Sistema di misura distribuito della temperatura in fibra ottica per cavi di alimentazione, 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. Secondo le statistiche, cable joint accidents account for a large proportion of cable accidents. The reason is that the cable joints have problems such as poor contact, giunti di compressione allentati, e resistenza dell'isolamento danneggiata. In ambienti con carico elettrico elevato o climi caldi, abnormal temperature increases may occur, which not only may cause cable damage but also lead to large-scale power outages and even fire accidents.

Dopo aver posato il cavo, in modo da renderla una linea continua, ogni tratto di linea dovrà essere collegato nel suo insieme tramite giunti in cavo. Tuttavia, a causa dell'effetto pelle delle cariche, perdita di correnti parassite, e perdite medie di isolamento, viene generato ulteriore calore, che fa aumentare la temperatura del cavo. Quando la corrente di carico del cavo è troppo grande, la temperatura del giunto del cavo aumenterà notevolmente, provocando il surriscaldamento del filo centrale e provocando un incendio; Inoltre, ci sono degli spazi vuoti sui giunti dei cavi, che possono consentire all'acqua piovana di penetrare e causare l'umidità dei giunti dei cavi, portando ad incidenti.

Attualmente, 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.
In sintesi, 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, da un lato, emphasis should be placed on improving the quality of cable products and on-site production processes, e d'altra parte, monitoring and diagnosis should be strengthened. Attualmente, the main monitoring methods for power cables include online monitoring of insulation resistance, online monitoring of partial discharge, online monitoring of DC component method, and online monitoring of temperature. Temperatura, as a non electrical quantity, 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, invecchiamento dell'isolamento, 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. Inoltre, 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. Perciò, 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, valutare le condizioni di invecchiamento dell'isolamento, and timely detect safety hazards through real-time monitoring values and historical temperature values; Allo stesso tempo, real-time monitoring values can also be used to calculate the temperature of the wire core conductor, che è di grande importanza per garantire l'affidabilità, stabilità, ed economia del sistema di alimentazione utilizzando ragionevolmente la capacità dei cavi di alimentazione per regolare i carichi e aumentare dinamicamente la capacità entro l'intervallo consentito.

IL 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, and good stability; La precisione della misurazione della temperatura raggiunge ± 1 ℃, non è influenzato da interferenze elettromagnetiche, and the sensor does not need to be calibrated for long-term use; Real time online, 24-hour monitoring, 24/7 on duty, eliminating human negligence; Strong scalability: IL sistema di misurazione della temperatura 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.