Billing And Energy Metering - Satec expertmeter EM720 Operation Manual

Chapter 2 Operating the EM720

Billing and Energy Metering

Energy Measurement Channels
18
You can monitor the status of batteries from the front display
on the Device Info pages (see
3) and via the device diagnostics.
The auxiliary battery voltage is about 8.2 volts at full charge
(for at least 20 hours). If it falls below, then the battery
should be checked.
When the lithium battery voltage drops below the minimum
allowed level, it is indicated by the blinking "Battery Low"
icon on the display and via the device diagnostics. In this
event, the battery should be checked and replaced if
required.
NOTE
Always clear the battery operation time counters after
replacing a battery. See
Log Files in Chapter 6 for information on how to clear the
operation counters in your meter.
The EM720 provides
measurements with Class 0.2S IEC 62053-22 accuracy. The
following energy quantities are available for instrumentation
and billing:
• kWh import (Q1+Q4)
• kWh export (Q2+Q3)
• kWh net (Q1+Q4)-(Q2+Q3) - instrumentation
• kvarh import (Q1+Q2)
• kvarh export (Q3+Q4)
• kvarh net (Q1+Q2)-(Q3+Q4) - instrumentation
• kvarh Q1, Q2, Q3, Q4 quadrants
• kVAh import (Q1+Q4)
• kVAh export (Q2+Q3)
• kVAh total (Q1+Q2+Q3+Q4)
The EM720 uses two independent current channels for high-
accuracy energy measurements and for conventional high-
range instrumentation.
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 10 A RMS with 5 A
secondaries, while
measurements up to 50 A RMS.
EM720 Power Quality and Revenue Meter
Billing and Energy Metering
Device Info Display
Resetting Accumulators and Clearing
true four-quadrant
They have different
instrumentation currents
in Chapter
energy
gain and
provide