Non-intrusive surface potential measuring device for surface flashover

Abstract

The invention discloses a non-intrusive surface potential measuring device for surface flashover. The device comprises a test cavity, a flashover initiation device, a surface potential measurement device and a signal acquisition and analysis device, the flashover initiation device and the surface potential measurement device are arranged in the test cavity and are respectively arranged at two sides of a sample to be tested, and the signal acquisition and analysis device is arranged outside the test cavity and is connected with the surface potential measurement device. According to the invention, flashover initiation and surface potential measurement are synchronously carried out under the condition of the controllable temperature, humidity and vacuum degree, the defect that traditional surface potential measurement can only work after flashover is finished is overcome, research on the surface charge accumulation characteristic in the pressurization stage before flashover and the surface charge dynamic characteristic in the flashover period can be achieved by analyzing the surface potential measurement result, and support is provided for evaluation of the dielectric flashover resistance in the future.

Description

technical field [0001] The invention relates to a technology in the field of surface flashover testing, in particular to a non-intervention surface potential measuring device for surface flashover. Background technique [0002] Surface flashover is an important accident that affects the safe operation of high-voltage electrical insulation equipment. The electric field distortion at the "three-junction point" of the insulator as an insulating support is likely to cause surface charge accumulation and eventually evolve into continuous surface flashover, endangering equipment and power grids. safe operation. The accumulation process of the surface charge at the "three bonding points" in the pre-flashover stage and the dynamic change of the surface charge during the flashover stage are very important for evaluating the flashover resistance of the material, so the pre-flashover stage and the flashover stage are required. Surface potential measurement, but there is no surface pot...

AI Technical Summary

Problems solved by technology

The accumulation process of the surface charge at the "three bonding points" in the pre-flashover stage and the dynamic change of the surface charge during the flashover stage are very important for evaluating the flashover resistance of the material, so the pre-flashover stage and the flashover stage are required. Surface potential measurement, but the prior art does not have a surface potential test device for measuring the flashover process

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