What is meant by operating sequence of VCB : 0–0.3sec.–CO–
3min.-CO
- 2 Answers
- 22901 Views
- I also Faced
- E-Mail Answers
Answer Posted / srinivasan.
open-300 millisec-Close /open-3min-Closeopen - means the
circuit breaker is capable of performing the above
operations even at full shorcuit currents.
At the same time the circuit breaker should not be allowed
to operate lesser than these timings.For example open-20
millisec-Close open-1 min-close/open.
This type of breakers are called single shot autoreclose
breakers.
Immediately after a fault breaking,we can do close open the
circuit breaker.
This sequence is tested during type testing only.
| Is This Answer Correct ? | 16 Yes | 3 No |
Post New Answer View All Answers
Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?
Make a list observation on Transformer?
if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?
what is effect of leading power facter on the system and billing
Explain in details how you would react to an unexpected incident when your supervisor or manager is not around to give instructions?
Why air circuit breaker off due to power failure?
from which subjects most of the technical que will b asked for hpcl(electrical).pls help me
In an ACB shunt trip coil and undervoltage coil operated normally( breaker open and charged). But closing coil not operating untill manually discharge and recharging. Any help.
How to prepare electrical preventive maintenance plan & shedule of machine tools in manufacturing unit.
application s to shunt coil
For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?
what is meant by carrier aided trip protection in transmission line
how does commutator convert a.c to d.c?
What should be the amps for a MV fuses for transformer 630kVA 20(10)/0.4 kV
If we have use two power cable for incomer, that time how many use cbct for earth leakage protection? 1 or 2 if 1 way? If 2 way?
