热电偶法测电气产品表面温升的探讨

Discussion on measuring the surface temperature rise of electrical products with thermocouples

温升测试是电气类产品通用检验项目中的重要安全参数,其准确性对产品的品质和性能至关重要。很多标准对温升的测量方法描述得不够详细,导致测量中会出现影响结果的偏差。在某次热电偶法测电气产品表面温升的能力验证中发现本实验室测量数据偏低,需要找到影响温升数据准确性的原因并纠正。通过使用质控样品,对热电偶的固定材料和测试环境进行了试验对比与分析,找到温升数据偏低的原因是热电偶与被测表面接触不良和测量环境中空调造成的空气对流。使用高温胶带和控制测试环境中的空气对流后,试验数据取得了满意的结果。此次研究结论有利于温升测试能力的控制与优化。

Temperature rise test is an important safety parameter in the general inspection items of electrical products,and its accuracy is crucial to the quality and performance of products.Many standards do not describe the measurement methods of temperature rise in enough detail,resulting in deviations in the experiment that affect the results.In the ability test to measure the surface temperature rise of electrical products by thermocouple method,it was found that the measurement data in our laboratory was low.We need to find out the reasons affecting the accuracy of the temperature rise data and correct them.Through the use of quality control samples,several fixed materials of the thermocouple and the test environment were compared and analyzed.It was found that the low temperature rise data was due to the poor contact between the thermocouple and the measured surface and the air convection caused by the air conditioning in the measurement environment.Satisfactory results were obtained by using high-temperature tape and controlling air convection in the test environment.The conclusion of this study is conducive to the control and optimization of temperature rise measurement capability.