Method for improving measuring precision of thermal resistance thermometer

A thermal resistance thermometer and measurement accuracy technology, which is applied in the field of nuclear power plant measurement, can solve problems such as the inability to reduce the deviation of the thermometer, achieve the effects of improving safety and economy, reducing errors, and improving measurement accuracy

Active Publication Date: 2014-06-11
NUCLEAR POWER INSTITUTE OF CHINA
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Problems solved by technology

[0005] With the wide application of digital technology, for example, domestic nuclear power plants such as Ling'ao Phase II, Hongyanhe, Ningde, Yangjiang, Fuqing, and Fangjiashan have adopted a fully digital DCS instrument and control platform, which is used to collect on-site temper

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  • Method for improving measuring precision of thermal resistance thermometer
  • Method for improving measuring precision of thermal resistance thermometer
  • Method for improving measuring precision of thermal resistance thermometer

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Embodiment Construction

[0021] A method for improving the measurement accuracy of a thermal resistance thermometer of the present invention includes the following steps:

[0022] Step 1. Select m points within the measurement range of a resistance thermometer as temperature calibration reference points, where the output temperature value of the nth reference point is Y n , N=1,2,3,…,m;

[0023] Step 2: Each resistance thermometer is attached with a data sheet when it leaves the factory, and the resistance value R of the nth temperature calibration reference point is collected according to the data sheet of the resistance thermometer. n ;

[0024] Step 3: According to the resistance value R of the nth temperature calibration reference point collected in step 2 n , And then obtain the input temperature value X corresponding to the nth temperature calibration reference point by the following formula n ;

[0025] R n =R 0 (1+AX n +BX n 2 );

[0026] Where R 0 =100Ω, when according to IEC6075 standard, A=3.9083×10 ...

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Abstract

The invention relates to and particularly discloses a method for improving measuring precision of a thermal resistance thermometer. The method comprises the following steps that 1, m points are selected within the measuring range of one thermal resistance thermometer as temperature correction datum points, and the output temperature value of the nth datum point is Yn; 2, the resistance value Rn of the nth temperature correction datum point is collected according to the data table of the thermal resistance thermometer; 3, an input temperature value Xn corresponding to the nth temperature correction datum point is acquired; 4, m-1 temperature intervals are formed by the m temperature correction datum points, and when a temperature value Ti measured by the thermal resistance thermometer is within the ith temperature interval, the gain Ai and polarization Bi of the ith temperature interval are obtained according to the step 3; 5, the temperature value Ti measured by the thermal resistance thermometer is calibrated and corrected, and a calibrated and corrected temperature value Ti' is obtained. According to the method, the measuring precision of the thermal resistance thermometer of a nuclear power plant is improved, the error of a whole temperature measuring channel is lowered, and the safety and economical efficiency of the power plant are improved.

Description

technical field [0001] The invention belongs to the field of nuclear power plant measurement, and in particular relates to a method for improving the measurement accuracy of thermal resistance thermometers in nuclear power plants. Background technique [0002] The temperature signal is a key monitoring parameter of the entire nuclear power plant. It plays an important role in the status monitoring and control of the process system and equipment. Many temperature signals are used for equipment shutdown and reactor protection shutdown. It is necessary for operators to operate safely and effectively. Information, accurate measurement of temperature signals is an important guarantee for the safe, reliable and economical operation of nuclear power plants. Therefore, it is very necessary to improve the measurement accuracy of the thermometer. [0003] At present, the RTD thermal resistance PT100 thermometer is widely used in domestic nuclear power plants, and its manufacturing ba...

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Application Information

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IPC IPC(8): G01K7/16G01K15/00
Inventor 霍雨佳李小芬李红霞何正熙朱加良陈静余俊辉何鹏苟拓刘艳阳李文平王远兵王华金
Owner NUCLEAR POWER INSTITUTE OF CHINA
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