Earthing switch assembling unit and high-speed earthing switch

Abstract

The invention relates to an earthing switch assembling unit and a high-speed earthing switch. The high-speed earthing switch comprises a sulfur hexafluoride arc-control device which is arranged in a closed air chamber of a shell of the corresponding assembling unit in the using process. The sulfur hexafluoride arc-control device comprises a static end assembly and a dynamic end assembly. The static end assembly comprises a static end support, a static end conductor arranged on the static end support, and a static arc contact electrically connected to the static end conductor. The static end conductor is provided with a conducting rod connecting structure which is used for being fixedly and electrically connected with the adjacent ends of two corresponding conducting rods. The dynamic end assembly comprises a dynamic end support and a dynamic arc contact which is switched on with the static arc contact to enable a single phase to be connected to the ground. The dynamic arc contact and the static arc contact are both horizontally arranged in the left-right direction. The high-speed earthing switch further comprises a power output end and an operating mechanism which is in transmission connection with the dynamic arc contact. The high-speed earthing switch is used for extinguishing secondary arc currents, and the high-speed earthing switch is used in the earthing switch assembling unit.

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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