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E154713
7-3
7: Transformer Loss Compensation
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
The Values for %LWFE, %LWCU, %LVFE, and %LVCU are derived from the trans-
former and meter information, as demonstrated in the following sections.
The calculated loss compensation values are added to or subtracted from the mea-
sured Watts and VARs. The selection of adding or subtracting losses is made through
the meter's profile when programming the meter (see the following section for
instructions). The meter uses the combination of the add/subtract setting and the
directional definition of power flow (also in the profile) to determine how to handle the
losses. Losses will be "added to" or "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 20 kW 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.
7.2: Nexus® 1500+ Meter's Transformer Loss Compensation
• Performs calculations on each phase of the meter for every measurement taken;
unbalanced loads are handled accurately.
• Calculates numerically, eliminating the environmental effects that cause inaccura-
cies in electromechanical compensators.
• Performs bidirectional loss compensation.
• Requires no additional wiring; the compensation occurs internally.
• Imposes no additional electrical burden when performing loss compensation.
VAR
TotalTransfomerLoss
VA
TransformerFullScale
%LVFE
Vmeasured
Vnominal
-----------------------------
4
%LVCU
Imeasured
Inominal
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2
+
=
Summary of Contents for Shark 100T
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