Power Quality Analysis Functions - Siemens Simatic ET 200SP Manual

Power quality analysis functions

Introduction
Power quality analysis functions are used as an aid to evaluate the quality of the supply
network. In a three-phase system, many of these functions only make sense or can be
executed if a functioning symmetrical three-phase supply system is available, the detection
sensors of the three phases are identical in design and the nominal values current or voltage
of the phases have the same values.
The AI Energy Meter HF provides you with the following power quality analysis functions in
accordance with IEC 6100-4-30 for monitoring the power quality in your power network:
● Measure the neutral current
● Perform residual current analysis
● Determine active and power factor
● Carry out reactive power compensation
● Analyze fundamental values three-phase (voltage, current, power)
● Analyze the harmonics up to the 40th harmonic
● Determine the total harmonic distortion THD+N current/voltage for all three phases
● Detect voltage dip and voltage swell
● Detect overcurrent
● Detect peak value for current and voltage
The power quality analysis only returns useful results if some basic requirements are met.
These include:
● Accuracy of the line frequency (50 Hz or 60 Hz) is maintained according to IEC 61557-12.
● Wiring has been carried out correctly.
Delete the results of the power quality analysis
Delete the results of the power quality analysis by setting the corresponding bits in Byte 12
of the output range (Page 200) for at least 100 ms to "1".
Deletion has the following effects:
● Deletion of the result values and status bits for
– Peak values of the instantaneous values for voltage and current
– Overcurrent of the current half value
– Voltage dip and voltage swell of the voltage half-wave value
● Any pending diagnostics "External fault" is deleted.
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Analog input module AI Energy Meter 480VAC/CT HF (6ES7134-6PA00-0CU0)
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Manual, 07/2018, A5E42674880-AA