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???

Why HT voltages are expressed in 11KV,22KV,33KV and so on? (ie in times of 11)

3 Answers   Bhel, Park Hotel,

What Maximam Gap Taibaar & Bush

0 Answers   Bajaj,

how to get more than 1000 ohms between 2 earth pits ?

2 Answers   HCL,

why there is a fault occurs, if a phase wire touches ground.. and the fault not occurs when we connect a bulb between phase and ground..??

1 Answers  

if field winding of synchronous generator are shorted on each other will it start or burn or run for short time like induction motor

1 Answers  

What will be the current rating of Main switch for 80 kVAR panel

1 Answers  

if you asked to choose a ckt breaker from MCB & MCCB for 32A which one will be best and why??

7 Answers  

How the FM200 Gas Supression System wil Work????

1 Answers   Emerson,

HOW COULD A SINGLE PHASE INDUCTION MOTOR ROTATE IN OPPOSITE DIRECTION???

3 Answers  

WHEN I AM CONNECTIN TWO ELCB IN PARALLEL.ONE ELCB TRIPPED...HOW IT HAPPEND??

5 Answers  

i am an maintenance engineer. one distribution board have 5 feeder. recently its ELR trips frequently, but it take some times after trip( 10min,20min..)but 3 feeder no load. two feeder only loaded. i checked one feeder IR value all values are above 50Mohm.but B phase to Earth is only 9Mohm.any problem about low value

0 Answers  

If i have 200 test cases and we have to execute but we don't have time to execute all testcases.within 1 hour we have to execute that testcases and prepare the test report.so how i have to resolve this problem? is there is any technique in the testing.

3 Answers   Stag Computers,