Peak Values Of The Instantaneous Values For Current - Siemens Simatic ET 200SP Manual

The following table shows the parameter assignment for the example:
Table 14- 17 Parameter assignment
Parameter
Nominal value current
Current transformer primary current
Current transformer secondary current
Low limit for current measurement
In this example you define the "Low limit for measuring current" with 10%. This corresponds
to an effective value of the primary voltage of 200 A.
If the value falls below the calculated low limit for current measurement, the module sets all
current-dependent measured values (effective value current, active power, reactive power,
apparent power, phase angle and power factor) to 0 A until the low limit for measuring
current is exceeded again. The energy meters and operating hours counters are stopped
during this time.
14.4.2.3

Peak values of the instantaneous values for current

Introduction
The AI Energy Meter HF determines the maximum instantaneous value for the current for up
to three phases.
The function "Detect peak value current" returns the largest current value and the associated
phase. The module sets the qualifier bit 3 ("Power quality current peak") for the phase in
question. You can read the maximum current value, for example, in the data record DS 160
(Page 259).
Current peak detection is based on the function for recording swells of the supply voltage in
accordance with IEC 61000-4-30. This function is used to record the maximum current value
in the supply network. In three-phase systems this function is only useful if current recording
is symmetrical and if all phases show the same current transformers.
Accordingly, measurement always records only the peak value over all phases. In addition to
the requirements of IEC 61000-4-30, the phase on which the peak value current occurred is
detected.
For metrological reasons, only the phase concerned that shows this maximum value can be
returned. This may mean that the maximum current values of the other phases remain "0".
With a "reset power quality analysis" the analysis starts afresh and the current results are
discarded.
Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
Manual, 07/2018, A5E42674880-AA
2000 A
5000 A
5 A
10%
Interrupts/diagnostic alarms
14.4 Diagnostics response
127