Dielectric material space charge testing device based on electro-acoustic pulse method

Abstract

The present invention relates to a dielectric material space charge testing device with environmental parameter and electrode pressure control based on an electro-acoustic pulse method, belonging to the technical field of solid dielectric space charge measurement. The testing device comprises a sealing cover, an intelligent control display unit, an upper electrode system, and a lower electrode system. Through adding the removable sealing cover outside a test electrode platform, a smart temperature and humidity control system is added, an SMD pressure sensor and an SMD electrode temperature sensor are installed, and the panel intelligent control display unit is integrated outside the cover and are used for displaying electrode pressure and electrode temperature and intelligently controlling and adjusting the temperature and humidity in the sealed cover. The testing device can accurately control the temperature and humidity in the testing device sealed cover, the space charge test under a high temperature can be realized, the consistency of tested sample compaction degree in each time of test can be ensured, and the testing device is especially suitable for the space charge testing of an oil paper insulating material which works in a high temperature and has strong moisture absorption and a loose structure.

Description

Technical field [0001] The invention relates to the technical field of space charge measurement of dielectric materials, in particular to a dielectric material space charge testing device based on the electroacoustic pulse method. Background technique [0002] Since the advent of the electro-acoustic pulse method (PEA) in the 1980s, a large number of studies on the space charge transport characteristics of dielectric materials (polymer materials, ceramic materials, oil-paper materials, etc.) based on PEA technology have been carried out at home and abroad. [0003] The principle of the electroacoustic pulse method is to use the interaction of high-voltage pulses and the charge layer in the insulating medium to generate acoustic pressure waves that are proportional to the charge in the material, and then convert these acoustic pressure waves into electrical signals through piezoelectric sensors and amplify them. Obtained and displayed by a digital oscilloscope, the space charge dens...

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Problems solved by technology

However, in the existing research on space charge based on PEA technology, the maximum temperature is only 60°C, and there is no report on space charge experiments at higher temperatures.

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