A high-speed grounding switch and the grounding switch assembly unit it constitutes

Abstract

The invention relates to a high-speed earthing switch and an earthing switch assembly unit with the high-speed earthing switch. The high-speed earthing switch comprises a sulfur-hexafluoride arc-quenching device which is placed in a closed gas chamber of a shell body of the corresponding assembly unit in use. The sulfur-hexafluoride arc-quenching extinguishing device comprises a static end assembly part and a dynamic end assembly part. The static end assembly part comprises a static end support, a static end conductor arranged on the static end support and a static arc touch electrically connected to the static end conductor, the static end conductor is provided with conducting rod connection structures for being fixedly electrically connected with the adjacent ends of two corresponding conducting rods, the static arc contact is vertically arranged, the dynamic end assembly part comprises a dynamic end support and a dynamic arc contact which is combined with the static arc contact in a switch-on mode to enable the corresponding failure phase to be earthed, and the high-speed earthing switch further comprises an operating mechanism, wherein a power output end is connected with the dynamic arc contact in a transmission mode. The high-speed earthing switch and an earthing switch assembly unit with the high-speed earthing switch are provided for quenching the secondary arc current.

Description

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

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

Images