E-Mon E-PS-S-HV-RTU - Manual (Page 24)

Chapter 2 Operating the
PowerSmart Socket PQM Power Transformer/Line Loss Compensation
24 PowerSmart Socket Power Quality Meter
Power Transformer/Line Loss Compensation
Loss compensation allows accounting for losses in power
transformers and/or power line in the event the billing and
metering points are located at different sides of the power
transformer or at different sides of the power line.
The calculated compensation values for kW and kvar losses
are added to the measured power quantities and energies.
The compensation values will be either positive, or negative
depending on whether losses are calculated at the supply side
or at the load side of the power transformer. They will be
positive if the meter is located at the load side while the
billing point is on the supply side, and negative in the
opposite direction.
The instantaneous kW and kvar losses for iron and copper
can be read and inspected via communications.
See Transformer/Line Loss Compensation Setup in Chapter 5
on how to program the loss constants and enable
compensation in your meter. See
Device Options and Mode
Control on how to enable and disable compensation in the
meter via the front display.
NOTES
1. When loss compensation is enabled, it is applied to all
billing data - one-second power values, power demands
and energy quantities. Loss compensation does not affect
instrumentation data – real-time power and fundamental
power values.
2. Loss compensation does not affect test LED pulse
outputs.
3. Loss compensation is not operational in meter test mode
regardless of the option’s status.
Operating Digital Inputs
The PowerSmart Socket PQM can monitor a total of 10 digital
inputs including two fast internal digital inputs and 8 inputs
found on the 8DI expansion module. See the PowerSmart
Socket PQM Installation Manual for digital input ratings and
connection diagrams.
Fast internal digital inputs are sampled at a 1-ms rate, and
expansion inputs are sampled at a 1/2-cycle rate.
Digital inputs functionality is programmable in the
PowerSmart Socket PQM and any digital input can perform
multiple metering and control functions at the same time:
• Receiving energy pulses from external watt meters (sub
metering) – link a digital input to a Billing/TOU register and
provide a required multiplication factor (see
Configuring
Billing/Tariff Registers in Chapter 5)
• Counting pulses from external pulse sources – link a digital
input to a pulse counter (see Using Counters in Chapter 5)