METHOD FOR DETERMINING PHASE SHIFT ANGLE BETWEEN SINE SIGNALS (VERSIONS) Russian patent published in 2015 - IPC G01R23/00 

FIELD: electricity.

SUBSTANCE: method for determining a phase shift angle between two sine signals by measurement of N/2 times during half-period T/2 and at every current point of time t_j, j = 1, 2, …, N/2 of an instantaneous value of one of two sine signals a(t_j), which varies in time t as per the following relationship: a(t) = A_msin(ωt). At occurrence of moment of fulfilment of the condition, at which instantaneous value a(t_j)=0, performance of measurement and fixing of an instantaneous value of another sine signal - b(t_j)|_a=0 of the same frequency, which varies in time t as per the following relationship: b(t) = B_msin(ωt+φ). Phase shift angle value φ is determined: φ = arc sin(b(t_j)|_a=0/B_m), where φ is phase shift angle between two sine signals a(t) and b(t); b(t_j)|_a=0 is value of sine signal b(t) during one half-period T/2 at point of time t_j, when value of sine signal a(t) is equal to zero, signal measurement units b(t); B_m is amplitude value of sine signal b(t), signal measurement units b(t), which is taken with a plus sign if b(t_j)>b(t_j-1), where b(t_j-1) is previous instantaneous value of sine signal b(t), which is measured at point of time t_j-1, and with a minus sign if b(t_j)<b(t_j-1).

EFFECT: improving quick action and accuracy of determination of phase shift.

4 cl, 3 tbl