核电厂电阻温度计响应时间测量方法比对研究  

Study on Comparison of RTD Response Time Measurement Methods for Nuclear Power Plant

作　　者：宋延勇[1,2] 苏明旭 王子安[2] SONG Yanyong;SU Mingxu;WANG Zian(University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Inspection and Testing Institute of Instruments and Automation Systems Co.,Ltd,Shanghai 200233,China)

机构地区：[1]上海理工大学,上海200093 [2]上海仪器仪表自控系统检验测试所有限公司,上海200233

出　　处：《核科学与工程》2022年第6期1317-1324,共8页Nuclear Science and Engineering

摘　　要：电阻温度计响应时间是其关键技术指标之一。现有浸入式方法通常在实验室条件做离线测量,难以反映电阻温度计在实际安装工况条件下的动态响应特性。作者研制了一种基于回路电流阶跃响应(LCSR)的原位法响应时间测试装置,并就响应时间测量原理、方法和结果与浸入法进行了比对研究。在流速为(0.2~0.6)m/s的试验条件下,比较了二者在不同介质流速下测量结果偏差,并分析了流速对电阻温度计响应时间的影响。结果表明响应时间随流速增加而减小,两种方法测量结果呈现相似的变化趋势和分散性,且偏差均优于±10%,满足核电厂安全重要仪表通道性能监督试验标准(NB/T 20069—2012)的要求。LCSR法通过采用内部电流阶跃方式有效解决了浸入法须模拟安装条件下介质高速流动的困难,经实验室条件下的比对其与浸入法具有较好测量一致性,可进一步延伸至现场应用,适用于不同安装工况核电厂电阻温度计响应时间原位测量。The response time is one of the critical technical parameters of resistance temperature detectors. For the current immersion method, the off-line measurement is usually carried out in the laboratory, which cannot reflect the dynamic response characteristics of RTD under actual installation conditions. An in-situ response time measurement device based on loop current step response(LCSR) has been developed. Consequently, the principle, method and results of response time measurement are compared with those of immersion method. Under the test conditions of flow velocity(0.2-0.6) m/s, the measurement results of the two methods at different medium flow velocities are compared, and the influence of flow velocity on the response time of the RTD is analyzed too. The results show that the response time decreases with increasing flow rate. A deviation within ±10%, as well as similar variation trend and dispersion, can be observed between above mentioned methods, meeting the requirements of the performance monitoring test standard for instrumentation channels important to safety(NB/T20069-2012). By adopting the internal current step mode, LCSR effectively overcomes the difficulty of immersion method in simulating the high-speed flow of medium. It presents measurement consistency with immersion method during comparisons under laboratory condition, and can be further extended to various applications for in-situ measurement of the response time of RTD in nuclear power plants under different installation conditions.

关 键 词：电阻温度计 原位法 LCSR 响应时间 浸入法 

分 类 号：TH81[机械工程—仪器科学与技术] TP216[机械工程—精密仪器及机械]