城市电网高压电缆光纤传感在线监测技术比对试验研究

Experimental Research on Comparison of Fiber Sensing Technology for Urban Power Grid Transmission Cables On-line Monitoring

文中建立了用于高压电缆的温度在线监测的光纤传感系统,针对电缆不同部分的测量需求,采用不同的光纤传感原理分别进行了温度测量。通过模拟电缆隧道进行了有针对性的试验,试验结果表明,布里渊温度测量系统的精度可达2℃,布里渊散射频率与温度变化呈严格的线性关系;拉曼温度测量系统的精度可达0.5℃;拉曼温度测量系统适用于通过监测热点温升电缆局部缺陷;布里渊温度测量系统适用于电缆全段的温度测量,实现动态载流量;点式光纤光栅温度测量需要注意消除电缆温度变化导致形变的干扰。

This paper established the optical fiber sensing system ot transmission cable temperature measurement, by using different optical fiber sensing principle to meet the measurement demand of different parts of power cable. The experiment was carried out by simulating the targeted test cable tunnel, the experiment showed that the tem- perature measurement precision of Brillouin measurement system was 2 ℃, Brillouin scattering frequency shift was strictly linear relationship with temperature change, the temperature measurement precision of Raman measure- ment system was 0.5 ℃. The Raman measurement system is suitable for monitor the cable defect though temperature rise measurement, the Brillouin measurement system is suitable for monitor the current capacity by long distance pow- er cable temperature measurement, the Fiber Bragg Grating system measurement need denoise the thermal expansion.