.Spot.ACabc.Sensors

Information

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

Contents

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