Cable head safety protection control device and control method thereof

Abstract

The invention provides a safety protection control device of a cable head. Through comprehensively judging working current, working temperature and arc light conditions of the cable head, the safety protection control device can be effectively used for monitoring the working state of the cable head and immediately stopping supplying power to the cable head under the condition of fault risks, so that safety protection is performed on the cable head, the service life of the cable head is prolonged, the damage rate of the cable head is decreased, and the cable head is prevented from exploding.

Description

technical field [0001] The invention relates to the technical field of electric power supply protection, in particular to a cable head safety protection control device and a control method thereof. Background technique [0002] In recent years, cable head damage accidents have occurred in substations and power plants one after another. Not only the cable head and cables are burned, but also it is easy to cause maintenance difficulties and cause long-term power outages in substations. In order to avoid or reduce the number of power outages, shorten the power outage time, improve the reliability of power supply, and reduce the accident rate of cable head damage, it is very important. [0003] When the cable head is faulty, it will be accompanied by changes in temperature, current curve deviation and arc light. The electric field of the cable head is a distorted electric field. The main reason for the distortion of the electric field is: when the cable joint is made, the coppe...

AI Technical Summary

Problems solved by technology

At the same time, the installation of the cable head is generally on-site installation, and the on-site installation conditions are poor, and impurities such as dust, gas, and moisture will inevitably invade the cable head, thereby affecting the insulation performance of the cable head; It will cause temperature fluctuations, which will lead to cable fatigue, increase plastic deformation, increase shrinkage, and affect insulation life and performance; the temperature change of sheath material is smaller than that of insulation, but fatigue creep will also affect cable protection to a certain extent life

When the cable head is aging due to various reasons, the resistance of the contact point increases. When the current has not reached the set value of protection, it will generate heat and the temperature is too high, which will lead to the explosion of the cable head and more serious chain accidents.

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