Active Factor And Power Factor; Neutral Current In - Siemens Simatic ET 200SP Manual

Power quality analysis functions

11.5 Active factor and power factor

11.5 Active factor and power factor
The AI Energy Meter HF returns the active and power factor individually for each phase and
as an aggregate.
Active factor
The active factor is defined as follows:
cos φ (active factor, signed, fundamental oscillation): cos φ = P1 / S1
φ = phase shift angle of fundamental oscillation
P1 = active power of fundamental oscillation
S1 = apparent power of fundamental oscillation
Power factor
The power factor λ = cos Φ is the ratio of active power (P) to the total apparent power (S)
over the fundamental oscillation and all harmonics (total):
λ (power factor, unsigned, total): λ = cos Φ = |P| / S
11.6

Neutral current In

The module can measure or calculate the neutral current.
For measuring, you have to connect a current transformer to neutral. The behavior
"measuring or calculating" can be set for each parameter. The main application of the
measured value "Neutral current IN" (ID: 61149) are three-phase networks with existing 4th
conductor, neutral: The neutral current usually shows incorrectly flowing currents. In an ideal
three-phase network, the neutral current = 0.
An additional possible application is measuring any 4th current on this channel. Please note
that in this case the measured value "Neutral current" displays this 4th current and not the
actual neutral current.
Additional values in conjunction with the neutral current is set to 0.
The calculation of the neutral current and the comparison of calculated and measured
neutral current (used for residual current analysis) is only possible in the operating modes
"3P4W" and "3P4WI".
The determination of the neutral current is not subject to current suppression.
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Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
Manual, 07/2018, A5E42674880-AA