Description and Functionalities
Pole operation
(principle of breaking)
P13--0001EN/02
3/6
01--2011
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GRID
Opening, continued
Operation
The following table gives the opening phases:
Phase Description
Start
of opening
When the mobile contact (4) leaves the main contacts (3),
the current is switched on the arc contacts (10). The
volume compression (Vp) creates an initial increase in
pressure.
Vp
43
10
Thermal
effect
On separation of the contacts (10), the arc appears and its
energy causes a pressure increase in the volume of
thermal expansion (Vt) colsed by the contact rod (11) and
the insulating nozzle (12).
12
11 10 Vt
Cuts
and
assistance
on opening.
When the rod (11) leaves the nozzle (12), the thermal
overpressure in the volume (Vt) is freed, which causes
energetic blowing, just before the zero--crossing of the
current, ensuring the final extinction of the arc. The
overpressure of the volume (VP) escapes via the valve
(13).
11 12
Vp
Vt
13
Continued on next page.
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