High-voltage fuse type DC lightning arrester

Abstract

The invention relates to a high-voltage fuse type DC lightning arrester, which comprises a single-column fuse type DC lightning arrester, wherein the single-column fuse type DC lightning arrester comprises a zinc oxide valve piece unit and a fuse, which are connected in series; and the zinc oxide valve piece unit and the fuse are packaged through an epoxy tube to form the single-column fuse type DC lightning arrester. A plurality of single-column fuse type DC lightning arresters are packaged in parallel to form a single lightning arrester; and a plurality of single lightning arresters are connected in parallel to form a lightning arrester group. The fuse type DC lightning arrester group of the invention adopts a multi-column multi-branch parallel operation scheme; the fuse of the faulty column can be automatically blown before the single-column fuse-type DC lightning arrester is broken down due to characteristic failure and the structure is not damaged; when being broken down due to failure, the single-column fuse type DC lightning arrester is automatically blown and isolated from the whole set of lightning arresters; the remaining DC lightning arrester group can continue to operate, thereby ensuring that the DC system is not shut and improving the reliability of the DC transmission system.

Description

technical field [0001] The invention relates to the technical field of high-voltage electrical appliances, and more specifically, relates to a high-voltage fuse-type DC arrester. Background technique [0002] Due to its advantages of large capacity, long distance and low loss, UHV DC transmission has been rapidly developed worldwide. In order to solve the problem of unbalanced distribution of energy and power loads, more than 20 direct current transmission projects have been completed and put into operation in my country. The overvoltage of DC transmission system will seriously threaten the stability of DC transmission and large power grid operation. The DC converter station is equipped with a large number of zinc oxide DC arrester groups to prevent overvoltage damage to DC transmission equipment. Reasonable arrester configuration can effectively protect the equipment in the converter station, improve the reliability of the system operation, reduce the investment cost of t...

AI Technical Summary

Problems solved by technology

If there is a post arrester in the whole group due to damp insulation or deterioration of the valve plate, the residual voltage of the post arrester will drop, the shunt will increase sharply, and the accumulated energy will far exceed its own heat capacity, resulting in breakdown short circuit and explosion, the whole group of arrester will fail, and the DC system will be forced to stop transport

Therefore, it is urgent to solve the problem that the failure of the entire group of arresters is caused by the failure of the single-column arrester.

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