Correction Method of Surface Temperature Difference of UHV Heating Equipment under the Influence of Environmental Factors
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摘要: 1000 kV电容式电压互感器（Capacitor Voltage Transformer, CVT）、1000 kV气体绝缘金属封闭开关设备GIS（Gas Insulated Switchgear）出线套管、1000 kV避雷器是特高压变电站内主要的电压致热型设备，其内部缺陷具有表面温差小、热点不明显的特点，且易受环境因素影响，通常需要在理想环境条件下开展红外精确测温进行缺陷诊断。然而若现场环境条件短时间内无法满足要求，则可能导致缺陷的进一步发展，因此有必要研究非理想环境条件下测温结果的修正方法。本文建立了3类特高压电压致热型设备的温度场仿真计算模型，结合传热学理论研究了光照强度、环境温度、风速大小等环境因素对特高压电压致热型设备表面温差的影响规律，结果显示，3种因素的增强均会导致表面温差不同程度地下降，需将其修正至理想环境条件下的真实温差。最后利用数据拟合的方法，获得各类环境因素影响下实测温差与真实温差的曲线表达式，进一步总结出非理想环境条件下特高压电压致热型设备表面温差的修正方法，并通过变电站现场应用验证了修正结果的准确性。Abstract: The main voltage heating equipment in UHV substations consists of 1000 kV CVTs, 1000 kV GIS outlet bushings, and 1000 kV arresters. They exhibit small differences in surface temperature and are easily exposed to environmental factors. Precise infrared temperature measurements are typically performed to diagnose defects under ideal environmental conditions. However, if the onsite environmental conditions cannot meet the requirements in a short time, further defects may occur. Therefore, it is necessary to study a correction method for temperature measurement results under non-ideal environmental conditions. In this study, three types of UHV heating equipment temperature field simulation models were established and combined with the theory of heat transfer to study the influence of environmental factors such as light intensity, temperature, and wind speed on the surface temperature difference of UHV heating equipment. The results revealed that the enhancement of these three factors decreased to varying degrees the surface temperatures that needed to be corrected to the true temperature difference under ideal environmental conditions. Finally, data fitting was used to obtain a curve expressing the measured and real temperature differences, and the correction method of the surface temperature difference of the UHV heating equipment under non-ideal environmental conditions. The accuracy of the correction results was verified through the field application of a substation.
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Keywords:
- environmental factors /
- voltage heating /
- infrared thermometer /
- correction method
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图 6 表面温差随环境温度变化规律
Figure 6. Surface temperature difference changes with environmental temperature
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图 8 缺陷设备红外精确测温图谱
Figure 8. Infrared precise temperature measurement spectrum of defective equipment
表 1 非理想环境条件参数
Table 1 Non-ideal environmental conditions parameters
Non-ideal environmental
conditionsLight intensity Temp-
eratureWind speed Condition 1: sunny summer day at noon 10000 lx 35℃ 2m/s Condition 2: overcast in autumn 200 lx 15℃ 6 m/s Condition 3: cloudy in summer 4000 lx 32℃ 4 m/s Condition 4: sunny winter 6000 lx 5℃ 2 m/s Condition 5: autumn evening 800 lx 23℃ 3 m/s 
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表 2 非理想环境条件下测温图谱
Table 2 Thermal images under non-ideal environmental conditions
Environmental conditions Spectrum of CVT Spectrum of arrester Condition 1 
Condition 2 
Condition 3 
Condition 4 
Condition 5 
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表 3 非理想环境条件下测试数据
Table 3 Test data under non-ideal environmental conditions
Condi-
tionsCVT Arrester τ/K τ0′/K Diagnostic results τ/K τ0′/K Diagnostic results Condi-
tion 10.22 2.21 Flawed 0.03 0.65 Flawed Condi-
tion 22.23 2.41 Flawed 0.66 0.71 Flawed Condi-
tion 30.86 2.28 Flawed 0.21 0.67 Flawed Condi-
tion 40.95 2.32 Flawed 0.35 0.67 Flawed Condi-
tion 51.84 2.36 Flawed 0.52 0.68 Flawed
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