a lightning arrester

Abstract

The invention discloses a lightning arrester. Due to the isolation effect of the series pseudo-spark gap formed by the upper hollow electrode, the middle electrode and the lower hollow electrode arranged at intervals along the axis, the zinc oxide resistance sheet bears a small continuous power frequency when the line is in normal operation. Voltage, when the resistor sheet deteriorates, it will not affect the normal operation of the line. When the line is struck by lightning, the pseudo spark gap will break down, the zinc oxide valve will be turned on, and the current will be introduced into the ground to limit the voltage at both ends of the insulator. And the normal work of the wires can effectively improve the stability of the power supply of the distribution network system under the lightning disaster. The present invention connects the pseudo-spark gap and the zinc oxide valve piece in series as a whole and built it in the sheath sheath. The closed pseudo-spark gap , the discharge voltage is stable, and the reliability is high. In addition, compared with the air gap, the pseudo-spark gap has stronger arc extinguishing ability, faster action, and stronger flow capacity; compared with the vacuum gap, the pseudo-spark gap has smaller ablation.

Description

Technical field [0001] The present invention relates to lightning protection equipment, specifically refers to a lightning arrester. Background [0002] Lightning overvoltage is one of the important causes of 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, so improving the lightning protection measures of transmission and distribution lines plays a vital role in the safe and stable operation of the power system. [0003] The lightning protection measures commonly used in transmission and distribution lines are: erecting lightning protection lines, lowering the grounding resistance of poles and towers, and arranging line lightning arresters. Erecting lightning protection lines can reduce lightning direct strike wires, b...

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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