CHAPTER 7: TRANSFORMER LOSS COMPENSATION INTRODUCTION
EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 7–3
"subtracted from" (depending on whether add or subtract is selected) the Received Power
flow. For example, if losses are set to "Add to" and received power equals 2000 kW and
losses are equal to 20kW then the total metered value with loss compensation would be
2020 kW; for these same settings if the meter measured 2000 kW of delivered power the
total metered value with loss compensation would be 1980 kW.
Since transformer loss compensation is the more common loss compensation method, the
meter has been designed for this application. Line loss compensation is calculated in the
meter using the same terms but the percent values are calculated by a different
methodology.
EPM 9450/9650 Meter Transformer Loss Compensation:
• Performs calculations on each phase of the meter for every measurement taken.
Unbalanced loads are accurately handled.
• Calculates numerically, eliminating the environmental effects that cause
inaccuracies in electromechanical compensators.
• Performs Bidirectional Loss Compensation.
• Requires no additional wiring; the compensation occurs internally.
• Imposes no additional electrical burden when performing Loss Compensation.
Loss Compensation is applied to 1 second per phase Watt/VAR readings and, because of
that, affects all subsequent readings based on 1 second per phase Watt/VAR readings.
This method results in loss compensation being applied to the following quantities:
•Total Power
• Demands, per Phase and Total (Thermal, Block (Fixed) Window, Rolling (Sliding)
Window and Predictive Window)
• Maximum and Minimum Demands
• Energy Accumulations
• KYZ Output of Energy Accumulations
Note
Loss Compensation is disabled when the meter is placed in Test Mode.
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