A real-time measurement system for surface potential change of insulating materials

Abstract

The invention relates to a real-time measurement system for surface potential changes of insulating materials. The system includes base, probe and electrode fixing bracket, slide rail ruler, probe holder, support column, high voltage electrode, ground electrode, capacitance probe, probe protective cover, insulating material fixing groove, electrostatic voltmeter, data acquisition system, And a data processing system and a display interface. Among them, the fixed bracket of the probe and the electrode is fixed above the base through the support column, and the sliding guide rail is set on the fixed bracket. The ground electrode is fixed on the base, the insulating material fixing groove is opened on the base, and the electrostatic voltmeter, data acquisition module, data processing system and display interface are connected in sequence. The invention can realize on-line real-time measurement of surface potential of different solid insulating materials and similar solid insulating materials after surface modification under DC voltage and after power off.

Description

technical field [0001] The invention belongs to the field of testing the surface potential characteristics of solid insulating materials, in particular to a real-time measurement system for the change of the surface potential of insulating materials. Background technique [0002] As the voltage level of my country's power system continues to increase, HVDC transmission, as the most economical energy transmission method for high-voltage, long-distance, and large-capacity transmission, has become the development trend of my country's power grid. However, the problem of charge accumulation on the surface of insulating materials under DC voltage has brought great difficulties to the development and application of insulating devices for high-voltage DC equipment. Studies have found that when a DC voltage is applied to the surface of the insulating medium, there will be charge accumulation on the surface of the medium. This accumulation of charges will distort the original electri...

AI Technical Summary

Problems solved by technology

After applying a DC high voltage on the insulating surface for a period of time, the researchers disconnected the voltage and scanned the surface of insulators with different shapes through capacitance probes to know the potential distribution of the insulating surface at a certain moment. During the period of time when the measurement process ends, the impact of the migration of surface charges on the test conclusions; through the existing research data, it is also possible to conduct longitudinal comparative analysis on the surface potential distribution of insulating materials at different times. However, due to the same measurement point at different times The time interval constant is large, so it is often impossible to capture the continuous change of potential in local areas; through optical means, with the help of the Pockels effect, the charging measurement of the surface charge of transparent insulating materials can be realized, however, this method is only effective for transparent materials , most of the insulating materials used in power systems are non-transparent insulating media. Different surface properties of materials often have different effects on surface potential migration, and the final experimental conclusions will also be different.

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