Method for generating calibration pulses for detecting partial discharges in high voltage equipment

Abstract

The invention relates to a method and a device for generating a partial discharge calibration pulse of high-voltage electric equipment, and belongs to the technical field of high-voltage equipment monitoring. Set the amplitude and repetition frequency of the calibration pulse through the external port. The amplitude of the set calibration pulse is read by the microcontroller and converted into the corresponding internal set value. According to the set value, the microcontroller controls the digital-to-analog converter to output a corresponding low-voltage DC analog signal, and amplifies it into a high-voltage DC analog signal through a precision amplifier. The microcontroller generates a control signal, drives a high-speed switch, outputs a high-voltage DC signal with a specific width, and then turns it off quickly, thereby generating a pulse for partial discharge calibration. The timing of the output pulse is controlled by the microcontroller according to the zero-crossing point of the reference signal. The method greatly improves the steepness of the calibration pulse and expands the output range of the pulse amplitude. It will play an important role in off-line measurement of partial discharge, live detection, on-line monitoring and fault diagnosis of high-voltage power equipment.

Description

technical field [0001] The method of the invention relates to a method for generating a calibration pulse for detecting partial discharge of high-voltage equipment, in particular to a method for generating a calibration pulse for partial discharge of high-voltage power equipment with a steep pulse front and a function of synchronizing with a reference voltage, belonging to high-voltage equipment Monitoring technical field. Background technique [0002] It is a common problem in high-voltage insulation that partial discharge occurs in some weak parts of the insulation of high-voltage power equipment under the action of high electric field. Under certain conditions, it will lead to insulation degradation and even breakdown. Timely detection of partial discharge in equipment and accurate quantification of partial discharge intensity will help to discover latent faults and avoid accidents. [0003] The pulse current method is widely used in partial discharge measurement. The up...

AI Technical Summary

Problems solved by technology

However, the current pulse calibration generator is difficult to meet the requirements, which often leads to a decrease in calibration accuracy or cannot be calibrated at all under strong interference

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