Satec expertmeter EM720 Operation Manual page 75

Chapter 5 Configuring the EM720
Parameter
Billing Point Location
Number of Metering Elements 2 (Open Delta)
Primary Rated Voltage, V
Secondary Rated Voltage, V
Rated Power, kVA
No-load Iron Watt Loss
Full-load Copper Watt Loss
Percent Excitation Current
Percent Impedance
Length, miles
Resistance, Ohm/mile
Reactance, Ohm/mile
Length, miles
Resistance, Ohm/mile
Reactance, Ohm/mile
Iron Watt Losses, %LWFe
Copper Watt Losses, %LWCu
Iron VAR Losses, %LVFe
Copper VAR Losses, %LVCu
Far end
EM720 Power Quality and Revenue Meter
Options
Supply side, far end,
Supply side,
transformer end,
Load side,
transformer end,
Load side, far end
3 (WYE)
Power Transformer Data
Supply-side Power Line Data
Load-side Power Line Data
%Loss Constants
The EM720 uses pre-calculated loss constants for correcting
meter readings. All calculations are performed by Pas using
transformer and power line data, and then the resulting loss
constants are downloaded to the meter. If power line losses
are included in compensation, they are added to the loss
constants.
For more information on the loss calculation techniques, see
the Handbook for Electricity Metering, 10-th edition, by the
Edison Electric Institute.
To configure loss constants in the meter:
1. Specify the locations of the meter and a point of
billing. The losses will be added to, or subtracted from
the measured power depending on the locations of the
metering and billing points. Use the picture and table
below to check your settings.
Metering point
Power transformer
Supply line
Transformer end
Description
Defines the location of the billing point:
far end – near the supply source or near the load,
transformer end – near the power transformer.
Defines the number of metering elements in the
meter depending on the wiring mode. Select 2 for
3OP2/3OP2, and 3 for 4LN3/4LL3 wiring modes.
Primary rated voltage of the power transformer
Secondary rated voltage of the power transformer
Rated transformer power
Watt losses at rated voltage due to iron
Watt losses at rated voltage due to copper
Transformer percent exciting current
Transformer percent impedance
Power line length, in miles or km
Power line resistance, in Ohm/mile or Ohm/km
Power line inductance, in Ohm/mile or Ohm/km
Power line length, in miles or km
Power line resistance, in Ohm/mile or Ohm/km
Power line inductance, in Ohm/mile or Ohm/km
Percent watt losses due to iron
Percent watt losses due to copper
Percent var losses due to iron
Percent var losses due to copper
Billing point
Load line
Transformer end
General Meter Setup
Far end
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