Description and Functionalities
Pole operation
(principle of breaking)
P13--0001EN/02
4/6
01--2011
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relied on that it is complete or correct or will apply to any particular project. This will depend on the technical and commercial circumstances. It is
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GRID
Opening, continued
Operation, continued
The following table continues the opening phases:
Phase Description
”OPEN”
position
The arc goes off.
The molecules of SF
6
dissociated by the arc are
instantaneously reconstituted.
The residual gases from the break are adsorbed by the
molecular sieve, located at the base of the pole. Some
powdered products are deposited in the form of dust,
without impact on the circuit breaker.
Particular case
of small currents
In the case of weak currents(eg : operating unloaded lines, transformers,
or capacity banks), the arc’s thermal energy is too weak to cause enough
overpressure.
As a result, to obtain the arc blowing, the traditional auto--pneumatic effect
is mainly used; it develops in the volume (Vp), and blows in the volume(Vt)
until arc contact.
Vp
Vt
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