An ultrahigh frequency partial discharge detection system calibration method

Abstract

The invention relates to the technical field of partial discharge detection and in particular provides an ultrahigh frequency partial discharge detection system calibration method. Devices used by the method include a pulse signal source, a GTEM cell, a single-pole standard probe, a high speed digital oscilloscope and a measurement and control computer. The method calibrates an ultrahigh frequency partial discharge detection system by detecting the frequency domain equivalent height of a detected ultrahigh frequency sensor, the sensitivity of the ultrahigh frequency partial discharge detection system and the dynamic range of the ultrahigh frequency partial discharge detection system; detection results are expressed as a unified dimension, and the physical nature of detected objects is reflected; the method takes into full consideration the installing structure of the ultrahigh frequency sensor for detection thereof and fully reflects the engineering practice detection capability thereof; when being used for detection of the ultrahigh frequency partial discharge detection system, the method has the advantages of high shield effectiveness, stable testing results and less influence from external environment disturbance.

Description

Technical field [0001] The invention relates to the technical field of partial discharge detection, in particular to a calibration method of a UHF partial discharge detection system. Background technique [0002] Partial discharge ultra-high frequency online detection is a recognized high-sensitivity and high-efficiency detection technology for discovering potential insulation defects of high-voltage power equipment. With the deepening of the state maintenance of the power system in our country, the application of partial discharge ultra-high frequency (UHF) detection technology in high-voltage electrical equipment (GIS, cables, power transformers, etc.) is becoming more and more extensive. Especially for GIS, this technology has become the most important online monitoring method, and at this stage it has entered the stage of large-scale promotion and application across the country. However, the construction of relevant technical standards and specifications for partial discharg...

AI Technical Summary

Problems solved by technology

However, the construction of technical standards and specifications related to partial discharge ultra-high frequency (UHF) detection lags behind. So far, no consistent and effective evaluation method has been formed internationally, and this aspect is still in a blank stage in China.

Due to the lack of uniform standards and scientific and effective means in the industry to quantitatively evaluate the performance of UHF sensors and UHF partial discharge detection devices, the product level is uneven, which is not conducive to the selection and procurement of operating units, and cannot effectively guarantee network access detection equipment quality level

Engineering practice has found that a large number of UHF sensors and UHF partial discharge detection devices that have been installed have false alarms and false alarms, which not only cause waste of investment, but also cause very bad effects, seriously hindering the promotion and application of UHF partial discharge technology and Affects the effectiveness of condition-based maintenance work

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