Rotating contact structure of vacuum arc-extinguishing chamber suitable for capacitive load switching

Abstract

The invention discloses a rotating contact structure of a vacuum arc-extinguishing chamber suitable for capacitive load switching. The structure is composed of a moving conducting rod, a static conducting rod, a moving end cup seat, a moving end rotating contact and a static end contact. A spring is arranged in a moving contact groove of the moving end cup seat, and the moving end rotating contactis fixedly connected with the moving end cup seat through the spring. The moving end rotating contact is in sliding connection with the moving end cup seat through a contact point and a sliding groove. A lower surface of the moving end rotating contact is in surface contact with an upper surface of the static end contact. One-way valves are arranged at two ends of the sliding groove. In an operation process of the vacuum arc-extinguishing chamber, the moving end rotating contact always rotates; static fusion welding of the surface of the contact in a closing process can be avoided; and sliding friction between the lower surface of the moving end rotating contact and the upper surface of the static end contact is used to reduce insulation weaknesses of the contact surface so that a rebreakdown probability of capacitive load switching of the vacuum arc-extinguishing chamber can be effectively reduced. The structure can be used for a switching capacitive load, and is particularly suitable for the reactive compensation field of a power system.

Description

technical field [0001] The invention relates to the technical field of contact structure of a vacuum interrupter, in particular to a rotary contact structure of a vacuum interrupter suitable for capacitive load switching. Background technique [0002] Reactive power compensation plays an important role in maintaining safe, high-quality, and economical operation of the power grid. There are a large number of capacitive loads and inductive loads in the power system. These loads will generate a large amount of reactive power during the operation of the power system. The reactive power will increase the system loss and cause the voltage value at the load end to be lower than the rated value. Therefore, for Maintaining the voltage level of the power system, ensuring the quality of power supply, improving the transmission capacity, and reactive power compensation for the power system are indispensable. According to the statistics of power grid operation data, every 1kW of active ...

AI Technical Summary

Problems solved by technology

Due to the existence of insulation weakness on the contact surface of the vacuum interrupter after the inrush current is destroyed, the insulation performance of the vacuum interrupter will be significantly reduced. Therefore, when the capacitive current is interrupted and the recovery voltage is high, it is easy to cause heavy breakdown.

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