Allen-Bradley 1420-V1, Руководство пользователя, Страница: 74 / 90

74 Rockwell Automation Publication 1420-UM001E-EN-P - March 2016
Appendix B Technical Specifications
Figure 27 - Calculation Formulas
System variables
Equivalent three-phase voltage
Three-phase real power
Three-phase reactive power
Three-phase apparent power
Phase variables
Instantaneous effective voltage
Instantaneous real power
Instantaneous power factor
Instantaneous effective current
Instantaneous apparent power
Instantaneous reactive power
Energy metering
Where:
i= considered phase (L1, L2 or L3)
P = real power; Q = reactive power;
t
1
, t
2
=starting and ending time points
of consumption recording; n = time
unit; Δ t = time interval between two
successive power consumptions;
n
1
, n
2
= starting and ending discrete
time points of consumption recording
Three-phase power factor
(TPF)