Metal particle trap for direct-current gas-insulated power transmission line

Abstract

The invention discloses a metal particle trap for a direct-current gas-insulated power transmission line. The metal particle trap is composed of a driving electrode and a metal particle trapping groove. A direct-current GIL aluminum alloy conductor and a pillar insulator for a direct current GIL are arranged inside a direct-current GIL aluminum alloy shell. The driving electrode is installed nearby the pillar insulator for the direct-current GIL on the direct-current GIL aluminum alloy conductor. The metal particle trapping groove is installed inside a direct-current GIL cavity, so that the inclined face of the driving electrode faces the bottom metal particle trapping groove. The metal particle trapping groove comprises three layers which are the inward-concave type metal shielding groove, an epoxy resin insulation pad and the high-viscidity hot melt adhesive coating in sequence from bottom to top. The metal particle trapping groove is used for capturing and limiting particles, the inward-concave type metal shielding groove in the bottommost layer generates a low electric field area, the epoxy resin insulation pad on the middle layer coats the whole bottom of the inward-concave type metal shielding groove, and the high-viscidity hot melt adhesive coating on the uppermost layer can control and trap particles moving at a high speed.

Description

technical field [0001] The invention belongs to the field of high-voltage transmission lines in electric power systems, and in particular relates to a metal particle catcher for DC gas-insulated transmission lines (GIL). Background technique [0002] in SF 6 or SF 6 / N 2 Due to the advantages of large transmission capacity, low loss, environmental friendliness and low maintenance cost, DC GIL with mixed gas as insulating gas has broad application prospects in power transmission occasions with high drop, difficult land acquisition, and complex crossing. A certain amount of metal particles will inevitably be produced during the manufacturing process of DC GIL and the operation of the equipment, and the metal particles will move in the equipment or attach to the surface of the electrode or insulator under the action of the electric field force, resulting in a gap between the conductor and the shell. Breakdown of the air gap or flashover of the insulator along the surface, th...

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Problems solved by technology

[0003] Due to the unipolar DC electric field inside the DC GIL, the moving metal particles run through the entire air gap and collide with the conductor, and have faster movement speed and frequency. Therefore, the DC GIL metal particle trap has to solve the following problems: Ordinary The metal particle trap is not easy to control the movement direction of DC GIL metal particles, it is difficult to capture fast-moving metal particles, and it is not easy to fully suppress the charging of the particles after capturing the particles to prevent the particles from escaping, the capture rate is not high, and there is an aging problem

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