Intelligent combined protection assembly with external series trigger type overvoltage protection gap

Abstract

An intelligent combined protection assembly with an external series trigger type overvoltage protection gap is formed by connecting the trigger type overvoltage protection gap and a voltage limiting type zinc oxide lightning arrester in series. The trigger type overvoltage protection gap adopts a triggering mode of discharging on the surface of an annular insulating medium material, and the trigger type overvoltage protection gap can be automatically coupled with the energy of overvoltage, so that under the condition that the AC / DC normal withstand voltage is not reduced, the lightning impulse breakdown voltage of the intelligent combined protection assembly with the external serial trigger type overvoltage protection gap can be reduced, and the response time to overvoltage is shortened; and the voltage limiting type zinc oxide lightning arrester unit is formed by connecting a group of zinc oxide nonlinear resistor discs in series, and is fixedly arranged in an insulating umbrella skirt jacket through insulating filling glue. Due to the isolation effect of the external series trigger type overvoltage protection gap, the direct current reference voltage and the impact residual voltage of the zinc oxide lightning arrester unit in the external series gap lightning arrester can be obviously reduced.

Description

technical field [0001] The invention relates to a high-performance surge arrester for out-of-band series overvoltage protection gaps in the fields of electric power, high-speed information railway power transmission, etc., in particular to a combined protection component for out-of-band series trigger type overvoltage protection gaps. Background technique [0002] The arrester of the outer string gap is an important new overvoltage protection device for AC and DC power transmission and high-speed information railway systems. Most of the discharge gaps of the outer string gap arresters at home and abroad work in the atmospheric environment. The disadvantage of the discharge gap in the atmospheric environment is The impact breakdown voltage is high, the dispersion is large, and it is easily affected by the environment, especially when the air humidity is high or in rainy weather. During actual operation, it often occurs that the lightning strike does not work, causing breakdow...

AI Technical Summary

Problems solved by technology

At present, the surge arresters with external series gaps cannot meet the above requirements of the external series gap arresters, and their performance indicators still need to be improved.

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