistance 30 sec
Goog Insulation DAR more than 1.25

Proviiding the Dedicated N earth and individual Body Earths ,Finally these all looped /Now my Question :- will it not harm in case of Transformer Fault current flows in Dediacted N Earthing to Looped Body Earthing.

0 Answers  

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1.what is difference between line,neutral and earth 2.IF single phase voltage is 230v ac and what should be the voltage between line to neutral,neutral to earth and earth to line

1 Answers  

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can we make a electric generator,which can not use any type of fuel,air,solar,gas,thermal,coal,petrol,etc and able to produce electrical energy (or self electricity generating generator)

0 Answers   NTPC,

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How to minimize the eddy current losses?

0 Answers  

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WHAT WILL BE THE SPEED OF MOTOR IF NO.OF POLES ON STATOR ARE NOT EQUAL TO NO. OF POLES ON ROTOR.???

4 Answers  

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which bridge is used to measure frequency?

2 Answers  

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what is the difference between a race around condition and toggling?

1 Answers  

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1.4 What is meant by CT knee point voltage and how would you determine it

0 Answers  

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Can i use to 3 phase 4 wire energy meter inplace of 3 phase 3 wire energy meter ?

4 Answers  

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Make a list observation on Transformer?

0 Answers   HSL,

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what happens when the supply frequency to the tube light is reduced to 25Hz....?

5 Answers  

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what is difference between 2 pole structure and 4 pole structure in transformer yard

0 Answers   Hospira,

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