in our 6.6kv motor feeder[it is having two sources from Bus A&B] earth fa

in our 6.6kv motor feeder[it is having two sources from
Bus A&B] earth fault relay is acting, we checked CBCT
connection and cable meggerd values found very good still
earth fault acting during first two are three start after
that it will hold. please clarify what was the reason. if
same motor is starting from other Bus-A it will start.

Question Posted / p.raghavendrarao

1 Answers
4635 Views
Gasal, Voltech, I also Faced
E-Mail Answers

in our 6.6kv motor feeder[it is having two sources from Bus A&B] earth fault relay is acting,..

Answer / a.p.nanjappa

WHAT IS THE TYPE OF 6.6KV SW.GR. hOW OLD IS THIS?
tHE EARTH FAULT RELAYS ARE VERY SENSITIVE. INSULATION
RESISTANCE OR MEGGER CAN NOT MEASURE.
CARRY OUT HV CAPACITANCE MEASUREMENT OF MOTOR,CABLE FEEDER.
AND hIGH POT TEST.
MEASURE THE TANGENT DELTA FROM DC HIGH POT.

IF MIN OIL CIRCUIT BREAKER,TEST THE OIL AND REPLACE.

WE ALSO EXPERIENCED THIS DUE TO BURNED CEREMIC/BAKELITE
PARTITION PLATES OF 6.6KV SW.GR

Is This Answer Correct ?

0 Yes

1 No

Post New Answer

More Electrical Engineering Interview Questions

Explain Power factor in simple words

1 Answers ETO,

i asked a funny question in Electrical ohms law V=IR in const temp voltage is directly proportional to current Power p=VI cos@ in that formula Voltage is indirectly proportional to current Try to give me the fact what is happening in Electrical.. contact Thanigai_1984@yahoo.co.in

3 Answers

what is the difference between E.L.C.B & R.C.C.B?

2 Answers

how we calculate the knee point of a protection and metering CT and what is the testing procedure.

1 Answers CS,

What is the use of insulation tester and how it is to be used.

2 Answers

What are the temperature elements?

0 Answers

WTA used cb?

0 Answers Tagros,

from which formula we select a capacitor rating?

4 Answers Suzlon,

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 ??

3 Answers Jindal,

1 hp single phase motor is more likely to get hot thsn inone hp 3 phase motor its true or false? If true why?

3 Answers Focus, Focus Energy,

if there are six generators (3 gas CATT, one Jenbacher o1 MW each, and two nos Diesel 01 no 01 mw other 0.65mw EDGs ( say), 3 CAtt gas set have identical pole pitch,01mw EDG and Jenbacher gas Set have different pole pitch, how their power connection can be done to connect a common bus bar during installation. in short, how different pole pitched generators power connection can be done to connect a common busbar system through generators incomer ACBs.

0 Answers

Unit of Magnetic Flux Density a) Tesla b) weber c) Hendry d) Farad

3 Answers Ecil,

For more Electrical Engineering Interview Questions Click Here