A grounding switch assembly unit and its high-speed grounding 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 during use, and the sulfur hexafluoride The arc extinguishing device includes a static end assembly and a moving end assembly. The static end assembly includes a static arc contact and a static end conductor used to electrically connect to the corresponding single-phase circuit during use. The static arc contact is fixed and electrically connected to the static end conductor. The static end conductor is fixedly electrically connected with a conductive bracket, and the end of the conductive bracket away from the static end conductor is provided with a center conductor connection structure for fixed electrical connection with the center conductor. The high-speed grounding switch also includes an operating mechanism in which the power output end is in transmission connection with the moving arc contact. 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 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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