Corona current measuring device and multi-point corona current positioning method using same

Abstract

The invention relates to a corona current positioning method and a corona current positioning device, and belongs to the technical field of power system operation monitoring and measurement. A biaxial magnetic field sensing measurement system is made based on high sensitivity, wide band, strong anti-jamming capability and other characteristics of a tunneling magnetoresistive magnetic field sensor and the sensitivity thereof to the magnetic field direction, measurement of a magnetic field around corona current in a bad electromagnetic environment is realized using a sensor array, a corona discharge point positioning method is put forward through measurement of the value of the magnetic field, and finally, approximate corona discharge point areas and approximate discharge points are obtained. According to the method and the device, a magnetic field signal generated by a high-frequency corona discharge current is measured based on the measurement advantage of the tunneling magnetoresistive magnetic field sensor, the characteristics of corona current are also taken into consideration, and accurate positioning of corona discharge points is realized. The problem that corona current produced due to equipment insulation defects cannot be positioned accurately is solved. The stability and accuracy of magnetic field and current measurement in an extreme electromagnetic environment are improved greatly. The operation stability and insulation level of the power grid are improved.

Description

technical field [0001] The invention relates to a multi-point corona current measuring device and a multi-point corona current positioning method using the same, belonging to the technical field of power system operation monitoring and measurement. Background technique [0002] A large amount of data shows that the main cause of failure of high-voltage power equipment is the deterioration and failure of insulation performance, so most of the failures of high-voltage power equipment are ultimately attributed to insulation failures. Partial discharge is the main cause of insulation degradation and an important sign of insulation degradation. As a main form of partial discharge, corona discharge is the main source of electromagnetic environmental problems including radio interference and audible noise, and has become one of the key technical issues of high-voltage power transmission. Therefore, the detection of partial discharge and corona discharge of equipment can effectivel...

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Problems solved by technology

Various physical phenomena such as sound, light, and electricity can be generated in the process of partial discharge. The measurement of partial discharge can be realized through the detection of different physical phenomena. The commonly used partial discharge measurement methods include ultraviolet imaging method, UHF method, pulse current Corona discharge is a form of partial discharge, the frequency of the discharge pulse is low, and the discharge intensity is weak. The ultraviolet imaging method and UHF method commonly used in partial discharge are limited by bandwidth and resolution. In addition, the electromagnetic environment of substations and equipment sites is extremely complex, and there are still large errors in the results of corona discharge monitoring / testing

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