高压XPLE电缆中间接头线芯声表面波测温技术研究

Research on Surface Acoustic Wave Temperature Measurement Technology for High Voltage XPLE Cable Intermediate Joint Core

为实现高压XPLE电缆中间接头线芯运行温度的直接测量,研制了一种植入式无源无线声表面波(SAW)测温装置。该植入式SAW温度传感器主要由433 MHz偶极子天线和谐振型SAW谐振器组成,封装在厚度仅16 mm的圆环内,安装时直接套在电缆接头线芯上。通过对读取器射频电路进行优化设计,如配置高增益偶极子天线、低噪声放大器,接收机抗干扰设计等,实现传感器信号高灵敏检测。采用扫频法确定SAW传感器的谐振频率。通过离线测试确定了读取天线布置位置以及SAW传感器谐振频率-温度特性。110 kV电缆交流耐压与温升试验结果表明,在电缆线芯承受2倍额定相电压,电流大于1.9 kA和运行温度超过允许的90℃条件下,所研制的样机无线通信良好,能够实现电缆中间接头线芯直接测温。

To direct measure the operating temperature of high voltage XPLE cable intermediate joint core,a kind of implantable passive wireless surface acoustic wave(SAW)temperature measuring device is developed.The implantable SAW temperature sensor is mainly composed of 433 MHz dipole antenna and SAW resonator.It is packaged in a ring with a thickness of only 16 mm and easy to be direct installed on the core of the cable connector.By optimizing the RF circuit design of the reader,such as adopting high gain dipole antenna,low-noise amplifier and anti-interference design of receiver,high sensitivity detection of sensor signal is realized.The resonant frequency of SAW sensor is determined by frequency scan method.The position of read antenna and resonant frequency-temperature characteristic of SAW sensor are derived by off-line test.The AC withstand voltage and temperature rise test results of 110 kV cable show that under the condition that the cable core bears twice the rated phase voltage,the current value is bigger than 1.9 kA and the operating temperature exceeds allowable 90℃,the wireless communication of developed prototype is good,and the direct temperature measurement of cable intermediate joint core can be realized.