Owner manual

Chapter 2 Operating the
PowerSmart Socket PQM
Billing and Energy Metering
20 PowerSmart Socket Power Quality Meter
• kWh net (Q1+Q4)-(Q2+Q3) - instrumentation
• kvarh delivered (Q1+Q2)
• kvarh received (Q3+Q4)
• kvarh net (Q1+Q2)-(Q3+Q4) - instrumentation
• kvarh Q1, Q2, Q3, Q4 quadrants
• kVAh delivered (Q1+Q4)
• kVAh received (Q2+Q3)
• kVAh total (Q1+Q2+Q3+Q4)
Energy Measurement Channels
The PowerSmart Socket PQM uses two independent current
channels for high-accuracy energy measurements and for
conventional high-range instrumentation. They provide
different gain and measurement ranges as necessary for
billing accuracy energy metering and for power quality and
fault monitoring.
1-second currents and powers provided by the meter and the
corresponding engineering display readings are taken from
the energy measurement channel. They begin measurements
from 5 mA starting currents and up to 20 A RMS with 5 A
secondaries, while instrumentation currents provide
measurements up to 50 A RMS.
Energy Counters
The PowerSmart Socket PQM provides instrumentation
energy and billing energy metering. Both use the same
energy measurement circuitry as a source input for
accumulation energies but operate independently.
Energy counters have a nine-digit kWh resolution with one
decimal place by default. You can set the energy counters to
have fewer digits by changing the default energy roll value in
your meter (see Device Options and Mode Control in Chapter
5).
Billing energy registers have the same resolution as
instrumentation energy counters.
Billing Energy Registers
The PowerSmart Socket PQM has 10 fully programmable
billing energy registers that can be linked to any internal
energy source or to any external pulse source that delivers
pulses through the device digital inputs.
Any of energy registers can provide either a single-tariff
energy accumulation or be individually linked to the TOU
system providing both total and multi-tariff energy billing.
See Configuring Billing/TOU in Chapter 5 on how to configure
the meter billing registers and tariff schedule for your
application.