Satec Expertmeter EM720 Operation Manual page 111

Chapter 5 Configuring the EM720
EM720 Power Quality and Revenue Meter
4. Disabling recording events to the PQ log does not
prevent the evaluation of the voltage characteristics
and collecting the EN50160 statistics for these
events.
5. Select the waveform logging options for PQ events.
If you have the EM720T, then one-cycle duration
transient waveforms are automatically recorded to
Waveform log #3 at a rate of 1024-samples/cycle.
If you selected a conventional waveform log file for
transient overvoltages, the recorder will also record
a longer waveform at a lower rate specified for this
file, synchronized with the fast transient waveform.
6. Download your setup to the device.
The picture above shows the default PQ recorder settings.
The available options are listed in the following table.
Option Range
Threshold, % 0-200.0%
Hysteresis, % 0-50.0%
Enabled Checked
Unchecked
On Start Checked
Unchecked
On End Checked
Unchecked
Log No. 1-2
The waveform log options allow recording waveforms both
at the start and the end of a PQ event. Since the voltage
variations can last from some seconds to minutes, this
allows capturing and analyzing the voltage transitions
using short time waveform recording at the start and at
the end of the voltage dip or overvoltage.
You can temporary disable the PQ recorder in your device.
To enable or disable the PQ recorder:
1. Check or uncheck the Recorder Enabled checkbox.
2. Send your setting to the device.
Note that disabling the PQ recorder in your meter does not
affect the evaluation and recording of the EN50160
statistics.
Indication of the Power Quality Events
When the PQ recorder detects a power quality fault, it
generates the specific internal event "PQ EVENT" that can
be monitored through a control setpoint. The event is
Configuring the EN50160 Recorders
Default
PQ Log
Defines the operating threshold for the PQ
trigger in percent of the nominal
(reference) value
5.0 Defines the hysteresis for the PQ trigger in
percent of the threshold
Enables recording PQ events for specific
voltage characteristics
Waveform Log
Checked Enables waveform log when the PQ event
starts
Unchecked Enables waveform log when the PQ event
ends
Specifies the waveform log file used for
waveform recording on the PQ event
Description
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