Elbow type cable head fault early warning method and system based on distributed temperature measurement

Abstract

The invention discloses an elbow-type cable head fault early warning method and system based on distributed temperature measurement. The method comprises the following steps of acquiring the surface temperature of each position of an elbow-type cable head in real time; dividing the elbow-type cable head into regions, and establishing a region thermal circuit model based on each region; respectively establishing a relationship between hierarchical model parameters of each layer of a certain area and the surface temperature change of the certain area; data fitting being carried out based on the hierarchical model parameters of each layer so that the relation of the area model parameters of a certain area changing along with the surface temperature of the certain area is obtained; and inputting the surface temperature of a certain position of the elbow-type cable head into the regional thermal circuit model corresponding to the certain position of the elbow-type cable head, and outputting the internal temperature of the certain position. The method is advantaged in that the hierarchical model parameters of each layer in each region are fitted, so the relationship between the region model parameters of each region and the surface temperature change of the corresponding region is established, and accuracy of the calculated temperature of each position of the internal conductor is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of safe operation of electric equipment, and in particular relates to an elbow-type 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, switching stations, and cable branch boxes. With the increase of distribution network cable rate, the usage of elbow cable head has increased significantly. During the operation of the distribution network, it is found that the elbow cable head is the most prone to failure in the box-type equipment, and the failure of the elbow cable head will affect the safety and stability of the distribution network operation. Therefore, it is necessary to study the early warning scheme of the elbow cable head fault, so as to maintain in time before the fault occurs and ensure the safe operation of the distribution network. ...

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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