Direct-current basin type insulator

Abstract

The present invention belongs to the power technology equipment manufacture technical field and relates to a direct-current basin type insulator. The environmental insulation property of an SF6 gas under a direct-current voltage are very different from the environmental insulation property of the SF6 gas under alternating current, and controlling charge accumulation and reducing surface charges during the long-term operation of an insulator have become key technologies and difficulties in the study of direct-current GIL (Gas-insulated transmission line) insulators. The direct-current basin type insulator provided by the invention comprises a central insert; the outer side of the central insert is provided with an epoxy aluminum oxide composite member; one end of the epoxy aluminum oxide composite member is connected with the central insert; the other end of the epoxy aluminum oxide composite member is connected with a flange; the central insert comprises a first intersection point; theflange comprises a second intersection point; and an included angle between a connection line between the first intersection point and the second intersection point and a horizontal plane is not larger than 20 degrees. Therefore, a normal electric field component can be greatly reduced under a premise that a horizontal electric field component is not increased, and therefore, surface charge accumulation can be suppressed, and the operational stability of the direct-current basin type insulator under direct current can be improved.

Description

technical field [0001] The application relates to the technical field of electric power technology equipment production and manufacturing, in particular to a DC pot insulator. Background technique [0002] Gas-insulated transmission lines (GIL for short) include DC GIL and AC GIL. Under DC voltage, the electric field in the gas gap of the GIL coaxial cylinder is constant, and the electric field distribution depends on the conductivity of the insulating material, and the conductivity of the insulating material is largely affected by many factors such as temperature, humidity, electric field strength and pressurization time. At the same time, during the operation process, factors such as polarity reversal and transient overvoltage interference under DC conditions greatly affect the stability of the GIL insulation system. In addition, under the action of a constant DC electric field, metal conductive particles are more likely to migrate and attach to the surface of the insulat...

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Problems solved by technology

[0005] The purpose of this application is to solve the problem that the insulation characteristics of SF6 gas environment under DC voltage are very different from those under AC. Controlling charge accumulation and reducing the surface charge during the long-term operation of the insulator have become the key technology and difficulty in the study of DC GIL insulators. The problem

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