开关柜无源无线测温系统是一款测温系统， 具有多种温度监测方式。目前应用最广泛的有三种。第一种是CT式，通过CT取电为传感器供电，但由于线路电流不一定，所以供电也不稳定，而传感器本身消耗能量的方式有限，长期大电流工作可能导致自身发热从而影响测温准确性。第二种是表面声波式，通过声波在不同温度环境下传播速度不同从而测量温度，此种方法同红外测温类似。第三种为RFID技术，主机通过一个发射机发射能量给无源传感器，传感器接收能量以后实现温度测量，然后通过无线回传给主机。

The passive wireless temperature measurement system of switchgear is a temperature measurement system, which has a variety of temperature monitoring methods. At present, there are three kinds of the most widely used. The first is the CT mode, which supplies power to the sensor by CT, but the www.jiaodaijiqi.cnwww.yanglaoyuann.cnwww.sjzbaojie.net.cnwww.wufengwantou.cn

www.wushuichulii.com.cnwww.wushuichul.com.cnpower supply is not stable because of the uncertain line current, and the energy consumption of the sensor itself is limited. Long-term high current operation may lead to its own heating, thus affecting the accuracy of temperature measurement. The second is surface acoustic wave, which can measure temperature by different velocity of sound wave propagation in different temperature environments. This method is similar to infrared temperature measurement. The third is the technology of RFID. The host transmits energy to passive sensors through a transmitter. The sensor receives energy to measure temperature, and then transmits it back to the host through wireless.