Answer / vivek

open and short circuit fault is commonly cheked by megger.
earth fault also checked by megger or multimetter.

Answer / gulshan goyal

MAINLY THERE ARE TWO TYPES OF FAULTS SHORT CIRCUIT AND OPEN
CIRCUIT FAULTS.IN SHORT CIRCUIT FAULTS WE STUDY ABOUT
SYMMETRICAL AND UNSYMMETRICAL FAULTS.THE THREE PHASE FAULT
WHICH IS RARE MOST SEVERE FAULT IS SYMMETRICAL FAULT.AND
LL.LG ,LLG ARE UNSYMMETRICAL FAULTS.By performing short
circuit MVA analysis for positive, negative and zero
sequences, symmetrical three phase
and unsymmetrical phase-to-ground, phase-to-phase and
double phase-to-ground fault currents can be resolved.

Answer / mahaboob

plz send correct answers

Answer / monalisa rout

unsymmetrical faults,symmetrical faults,ground-to-
ground,line to ground ,nline to line and megger is a unit
to measure it.

Answer / barkha jha

Above answer is very correct
i want to add some value
for short circuit protection we use fuse as primary
protection & overload load relay for backup protection
for earth fault- we check phase to ground insulation
resistance,in case of earth fault its value comes to zero
For open circuit - check the continuity of supply

Answer / ankit goel

in addition to above ans i would like to add that for earth faults core balance transformers can be used.

I am having a 42KW 3 phase electrical heating furnace, heating element is 80/20 nichrome material, my connections is made in such a way that 2 star connection compromising 2 coils per phase so totally 12 coils, shall if i use it unbalanced star condition (instead of 2 group of 3 phase or 1 group of 3 phase, connecting 4 phases of 5 phases) what will be the consequences and is it acceptable?

0 Answers  

what is the difference in MCB, MCCB, RCCB, ELCB, & MPCB (motor protection circuit bracker)

12 Answers   Afcons, Bhel, CIHSR, DCS, IOCL, L&T, Lupin, Siemens,

how we can do the insulation on secondary of ct explain and so that tan delta will within limit

0 Answers  

We are getting supply at33kvand it stepdown to 11kv.So Our requirement is 11kv voltage.why we draw 33kv from the grid instead of 11kv?

2 Answers   Birla,

why tertiary winding is used in transformer with diagram?

0 Answers  

Is it possible to implement Restricted Earth Fault protection for a transformer without neutral CT?

2 Answers  

explain the details about vaccum circut breaker and advantages?

4 Answers   CPCL, Unisol,

how i calculate the syncrones generator NGR resistance .if we have a 6mw generator line voltage of generator 11kv also line current 393.3 ampere.

0 Answers  

What is a roll of a adopter pannel in buscoupler pannel????

2 Answers  

why the neutral point of star connnection oscillates?

3 Answers   Avalon,

kindly arrange to send me RRB Bangalore previous question paper for JE/Electrical and JE/Signal I am going to write exam on 2010

2 Answers  

what is the difference between effective earthing and resistive earthing?

3 Answers   REL,