An elbow cable head fault early warning method and system based on distributed temperature measurement

Abstract

The invention discloses a method and system for early warning of elbow cable head faults based on distributed temperature measurement. The method includes: obtaining the surface temperature of each position of the elbow cable head in real time; Establish a regional thermal circuit model; respectively establish the relationship between the hierarchical model parameters of each layer in a certain area and the surface temperature change in a certain area; based on the data fitting of the hierarchical model parameters of each layer, the regional model of a certain area can be obtained The relationship between parameters and the surface temperature of a certain area; the surface temperature of a certain position of the elbow cable head is input into the regional thermal circuit model corresponding to a certain position of the elbow cable head, and the internal temperature of a certain position is output. Fitting the hierarchical model parameters of each layer in each region, thereby establishing the relationship between the regional model parameters of each region and the surface temperature of the corresponding region, effectively improving the accuracy of the calculated temperature at each position of the internal conductor.

Description

technical field [0001] The invention belongs to the technical field of safe operation of power equipment, and in particular relates to an elbow cable head fault early warning method and system based on distributed temperature measurement. Background technique [0002] Elbow cable heads are generally used in box-type equipment such as ring network cabinets, switch stations, and cable branch boxes. With the increase in the cabling rate of the distribution network, the use of elbow cable heads has increased significantly. During the operation of the distribution network, it is found that the elbow-shaped cable head is the most prone to failure in the box-type equipment, and the fault of the elbow-shaped cable head will affect the safety and stability of the distribution network operation. Therefore, it is necessary to study the fault early warning scheme of the elbow cable head, so as to maintain in time before the fault occurs and ensure the safe operation of the distribution...

AI Technical Summary

Problems solved by technology

The existing temperature measurement methods are mainly point temperature measurement or line temperature measurement, and it is difficult to monitor the temperature of the elbow cable head in an all-round way

And because the cabinet door cannot be opened when the elbow cable head is running, live detection work such as infrared temperature measurement and ultrasonic partial discharge cannot be carried out, and it has been in a state of no inspection for a long time

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