With the rapid development of the social economy, the demand for electric power is increasing day by day, and power line construction is growing synchronously. Meanwhile, with the continuous acceleration of urban construction, considering urban space and reliability, the undergrounding rate of power lines keeps increasing. Therefore, mixed power lines of overhead lines and cables appear more and more in the power distribution network, mainly in the forms of overhead line — power cable tunnel — overhead line, overhead line — power cable tunnel, and power cable pipe jacking/direct burial — overhead line. At present, the detection methods for cable lines in these mixed forms are still blank in China. Most domestic solutions use detection equipment for cable joint temperature measurement, but the expandability is not strong — they can only measure the temperature at cable joints and cannot detect the cable line temperature. In order to achieve real-time monitoring of cables, we have developed a cable distributed fiber optic temperature measurement system.

The distributed fiber optic temperature measurement system can realize multi-point, online distributed measurement. It uses optical cable to sense temperature information and transmit temperature information at the same time, featuring high temperature resistance, electromagnetic radiation resistance and wideband testing, thereby greatly improving temperature resolution and spatial resolution, and can effectively solve urgent problems such as continuous high temperature. The high-voltage cable distributed fiber optic temperature measurement detection system has the advantages of reasonable design and low detection cost, and can realize real-time monitoring of cable line temperature, facilitating cable maintenance work. The cable distributed wireless temperature measurement system can measure the cable temperature in real time and feed back the detection data to the monitoring system immediately, facilitating the power monitoring center to make immediate operation and maintenance dispatch. Moreover, the whole temperature measurement system can obtain a stable and reliable DC power supply, ensuring the stability and reliability of the whole system. The whole circuit structure is simple and reliable, which can effectively reduce cost and operating cost.