Measuring Accurately Single-Phase Sinusoidal and Non-Sinusoidal Power

摘要

The resulting effect of a significant increase in non-sinusoidal signals on power systems and equipment due to the application of new power electronic devices is a question yet to be answered. A subquestion in trying to determine the effects of non-sisinusoidal signals on power systems and equipment is how to accurately measure these signals. This thesis makes an attempt to answer not only the question of how to measure accurately single-phase sinusoidal and non-sinusoidal power but also the question of which types of power and energy meters are most accurate and are less affected by these non-sinusoidal power variations. This thesis compares the accuracy of various power measurements using two General Electric Type P-3 Electrodynamometer wattmeters, two Clarke-Hess Model 255 Digital Wattmeters and one General Electric Type VM-63-S Induction Watthour Meter. The experimental setup used to test the accuracy of the power and energy meters consisted of using a standard 120 V, 60 Hz single- phase source which feeds the power and energy meters. The power and energy meters were connected to the specific test source (either ac, half-wave rectified, or bidirectional thyristor-controlled) which was connected to the test load (high power-factor load, R-L load, or R-C load).