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.

what is the procedure for three phase motor differential relay testing can it do with single phase test kit?

1 Answers   ABB,

---

Could Please Explain briefly. Why used stabilizing resistance series with High impedance bus differential protection relay.

0 Answers   NCC,

---

where we take earth in hill station

1 Answers  

---

How current is reduced in STAR connection?

6 Answers  

---

How to megger test 11 kV cable and the acceptance IR value

0 Answers   BVG, NFL, ONGC,

---

---

what is use of thermistor ?

2 Answers  

---

what is the pressure of vacuum circuit breaker

2 Answers  

---

WHAT IS MODULATION AND NEED FOR MODULATION ?

1 Answers  

---

1 KW = how many kva

4 Answers  

---

how can we select the type of wire.what factors we have to look on it , do we have some formula to calculate it. please guide me on it

0 Answers  

---

in three pin pluge there three pins one is phase and second is earth third is nutral why nutral high diameter compare with phase and earth

10 Answers   Radiant,

---

What is the difference between Generator Differential Relay and Transformer Differential Relay?

0 Answers  

---