Распределенная волоконно-оптическая система измерения температуры силовых кабелей, factory in China-INNO

Why do power cables need temperature measurement

In power supply lines, cable joints are the weakest link in the safe operation of the power system. По статистике, cable joint accidents account for a large proportion of cable accidents. The reason is that the cable joints have problems such as poor contact, ослабленные компрессионные соединения, и нарушенная прочность изоляции. В условиях повышенной электрической нагрузки или жаркой погоды., abnormal temperature increases may occur, which not only may cause cable damage but also lead to large-scale power outages and even fire accidents.

After the cable is laid, in order to make it a continuous line, each section of the line must be connected as a whole through cable joints. Однако, due to the skin effect of charges, eddy current loss, and insulation medium loss, additional heat is generated, which causes the temperature of the cable to rise. When the load current of the cable is too large, the temperature of the cable joint will rise sharply, causing the core wire to heat up and causing a fire; Кроме того, there are gaps at the cable joints, which can allow rainwater to seep in and cause the cable joints to become damp, приводящие к несчастным случаям.

В настоящий момент, staff generally manually measure the temperature at the cable joint, which increases the workload of the staff, and cannot measure the temperature in real time, making it difficult to timely understand the situation in the event of an accident.
В итоге, the existing technical problem is that the staff manually measures the temperature at the cable joint, which increases the workload of the staff and makes it difficult to timely understand the situation in the event of an accident; Lack of corresponding protective devices at cable joints can easily lead to accidents caused by moisture in cable joints.

In order to reduce intermediate joint failures, on the one hand, emphasis should be placed on improving the quality of cable products and on-site production processes, и с другой стороны, monitoring and diagnosis should be strengthened. В настоящий момент, the main monitoring methods for power cables include online monitoring of insulation resistance, онлайн-мониторинг частичного разряда, online monitoring of DC component method, и онлайн-мониторинг температуры. Температура, как неэлектрическая величина, is an important parameter reflecting the operating status of cables. The occurrence of various faults in intermediate joints is not a sudden process. It is usually due to the continuous increase in temperature, старение изоляции, increased contact thermal resistance, and increased leakage current before thermal breakdown occurs, which is a process from quantitative to qualitative change. By monitoring the temperature of the intermediate joint in real-time and analyzing historical data, the location of insulation defects can be determined, and the insulation condition of the intermediate joint can be grasped. Кроме того, excessive current carrying capacity of power cables can cause the working temperature of the cable core to exceed the allowable value, resulting in a shortened insulation life of the cable compared to the expected value; If the current carrying capacity is too small, it will make the copper or aluminum materials of the wire core unable to be fully utilized. Поэтому, the real-time measured temperature value can be used to calculate the temperature of the wire core conductor to achieve the purpose of load regulation and dynamic capacity increase.

Effective monitoring of the temperature of intermediate joints in power cables can determine local overheating points, оценить условия старения изоляции, and timely detect safety hazards through real-time monitoring values and historical temperature values; В то же время, real-time monitoring values can also be used to calculate the temperature of the wire core conductor, что имеет большое значение для обеспечения надежности, стабильность, и экономичность энергосистемы за счет разумного использования мощности силовых кабелей для регулирования нагрузок и динамического увеличения мощности в допустимом диапазоне..

The distributed fiber optic temperature measurement system for power cables can monitor the temperature of the cables online and accurately locate the heating fault points of the cables. Monitoring on-site safety and reliability, accurate measurement, и хорошая стабильность; Точность измерения температуры достигает ± 1 ℃, is not affected by electromagnetic interference, and the sensor does not need to be calibrated for long-term use; В реальном времени онлайн, 24-hour monitoring, 24/7 на дежурстве, устранение человеческой халатности; Strong scalability: The temperature measurement system can adopt single to multiple channels, which can be easily connected to the internal power network and support various communication protocols and specifications; Fast temperature measurement speed, using synchronous scanning and parallel detection technology, temperature data collection and transmission can be completed within seconds; Can achieve measurement of temperature rise rate, providing strong technical support for temperature monitoring; Remote transmission, with distances ranging from several kilometers to tens of kilometers, is easy to network.