Discharge gap device for line lightning protection

Abstract

The invention relates to a discharge gap device for line lightning protection. The device comprises a discharge gap lower electrode plate, a fixed support insulator and a discharge gap upper electrodeplate. A power frequency current limiter is arranged on the discharge gap upper electrode plate. A discharge gap upper electrode is arranged on the discharge gap upper electrode plate, a discharge gap lower electrode is arranged on the discharge gap lower electrode plate, and a first discharge gap is formed between the discharge gap upper electrode and the discharge gap lower electrode; the discharge gap lower electrode plate is also provided with a group of detachable discharge gap auxiliary electrodes, and a second discharge gap is formed between the discharge gap auxiliary electrodes and the discharge gap upper electrode. The discharge gap device for line lightning protection can effectively solve the problems that a discharge gap structure of an existing power-frequency-free follow-current discharge gap device is provided with a single discharge gap, when energy generated by overvoltage is large, the gap is broken down and discharged, the energy of the overvoltage cannot be completely released, and redundant energy can still harm normal operation of a distribution line.

Description

technical field [0001] The invention relates to a discharge gap device for line lightning protection. Background technique [0002] When the distribution line (such as 35KV high-voltage distribution network and 110KV high-voltage distribution network) is overvoltage generated by lightning, it will cause flashover or breakdown of insulators and disconnection of wires. Lightning waves may even invade the substation along the distribution line, affecting the safe operation of the substation and even causing personal safety accidents. [0003] At present, in order to reduce the impact of overvoltage on distribution lines, discharge gap devices are generally installed on distribution lines. However, the current non-power-frequency freewheeling discharge gap device has the following disadvantages: the discharge gap structure of the non-power frequency freewheeling discharge gap device has a single discharge gap. When the energy generated by the overvoltage is large, the energy o...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a discharge gap device for line lightning protection, which can effectively solve the problem that the discharge gap structure of the existing non-power frequency continuous current discharge gap device has a single discharge gap, and when the energy generated by the overvoltage is large When the gap is broken down and discharged, the energy of the overvoltage cannot be completely released, and the excess energy will still endanger the normal operation of the distribution line. At the same time, because the design structure is not reasonable enough, there will be birds resident, due to the formation of flying birds The problem of risk of short circuit

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