Answer / sridhar nayak

by the help of tester the insulation of the cable canbe
measured. the simple technique is just raotate the handle
of the megger and place the test prod one on conductor and
other on the insulation it should not show less then 2mohms.

Answer / savarkarshriram

If cable is rated for 1.1KV the megger test( Insulation
resistance test) is done with use of 500V or 1000V.
The test probes are connected across each phase , neutral
and ground terminal so that it covers all combinations.

If it is HT cable then 2000V IR tester is used. with the
same method as explained above.
Thumb rule for minimum value is 1M ohm per KV of rated
volatge of equipment

( Mind you megger is name of company and not name of test
so engineers should use term insulation resistance rather
than megger)

Why we are testing cables with dc?

1 Answers  

---

what is the difference between switchgear and circuit breakers and is there any difference between outdoor and indoor switchgear and circuit breakers , and how would you differentiate between switch yard and substation and grid station . thanks

0 Answers   ABC,

---

what is a difference berween line voltage and phase voltage?

2 Answers  

---

what is the difference between megger and earth tester?

28 Answers   Ashok Leyland, IOCL, RRL,

---

Why the stator is rotated in ceiling fans not Rator?

3 Answers  

---

What will hapen if we run generator below 47.6hz frequency?

9 Answers   TATA,

---

what is high and low cut off voltage of BB and DG at SPS????????

0 Answers  

---

sir , what happen if we decrease ( approx 3 inch ) the lenth of shaft in 110KW Induction , three phase motor. actually a 110KW motor is couppled with star couplling to 120TR compressor. When we doing maintenance in compressor it is required to skid the motor backword and resulting dis- alightnment . so we want to change the tyre coupling in place of existing coupling. so it is required to cut off the rotor aprox 3 inch form driving side.

2 Answers  

---

can we connect both delta and star to the transformer secondary and for what reason?

5 Answers   Power Grid,

---

Dear all, kindly give me the details of leectrical design engineer course details/institute in hyderabad /any where in india.

1 Answers   Reliance,

---

what is Electrical BMS

3 Answers  

---

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

0 Answers   Gulf Spic,

---