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| Composite Measurement Error Analysis and Model Research of Electrical Signals RMS |
| Hu Huabo1, Wu Jianwen1, Zhang Luming2, Lian Shijun2 |
| 1. Beijing University of Aeronautics and Astronautics Beijing 100083 China 2. Zhuhai Keli Electric Group Ltd Zhuhai 519015 China |
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Abstract The total error of the system can be reduced effectively by a reasonable distribution proportion of the error sources when the electrical signal measurement system was designed. The effect of the signal frequency change, the signal measurement range, the transducer precision, the A/D precision, and the data shifting were analyzed in this paper. Moreover, an integrated measurement error of electrical signals RMS(root-mean-square) mathematical model was deduced, and the error model was verified by the calculation results. Meanwhile, the error model was applied to the relay protection prototype. 1A low current with the measurement error low then 0.4% and 5A (or above) current with the measurement error low then 0.2% were achieved in this paper. The model of error calculation provides the basis for the best design of Error distribution on measurement system.
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Received: 27 September 2011
Published: 20 March 2014
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2012, Vol. 27 
