Why to use the VCB at high transmission system? Why we can not use ACB?

Due to the integrity of Vacuum Bottles compared to ACB. Plus the VCB are way less maintenance demanding compared to ACB which demand more frequent maintenance on them. Number of operations which VCB can withstand are much more. No arc chutes issue and many more advantages. The contacts are enclosed in the bottles. So no dirt or any other issue.

Actually the thing is vacuum has high arc queching property compare than air .becoz in VCB ,the die electric strength is equal to 8 times of air . That y always vaccum used as in HT breaker and air used as in LT in these breakers employ with high resistance intruption principle.

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The main difference between the incisors is the insulation material used in extinguishing the electrical spark type

During the separation of the points of contact of the main boycotted

Cutter discharged from the Air Vacuum Circuit Breaker

Put out the spark in this kind of the mechanism (Circuit breaker) based on the principle unloading contactors room (Contacts)

A very high degree of up to 1000000000/1 Taurer under atmospheric pressure

To prevent the occurrence of air ionization which helps to bow occurrence

But this kind

Air circuit breaker

Of incisors does not use special techniques in order to extinguish the spark

This is because few have the ability