Particle traps and parameter optimization methods for DC gas-insulated transmission lines

Abstract

The invention provides a direct-current gas insulation electric transmission line (GIL) particle trap. The particle trap comprises a trap base body, particle capturing grooves and insulating dielectric thin films, wherein the trap base body is arranged on the inner wall of the direct current GIL and is tightly laminated to the inner wall; the particle capturing grooves are continuously same wedge-shaped penetrating slotted holes and are formed in the tap base body, and are used for forming a low electric field region for capturing particles and inhibiting the escape of the particles; and the insulating dielectric thin films are positioned on the upper surface of the trap base body and at the bottoms of the particle capturing grooves respectively, and are used for inhibiting the electrification of the particles. According to the particle trap, aiming at the characteristic that metal particles inside the direct current GIL are high in motion activity, the wedge-shaped capturing grooves and the insulating dielectric thin films are arranged, and the motion and electrification of the particles can be inhibited respectively, so that the metal particles moving inside the direct current GIL are captured effectively, and the metal particles are avoided from generating insulating damage on the direct current GIL equipment. Moreover, the invention also provides a parameter optimization method of the direct-current gas insulation electric transmission line (GIL) particle trap in a targeted mode.

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 particle trap and parameter optimization method for DC gas-insulated transmission lines. Background technique [0002] in SF 6 or SF 6 / N 2 Due to its advantages of large transmission capacity, low loss, environmental friendliness and low maintenance cost, the DC insulated transmission line (GIL) with mixed gas as insulating gas is currently widely used in power transmission occasions with high drop, difficult land acquisition, and complex crossovers prospect. A certain amount of metal particles will inevitably be produced in the process of DC GIL manufacturing and equipment operation, 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 flash...

AI Technical Summary

Problems solved by technology

A certain amount of metal particles will inevitably be produced in the process of DC GIL manufacturing and equipment operation, 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 surface flashover of the insulator, thereby reducing the insulation performance of the equipment

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