| 摘要 |
FIELD: electricity.SUBSTANCE: method for determining phase angle between two sinusoidal signals by measuring, recording and digitalizing of instantaneous values a(t) of signals a(t) = Asin(?t+?) and b(t) = B·sin(?t+?) at the same moments of time t= t, t, ?, t, where N is number of measurements within period T. At that t= t+?t, where ?t = T/N is discretization interval of the signal in time. At that at each measurement of signals a(t) and b(t) values of signals received two intervals back a(t), b(t), j = 3, 4, ?, N+2 are selected, the current value R= a(t)-a(t) of signal a(t) is calculated and recorded, the current value S= b(t)+b(t) of signal b(t) is calculated and recorded, while the value ?of angle difference between signals a(t) and b(t) are defined upon measurement, recording and digitalization of all N instantaneous values as per the following mathematical expression ?= arqsin(?RS/(4?AB)), where summing is made as per j = 3, ?, N+2, R= a(t)-a(t); S= b(t)+b(t).EFFECT: simplified method for defining angle difference.2 cl, 3 tbl |
