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《Automation of Electric Power Systems》 1987-06
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A NEW METHOD OF MEASURING FREQUENCY FOR RELAY AUTOMATIC DEVICES

Hu Yanting, Li Benfan (Northeast China Institute of Electric Power Engineering)  
Real-time measurement of frequency is necessary for monitoring and control of power systems.This paper presents a new method for raising accuracy of frequency calculation by introducing a correction function into level crossing algorithm based linear interpolation.Two algorithms and formulae are given.Simulation test showed the method is highly accurate, expeditious and suitable for real-time measurement of frequency.
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