| 摘要 |
An electric switch includes a first arcing contact surrounded by a puffer break chamber in which the gas is pressurized by the thermal effect, and a second arcing contact movable along an axial direction relative to the first arcing contact. The break chamber includes an inner partition separating a first compartment of fixed volume from a second compartment of smaller volume, both compartments being filled with the gas under pressure and each possessing an orifice to blast the arc, the orifices being separate and placed in series along the axial direction. Each compartment is connected to its own orifice via a respective blast channel. The compartments communicate with each other via a channel that is closed by an excess pressure vent device allowing gas at excess pressure to pass in one direction only from the smaller volume compartment to the larger volume compartment.
|
