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Alternating current-direct current space charge measuring system and method capable of improving pulsed electro-acoustic method

An electroacoustic pulse method and space charge technology, applied in the field of measurement, can solve the problems of high data acquisition rate, space charge characteristic limitation, short measurement time interval, etc., achieve good phase resolution, signal processing capability enhancement, and measurement time shortened effect

Inactive Publication Date: 2012-09-05
SOUTHWEST UNIVERSITY
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Problems solved by technology

[0002] The space charge of polymer materials under DC voltage has been studied a lot, but the space charge characteristics under AC voltage are limited. The main technical reasons are due to the amplitude of the change under AC voltage and the shorter time interval of measurement. resulting in the need for higher data acquisition rates

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  • Alternating current-direct current space charge measuring system and method capable of improving pulsed electro-acoustic method
  • Alternating current-direct current space charge measuring system and method capable of improving pulsed electro-acoustic method
  • Alternating current-direct current space charge measuring system and method capable of improving pulsed electro-acoustic method

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[0035] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0036] The basic principle of electroacoustic pulse method to measure space charge is as follows: figure 1 As shown in the figure, U dc is the polarization voltage; R is the current-limiting resistance; C is the isolation capacitor, and a high-voltage narrow pulse electric field e is applied to the ring with space charge ρ(z) ρ (t), the high-voltage pulsed electric field interacts with the interface electric field and space charge to generate transient electromechanical stress, which sends out a stress wave p(t), and the piezoelectric sensor with a transfer function h(z) receives the stress wave signal and senses the charge q (t) and converted into a voltage signal u...

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Abstract

The invention discloses an alternating current-direct current space charge measuring system capable of improving a pulsed electro-acoustic (PEA) method, comprising a pulse generator, an emitter-coupled logic integrated programming support environment (Eclipse) signal averaging controller, a high-voltage pulse generator, a PEA measuring unit, a signal generator and a processing host. The system disclosed by the invention adopts the pulse generator of 3kHz and an Eclipse high-speed data acquisition system to acquire real-time signals, so that the measuring time is obviously shortened, a good phase resolution ratio can be obtained under high-frequency voltage and low-frequency voltage and real-time measurement of space charge under the influence of alternating current-direct current voltage can be realized; and meantime, a space charge attenuation graph can more vividly reflect dynamic change of charge.

Description

technical field [0001] The invention relates to a system for realizing AC and DC space charge measurement by improving the electroacoustic pulse method, and also relates to a measurement method. Background technique [0002] The space charge of polymer materials under DC voltage has been studied a lot, but the space charge characteristics under AC voltage are limited. The main technical reasons are due to the amplitude of the change under AC voltage and the shorter time interval of measurement. This requires a higher data acquisition rate. In recent years, with the development of UHV AC-DC transmission technology, higher requirements have been placed on the insulation properties of insulating materials, and the relationship between charge injection / extraction due to polarity reversal and aging degradation of insulating materials is still unclear . Therefore, understanding the dynamics of space charge under alternating current is of great significance for understanding the ...

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Application Information

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IPC IPC(8): G01R29/24
Inventor 唐超周天春陈光辉徐志强李娇
Owner SOUTHWEST UNIVERSITY
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