167 results about "Reactive power theory" patented technology

The invention discloses an intelligent electric power parameter tester, which comprises a zero-crossing comparison circuit, a phase locking synchronous circuit, a signal conditioning circuit, an A/D conversion module, a control module, a power supply, an input module, a data display module and a USB interface module. Multiple electric power parameters are measured by adopting a DSP digital processing chip, and the intelligent electric power parameter tester has the unique advantages in aspects of improvement on measurement accuracy, real-time digital signal processing and intellectualization. In the intelligent electric power parameter tester, voltage and current at the same phase are respectively used as a real part and an imaginary part of a complex sequence to perform Fourier transform, and the intelligent electric power parameter tester has the maximal advantage that various electric power parameters (voltage effective values, current effective values, frequency, harmonic waves, power factors, active power, reactive power and the like) in a power grid can be solved simultaneously by only one-time the Fourier transform of the complex sequence, so the calculated amount is reduced, and the real-time and accuracy of measurement are improved. The intelligent electric power parameter tester can be widely applied in occasions such as electric power departments, industrial and mining enterprises and the like where the multiple parameters of an electric power system are needed to be measured automatically.