Sensors output terminal signals (voltage, current, power) in a defined reference system chosen by the user.
Meters allow choosing base-units for output variables.
Comment on the sign-definition of reactive power:
From a mathematical point of view, it would be desirable to define power in the following way:
p_active = v*i p_reactive = (J*v)*i
with
J = [0,-1,1; 1,0,-1; -1,1,0]/sqrt(3)
the rotation of pi/2 in the positive sense.
This definition keeps all coordinate systems positively oriented. The power-vector then can be interpreted as current-vector, normalised by voltage and transformed into a positively oriented coordinate system, whose first axis is given by the voltage vector v, and second axis by J*v.
From a practical point of view it is more convenient to use the inverse sign for reactive power, in order to obtain positive reactive power in the standard-situation of power-transfer across an inductive line. We adapt the sign-definition to this practical convention:
p_reactive = -(J*v)*i
| Name | Description |
|---|---|
| VnormSensor | Voltage-norm sensor, 3-phase abc |
| InormSensor | Current-norm sensor, 3-phase abc |
| Vsensor | Voltage sensor, 3-phase abc |
| Isensor | Current sensor, 3-phase abc |
| Psensor | Power sensor, 3-phase abc |
| Vmeter | Voltage meter, 3-phase abc |
| Imeter | Current meter, 3-phase abc |
| Pmeter | Power meter, 3-phase abc |
| PVImeter | Power-voltage-current meter, 3-phase abc |
| Efficiency | Power sensor, 3-phase dqo |
| Phasor | Visualiser of voltage and current phasor, 3-phase abc |
| Partials | Partial models |