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《Power System Technology》 2002-01
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ANALYSIS ON ERROR IN POWER SYSYTEM FREQUENCY MEASUREMENT

XIAO Yao 1, MAUN Jean Claude 2 (1. Hubei Electric Power Testing & Research Institute, Wuhan 430077, Hubei Province, China; 2.Univesité Libre de Bruxelles,B 1050,BRUXELLES, Belgium)  
Power system frequency is one of the most important indexes of power quality and higher frequency measurement accuracy is needed by a great deal of applied technologies. At present the novel methods for accurate frequency measurement are often published in technical periodicals, but it seems as if these methods lay special emphasis on the distortion of waveform. In this paper by means of theoretical analysis and tests the basic reason causing the measurement error of frequency is revealed, that is when the output of generator, loads or the structure of power system vary, the initial phase of the measured voltage signal is suddenly changed, thus the measurement error occurs.
【CateGory Index】: TM935.1
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