we are operationing 3NOs 800 Kva generators by singronyus.specialey evening ti

we are operationing 3NOs 800 Kva generators by
singronyus.specialey evening time our panel trip. the panel
showing generator earth fault

Question Posted / eng.dev

4 Answers
7515 Views
RRB, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

we are operationing 3NOs 800 Kva generators by singronyus.specialey evening time our panel trip. t..

Answer / k.prakashchandra

Which relay ? SEFR or back -up EFR ? Are the gens connected
to grid ? Whether all the gens trip simultaneously ?
Whenever there is a momentary heavy earth fault in the
outgoing feeder,all the gens trip on back-up EFR with
instantaneous trip indication,though the line does not
trip.So ,it is advised to disable instantaneous fault trip
i.e. high-set of the back-up EFR.

Is This Answer Correct ?

2 Yes

0 No

we are operationing 3NOs 800 Kva generators by singronyus.specialey evening time our panel trip. t..

Answer / k.prakashchandra

Another probability. If there is any earth fault before the
GT primary bushings ,the gen may trip on SEFR if voltage
based( open delta) relay is used.Then you have to check
cable,termination glands and the stator winding for earth
fault either by meggering or better by applying rated voltage.

Is This Answer Correct ?

2 Yes

0 No

we are operationing 3NOs 800 Kva generators by singronyus.specialey evening time our panel trip. t..

Answer / biplab

check the stator insulation with megger of each gen........

Is This Answer Correct ?

1 Yes

1 No

we are operationing 3NOs 800 Kva generators by singronyus.specialey evening time our panel trip. t..

Answer / ronnie

this might be the result accumulation of moisture near the
earthing bit during evening time.which causes the generator
to trip showing earth fault....

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

what is the difference between RMS & TRUE RMS VOLTAGE

0 Answers IIT,

why some transmission lines have 7 wires n why some have 3 n 4??

3 Answers

What is the formula to find maximum load of a DG (Single phase and Three phase)?

1 Answers

can anybody tell me that for p.f. Improvment we use capacitor banks but how to decide its capacitance. As we all know how to calculate kvar but what abt capacitance value

0 Answers

May I know how much values to be set for earth fault, over current and short circuit values at 11kv side? I have 11kv van 1250amps rating. Present it's taking load 80amps?

0 Answers

Iam deepthi.i completed my b.tech from electrical engineering.i want to prepare for civil services.i dont have much knowledge about these exams,but i have great zeal of cracking exams.plz provide me suggestions to which options i can select for optionals

7 Answers

What happen if we re-start H.T motor whose rotor is running at 40% rated speed. Is it will damage motor winding?

1 Answers

why efficiency of generator is greater than motor?

2 Answers

How to determine stage of Automatic Power factor controlling Relay(Apfcr)?

0 Answers ABC,

i am getting to neutral earth voltage zero ,is this a perfect earthing ?

3 Answers

explain the transient reactance

1 Answers

Diagram on interconnectivity of 11kv transformer with RMU (i.e, one incoming and two outgoing or two incoming and one outgoing)

0 Answers

For more Electrical Engineering Interview Questions Click Here