
TDR9000
™
Circuit Breaker Test System User’s Guide
72A-1898 Rev. A 11/01
A-13
Monday
, November 26, 2001 1:09 pm
Self-Extinguishing
SF
6
Circuit Breakers
Figure A.12 shows the structure of a Self-Extinguishing SF
6
Circuit
Breaker. (Reprinted from Reference 2. Permission granted by Marcel
Dekker, Inc.)
Figure A.12 Self-Extinguishing SF
6
Circuit Breaker Operation
The interrupting chamber is divided into two main compartments; one is
the arc compartment. Both have the same gas pressure, about 5 atm,
while the circuit breaker is closed. When the circuit breaker is being
opened, the contacts separate and an arc is drawn between them. The
heat generated by the arc heats the gas in the arc compartment and
rapidly increases its pressure. The gas blasts from the arc compartment to
the other compartment. This rapid expansion cools the arc column and
extinguishes it at a current zero point. A third compartment (not shown)
is incorporated to augment the gas pressure while interrupting smaller
currents. Using this arrangement, the arcing time is independent of the
current magnitude; and the currents are interrupted at their natural zero.
Содержание TDR9000
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