Comprehensive lightning protection system of electric transmission lines of high tower of power grid

Abstract

The invention discloses a comprehensive lightning protection system of electric transmission lines of a high tower of a power grid. The comprehensive lightning protection system comprises a transformer substation, a grounded multi-stage surge-preventing device and the three-phase electric transmission lines connected with the power grid are led out of a three-phase port of the transformer outbound end of the transformer substation, each phase line of the three-phase electric transmission lines is connected with a voltage isolator in series, the electric transmission lines connected with the power grid and led out of the output ends of the voltage isolators are connected with the high tower, thunder and lightning arresters are arranged at the top of the high tower and connected with a maintainable ground grid embedded below the tower through the metal tower body, the overhead electric transmission lines are supported through all phase insulator strings connected to the tower in a suspended mode, two sides of the insulator string supporting each phase line are respectively provided with a nanometer magnet resistor, and lightning conductors are arranged at the top of the tower in a supported mode. By means of the technical measures, the multilevel, omni-directional and three-dimensional comprehensive lightning protection system which makes high tower protection as the center, attaches equal importance to thunder and lightning counterattack resistance and thunder and lightning shielding failure resistance and conducts omni-directional thunder and lightning protection on the electric transmission lines and the transformer substation is built, and the lightning trip-out rate can be reduced obviously.

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

Images