Answer / pravin kumar

The minimum Insulation Resistance value for the power cables
2mega-ohm/kv this is both applicable for LT& HT side
for ex:
11 kv power cable need IR value is 22 mega-ohm

Answer / pgr ram

for HT cables (6.6 KV to 33KV) above 500 megohms is
required. For LT cables (1100 volts) minimum 100 meg ohms
is required

Answer / ibrahim

(cable voltage rating/1000+1M ohm)x10

Answer / deepak marya

IT IS ONE MEGA-OHM PER KVA AT 70 DEGREE CENTIGRADE.IR VALUE
IS HALF FOR TEN DEGREE CENTIGRADE RISE IN TEMP.

single phase for 230 then why three phase are 440 volt

4 Answers   ACIL,

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In a 3 phase 4-wire system. For a 3.5 core cable if all loads are single phase and balanced, what will be neutral current? will it be sum of all phase currents? Or it will be zero? And if loads are unbalanced what will be neutral current?

0 Answers  

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Is there a diode made that works with AC 120 volt 20 amp? If so can it completely stop all current flow in 1 direction at all times?

0 Answers  

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Wat is da difference b/w neutral earthing and unearthed system?

2 Answers  

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what is the right method of laying cable tray if we are using EOT crane in shed, better is below or up

1 Answers  

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why all selected supply voltages are multiple of 11.i.e440,11 kv,33 kv,66 kv,110 kv etc

6 Answers   Suzlon, TCS,

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why energy storing capacity of magnetic field is much higher than electric field ?

1 Answers  

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What is meant by a linear circuit and what is a non- linear circuit?

5 Answers  

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in transfomer which type of oil is use!

9 Answers   Essar,

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how caculate the pump head to maintain perticuler pressure of water and what would be the motor size in hp for the same?

1 Answers  

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We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

2 Answers   KPTCL,

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what is the function of short circuit maintenance ct and droop ct.

1 Answers   L&T,

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