Apparent power measurement

In real networks, not all consumers are purely ohmic. Phase shifts occur between current and voltage. This does not affect the methodology for determining the rms values of voltage and current as described above.

The situation for the effective power is different: Here, the product of effective voltage and effective current is the apparent power.

Apparent power measurement 1:

The effective power is smaller than the apparent power.

Apparent power measurement 2:

S: Apparent power
P: Active power
Q: Reactive power
φ: Phase shift angle

Apparent power measurement 3: — u_(t), i_(t), p_(t) curves with phase shift angle φ

In this context, further parameters of the mains system and its consumers are significant:

apparent power S
reactive power Q
power factor cos φ

The EL34x3 determines the following values:

effective power P
effective voltage U
effective current I
apparent power S
reactive power Q
power factor cos φ
harmonic
phase shift λ