Method for rapidly positioning local discharging source based on two UHF sensors

Abstract

The invention discloses a method for rapidly positioning a local discharging source based on two UHF sensors. According to the method for rapidly positioning the local discharging source based on the two UHF sensors, a portable local discharging UHF signal positioning device is adopted, the two UHF sensors are arranged and used for receiving UHF signals generated due to local discharging inside a high-voltage electrical device to be measured, filtrating, amplification and analog-digital conversion are conducted on the UHF signals, so that integral waveforms of the two paths of UHF signals are obtained, the times when the signals of the local discharging source reach the two UHF sensors are compared so that a signal time difference can be obtained, when the signal time difference is zero, it is indicated that the local discharging source is located on a split of a connection line between the two UHF sensors, three splits which are perpendicular to one another are determined in the three-dimensional space, and the local discharging source is located on the point of intersection of the three splits. The method is suitable for positioning internal local discharging sources of high-voltage electrical devices such as high-voltage switch cabinets, transformers, power cables and GIS devices.

Description

[0001] technical field [0002] The invention relates to a method for locating sources of partial discharge (PD for short) of high-voltage electrical equipment, and belongs to the technical field of operation, maintenance and repair of high-voltage electrical equipment. Background technique [0003] High-voltage electrical equipment often manifests as the gradual development and enhancement of partial discharge (referred to as partial discharge) before insulation breakdown occurs, and insulation failures often originate from insulation degradation caused by partial discharge. Partial discharge is an important symptom of insulation deterioration. The higher the degree of insulation deterioration, the stronger the partial discharge activity. At the same time, partial discharge is also an important cause of further insulation deterioration. Therefore, an effective method is needed to detect and locate the internal partial discharge of high-voltage electrical equipment to improv...

AI Technical Summary

Problems solved by technology

[0004] In order to locate the source of partial discharge inside live high-voltage electrical equipment, ultrasonic methods and combined acoustic-electric (ultrasonic-electric pulse) methods are generally used, but ultrasonic signals generated by partial discharge The attenuation is fast, and the sensitivity and positioning accuracy of the ultrasonic method are low; high-voltage switchgear, GIS (Gas Insulated Switchgear) and other equipment cannot be installed with high-frequency current sensors, which limits the application of the combined acoustic-electric method

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