基于红外的GIS内部导体温度检测技术研究

为预防气体绝缘金属封闭开关设备(GIS)触头过热缺陷,解决传统测温技术无法实现GIS设备内部触头温度准确检测的难题,提高GIS设备内部触头温度的测量精度,提出一种基于红外热成像GIS内部导体温度检测技术。通过不同光程和气压条件下SF_6吸收率试验,对影响红外测温精度的光程和SF_6气体压力进行分析,得到光程、气体压力与温度修正值的关系,并计算得到温度补偿算法;将该温度补偿算法应用在红外测温装置中,能够根据被测物的光程和SF_6气体压力准确测得GIS内部导体实际温度。最终的试验结果显示,该红外测温仪在加入补偿算法后能够较准确地测量出GIS设备气室内触头的实际温度。

Temperature detection of internal conductor in GIS based on infrared thermal imaging

In order to prevent the over heating defects of gas-insulated metal-enclosed switchgear(GIS) contacts and solve the problem of unable to measure the temperature of internal conductor in GIS by traditional temperature measurement, high-accuracy temperature detection of internal conductor in GIS based on infrared thermal imaging is proposed. Through a series of tests, the depth analysis of the optical path factors and the pressure of the SF₆ gas which have an impact on the accuracy of infrared temperature, the concrete relationship among the optical path factors, the pressure of the SF₆ gas and the measurement accuracy is gained. So is the compensation formula. According to the distance of the measured objects and the pressure of SF₆, a set of algorithm improving the measurement accuracy of infrared radiation thermometer to obtain the actual temperature of the contact measured is designed. It can combine with exact temperature compensation calculated by compensation formula. The final result of test shows that the infrared radiation thermometer with compensation algorithm can measure the temperature of the contacts in GIS more accurately.