油纸电容型绝缘损耗因数的温度特性

Temperature Characteristic of Dielectric Loss Factor of Oil-impregnated Insulation

对北京供电局电容型电流互感器多年的预防性试验数据分析 ,发现在温度变化≯ 4 0°C范围内 ,绝缘良好设备的介损变化幅度绝大部分≯ 0 .3% ,远小于介损监测值的平均波动幅度 ;而有绝缘缺陷设备的介损随温度增加的幅度较大。研究表明 ,设备介损的温度特性不是影响介损监测数据不稳定的主要原因。

Based on the analysis of many years preventive test results of capacitive current transformers in Beijing Power Supply Bureau, it is found that, if temperature change is less than 40°C , the change range of tan δ of equipment in good insulation condition is mostly less than 0 3%, it is far smaller than the average fluctuation range of tan δ inspection value. But for imperfect insulation equipment, tan δ value apparently changes with increase of temperature. The conclusion is that the temperature property of tan δ of equipment is not the major reason for instability of tan δ inspection data.