基于红外传感的GIS隔离开关触头温度在线监测技术研究

Online GIS switch contact temperature monitoring based on IR sensing

为实现对触头温度的在线监测,针对GIS设备隔离开关的结构特点,提出了一种基于红外(IR)传感的适用于GIS设备触头温度在线监测的方法。因为金属导体表面发射率低,所以在金属导体触头表面涂敷高辐射涂料。针对SF6气体吸收红外光的影响,提出通过调节红外温度传感器的发射率来补偿SF6气体的吸收效应。建立了GIS试验平台,研究了SF6气体体积分数、红外滤光片和环境温度对红外测温的影响。实验结果表明,SF6气体体积分数的升高会导致红外温度传感器读数的下降,需要调低传感器的发射率进行补偿。最后根据所提方法设计了GIS设备触头温度在线监测系统。

According to the structural characteristics of the disconnecting switches in GIS equipments,an online contact temperature monitoring method based on IR（Infra-Red） sensing is proposed.Highly emissive coating is spread on the contact surface to enhance its emissivity and the emissivity of infrared temperature sensor is adjusted to compensate the absorption effect of SF6.A GIS experiment platform is established and the influences of SF6 concentration,IR filter and environmental temperature on IR sensing are researched.Experimental results show that,the indication of IR sensor reduces along with the increase of SF6 concentration,which could be compensated by lowering the emissivity of sensor.An online GIS contacts temperature monitoring system is designed based on the proposed method.