Real-time measuring system for changes of an electric potential on the surface of an insulating material

Abstract

The invention relates to a real-time measuring system for changes of an electric potential on the surface of an insulating material. The system comprises a pedestal, a probe and electrode fixing support, a slide rail scale, a prober holder, a supporting column, a high-voltage electrode, a ground electrode, a capacitance probe, a probe protective cover, an insulating material fixing groove, a static voltmeter, a data acquisition system, a data process system, and a display interface. The probe and electrode fixing support is fixed above the pedestal through the supporting column. A slide guide rail is arranged on the fixing support. The high-voltage electrode, the probe protective cover and the probe holder are vertically arranged on the fixing support in sequence. The upper end of the capacitance probe is connected to the static voltmeter. The ground electrode is fixed to the pedestal. The insulating material fixing groove is arranged on the pedestal. The static voltmeter, the data acquisition module, the data process system and the display interface are connected in sequence. The system can measure on-line in real time electric potentials on the surfaces of different solid insulating materials and the same kind of solid insulating materials at DC voltages as well as in a power-off condition after surface modification.

Description

technical field [0001] The invention belongs to the field of testing the surface potential characteristics of solid insulating materials, and particularly relates to a real-time measuring system for surface potential changes of insulating materials. Background technique [0002] With the continuous improvement of the voltage level of my country's power system, high-voltage direct current transmission, as the most economical energy transmission method to achieve high-voltage, long-distance, and large-capacity transmission, has become the trend of my country's power grid development. However, the problem of surface charge accumulation of insulating materials under DC voltage has brought great difficulties to the development and application of insulating devices for high-voltage DC equipment. The study 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...

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.

Images