Grounding loop moving/static contact device for load switch

Abstract

The invention discloses a grounding loop moving / static contact device for a load switch, belonging to the field of a high voltage switch gear. The invention provides a moving / static contact device which is characterized in that the capacity of arc resistance is strong, the electric field is uniform and two stations are designed in a direct-acting mode. The grounding loop moving / static contact device for a load switch comprises a static contact device, a conductive electrode, a moving contact device and a crank arm, wherein the moving contact device and the static contact device are arranged on the same axis; the moving contact device comprises an cylindrical intermediate electrode provided with contact blade slots at two ends, a sleeve and the conductive electrode, multiple contact blades are arranged in the contact blade slots, the conductive electrode is arranged in the cylinder of the intermediate electrode, the conductive electrode is communicated with the contact blade at the tail end of the intermediate electrode, the intermediate electrode is arranged in the sleeve, a guide slot is arranged on the outer surface of the sleeve, a boss is arranged at one end of the crank arm, the boss on the crack arm slides in the guide slot of the sleeve and drives the moving contact device to do a reciprocating motion along the axis.

Description

technical field [0001] The invention relates to a high-voltage switchgear, in particular to a dynamic and static contact device of a load switch grounding circuit with a double-station design. Background technique [0002] At present, the vast majority of ring network switchgears in my country use SF6 gas as the insulating medium, knife-type moving contacts, and arc-extinguishing shims to assist arc-extinguishing ring network switchgears. Generally, a three-position spring operating mechanism is used. The transmission shaft rotates to drive the flexible and fixed moving contact of the three phases and the crank arm to rotate. Between the static contact of the main circuit and the static contact of the grounding circuit, the knife-type moving contact in the isolation position rotates forward and reverse to realize opening , Closing and grounding three-position action. The knife gate structure is the load switch contact structure of the moving contact, and the phenomenon of arc...

AI Technical Summary

Problems solved by technology

The knife gate structure is the load switch contact structure of the moving contact. When the switch is closed and opened, the phenomenon of arc throwing will inevitably occur. This phenomenon will easily lead to relative breakdown.

The reason is that during the movement of the moving contacts, the electric field at both ends of the moving and static contacts becomes very uneven, and the arc generated is a concentrated arc with a large arc energy, and the material of the moving and static contacts is made of pure copper. Its melting point is low, and its arc resistance is not strong, resulting in low electrical life and poor closing ability.

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