Lightning-protection method and device for transmission line composite insulator

Abstract

The invention discloses a lightning-protection method and a voltage-sharing lightning-protection device for a transmission line composite insulator, the device comprises: a first subpart of the voltage-sharing lightning-protection device is installed at one side of the composite insulator, wherein the first subpart comprises a first electrode with a protruding end, and the first subpart has the voltage-sharing capacity; while a second subpart of the voltage-sharing lightning-protection device is installed at the other side of the composite insulator, wherein the second subpart comprises a second electrode with a spherical end, and the second subpart has the voltage-sharing capacity; wherein, the first electrode and the second electrode construct a parallel connection gap. The method and the device of the invention realize dual functions of voltage sharing and lightning-protection for the composite insulator, prevent the metal at the end of the composite insulator from being burned by electric arc and effectively prevent the composite material from burning and damaging.

Description

technical field [0001] The invention relates to lightning protection for transmission lines, and more specifically, to a lightning protection method and a voltage equalization and lightning protection device for composite insulators of transmission lines. Background technique [0002] Lightning strike and pollution flashover are the main fault forms of overhead transmission lines. The power-frequency freewheeling arc caused by the flashover damages the insulator and its fittings, which brings great difficulties to the operation and maintenance of the line, often causing huge economic losses and adverse social impacts. [0003] The existing lightning protection measures for overhead transmission lines include: erecting lightning protection lines, reducing the grounding resistance of towers, strengthening insulation, adding coupling ground wires, and installing line arresters, etc. Its core idea is to improve the lightning resistance level of the line as much as possible and ...

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Problems solved by technology

[0005] Luo Zhenhai et al., "Research on Lightning Protection Protection of Composite Insulator Parallel Gap for 110kV and 220kV Overhead Transmission Lines" developed an I-type gap device suitable for lightning protection of 110kV and 220kV composite insulators. The discharge ball of the high-voltage side electrode is separated from the ring, and the structure It is slightly complicated, and the rigidity of the whole device is also small, so it is not suitable for field operation. If the parallel gap protection device is installed on the tension composite insulator, due to the large force of the tension string, untie the insulator string to install the parallel gap protection device. It is more difficult, and it may also cause the problem of prolonged power outage

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