Answer / sunil solanki

circuit breaker operating time & tripping time should be in
ms.also tripping time should be less than operating time.

Answer / barkha thakur

Circuit breaker operating time & tripping time should be
few cycles of the supply voltage

Answer / electrix

Cicuit Breaker Opening / Closing time are always in milli
secs. usually in 11 kv breakers it is around 60 - 80 ms for
closing and 40 - 60 ms for opening.

If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV?

3 Answers   L&T,

---

is it possible for different brand of H.V transformers to run or operate in parallel to each other? if so how much disturbance can this affact the H.V bus bar?

0 Answers   Unitech,

---

What is distance protection relay? where & why we use this relay?

2 Answers   Siemens, UltraTech, Voltech,

---

Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient?

3 Answers  

---

. The string effcy in AC sys is 80% Then for same power, the string effcy in dc sys is a) less than 80% b) 80% c) more than 80% d) zero

1 Answers   Engineers India Limited,

---

l&t switch FN 63 handle position can we change

0 Answers   OPTCL,

---

what is the Pickup/drop off ratio in BCPU relays

0 Answers   DNJ Energy LLC,

---

how synchronous condenser is used in place of synchronous generator with out negotiating IEEE standards? Can i use 3 generators as synchronous generators and 2 generators as a synchronous condensers in an IEEE 14 bus system with out disturbing the standards?

0 Answers  

---

What is SF6 Circuit Breaker?

10 Answers   Sodexo,

---

Why do you get a typical sound when the transformer is put into operation?

4 Answers   IIT,

---

in three phase with neutral connection, what will happen,if the neutral is in open condition with single phase distribution panel

4 Answers  

---

What is the working of Field winding in dc motor, in which part is it work or why ?

3 Answers  

---