On-line Automatic Monitoring and Diagnosis System of Cable Insulation Status

Abstract

The invention provides a cable insulation state online automatic monitoring and diagnosis system. A real-time data acquisition module acquires discharge data of a cable; a data automatic analysis and processing module processes and analyzes the data and calculates earth leakage capacitive reactance and impedance of the cable, expresses change of the cable insulation state through the change trend of earth leakage capacitive reactance and impedance, sets an early warning threshold with an average value obtained through long term of measurement and calculation acting as a reference value and compares a real-time measurement result with the reference value to obtain relative deviation which is compared with the early warning threshold; a change curve drawing module draws a real-time cable insulation change curve so as to obtain a cable insulation change trend curve and draw an impedance change curve; a cable insulation fault early warning module performs early warning; and a database module is used for storing the acquired data and the results of the aforementioned modules. Monitoring and fault diagnosis can be automatically performed so that the aspect of accuracy of cable insulation monitoring and fault line selection can be powerfully and reliably guaranteed.

Description

technical field [0001] The invention relates to the technical field of cable power supply, in particular to an online automatic monitoring and diagnosis system for cable insulation status. Background technique [0002] Cable power supply has been used more and more widely because of its advantages of safety, reliability, beautification of cities and layout of factories and mines. The cable can adapt to various laying environments such as underground and underwater, and can meet the needs of long-term and safe transmission of electric energy... Cable power supply is relatively safe for people, and natural meteorological factors (such as wind and rain, lightning, pollution, etc.) and the surrounding environment have little influence on cables. Most of the cables are buried underground. Once a fault occurs, it is very difficult to find it, which not only wastes a lot of manpower and material resources, but also causes incalculable power failure losses. How to accurately, quic...

AI Technical Summary

Problems solved by technology

Although the system only gives the hardware description of online monitoring, it cannot realize automatic diagnosis, nor does it involve the detailed processing technology for realizing online automatic monitoring and diagnosis.

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