lab07-02-NGOC[1] - Drexel University Electrical and...

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Unformatted text preview: Drexel University Electrical and Computer Engineering Department Electrical Engineering Laboratory 2, ECE-L302 Lab 7 Measuring AC Electric Power Student Name: KACEY HOANG (12039169) Section: 062 Instructor: Dr. Chirstopher Peter Experiment Date: 03/02/ 2012 Due Date: 03/09/ 2012 Table of Content Abstract Page 3 Introduction Page 4 Theory Page 5 Procedure Page 6 1 Results Page 7 Conclusions Page 30 Works Cited Page 30 Appexdix Page 31 Abstract 2 Introduction The goal of this experiment was to learn about the AC circuit through the main components influenced voltage and current. Magnitude and phase of current and voltage played an important role in this lab experiment because they affected directly to the real power, reactive power and the power factor. By adding the resistive loads, inductive loads and capacitive loads to the circuit, it was obviously to prove their characteristic by going through the experiment. The group had seen the voltage and current of resistive loads were in phase while they were out of phase in inductive and conductive load. Voltage lagged current in conductive load since voltage leaded current in inductive load. Power factor was the ratio of real power and apparent power. In order to improve the power factor, the group added more capacitors to the original circuits of 20 light bulbs and 2 inductors. By doing so, the power factor was improved from 0.80 to 0.99, which was pretty close to 1. The power factor would be lagged with inductive loads and it would be leaded with capacitor loads. The differences in phase of the voltage and current were not exactly equal to 0 o for resistors or 90 o for inductor and capacitor due to the non-ideal AC supply and non-ideal circuit. 3 Theory There is several type of power such as instantaneous, real or average and reactive power; however they all have dimension in Watt (W). The instantaneous power is the product of the time function of the voltage and current. This is valid for signal of any waveform. P (t) =v (t)*i (t) (1) In an AC waveform, the average of the oscillating term is zero. P=1/2*Vm*Im*cos() (2) P=|V|*|I|*cos()(1-cos(2wt))- |V|*|I|*sin()*sin(2wt) (3) The second term of the equation is an oscillation of the wave with a zero average value. The reactive power, which is the second term of equation 3, will reach its maximum value at the angle of 90 degrees [1]. The real power can be calculated by () (4) where V rms and I rms are the rms values of the voltage and current which have: |V|= Vm/sqrt(2) and |I|=Im/sqrt(2) The reactive power can be calculated by sin() (5) Procedure Students were experienced with new laboratory tools in this lab so a short description about safety was provided in the beginning of the lab. The system of the new equipment was instructed in Fig.1A....
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This note was uploaded on 03/14/2012 for the course ELECTRICAL ECEL taught by Professor Yh during the Spring '12 term at Drexel.

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lab07-02-NGOC[1] - Drexel University Electrical and...

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