Answer / thiru

transformer differential protection does not operate when
there is out zone fault.because that time two sides of CT's
sense same current. there is no difference of current.so
the relay does not operate.

Answer / v.selvakumar

through fault or external fault it won't operate.

Answer / zahid ali

Turn to turn fault it won't operate.
in other case if the neutral is grounded grounded through
high impedance or Resisted earth fault it wouldn't be
operate on ground fault.

Answer / zahid ali

because there is no difference in the current at the ends
of a winding with shorted turn: a turn fault would have to
burn through major insulation to ground or another phase
before it could be detected

Answer / minu

not the ground fault, if its settings are kept low enough,
it will operate for ground fault also. i am looking for
some other answer.

Answer / siddharth tayade

onely internal fault is detected by the diffrential relay
it will not trip under through fault condition

Answer / zahid ali

Ground Fault

Answer / minu

no. i am asking abt the in-zone faults only. for what in-
zone faults or some conditions will it not operate.

Answer / minu

hi zahid, thanks for the reply. can u pl elaborate a bit on
why it wont operate on turn to turn faults or for other
cases that u mentioned.

Answer / minu

does that mean that a shorted turn fualt wont be detected
by any other relay too???

What should be distance required in between two phase of HT cionductors in open area??????

3 Answers  

How to PLC give the command to electrical

1 Answers  

transformer test

4 Answers  

how can we calculate the current

3 Answers  

We have laid the single core Armoured cable 7 nos ( 2 each phase & 1 neutral ) to cater our electrical load . the issue is though we have Glanded the cable both the end also givan the earthing to the panel both the end we are facing a heavy sparking at the gland side. what could be the reason.

12 Answers  

What is majour reason of Electrical Arcing ?

9 Answers   ABB,

While miss missed name platform fo electric motor how to calculate simple fourmul,?

1 Answers   ABB, ABC,

what types battery chargers are there?wanted with details.

3 Answers   SCS,

Hi, what is 100 % stator earth fault protection and how it can be achieve by 3rd harmonics and low frequency injection principle ?

1 Answers  

sir, in a industry present pf is 0.54 pf 25hp power is there its want improve 0.9 pf. which suitable capacity capacitor is suitable please inform me.

2 Answers  

what is megar testing

4 Answers   NASA,

In CT,which terminal(s1,s2) need to be grounded?

2 Answers