Billing And Energy Metering - Satec Expertmeter EM720 Operation Manual

Chapter 2 Operating the EM720

Billing and Energy Metering

Energy Measurement Channels
Energy Counters
Billing Energy Registers
Maximum Demand Registers
18
The EM720 provides
measurements for kWh imported and exported, kvarh
imported and exported, and total kVAh, with Class 0.2S
IEC 62053-22 accuracy.
The EM720 uses two independent current channels for
high-accuracy energy measurements and for conventional
high-range instrumentation. They have different gain and
measurement ranges as necessary for billing accuracy
energy metering
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 10 A
RMS with 5 A secondaries, while instrumentation currents
provide measurements up to 50 A RMS.
The EM720 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
in Chapter 5).
Billing energy registers have the same resolution as
instrumentation energy counters.
The EM720 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
configure the meter billing registers and tariff schedule for
your application.
Any of billing energy registers can be individually linked to
the maximum demand and cumulative maximum demand
EM720 Power Quality and Revenue Meter
Billing and Energy Metering
true four-quadrant
and for power
Device Options and Mode Control
in Chapter 5 on how to
energy
quality and fault