Method for monitoring aging of cable in metering box based on multi-parameter fusion

Abstract

The invention discloses a method for monitoring aging of a cable in a metering box based on multi-parameter fusion. The method comprises the following steps: S1, obtaining the infrared reflectivity R, the ultrasonic density attenuation rate D and the impact rebound speed V of a target cable and the environment temperature T and the environment humidity H of the position where the target cable is located; s2, numerical correction is carried out according to the environment temperature and the environment humidity, the infrared reflectivity Rcorr and the ultrasonic density attenuation rate Dcorr are obtained, and meanwhile, the impact rebound speed V is subjected to normalization processing to obtain Vnorm; s3, calculating the surface oxidation degree fR, the internal voidage fD and the elastic deterioration degree fV based on the numerical values in the step S2; s4, inputting the fR, the fD and the fV into a fuzzy rule base for comprehensive evaluation, outputting a comprehensive aging index (AOI), and triggering grading alarm according to an AOI threshold value; and S5, dynamically optimizing weight coefficients wR, wD and wV of the fR, the fD and the fV according to historical aging data to realize model adaptability. The cable aging monitoring can be realized under the condition that the environmental influence is eliminated, and the monitoring result is more accurate.

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