Large-current breaking device for isolation switch and isolation switch using same

Abstract

The invention relates a large-current breaking device for an isolation switch and the isolation switch using the same. The breaking device comprises a movable-side breaking device and a static-side breaking device, wherein the static-side breaking device comprises a circuit breaker, the circuit breaker comprises an arc distinguishing chamber and an operation handle, the operation handle is provided with a switching-off position and a switching-on position which are used for driving a movable contact and a static contact of the arc distinguishing chamber into a switching-off state and a switching-on state during rotation around a rotational axis of the operation handle, the movable-side breaking device comprises a shift rod fixedly arranged on a corresponding conductive rod, the length of the shift rod extends along a horizontal direction, and a shift structure is arranged on the shift rod and used for shifting the operation handle to be rotated into the switching-on position from the switching-off position before the movable contact and the static contact of the isolation switch are switched on during switching-on of the conductive rod and shifting the operation handle to be rotated into the switching-off position from the switching-on position before the movable contact and the static contact of the isolation switch are switched off during switching-off of the conductive rod. With the adoption of the breaking device provided by the invention, the isolation switch has the ability of breaking large current.

Description

technical field [0001] The invention relates to high-voltage electrical equipment, in particular to a breaking device for an isolating switch and a foldable isolating switch using the breaking device. Background technique [0002] As an outdoor high-voltage isolating switch with an air break, its main function is to provide electrical isolation for high-voltage electrical equipment under no-load conditions, so the isolating switch does not have the ability to break the rated current. This isolation can be used for daily operations or for high-voltage equipment. maintain. The foldable isolating switch includes the moving and static contacts of the isolating switch arranged at the front and rear and the foldable conductive rod arranged between the moving and static contacts of the isolating switch. The contact connection end of the contact, the conductive rod can realize the opening and closing between the dynamic and static contacts of the disconnector through horizontal fol...

AI Technical Summary

Problems solved by technology

The foldable isolating switch includes the moving and static contacts of the isolating switch arranged at the front and rear and the foldable conductive rod arranged between the moving and static contacts of the isolating switch. The contact connection end of the contact rod can realize the opening and closing between the dynamic and static contacts of the disconnector through horizontal folding action. With the development of series compensation technology, after the power system adopts series compensation device, the isolation switch The current that needs to be broken has reached 6300A, and its recovery voltage has reached 7000V. At this time, it is impossible to use the air break to break such a large current. Because the disconnector cannot eliminate the arc, the contact burns seriously and cannot be used for ultra-high voltage isolation. Switching between switch busbars cannot meet the requirements of extra-high voltage isolating switches in special occasions (such as bypass isolating switches)

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