Earth switch assembly unit and high-speed earth switch thereof

Abstract

The invention relates to an earth switch assembly unit and a high-speed earth switch thereof. The high-speed earth switch comprises a sulfur hexafluoride arc extinguishing device arranged in an airtight air chamber of a casing of a corresponding assembly unit in use, wherein the sulfur hexafluoride arc extinguishing device comprises a static-end assembly unit and a moving-end assembly unit. The static-end assembly unit comprises a static arc contact and a static-end conductor electrically connected to a corresponding single-phase loop in use, wherein the static arc contact is fixedly and electrically connected onto the static-end conductor, a conductive support is fixedly and electrically connected onto the static-end conductor, and a central conductor connecting structure for being fixedly and electrically connected with a central conductor is arranged at one end of the conductive support, away from the static-end conductor. The moving-end assembly unit comprises a moving-end support and a moving arc contact for being closed up with the static arc contact to enable a single phase to be earthed. The high-speed earth switch further comprises a power output end and an operating mechanism in driving connection with the moving arc contact. The high-speed earth switch is used for extinguishing secondary arc current and used for the earth switch assembly unit.

Description

technical field [0001] The invention relates to a grounding switch assembly unit and a high-speed grounding switch in the field of power transmission equipment. 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 phase will continue...

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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