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Vol. 119, Issue 8, August 2010, pp.82-90




A Modified Technique of Active Power Measurement for Industrial Frequency Applications


Satish Chandra BERA and Dhritinandan KOLE

Instrumentation Engineering Section, Department of Applied Physics,

University of Calcutta, 92 A.P.C. Road, Kolkata 700009 India

E-mail: scb152@indiatimes.com, dnkoley@yahoo.com



Received: 15 March 2010   /Accepted: 17 August 2010   /Published: 31 August 2010


Abstract: Measurement of electric power and energy is very important aspect in any electrical application. A very simple design of measurement of active power for industrial frequency application is described in the paper. In this design a light emitting diode and light dependent resistor based electronic circuit has been fabricated to measure active power in terms of the DC output voltage of the circuit. Theoretical equations have been derived to find a linear relation between the DC output voltage and input power. The whole unit has been designed, fabricated and experimentally tested. The experimental results are reported in the paper and are found to follow the theoretical equations. It has been observed that the analog DC output voltage of the proposed circuit is linearly related with the power within tolerable limit.


Keywords: Current/potential transformer, Active power, Wattmeter, LED-LDR, Electronic multiplier


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