Conduction current and space charge synchronization measurement device

Abstract

The invention discloses a conduction current and space charge synchronization measurement device. The device comprises an outer metal electrode used for shielding a surface current on a tested sample, a high voltage metal electrode used for applying a high voltage DC voltage and a high voltage pulse to the tested sample, an insulation barrier used for isolating a body current of the tested sample from the surface current, a center metal electrode used for simultaneously leading out a signal wire to transmit a conduction current signal, an insulation plate used for isolating the conduction current signal from a spatial charge signal to synchronously measure the conduction current signal and the charge signal, and a piezoelectric sensor used for utilizing the piezoelectric effect to converting a sound wave signal generated because of the action of the high voltage pulse exerted onto the spatial charge signal into a voltage signal to make the tested sample simultaneously extract the conduction current signal and the spatial charging signal at one same region. The device is advantaged in that effective isolation between the conduction current signal and the spatial charge signal can be realized, synchronous measurement on the conduction current signal and the spatial charge signal can be developed, and measurement reliability is improved.

Description

technical field [0001] The invention relates to the technical field of performance testing of solid dielectric materials, in particular to a synchronous measuring device for conductance current and space charge. Background technique [0002] At present, the electroacoustic pulse method space charge measurement technology has become one of the general techniques for studying the space charge characteristics of insulating materials at home and abroad. This technology can be applied to the study of the distribution characteristics of the internal space charge of materials under the condition of AC and DC electric fields, including the dynamic evolution process of injection, migration, accumulation and dissipation of space charge, and the analysis of the origin mechanism, migration law, and space charge of the internal charge of the material. The interaction rules and internal mechanism of the material's electrical conductivity, partial discharge, breakdown, aging and other insu...

AI Technical Summary

Problems solved by technology

[0004] However, the problems existing in the current conductance current-space charge joint measurement technology are: (1) asynchronous measurement; (2) the four-electrode structure makes the conductance current and space charge measurement areas different, and the equivalence of the two signals needs to be verified; (3) The precision of conductance current is low, and it can only achieve the magnitude of μA or nA; (4) There are operational safety problems in extracting the conductance current signal at the high-voltage end, and the conductance current is too large or too small to affect the measurement accuracy

Images