46.Power Delivery by John G. Webster (Editor)

By John G. Webster (Editor)

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Metallic end plates are attached to the insulating envelope. The vessel contains a set of electrodes brazed to electrode stems of which one is fixed to an end plate and the movable electrode stem is connected to the other end plate via a metal bellows. The metal bellows provides a hermetic seal and contacts stem motion. Therefore, the vacuum interrupter is sealed completely, and the pressure within it is maintained at 10Ϫ6 torr or less. Surrounding the contacts is a metal shield that protects the insulating envelope from the deposition of arc products (metal vapor).

The vessel contains a set of electrodes brazed to electrode stems of which one is fixed to an end plate and the movable electrode stem is connected to the other end plate via a metal bellows. The metal bellows provides a hermetic seal and contacts stem motion. Therefore, the vacuum interrupter is sealed completely, and the pressure within it is maintained at 10Ϫ6 torr or less. Surrounding the contacts is a metal shield that protects the insulating envelope from the deposition of arc products (metal vapor).

Subsequently, the breaker can withstand the high transient recovery voltage following the current interruption. , 72 kV) have two interrupters connected in series by a cross-bar per phase. The crossbar connects the movable electrode of each interrupter. The interrupters for all three phases are contained within a single tank. The three crossbars are connected to insulating linkages and to the mechanism. For higher voltage circuits, one tank with a single interrupter is used per phase because of the high-voltage insulation distances needed between the interrupters and the tank.

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