Localizable ultrahigh-frequency cable partial discharge detection method and device

Abstract

The invention discloses a localizable ultrahigh-frequency cable partial discharge detection method and device. The invention is characterized in that a data synchronous acquisition module comprises two high-speed acquisition channels and one low-speed acquisition channel, two ultrahigh-frequency sensors and one power-frequency signal sensor are externally connected for synchronous acquisition of ultrahigh-frequency partial discharge signals, environment signals and power-frequency voltage signals below 1GHz, and the ultrahigh-frequency sensors are directly arranged on a cable; an analyzing and processing module compressively analyzes the acquired synchronous data by the five combined method, effectively identifies cable partial discharge signals and external noise interference and further realizes partial discharge positioning; a power denoising module is used to prevent introduction of noise interference by a portable power source during outdoor use; and a user control terminal has the functions of data acquisition display, result analysis, historical data review and real-time report printing. The invention makes it possible to detect and position partial discharge of power cables, improves the reliability of partial discharge detection and realizes accurate judgment on partial discharge.

Description

technical field [0001] The invention relates to the field of partial discharge detection in power systems, in particular to a method and device for detecting partial discharge of UHF cables that can be positioned. Background technique [0002] In recent years, the proportion of high-voltage XLPE power cables in urban power lines is increasing, and the degree of attention is also increasing. It plays a pivotal role in ensuring the electricity consumption of urban residents. Since the 1980s and 1990s, XLPE cables with a voltage level of 110kV have been introduced in China. Some cables that are still in operation have entered the "middle-aged" period of their expected life, and even a considerable number of high-voltage cables are in an overloaded and sick operating state. In addition, there are problems such as the quality of the cable body, the quality of the installation and laying of accessories, and external damage, which makes this problem more prominent, and the failure ...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects that the existing cable partial discharge detection equipment is inaccurate and unable to realize cable partial discharge location, the present invention provides a positionable UHF cable partial discharge detection method and device, which adopts UHF partial discharge detection With independent multi-channel synchronization technology, the sensor directly measures the cable body or accessories to be tested, accurately collects medium and low frequency, high frequency, very high frequency and UHF partial discharge signals, obtains complete cable partial discharge information, and uses dual-channel differential to effectively denoise , the characteristic confidence interval identifies the real PD signal from the cable, and the five-way multi-parameter comprehensively determines the partial discharge situation and realizes the location of partial discharge defects, providing effective support for early detection of dangerous cable defects and ensuring the safety of power cables and their accessories run

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