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.

3 ph motor connected in star delta starter. when we start the motor it run in star but when in is going in delta it trips the main incoming supply. why?

3 Answers   Bajaj Hindusthan,

principle of power export and import in captive power plant.Is it depends upon voltage,current or frequency?Plz explain briefly.

1 Answers  

DIFFERNCE BETWEEN DCS AND PLC? HOW IT WORKS?

0 Answers   Essar,

the max. power will be transferred if …… a) sending end vol. is high b) receiving end v is high c)…….. d) corona loss is least

2 Answers   Engineers India Limited,

Explain RYB?

21 Answers  

define excitaton voltage and excitation current?

2 Answers   Allied Group,

what is phase and neutral.

2 Answers   Birla,

comparision between ACB and VCB

1 Answers  

We know that primary transmission is done to reduce current so that i^2*r loss could be minimised but according to ohm's law v is directly proportional to i,which indirectly means higher potential difference means larger current?so how the current is minimised in high power transmission line??

2 Answers  

WHICH TYPE OF TRANSFORMER IS USED IN POWER TRANSMISSION BASED ON TRANSFORMER CONNECTION ON PRIMARY AND SECONDARY SIDE

3 Answers  

why effective resistance should be more than static resistance in transmission line?

0 Answers  

We have 800KW motor operating at 6600Volt,50 Hz supply.During 1st startup it tripped on overcurrent trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad was set on .94 initially.then we set at 0.97 and then it started fine.i dont understand why it tripped first?What are the protections which comes in picture during starting ?

6 Answers