A Simple Scheme for Measurement of Power Frequency Deviation
Arshi Salamat
Arshi Salamat, Department of Electrical Engineering Section, University Polytechnic Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi, India.
Manuscript received on January 20, 2013. | Revised Manuscript received on February 15, 2013. | Manuscript published on February 28, 2013. | PP: 665-668 | Volume-2 Issue-3, February 2013.  | Retrieval Number: A4755106116/2013©BEIESP

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Abstract: Measurement of power frequency deviation is important for the design of power system equipments such as stabilizers, frequency meters etc. This paper has suggested a monitoring scheme using a 90 0 phase shifter. The use of phase shifter makes it easier to compare the two frequencies, the nominal and deviated frequency. The shifted and normal frequency signals are combined through EX-OR gate. If the power frequency differs from its nominal value, a difference in the pulse counts of two successive pulses occur which will be proportional to amount of deviated frequency. This method has advantage of providing high resolution. Also it is very simple and less expensive as compare to other methods. The scheme is implemented using 8085 microprocessor.
Keywords: Zero Crossing Detector, Deviation, Phase shifter, Resolution.