Method for determining space charge density distribution under excitation of acoustic pulses

Abstract

The invention relates to a method for determining space charge density distribution under the excitation of acoustic pulses. The method comprises the following steps: firstly performing mesh generation on the to-be-measured space to form cells, calculating electric field signals generated by space charge vibration in the cells, and finally determining electric field signals generated by the space charge vibration in the to-be-measured space under the modulation of continuous acoustic waves. According to the electric field signal decoupling algorithm, the numerical relationship of the electric field signals, the space charges and the acoustic pulses is adopted to replace a functional relationship of the electric field signals, the space charges and the acoustic pulses; on one hand, the problem is avoided, and on the other hand, the design of a three-dimensional space charge measurement system can be performed favorably in the later period.

Description

technical field [0001] The invention relates to the technical field of space charge measurement, in particular to a method for determining space charge density distribution under acoustic pulse excitation. Background technique [0002] With the rapid development of UHVDC transmission, the electromagnetic environment of UHVDC transmission and other related issues have attracted more and more attention. Corona discharge is an important part of the electromagnetic environment. The corona effect usually occurs on transmission lines under normal working voltage. Because the voltage polarity of the transmission line is fixed, the ions generated by the DC corona move in the direction away from the wire, filling the entire space of the transmission line to form an ion flow. The space electric field around the transmission line is the joint result of the nominal field strength generated by the transmission line and the ion flow field. [0003] The numerical calculation method of t...

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Problems solved by technology

Regarding the distribution of the electric field signal and space charge under the excitation of the acoustic pulse, Hazmi deduced the functional relationship between the electric field signal, the acoustic pulse and the space charge under the excitation of the acoustic pulse, but there are the following problems: (1) the line of defense for the propagation of the acoustic pulse The assumption is too idealized, and the sound field generated by the sound pulse excitation is difficult to distribute in the shape of an ideal cone; (2) For electrodes with inhomogeneous structures, the functional relationship between the electric field signal, the sound pulse and the space charge is no longer applicable; ( 3) In most cases, the function expression is difficult to describe the space charge distribution

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