3300 ACM Installation and Operation Manual Power Measurement Ltd.
4-4 Measured Parameters
4.2.2 ENERGY & VOLT-HOURS
Introduction
Energy parameters include kW hours (kWH), kVAR hours
(kVARH), and kVA hours (kVAH). All energy parameters are
true RMS and represent the total for all 3 phases. kWH and
kVARH each provide three separate measurement modes
which indicate bi-directional power flow (see Section 4.3.3).
The Volt-Hour parameter can provide an indication of total
running time for an engine-generator set or other equipment.
Volt-Hours will be accumulated during the time that the
voltage on phase A is maintained above:
a) 60 VAC for a basic model direct connected.
b) 60% of full scale for a basic model connected using
PTs, or for any HIACC option.
NOTE
The Volt-Hours parameter can only be used
to sense an active line-to-neutral voltage in
Wye or Single Phase systems.
Energy and Volt-Hours readings are updated once each
second. Maximum range of these readings is 999,999,999.
Beyond this value, readings will roll over to zero (0).
Resetting the Energy Counters
The user can reset the value of all energy readings with which
the 3300 ACM has been equipped (kWH, kVARH, kVAH).
This can be performed using the CLEAR ALL HOURS?
parameter from the front panel in programming mode, or via
communications. Setting this parameter to YES will cause
the import, export, and total counters for each parameter to be
cleared to zero (0) when the user exits programming mode.
4.2 PARAMETER DESCRIPTIONS
4.2.1 REAL TIME
Real-time parameters include all voltage, current, power,
power factor, frequency and Volt-Hour measurements. For
phase dependent measurements, this includes per phase
readings, and averages or totals for all phases.
All real-time voltage, current and power measurements are
true RMS and are updated each second.
For power measurements, a positive number (i.e. no sign)
indicates real power in the forward direction (imported). A
negative number (i.e. negatively signed) indicates real power
in the reverse direction (exported).
Additional measurement modes available for real-time
parameters include demand and minima/maxima.
NOTE
Conventions used in regard to power factor
lead/lag are discussed in Section 4.3.4.
Courtesy of NationalSwitchgear.com
To Next Page
Loading...
Need help?
General
