Research and Application of AP1000 Class 1E RTD Channel Calibration Method
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摘要: 为优化核电厂核级电阻温度探测器（RTD）通道校准方法，以满足电厂仪表精度要求，从RTD测量原理与核电厂常用RTD通道校准方法入手，详细阐述了核级RTD在安装、更换、运行试验中可能用到的校准修正方法，提出了结合模拟/数字（A/D）转换器精度的RTD通道校准方法，给出了结合工艺系统温度平台RTD交叉校准数据在RTD通道校准中的应用方式。经分析计算和应用验证，该RTD通道校准方法可以有效提高仪表通道精度，具有很强的实用价值。
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关键词:
- 核级电阻温度探测器（RTD） /
- 通道校准 /
- 参数调整 /
- AP1000
Abstract: To optimize the accuracy calibration method of Class 1E RTD channel in the nuclear power plant to meet the accuracy requirements of power plant instrument, this paper begins with the measurement principle of RTD and the common channel calibration methods in the nuclear power plant, elaborates the calibration and correction methods that may be used in the installation, replacement and operation test for Class 1E RTDs, puts forward a calibration correction method for RTD channels incorporating the accuracy of analog-to-digital (A/D) converters, and gives the application mode of cross-calibration data from RTDs in process system temperature platforms for RTD channel calibration. Through analysis, calculation and application verification, this RTD channel calibration accuracy correction method can effectively improve instrument channel accuracy and demonstrates strong practical value.-
Key words:
- Class 1E RTD /
- Channel calibration /
- Parameter adjustment /
- AP1000
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图 1 典型RTD回路连接图
“I+”—电流源正极；“I−”—电流源负极；“V+”—RTD两端电压正极；“V−”—RTD两端电压负极。
Figure 1. Typical Connection Diagram of the RTD Circuit
表 1 理想情况下RTD测量元件的电阻与温度特性
Table 1. Ideal Resistance-Temperature Characteristic for RTD Element
序号 电阻/Ω 温度/℃ 1 100.00 0 2 119.40 50 3 138.51 100 4 157.33 150 5 175.86 200 6 212.05 300 7 229.72 350 8 247.09 400 
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表 2 核级RTD检定温度和修正后数据 ℃
Table 2. Calibration Temperature and Corrected Values of Class 1E RTD
检定行程 检定温度 检定RTD
温度偏差检定RTD
显示温度修正后
温度偏差温度上升与
下降循环0 −0.101 −0.101 −0.0516 100 −0.069 99.931 −0.0897 182 0.019 182.019 −0.0591 260 0.056 260.056 −0.0767 290 0.083 290.083 −0.0708 330 0.099 330.099 −0.0828 290 0.158 290.158 0.0042 260 0.207 260.207 0.0742 182 0.262 182.262 0.1837 100 0.173 100.173 0.1522 0 −0.106 −0.106 −0.0566
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表 3 结合A/D转换器精度的核级RTD整体通道校准与修正数据 ℃
Table 3. Calibration and Correction Data of Class 1E RTD Incorporating A/D Accuracy
序号 检定温度 检定RTD温度偏差 A/D转换器精度偏差 检定RTD整体通道温度偏差 修正后RTD整体通道温度偏差 1 0 −0.101 0.2183 0.1173 −0.0517 2 100 −0.069 0.2183 0.1493 −0.0897 3 182 0.019 0.2183 0.2373 −0.0592 4 260 0.056 0.2183 0.2743 −0.0768 5 290 0.083 0.2183 0.3013 −0.0708 6 330 0.099 0.2183 0.3173 −0.0828 7 290 0.158 0.2183 0.3763 0.0041 8 260 0.207 0.2183 0.4253 0.0741 9 182 0.262 0.2183 0.4803 0.1837 10 100 0.173 0.2183 0.3913 0.1521 11 0 −0.106 0.2183 0.1123 −0.0567
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表 4 某AP1000核电厂RCS系统不同温度平台数据与修正情况 ℃
Table 4. Data and Correction for Different Temperature Platforms of the RCS System in a Certain AP1000 Nuclear Power Plant
序号 一回路温度 RTD采集温度 环路温度中间值 修正前温度偏差 修正公式后温度 修正后温度偏差 1 147.0 147.082 147.271 −0.189 147.275 0.004 2 176.5 176.548 176.749 −0.202 176.748 0.001 3 231.0 231.135 231.400 −0.265 231.377 −0.023 4 292.0 291.997 292.262 −0.266 292.272 0.010
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