Gas insulated switchgear

Abstract

Compact lightweight gas insulated switchgear which assures sufficient electrode fixing strength equivalent to the fixing strength given by brazing and is structurally simple and enables efficient arc rotation with low operating energy. In the switchgear, a movable arcing contact is located on a movable element, opposite to a fixed arcing contact and electrically connected to, or disconnected from, the fixed arcing contact as the movable element moves. The movable arcing contact includes, in order from its tip opposite to the fixed arcing contact, a first electrode as a convex hollow coaxial cylindrical electrode, hollow coaxial cylindrical first spacer, and second electrode as a hollow coaxial cylindrical electrode and has electric conduction means to connect the first and second electrodes electrically through the first spacer. The first and second electrodes are fixed through the first spacer by a fixing member having higher resistivity than the first and second electrodes.

Description

technical field [0001] The present invention relates to gas insulated switchgear (Gas Insulated Switchgear), in particular to a gas insulated switchgear suitable for having arc contactors that are in electrical contact with each other when closed, and arc-ignited when opened. Background technique [0002] In general, in gas insulated switchgear, arc contactors are arranged to prevent damage to the main contactor or shield for energization due to arc discharge generated at the time of opening, and the fixed side is arranged with a predetermined opposing distance. conductors and conductors on the movable side. Furthermore, there is known a structure in which an arc contactor is arranged on a fixed-side conductor, an arc contactor is arranged on a movable-side conductor, and an arc contactor is respectively arranged on a movable element, and furthermore, an arc contactor is arranged at the front end of the fixed-side or movable-side arc contactor. The elastic contact part is a...

AI Technical Summary

Problems solved by technology

[0014] For example, in the case of an arc drive method using a permanent magnet structure, it is necessary to consider the design of the permanent magnet's deterioration over time due to the temperature change due to the current flowing during operation, and the evaluation of the degree of deterioration of the permanent magnet is costly. Extremely laborious and time-consuming, and thus not in principle suitable for efficiently rotating the driven arc in the case of interrupting the alternating current, since the direction of rotation of the arc is reversed every half cycle

[0015] In addition, in the case of the arc driving method using the structure of the arc driving coil, it is necessary to arrange the arc driving coil near the arc generating part, so that no current flows in the arc driving coil in a stable operating state. structure, the structure of this part is complicated and the outer diameter becomes large, which hinders the miniaturization of the equipment

[0016] Furthermore, in the case of an arc driving method using a structure of a spiral electrode, since many minute slits (spiral grooves) are formed over the electrode surface, insulation for preventing arc commutation is required between the slits. structure, and since the helical electrode is arranged at the front end of the arc contactor opposite to the fixed side and the movable side, it is necessary to set a transfer mechanism such as a spring in the arc contactor during the breaking action so that the helical electrode Physically separated last, the structure of this part is complicated and the simplification of the manufacturing process is not suitable

Images