GE GL317D Instruction Manual page 27

Opening, continued
Return of the resistor
insertion device
Molecular sieve
Special case
of small currents
03- 2017
Description and operation
Pole operation
(Interrupting principle)
The resistor insertion device (5) is restored to its initial position - actuated by
a spring (20) and the end of "X" volume depression - only after interruption.
5
The arc has been extinguished.
The SF molecules, separated by the arc, are re- formed instantaneously.
6
Residual gases left over from the interruption operation are adsorbed by the
molecular sieve situated at the base of the pole. A few powdery compounds
are deposited in the form of dust which is quite harmless for the circuit
breaker.
For small currents (example : operating no- load lines, transformers or capa-
citor banks), the thermal energy of the arc is too low to provide enough excess
pressure.
Consequently, the conventional autopneumatic effect developing in the
volume (Vp) is used mainly, to blast the arc.
GE Information
X 20
Vp
L13- 011EN/03
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