Shielded wire system for reducing shielding arc exposure of 750kv double-circuit lines on the same pole in mountainous areas

Abstract

The invention discloses a shielded line system for reducing shielding failure exposure arcs of 750kV common-tower double-circuit lines in mountainous areas. The shielded line system comprises a shielded line cross arm, a fixing device, and a shielded line. The shielded line cross arm is fixed to the outer side of a tower body section away from a mountain, and the tower body section is part of a 750kV common-tower double-circuit line tower. The shielded line is fixed on the shielded line cross arm. The tower body section, the shielded line cross arm and the shielded line are integrally disposed below an overhead ground wire, a phase-A conductor, a phase-B conductor and a phase-C conductor of a 750kV common-tower double-circuit line. The shielded line cross arm is longer than the cross arms of the phase-A conductor, the phase-B conductor and the phase-C conductor. For a 750kV transmission line of which the ground inclination angle is larger than 20 degrees in a mountainous area, a shielded line is mounted at the outer side of a tower under the conductors of the transmission line, so as to reduce the exposure arcs of the conductors to thunder and lightning, lower the probability of conductor shielding failure and improve the operation reliability of the transmission line.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation, and specifically relates to a shielding wire system for reducing shielding arc exposure of 750kV double-circuit lines on the same pole located in mountainous areas. Background technique [0002] For the traditional 750kV double-circuit line on the same pole located in the mountainous area, due to the increase of the inclination angle of the ground, the shielding performance of the ground to the conductor is weakened, which increases the exposure arc of the conductor to lightning, and the probability of the transmission conductor being struck by lightning increases rapidly. When the transmission wire is shielded, the voltage on the wire will rise very high, which will easily cause the flashover of the line insulator, resulting in a tripping accident of the line; in addition, the overvoltage generated by lightning will propagate along the line to the substation, causing the equip...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a shielding wire system for reducing the shielding arc exposure of 750kV double-circuit lines on the same pole in mountainous areas, so as to solve the problem of 750kV double-circuit lines on the same pole in mountainous areas. Due to the increase of the ground inclination angle, the transmission wires often suffer from lightning The problem of shielding; after the present invention is implemented, the shielding rate can be effectively reduced

Images