An expert analysis method for grounding current safety early warning of cables in tunnels

Abstract

The invention discloses a tunnel cable grounding current safety alarm expert analysis method. The tunnel cable grounding current safety alarm expert analysis method includes setting alarm threshold values and filtering conditions in a monitoring platform; loading serial numbers and name information of monitoring terminals in the monitoring platform; dividing grounding current abnormalities into three categories including jumping abnormality, absolute value abnormality and inter-phase comparison abnormality; sequentially judging whether grounding current acquired by the monitoring terminals are abnormal or not; filtering current abnormality analysis results and alarm when all the filtering conditions are met; outputting the filtered grounding current abnormality analysis results in the monitoring platform. The tunnel cable grounding current safety alarm expert analysis method has the advantages that alarm analysis of the tunnel grounding current can be achieved, so that current abnormalities can be monitored effectively; through the set threshold values of the filtering conditions of the abnormal current, the abnormal current meeting the filtering conditions can be alarmed, false alarm is prevented and alarm accuracy is improved.

Description

technical field [0001] The invention relates to a method for judging and analyzing whether there is abnormality in the grounding current, in particular to an expert analysis method for the safety early warning of the grounding current of cables in a tunnel. Background technique [0002] High-voltage cables laid in power tunnels are the lifeblood of cities. Once criminals illegally invade and destroy or steal the grounding cable, the temperature of the cable joint will rise, which may cause the cable joint to explode, causing serious losses to national property, and even threatening the lives of construction or maintenance personnel. [0003] Therefore, electric power companies urgently hope that when the grounding cable is damaged, stolen, or abnormally changed (mutated), the monitoring system can send an alarm signal to the on-duty personnel in time to remind the on-duty personnel and maintenance personnel through online real-time analysis of the grounding current and joint...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, when analyzing the grounding current fault, insufficient consideration is given to the peak and trough periods of normal current use, and false alarms are likely to occur; and there is no judgment on the abnormality of the phase-to-phase current, and the abnormality analysis is not comprehensive

[0005] The existing ground current fault analysis method only prevents false alarms by recording whether the abnormal number of fault currents reaches the threshold, the judgment conditions are simple, and the probability of false alarms is high

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