Simulated modeling method for single-gap partial discharging of insulating medium

Abstract

The invention discloses a simulated modeling method for single-gap partial discharging of an insulating medium. The method comprises: (1), according to a partial discharging experiment characteristic and a physical process, an insulating medium model is selected; (2), on the basis of an attenuation law of a discharging charge in an air gap, discharging delay time in different polarity situations is calculated and discharging starting and stopping conditions are determined based on the time; (3), an inductive charge additional capacitor is introduced; (4), influences on a discharging characteristic by an air gap temperature and the intensity of pressure are introduced; and (5), according to the steps (1), (2), (3), and (4), a novel simulated model for single-gap partial discharging of an insulating medium is established and a simulation analysis is carried out on the model, wherein the inductive charge additional capacitor is included by the model. According to the invention, on the basis of the partial discharging generation mechanism of the insulating medium, the discharging characteristic, and the development rule, the simulation result and the experiment result match each other perfectly, so that the effectiveness of the simulated model is improved and the detection and diagnosis on partial discharging can be realized well.

Description

technical field [0001] The invention relates to the field of partial discharge simulation, in particular to a novel single air gap insulating medium partial discharge simulation modeling method. Background technique [0002] The phenomenon that only a local area of ​​the insulator discharges without penetrating the applied voltage conductor is called partial discharge. Statistics show that partial discharge is the main cause of switchgear insulation aging, and 85% of insulation faults are caused by partial discharge. Partial discharge detection has become the main means of insulation state detection of power equipment. On the basis of understanding the experimental characteristics and physical process, the effective simulation of partial discharge will help to understand its generation mechanism and discharge characteristics, so as to be used for the detection of partial discharge. [0003] Regarding the simulation of partial discharge, foreign scholars have used the three-...

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Problems solved by technology

This method no longer converts the insulating medium and air gap directly into lumped capacitance, but there are also problems that the influence of the insulating medium on the discharge process is ignored, and the control of the discharge start and stop strategy is still based on experimental experience.

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