Reactive Power Compensation; Detection Of Residual Current - Siemens Simatic ET 200SP Manual

11.3

Reactive power compensation

Use the power factor of the fundamental for the reactive power compensation.
When you activate the power quality analysis function, the power factor of the fundamental is
available in the measured value data record DS 160 (Page 259) or in the user data.
See also
User data variants (Page 205)
11.4

Detection of residual current

For the residual current analysis (function "Tamper Detect" = Detection of unauthorized
interventions), the total current must be determined:
Isum L1L2L3 (t) = IL1 (t) + IL2 (t) + IL3 (t)
The instantaneous residual current If is obtained by subtracting the results of the current
neutral current In from the total current:
If = Isum L1L2L3 – In
Analysis starts immediately after parameter assignment. The measured value "Total current
IL1+IL2+IL3-IN" (ID = 61153) returns the residual current. It is contained in DS 160, for
example. You can monitor a threshold relevant for your application for a limit value (see
function Limit monitoring (Page 77)).
Requirements
● "3P4W" or "3P4WI" is parameterized as the connection type.
● The same current transformers are connected to all three phases.
● The parameter "Reverse current direction" is parameterized identically for all three
phases.
● The neutral current is parameterized with "Measuring".
● The residual current analysis is activated in the parameter assignment.
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
Manual, 07/2018, A5E42674880-AA
Power quality analysis functions
11.3 Reactive power compensation
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