E-Mon E-PS-S-HV-RTU - Manual (Page 22)

Chapter 2 Operating the
PowerSmart Socket PQM Instrumentation Metering
22 PowerSmart Socket Power Quality Meter
• 15-min energy load profile for 120 days or 30-min profile for
240 days.
Maximum demand profiling for monthly and daily billing data
profiles can be individually configured for every register.
See Factory Preset Data Log Files in Chapter 5 and Billing and
Load Profile Log Files in Appendix D for more information on
the file layout and contents.
Billing Data Display
The PowerSmart Socket PQM display indicates billing energy,
maximum demand and cumulative maximum demand
registers for the present billing period and for three previous
billing periods.
The display is automatically configured for your set of billing
registers and your tariff schedule. See
Billing Period Data
Displays in Chapter 3 for the display layout.
Instrumentation Metering
Instrumentation metering provides real-time measurements
and time-integration for local and remote power monitoring
and control, and a source for power quality evaluation and
triggering the logical controller and Fault recorder.
See Parameters for Monitoring and Logging in Appendix A for
a full list of the electricity and status measurements provided
by the PowerSmart Socket PQM.
All RMS quantities are based on 1/2-cycle true RMS
measurements as per IEC 61000-4-30.
Voltage and current harmonic measurements are based on
10-cycle/50Hz
or 12-cycle/60Hz waveforms (per
IEC 61000-4-7), sampled at a rate of 128 samples/cycle. The
PowerSmart Socket PQM uses dynamic sampling techniques
to maintain a steady sampling rate and avoid instrumentation
errors when the line frequency changes.
The meter provides short and long term flicker
measurements as per IEC 61000-4-15.
The following table shows time-aggregation intervals
available for different RMS and power quantities.
Parameter 1/2
cycle
1
cycle
200 ms 1
sec
3 sec 10
sec
10
min
2
hours
RMS volts Ч Ч Ч Ч Ч Ч Ч
RMS currents Ч Ч Ч Ч 1 Ч Ч Ч
Powers Ч 3 Ч 1
Zero-sequence Ч Ч Ч Ч Ч Ч Ч
Unbalance Ч Ч Ч Ч Ч Ч
Frequency Ч Ч Ч Ч Ч
Total harmonics Ч Ч Ч Ч Ч
Total interharmonics Ч Ч Ч
Individual harmonics Ч Ч 2
Individual interharmonics Ч Ч 2
K-factor Ч Ч Ч Ч Ч