Earthing switch assembly unit and its high-speed earthing switch

Abstract

The invention relates to a grounding switch assembly unit and a high-speed grounding switch thereof. The high-speed grounding switch includes a sulfur hexafluoride arc extinguishing device for being placed in a closed air chamber of a housing of the corresponding assembly unit when in use, and the sulfur hexafluoride arc extinguishing device The device includes a static end assembly and a moving end assembly. The static end assembly includes a static end support, a static end conductor set on the static end support and a static arc contact electrically connected to the static end conductor. The connection structure of the conductive rod is fixed and electrically connected with the adjacent ends of the corresponding two conductive rods. The moving end assembly includes the moving end support and the moving arc contact that connects the single-phase to the ground by closing the static arc contact. The head, the moving arc contact and the static arc contact are arranged horizontally along the left and right directions, and the high-speed grounding switch also includes an operating mechanism that is connected to the moving arc contact at the power output end. The invention provides a high-speed grounding switch for extinguishing a submerged current and a grounding switch assembly unit using the grounding switch.

Description

technical field [0001] The invention relates to a grounding switch assembly unit in the field of power transmission equipment and a high-speed grounding switch formed thereof. Background technique [0002] More than 90% of the faults on ultra-high voltage transmission lines are single-phase ground faults, and about 80% of the single-phase ground faults are "instantaneous" faults. Most of the 220kV and above lines in my country use single-phase reclosing to eliminate single-phase ground faults. To improve the stability of the system and the reliability of power supply, the success of single-phase reclosing depends on whether the submerged arc at the fault point can be self-extinguished. When a single-phase ground fault occurs in the transmission line, the automatic reclosing device of the system will act immediately, the circuit breakers at both ends of the fault phase will be disconnected immediately, and the short-circuit current will be cut off. At this time, the sound phas...

AI Technical Summary

Problems solved by technology

In the construction of UHV demonstration lines in my country, the neutral point of the shunt reactor is connected to a small reactance. This method may form a resonant circuit with the impedance of the reactor due to the phase-to-phase and phase-to-ground capacitance. Preventive measures need to be taken, which increases the complexity of system protection. sex, and at the same time more investment

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