Lightning arrester

Abstract

The invention discloses a lightning arrester. Due to the isolation effect of a series pseudo-spark gap formed by an upper hollow electrode, a middle electrode and a lower hollow electrode which are sequentially arranged at intervals along a shaft, when a line is in normal operation, a zinc oxide resistor disc bears a relatively small continuous power frequency voltage, and when the resistor disc is degraded, the normal operation of the line is not influenced; and when the line is struck by lightning, the pseudo-spark gap breaks down, a zinc oxide valve plate is switched on, a current is guided into the ground, the voltage at the two ends is limited, normal work of insulators and wires is ensured, and the power supply stability of a distribution network system under a lightning stroke disaster is effectively improved. According to the invention, the pseudo-spark gap and the zinc oxide valve plate are connected in series into a whole which is arranged in an umbrella skirt sheath, and the closed pseudo-spark gap is stable in discharge voltage and high in reliability; in addition, compared with an air gap, the pseudo-spark gap is stronger in arc extinguishing capability, quicker in action and stronger in through-current capability; and compared with a vacuum gap, the pseudo-spark gap is less ablated.

Description

technical field [0001] The invention relates to lightning protection equipment, in particular to a lightning arrester. Background technique [0002] Lightning overvoltage is one of the important reasons for power system failure, which seriously threatens the reliability of power supply and affects social production and residents' lives. In order to ensure reliable power supply, more and more overhead lines use insulated wires, but insulated wires are prone to disconnection accidents after being struck by lightning. Therefore, perfecting lightning protection measures for transmission and distribution lines is crucial to the safe and stable operation of power systems important role. [0003] Commonly used lightning protection measures for transmission and distribution lines include: erecting lightning protection lines, reducing grounding resistance of towers, and arranging line arresters, etc. Erection of lightning protection wires can reduce direct lightning strikes on cond...

AI Technical Summary

Problems solved by technology

The advantage of the arrester with series gap is that due to the isolation effect of the series gap, the arrester body does not bear the continuous power frequency voltage, and only under the high-amplitude lightning impulse overvoltage, the arrester body bears the overvoltage load after the series gap breaks down. The surge arrester with series gap can avoid the temporary overvoltage caused by the single-phase grounding of the system and the effect of arc grounding or resonant overvoltage on the resistor, but there are shortcomings such as unstable discharge and open air gaps that are easily affected by external environmental factors, making the line safe. There is a certain risk in running

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