what is phase to phase fault? what is line to line fault?
Answer Posted / ashwin
There are basically 4 types of fault
Symmetrical fault is
1. 3phase fault and
Unsymmetrical faults are
2.Line to ground fault,
3.line to line fault and
4.line to line to ground fault.
Phase fault occurs when one of the line falls on any ground structure.
line to line fault occurs when any two lines of the 3 come in contact with each other without any physical contact with the ground...
Phase to phase fault occurs when any two lines of the 3 come in contact with the ground structure, in other words phase to phase fault is line to line to ground fault.
Correct me if I am wrong..
My email id is : tarus_cool@yahoo.co.in
| Is This Answer Correct ? | 15 Yes | 5 No |
Post New Answer View All Answers
What is the slip speed?
why lightning arrestor are made in two stack of insulator but why not cvt
What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer?
If I have 3 essential main switch board and 3 incoming electricity ,but only 1 genset running is that possible.
list of tests to be carried out at manufacturers end while purchasing a step up transformer of 11kv to 66kv ,2MVa Capacity.
What is given by the definition in BIL IMP/PF = 950/395 kV. This was found in a name plate of a power transformer.
is all the servo motors having brake?please specify which servo motors having brake for stop on position and which are not.
lamination figures
Name two low frequency oscillators?
what are the preventive maintanance actions taken for air circuit breaker? please answer me
If mutual flux is 1.2wb & power factor is 0.8 lag , then what is the Useful flux of a transformer?
What is the formula to calculate the no load current of a single & three phase induction motor
What is the difference between Encoder and Resolver?
We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
what kinds of Transformer oil grade is better for power transformer ?