
Interruption in Air
A-6
72A-1898 Rev. A 11/01
Monday
, November 26, 2001 1:09 pm
Figure A.5 Air-Blast Circuit Breakers Operation (Continued)
Air-Blast Circuit
Breakers –
General
This technique is used in circuit breakers rated up to 36 kV; however, the
basic principle illustrated in Figure A.6 (under normal conditions current
carrying conductors are surrounded by compressed air) is used in circuit
breakers rated up to 765 kV.
5.
As the air blast continues, the energy
6.
The arc is extinguished at the end of 1/2 cycle.
7.
When the isolating contacts are open, the air valve
of the arc is absorbed by further cooling
and the dielectric strength is increased.
After a time delay, the isolating contacts open.
shuts off the air blast supply and the interrupting
contacts reset through spring pressure.
Содержание TDR9000
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