Answer / vishreddy205

for the protection of breaker when
breaker doesn't operate for
abnormalities then main breaker act
as a backup protection

Answer / hardip dodiya

For Protection of Breaker and protection of EHV Bus-bar in
EHV and HV switchyard. all S/s breaker have one NO/NC
Contact connected to Bus-bar control panel in which. at
time of fault, Breaker Stuck up due to Mechanisam prob or
failure of Trip coil or any mechanical damage problem.
After it TIME-Delay time almost 200ms. busbar control
panels sense this abnormality and give command to all
breaker to trip which is connceted to EHV Bus-bar.

Protect the S/s Equipment.

Answer / shailesh

The main function of LBB to get protection (To trip breaker)
when main breaker not trip due any reasons.

.if the vector group of two transformers is not same n tey r connected in parallel operation then what will happen?

2 Answers   ABB,

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Differenciate between circuit wiring and sub main wiring with illustrations

0 Answers   MU,

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What should be the earth pit resistance value?

7 Answers   BARC,

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We have 3 Gensets 1.500kva,2.380kva,3.250kva How can we connect in common busbar&we have variable load.

4 Answers  

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In transmission line the line power loss only accured at resistance the inductance and capacitance wont consume power is it correct?

2 Answers  

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how the arcing is made in ac electric arc furnace? ( between the three electrodes in any sequences or between the electrode & the charge(steel))

1 Answers  

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As Electricity Generates in MW I w'd like to know What are the factors we have to consider regarding the transmission of electricity from generation station to Public uses(230 V)

1 Answers  

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how many by pass system in online UPS.

4 Answers  

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Please explain me about Relay curves and their sources to read ?

0 Answers  

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In Energy meter How many rotation Equal to one unit.

3 Answers  

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for ac networks if the voltage wave form is V=Vm sinwt here the voltage Vm=230 for the frequency 50hz then the time period is 0.02 sec then for the time period 0.12 sec what is the voltage

4 Answers  

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Why CT secondary is grounded?

4 Answers  

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