Oleh
Liew Wei San
Sekolah Menengah Kebangsaan Pahi
Abstract :
For this project, main objective is to apply amplitude and projection of sinusoidal graph in alternating current and thus determine the phase differences between cosine and sine waveform. The application of phasor diagram is increasing the reliability of the power grid by detecting faults early, allowing for isolation of operative system, and the prevention of power outages. This concept came from Charles Proteus Steinmetz in 1893 due to its first presentation of handwriting of simplified mathematical description of the waveforms of alternating current electricity and that brings the invention of phasor measurement units (PMU) in 1988 by Dr. Arun G. Phadke and Dr. James S. Thorp. Based on analysis, there should be a phase difference between voltage and current in an alternating circuit to turn negative feedback into positive feedback and turn an amplifier into an oscillator . When there is phase difference, the current is said to "lag" the voltage by 90degrees (for a sin stimulus). Conversely, the non-existing ‘’lag’’ may lead to a power outages if being neglected. In conclusion, phase difference between cosine and sine graph = 90 ͦ. Thus, cos ωt = sin (90- ωt) and sin ωt = cos (90- ωt) .
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