Serial multi-cavity arc-extinguishing lightning-protection device

Abstract

The invention discloses a serial multi-cavity arc-extinguishing lightning-protection device. The device comprises an installation fitting connected to the bottom of a protected circuit insulator and amulti-cavity arc-extinguishing lightning-protection body supported by the installation fitting, the top of the protected circuit insulator is provided with a punctured wire clamp electrode, and a serial main gap is arranged between the punctured wire clamp electrode and the multi-cavity arc-extinguishing lightning-protection body; and the two ends of the multi-cavity arc-extinguishing lightning-protection body are provided with end-portion fittings respectively, the multi-cavity arc-extinguishing lightning-protection body is internally provided with internal electrodes, a gas cavity is formedbetween every two adjacent internal electrodes, and the two internal electrodes positioned in the end portions are connected to the adjacent end-portion fittings respectively. Compared with the priorart, the serial multi-cavity arc-extinguishing lightning-protection device can be produced in a low-cost and batch manner; the device is characterized by simple manufacturing technology, low cost, high lightning protection performance, and stable operation and maintenance, and can be widely popularized; and after operation, the maintenance cost is extremely low, and basically, the device is freeof maintenance.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection devices, in particular to a series multi-chamber arc extinguishing and lightning protection device, which is used for the protection work of lightning overvoltage in a medium-voltage distribution network. Background technique [0002] When the thundercloud discharges to the ground, the rapid change of the electromagnetic field around the discharge channel will generate an induced overvoltage on the nearby overhead line. Thunderclouds may even directly hit distribution overhead lines, generating extremely high lightning overvoltages. When the lightning overvoltage exceeds a certain value, it will cause flashover or even disconnection of the distribution line, causing damage to the power supply network, which will directly affect the reliability of the power supply of the distribution system. Therefore, it is necessary to take protective measures against the lightning overvoltage of ...

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Problems solved by technology

Problems in the above protective measures: There is still a high probability of lightning shielding accidents in overhead ground wires, and the investment cost is huge; installing line-type metal oxide arresters is a very effective method, but its installation is complicated and the operation and maintenance costs are high ;The core starting point of installing the parallel protection gap is to improve the success rate of reclosing after a lightning fault. Technically, a certain lightning tripping rate is allowed, and there is a defect that the system will be temporarily powered off due to automatic reclosing.

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