Method of online diagnosis for overheat fault of cable terminal

Abstract

The invention discloses a method of online diagnosis for overheat fault of a cable terminal. With the method, temperature change during operation of the cable terminal can be monitored constantly, andwhen temperature rises to non-normal operation temperature, alarm can be given, a built-in local discharge test expansion system can conveniently and externally connect a local discharge tester to perform local discharge detection for the cable terminal with excessive temperature, and by performing calculation treatment for related data of obtained discharge capacity-phase spectrum q-Phi and discharge times-phase spectrum n-Phi, maximum discharge capacity -average discharge capacity -minimum discharge capacity accumulation related coefficient lambda is obtained, and extent of a fault happenedat the cable terminal can be analyzed. The method provided by the invention can improve fault removal efficiency of workers and reduce accident rate as much as possible.

Description

technical field [0001] The invention belongs to the field of overheating protection and fault detection of cable terminals in distribution networks, and in particular relates to an online diagnosis method for overheating faults of cable terminals. Background technique [0002] Due to the non-standard manufacturing process of the cable terminal, the fracture of the shielding metal tape causes damage to the main insulation, the loosening of the constant force spring leads to insufficient contact between the grounding wire and the copper shielding, resulting in a short circuit and other mechanical damage, resulting in long-term operation in the distribution network. The temperature of the cable terminal is too high, the cable terminal explodes, the power system is out of service and other failures. At present, in China, the terminal is generally positioned and detected after the cable terminal fails. There are few equipment and methods for temperature monitoring, protection and...

AI Technical Summary

Problems solved by technology

[0002] Due to the non-standard production process of the cable terminal, the fracture of the shielding metal tape causes damage to the main insulation, the loosening of the constant force spring leads to insufficient contact between the grounding wire and the copper shielding, resulting in a short circuit and other mechanical damage, resulting in long-term operation in the distribution network. The temperature of the cable terminal is too high, the cable terminal explodes, the power system is out of service and other faults

At present, in China, the terminal is generally positioned and detected after the cable terminal fails. There are few equipment and methods for temperature monitoring, protection and detection before the cable terminal fails. In order to better make the cable terminal run normally and safely, it is urgently needed A Method of Online Diagnosis of Overheating Fault of Cable Terminal

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