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A method for online diagnosis of overheating fault of cable terminal

A cable termination and fault technology, which is applied to the fault location, detects faults by conductor type, and measures electricity, etc., can solve problems such as cable termination explosion, non-standard cable termination manufacturing process, and power system outage.

Active Publication Date: 2020-04-24
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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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

Method used

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  • A method for online diagnosis of overheating fault of cable terminal
  • A method for online diagnosis of overheating fault of cable terminal
  • A method for online diagnosis of overheating fault of cable terminal

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Embodiment Construction

[0075] The present invention will be further described below in conjunction with accompanying drawing:

[0076] figure 1 A schematic diagram of the overall structure of the device used in the present invention. Cable terminal temperature detection device, the edge of the isolation protective shell 38 is composed of M3 No. 1 bolt 42, No. 2 bolt 41, No. 3 bolt 25, No. 4 bolt 47, No. 5 bolt 48, No. 6 bolt 44, No. 7 Bolt No. 39, No. 8 Bolt No. 439 Bolt No. 4610 Bolt 45 is reinforced; the cable terminal joint 1 protrudes from the left port 11 of the isolation protective case 38, and the cable body 50 protrudes from the right port 9; the refrigeration system is mainly fixed on the isolation protective case 38 No. 1 refrigerating plate 18, No. 2 refrigerating plate 19, No. 3 refrigerating plate 20, No. 4 refrigerating plate 21, No. 5 refrigerating plate 22 on the upper inner wall 23, and No. 6 refrigerating plate 17 and No. 7 refrigerating plate symmetrically fixed on the lower inne...

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Abstract

The invention discloses an online method for diagnosing the overheating fault of a cable terminal, which can monitor the temperature change of the cable terminal at all times during operation. When the temperature rises to an abnormal operating temperature, an alarm can be issued. The built-in partial discharge test expansion system can facilitate the external connection of local The discharge tester detects the partial discharge of the overheated cable terminal, and calculates and processes the relevant data of the obtained discharge amount-phase spectrum and discharge times-phase spectrum to obtain the maximum discharge amount-average discharge amount-minimum discharge accumulation correlation The coefficient λ, analyzes the degree of failure occurring at the cable terminal. The invention can improve the troubleshooting efficiency of staff and reduce the occurrence rate of accidents 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01R31/08G01K1/02G05D23/20
CPCG01R31/1272G01R31/086G01K1/026G05D23/20
Inventor 周利军邢立勐白龙雷曹伟东李丽妮车雨轩郭蕾
Owner SOUTHWEST JIAOTONG UNIV
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