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

A positioning method and sensor technology, applied in the direction of testing dielectric strength, etc., can solve the problems of fast ultrasonic signal attenuation, inability to install high-frequency current sensors, low sensitivity and positioning accuracy of ultrasonic methods, and achieve fast positioning speed and high reliability , The effect of high positioning accuracy

Active Publication Date: 2014-07-09
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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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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  • Method for rapidly positioning local discharging source based on two UHF sensors
  • Method for rapidly positioning local discharging source based on two UHF sensors
  • Method for rapidly positioning local discharging source based on two UHF sensors

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0036] The specific embodiment of the present invention is as figure 1 , figure 2 , image 3 , Figure 4 and Figure 5 shown.

[0037] The portable partial discharge UHF signal locating device of the embodiment of the present invention consists of a first UHF sensor 11, a second UHF sensor 12, a UHF signal conditioning unit 2, a first optional filter assembly 31, a second optional filter assembly 32 and The data acquisition unit 4 is composed. Data acquisition unit 4 connects the output end...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 刘明军周求宽黄成军
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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