System for automatically measuring charge distribution on surface of solid medium

Abstract

The invention belongs to the testing field of discharge characteristics of solid insulating materials, relating to a system for automatically measuring charge distribution on the surface of a solid medium. The system comprises a stainless steel sealed chamber body, a high-voltage electrode, a grounding electrode, an electrostatic meter, a vacuum pump and a computer system thereof, wherein the stainless steel sealed chamber body is provided with a one-dimensional worktable and a two-dimensional worktable; a sample under test is fixed on the two-dimensional worktable; a electrostatic capacitanceprobe is arranged on the one-dimensional worktable; the electrostatic capacitance probe and the one-dimensional worktable are arranged in an extended chamber body of the stainless steel sealed chamber body towards the sample under test on the two-dimensional worktable; one end of the sample under test is connected with the high-voltage electrode, while the other end thereof is connected with thegrounding electrode; the one-dimensional worktable and the two-dimensional worktable are connected to an electronic control displacement table control box by a control line; the electrostatic capacitance probe is connected with the electrostatic meter; and the electronic control displacement table control box and the electrostatic meter are accessed to the computer. In the invention, the system for automatically measuring charge distribution on the surface of the solid medium can measure two-dimensional distribution of charge density on the surface of insulating materials.

Description

technical field [0001] The invention belongs to the field of testing discharge characteristics of solid insulating materials, and relates to a testing system for surface charges of insulating materials. Background technique [0002] Solid insulating materials are widely used in power equipment, high-power pulse, high-power microwave and other fields, but the surface discharge phenomenon seriously affects the miniaturization of these equipment, which greatly increases the manufacturing cost and reduces the operation reliability. There are many problems in operation and maintenance. The surface discharge of solid insulating materials is closely related to its surface charge accumulation. According to the secondary electron emission avalanche theory, it is believed that the initial electrons emitted at the triple junction of the cathode (cathode-vacuum-insulator interface) will be released under the action of an external electric field. These electrons will collide with the su...

AI Technical Summary

Problems solved by technology

[0004] In view of the technical problem that the surface discharge phenomenon of solid insulating materials seriously affects the miniaturization of equipment in the prior art, and the surface charge distribution of solid insulating materials cannot be automatically measured, the present invention proposes the following technical solutions:

Images