Arc extinction device and method for transmission and distribution line

Abstract

The invention discloses an arc extinction device and method for a transmission and distribution line and relates to the technical field of protection of a power system. According to the technical scheme, an arc extinction mechanism is arranged at one side of a fixed insulator string, the arc extinction mechanism comprises an arc extinguisher, starting rods, an upper yoke plate and a lower yoke plate, the upper part of the insulator string is connected with the arc extinguisher, the arc extinguisher is connected with one end of the upper starting rod, and the lower part of the insulator stringis connected with one end of the lower starting rod. The arc extinction device has the beneficial effects that compared with an existing lightning protection gap, the device has the advantages of being capable of quenching power-flow current and guaranteeing that a line does not trip. Compared with a zinc-oxide arrester, the arc extinction device has the advantages of being switched off rapidly, having long service life, and being capable of cutting large industrial frequency current. Compared with an existing air-jet arc extinction lightning protection gap technology, the device has the advantages of being capable of cutting power-flow current timely and reliably, being reusable and having long service life.

Description

technical field [0001] The invention relates to the technical field of power system protection, in particular to an arc extinguishing device and method for power transmission and distribution lines. Background technique [0002] The information society has continuously put forward new requirements for the reliability of power supply, and the lightning failure rate ranks first among all kinds of failure rates in the power system. When the line overvoltage caused by lightning strikes, the insulator string flashover develops into a stable power frequency arc, which will damage the insulator string and form a permanent fault; furthermore, it will cause the relay device to trip and the recloser to fail. [0003] The lightning protection gap is a device that guides the lightning current on the line to the ground through the breakdown gap, which can protect the line equipment from the harm of instantaneous overvoltage. However, the arc ignited in the gap sometimes cannot be exting...

AI Technical Summary

Problems solved by technology

Theoretical research and applied research show that although the existing lightning protection devices have a good effect on lightning protection, there are still deficiencies. For example, the arc extinguisher can only extinguish a small power frequency current. , the arc cannot be effectively extinguished, and the arc will always exist; the arc extinguishing reaction speed is slow, and the power frequency arc cannot be extinguished quickly; the gap distance is not easy to adjust, and the limited voltage of the lightning protection gap cannot be adjusted

These problems will affect the stable and safe operation of the power system, and bring hidden dangers to the power system, enterprises and people's production and life.

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