A comprehensive lightning protection system for power grid tower transmission lines

Abstract

The invention discloses a comprehensive lightning protection system for high-tower power transmission lines in a power grid, which includes a substation, a three-phase port at the outbound end of a transformer in the substation, and a multi-stage anti-surge device that is grounded and a three-phase power transmission line sent to the power grid. Each phase line of the three-phase transmission line is connected in series with an overvoltage isolator, and the transmission network transmission line drawn from the output end of the overvoltage isolator is sent to the high tower, and a lightning receptor is installed on the top of the high tower. The metal tower body is connected to the maintainable ground grid buried under the tower, and the overhead transmission lines are supported by the insulator strings of each phase mounted on the tower, and a nano-reluctance is installed on the phase lines on both sides of the insulator strings supporting each phase line. There is a flow device, and a lightning protection line is erected on the top of the tower. Through these technical measures, a multi-level, all-round and three-dimensional comprehensive lightning protection system with high tower protection as the center, lightning protection counterattack and shielding equal emphasis, and comprehensive lightning protection for transmission lines and substations can be significantly reduced. trip rate.

Description

technical field [0001] The invention relates to a safety lightning protection system for a power grid, in particular to a comprehensive lightning protection system for high-tower power transmission lines in the power grid. Background technique [0002] Lightning is a discharge phenomenon of the earth's atmosphere. Usually, when the electric field strength between the negatively charged thundercloud and the earth exceeds the breakdown strength of the atmosphere, a pulse discharge between the thundercloud and the earth occurs, which is what people call thunder and lightning. During the thundercloud discharge process, the discharge current increases sharply. At the moment when the lightning reaches the ground, the lightning current reaches tens of thousands of amps, even hundreds of thousands of amps. The potential difference between the two ends of the lightning channel can reach hundreds of thousands of volts. Where the current goes, it will cause strong electromagnetic, the...

AI Technical Summary

Problems solved by technology

Therefore, most of the ground lightning can cause the power grid to trip due to lightning and cause the insulation wire to break

[0007] Due to the limitation of the insulator structure of the distribution network, measures such as adding insulator sheets, adding lightning arresters, and installing overhead ground wires cannot ensure that the insulation level of the line exceeds the ground lightning current

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