High voltage electrode device for pulsed electro-acoustic space charge measuring system

Abstract

The invention relates to a high voltage electrode device for a pulsed electro-acoustic space charge measuring system, and belongs to the technical field of pulsed electro-acoustic space charge measuring. According to the high voltage electrode device, an insulating support column and an upper metal high voltage electrode mast are fixed oppositely up and down, and are sealed inside a metal shielding shell through an insulating resin sealing piece. A lower metal high voltage electrode mast is arranged on the lower portion of the upper metal high voltage electrode mast. The upper end of a connecting ring of an insulating body is inserted inside a cavity of the upper metal high voltage electrode mast, and the lower end of the connecting ring of the insulating body penetrates an insulating pad ring and then is inserted inside a cavity of the lower metal high voltage electrode mast. An earthing electrode plate is arranged below the metal shielding shell, and a to-be-tested sample is arranged inside the metal shielding shell. The high voltage electrode device can adjust the resistance value of resistors inside the connecting ring of the insulating body according to the thickness of the to-be-tested sample, achieves wave impedance matching, improves the measuring accuracy of the pulsed electro-acoustic space charge measuring system, can be suitable for measuring of testing samples with different thicknesses, and is used for studying the influence of metal surface electron emission on generation and accumulation of space charges.

Description

technical field [0001] The invention relates to a high-voltage electrode device used in an electroacoustic pulse method space charge measurement system, and belongs to the technical field of electroacoustic pulse method space charge measurement. Background technique [0002] Space charge measurement technology is the most widely used space charge measurement technology for solid dielectrics at home and abroad. It is mainly used to study the accumulation, distribution, migration and decay process of space charges in solid dielectrics. However, the high-voltage electrode in this measurement technology will gradually become uneven due to mechanical wear, breakdown discharge and other reasons during long-term use, resulting in electric field distortion and local field strength increase. On the one hand, the distribution of the electric field applied to the sample is no longer uniform, which does not meet the requirements of the pulse electroacoustic method and affects the accura...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a high-voltage electrode device used in the electroacoustic pulse method space charge measurement system, change the structure of the existing high-voltage electrode device, to easily replace the metal electrode column of the high-voltage electrode, and solve the problems caused by discharge and other reasons. The electrode surface is uneven, which brings about electric field distortion, local field strength increase, and system performance degradation, which improves the accuracy and practicability of the high-voltage electrode device

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