Analog measuring device and method for surface potential of insulator in GIL

Abstract

The invention discloses an analog measuring device and method for the surface potential of an insulator in a GIL. The analog measuring device comprises a closed cavity, the insulator, an electrostaticprobe and a high-voltage electrode guide rod. Air inlet and outlet are formed in the cavity wall surface of the closed cavity. A guide rail is installed in the closed cavity, and a first shielding cylinder and the insulator are arranged at one end of the guide rail. The insulator is rotatably disposed in the first shielding cylinder through a high-voltage electrode support rod. A second shieldingcylinder is arranged at the other end of the guide rail, and the second shielding cylinder is internally provided with the high-voltage electrode guide rod. The first shielding cylinder and the second shielding cylinder are both grounded. The electrostatic probe is movably disposed in the closed cavity, and the electrostatic probe can measure the surface potential of the insulator. The analog measuring device can complete the analog measurement of the surface potential of the insulator in the high-pressure closed cavity, and can simulate the working environment of the insulator of the GIL inreality, the measurement result is high in credibility, and theoretical guidance can be provided for actual production.

Description

technical field [0001] The invention belongs to the technical field of research on charging phenomena on the surface of insulating materials for electric equipment, and in particular relates to an analog measuring device and method for the surface potential of an insulator in a GIL. Background technique [0002] Gas-insulated metal-enclosed transmission lines (GIL) have the characteristics of large transmission capacity, low loss, high safety, and environmental friendliness. They can replace traditional overhead transmission lines and can be used for large-capacity and long-distance power transmission. Compared with AC GIL, the charge accumulated on the surface of the insulator under long-term operation of DC GIL is the main reason for the decrease of dielectric strength. Therefore, it is of great significance to accurately measure the charges accumulated on the surface of insulators for the design and optimization of DC GIL transmission systems. [0003] In order to obtain...

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Problems solved by technology

The GIL insulator in practical application is in a confined space with relatively high pressure. The simulation measurement needs to be carried out in a high-pressure closed environment to make the measurement results have high reliability. The existing test methods and devices cannot meet the measurement requirements. need

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