High-speed grounding switch and its constituted grounding switch assembly unit

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-control device which is arranged in a sealed gas chamber of a shell of a corresponding assembly unit when used. The sulfur hexafluoride arc-control device comprises a static-end assembly device and a movable-end assembly device. The static-end assembly device comprises a static-end conductor and a static arcing contact electrically connected to the static-end conductor. The static-end conductor is provided with conductive rod connecting structures which are fixedly and electrically connected with the adjacent ends of two corresponding conductive rods respectively. The movable-end assembly device comprises a movable arcing contact, wherein a corresponding fault phase is earthed through closing between the movable arcing contact and the static arcing contact. The high-speed earthing switch further comprises a power output end and an operating mechanism which is in transmission connection with the movable arc contactor. The high-speed earthing switch is used for extinguishing a 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

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