Detection Model of ESDD and NSDD of Insulators Contamination Based on Microwave Radiation Theory
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摘要: 用微波辐射计测量绝缘子污秽表面亮度温度,从而可获得污秽的辐射能量特性。提出用亮度温度计算绝缘子污秽等值附盐密度(equivalent salt deposit density,ESDD)、等值附灰密度(non-soluble deposit density,NSDD)的检测模型以及盐密和灰密乘积形式的检测模型。在不同测量角度下,研究干燥(相对湿度20%)和湿润(表面形成水膜)条件下,ESDD和NSDD与天线温度的关系,同时研究天线温度与环境温度及湿度的关系,并分析湿度对模型参数的影响。结果表明:ESDD和NSDD对天线温度的影响是独立的,通过测量天线温度可以同时测定ESDD和NSDD。Abstract: The brightness temperature of the insulator contamination was measured with microwave radiometer to gain the radiation energy characteristics of contamination.A detection model to calculate the equivalent salt deposit density（ESDD） and non-soluble deposit density（NSDD） was proposed through detecting the antenna temperature of insulators contamination with microwave radiometer,and a product model of ESDD and NSDD was proposed.Under dry（relative humidity 20%） and wet（surface water film） conditions,the relationship between the antenna temperature and ESDD as well as NSDD was studied,and the relationship between the antenna temperature and ambient temperature as well as air humidity respectively was studied in the case of different measurement angles.The impact of humidity on the model parameters was analyzed.The results show that both ESDD and NSDD are mutually independent as for the influence on the antenna temperature,and ESDD and NSDD can be simultaneously measured by measuring antenna temperature.
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