Answer / ashish patil

Preclose means breaker in off condition it supervise the trip coil & trip ckt is healthy.
& Postclose means It supervise When breaker is ON.

Answer / k.prakashchandra

It will supervise the trip circuit before and after closing
the breaker

To measure insulation resistance of 11KV cable between core & armour, what should be the test voltage & duration?

4 Answers  

---

what will be efficient rating of ac motor to lift a 10 kg wt of stone to 10 meter height with input 220V AC 50 Hz frequency???

1 Answers  

---

Define the "All - Day Efficiency" of a Transformer

1 Answers   Transco,

---

can any one tell me the formula for calculating the power and unit consumpetion

9 Answers   Avalon,

---

A 11KV, 1200 A breaker combination fixed in a cubicle for HT motor.Is normally for 11 KV motor fuse is using? if Yes, What range fuse is required?

0 Answers  

---

Why the generating station rating is in KW though the rating of generators in KVA?

8 Answers   HAL,

---

What will happen if the field of synchronous generator is removed when it is in operation with no load?

3 Answers   HJ, UPPCL,

---

why tertiary winding is used in transformer with diagram?

0 Answers  

---

what is difference between sub-station and switch yard.

16 Answers   Bhel, Ravate,

---

can we amplify dc signals.how can it be done

4 Answers  

---

what are the names of oil used in transformer and its chemical name?

11 Answers   Bhel, CSEB,

---

What do you understand by avr?

0 Answers  

---