Composite flat sample three-dimensional space charge measurement device based on pulsed electro-acoustic method

Abstract

The invention discloses a composite flat sample three-dimensional space charge measurement device based on a pulsed electro-acoustic method. The composite flat sample three-dimensional space charge measurement device comprises an upper electrode and a lower electrode, wherein an aluminum electrode is arranged in the upper electrode, a dual-layer composite flat plate dielectric sample is arranged between the aluminum electrode and the lower electrode, a pin electrode and a pin electrode are arranged between layers of the dual-layer composite flat plate dielectric sample, an absorption layer used for absorbing acoustic waves is arranged in the lower electrode, a piezoelectric sensor is arranged on the absorption layer, the piezoelectric sensor is connected with an amplifier, and the amplifier is connected with a computer by means of an A / D converter. The composite flat sample three-dimensional space charge measurement device successfully reproduces the accumulation, dissipation and migration characteristics of the space charges in a composite flat plate sample in an orthogonal nonuniform electric field, more realistically simulates the electric field environment of the sample under real working conditions, fully utilizes a greater number of piezoelectric films and makes all the piezoelectric films be closely attached to the lower surface of the lower electrode, breaks through thecurrent limitation that only one-dimensional space charge distribution in a uniform electric field can be measured, and improves the reliability of space charge measurement results.

Description

technical field [0001] The invention belongs to the technical field of space charge distribution measurement in a composite insulating material, and in particular relates to a three-dimensional space charge measurement device for a composite flat sample based on an electroacoustic pulse method. Background technique [0002] The electroacoustic pulse method is one of the widely used methods for measuring the space charge distribution at home and abroad. By injecting a high-voltage DC electric field and nanosecond pulses, the space charge behavior in insulating materials can be obtained through amplifiers and subsequent deconvolution calculations. At present, this method has been successfully used to measure the space charge of insulating materials under coaxial electrodes and flat electrodes. [0003] The prior art records a detachable electroacoustic pulse space charge measuring device, which is composed of a DC high voltage power supply, a nanosecond pulse generator, upper...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a three-dimensional space charge measurement device for a composite flat sample based on the electroacoustic pulse method, which can measure the composite flat sample under an orthogonal inhomogeneous electric field. The internal three-dimensional space charge transport process solves the problem that the prior art can only measure the one-dimensional space charge distribution under a uniform electric field

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