why CB should be oprate in Transient state why not in sub or steady state

Hello Guest,

It appears from your Topic Post above, that English is not your first language.

Please reply, and try and explain your Questions better, so that readers of your Topic can understand what you are asking.

Then hopefully you may receive a proper answer.

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Kind Regards....

sorry sir,

i m trying once again.

CB have three state 1.SUB TRANSIENT 2. TRANSIENT 3.STEADY STATE

I have read book in that written that cb must open at TRANSIENT STATE ......

HERE IS MY QUESTION IS why must be in Transient state ..........where as before it. that Sub transient wave comes where it have HIGH current at decrease rapidly.

where as in Transient state current is less as compered to sub transient......

hope u can understand my English at this time ............ reply...

Dear all,

If you wait for the current decreasing, the facilities around fault point will be damaged until the fault is cleared.

This is why, when a fault occurred it is better to clear the fault as soon as possible even it is still in transient stage.

Regards

than u sir for answer but i m not clearly undrsatand as u said wait for current decreasing but dear sir if we have to as early as possible why should not in SUB TRANSIENT WAVE...????

I'm afraid more information is needed.

What is the current rating of the circuit breaker? (>250 Amps may be significant)

For what voltage is the circuit breaker designed? (LV or HV?)

What kind of loads are intended to be connected to the circuit breaker?

Is the circuit breaker "electronic" or thermal magnetic?