Answer Posted / 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.

If 22 KV HT line, Current transformer is 25/5 then how to calculate multiplying factor.

613

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A 3 phase transformer's (Y-Y) Y and B phase is (Y and B connection not broken) broken from neutral and R and Nutral connection is ok, what will be the relay tripping and why

1484

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what could be the RMS value and average value of a 4 phase sine wave?

1418

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what is the affect of earth's magnetic field on the frequency used in aircraft???

1543

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How to decide the size of the capacitor for a single phase induction motor say 2 HP ??

1646

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why they were using TRIAC instead relay in some controllers and what is the advantages.

1518

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What is the rating of circuit breaker needed for 300 KVA load in 33 KV supply line in a transformer of 33 KV / 415 Volt ?

1340

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what is a vector protection in transformer

1522

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How capacitor improves pf

1200

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what is size of 3phase 4wire cable to be used for 11 ton ductable A.C and how to calculate cable size for different load

3592

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1. Design a counter which counts 0, 4, 8, 2, 6, and repeats using: 1.a using JK flip flops 1.b using T flip flops 1.c using D flip flops

1506

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What is the armature mmf in a D.C machine?

794

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What happened when capacitor connect series in ac circuit?

968

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diff.between servo motor and ac motor

1561

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Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632

2247

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