Fiber optic temperature measurement method is good for cable joint temperature monitoring

Волоконно-оптичний датчик температури, Інтелектуальна система моніторингу, Виробник розподіленого волоконно-оптичного волокна в Китаї

Why do power cable joint contacts heat up

With the development of the economy and society, the electricity consumption of economic production and people’s lives is rapidly increasing, which to some extent increases the transmission burden of the power grid. Due to the inherent resistance of transmission lines, they convert a certain amount of electrical energy into thermal energy when transmitting current, causing the lines to generate heat. If the heat is too high, it is easy to damage the transmission lines, and in severe cases, it may cause widespread power outages. In the actual transmission process, if the cable is long, electrical contacts need to be set at certain intervals. Electrical contacts are an important component of cable equipment. If there are problems such as poor contact, loose compression joints, and damaged insulation strength, it may cause an increase in cable temperature. Due to the difficulty of avoiding the heating problem of electrical contacts in cable equipment with current technology, precise monitoring and early warning of the temperature of electrical contacts in cable equipment is of great significance for maintaining the safe and stable operation of cable equipment.

The rapid development of smart grids has made real-time access to the operational status information of power system equipment an important part of ensuring the safe operation of the power system. Compared to overhead transmission lines, power cables have the advantages of occupying less land and higher reliability, and their proportion in urban transmission and distribution networks is increasing day by day. Однак, the large number of cable joints in cable lines is a weak link in the operation of power systems, among which temperature is the main factor restricting the safe operation of joints. Due to poor manufacturing and installation processes, excessive contact resistance, and other factors, power cable joints are prone to abnormal temperature rise during high voltage and high current operation, accelerating insulation aging. If abnormalities are not detected in a timely manner, it will cause fire accidents and affect the normal operation of the system. Тому, real-time monitoring of cable joint temperature, timely detection of temperature anomalies, and troubleshooting are of great significance for ensuring the safe operation of the power system.

What is the best method for temperature monitoring of cable joints

Traditional cable joint temperature monitoring is completed through regular manual inspections, but this method requires a large amount of work and is difficult to achieve timely and accurate monitoring. Some manufacturers use thermal resistors to monitor the temperature of cable joints in real time, but thermal resistors are prone to oxidation and should not be used in high temperature and humid environments. Fiber optic temperature measurement technology monitors cable temperature. Fiber optic temperature measurement has the advantages of strong electromagnetic interference resistance and reliable signal transmission. Однак, laying fiber optic cables requires a large investment and is prone to breakage, making maintenance difficult in the later stage.

With the rapid development of sensing technology and computer technology, fluorescent fiber temperature online monitoring has gradually become an effective means of cable temperature monitoring. Fluorescent fiber optic temperature sensors can achieve multi-point contact temperature measurement, with advantages such as high measurement accuracy, low power consumption, and strong anti-interference ability. They are widely used in current temperature monitoring systems. The online temperature warning system for electrical contacts of fluorescent fiber optic temperature measurement cable equipment includes a monitor module, an internal communication conversion module, and a warning module. By implementing a specific temperature warning process, based on accurate warning of the electrical contact temperature of cable equipment, over temperature data is alerted, achieving effective warning and maintaining the safety of cable equipment.