SATEC PM174 Manual - Manual (Page 96)

Chapter 4 PAS Application Configuring Recorders
96 Series PM174 Powermeters
7. Select the number of cycles to be recorded prior to the event,
and a total number of cycles in the waveform.
8. Add the name for your waveform log file in the “Name” box. It will
appear in the waveform reports.
9. Save your waveform setup to the device database, and send it to
the meter.
Configuring the IEEE 1159 Power Quality
Recorder
The Power Quality (PQ) recorder identifies the IEEE 1159
power quality events and records them to the log file with
precise start and end timestamps and a fault magnitude. The
IEEE 1159 PQ data can be retrieved from the device, stored
on a PC and displayed on the screen as shown in Section
“Viewing the IEEE 1159 Power Quality Log”. Impulsive
transients and short-duration voltage variations (sags and
swells) can also be viewed as magnitude/duration pairs on the
well-known ITIC curve chart for assessing the minimum
equipment immunity.
The PQ recorder is programmable to trigger the waveform
recorder to record the fault waveforms before, during and after
the PQ event for detailed event analysis. It may be useful for
trouble-shooting problems throughout electrical networks, for
example, to identify and locate the source of a power quality
event and to select an appropriate solution.
PQ Events Evaluation
The events are classified in accordance with the IEEE 1159
power quality categories. The table below shows the
categories recorded by the meter, the metering data used to
detect voltage and frequency faults, their typical triggering
thresholds and event durations.
Impulsive transients. Impulsive transients are detected as
impulses with a rise time less than 0.5 ms and duration from
150 us to ½ cycle. The impulse magnitude is measured as the
overshoot voltage magnitude above the normal voltage
waveshape. It is referenced to the nominal peak voltage
(1.414 Un).
Sags and swells. A voltage sag or swell is classified as one
polyphase event regardless of the shape and of the number of
phases affected (as per IEC 61000-4-30). An event can begin
on one phase and end on another phase. The fault magnitude
is recorded separately for each phase involved. The event
duration is measured from the instant at which the voltage
falls/rises below/above the start threshold on one of the
phases to that at which it becomes greater/lower than the end
threshold on all affected phases including a threshold
hysteresis.
Voltage Interruptions. The voltage interruption is detected
when the voltages on all phases fall below the interruption
threshold (as per IEC 61000-4-30).
Flicker. The flicker is evaluated according to IEC 61000-4-15.
The 10-min Pst values are used to follow and indicate the
flicker faults.
Event
ID IEEE 1159 category Trigger parameter Reference
value
Typical
thresholds, % Event
duration
PQE11 Impulsive transients Instantaneous
overshoot voltage
Un peak
voltage 20-200% 150 us–10 ms
PQE211 Instantaneous sag ½ cycle RMS voltage Un RMS 80-90% < 30 cycles