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EPM 5100 ELECTRONIC POWER METER – USER GUIDE
CHAPTER 3: METERING
3.2
Wye Configuration Metering Functions
3.2.1
Description
Following are descriptions of each of the metered values and status parameters available
with the EPM 5100 in a wye configuration. Note that prefixes such as k or M depend on
configuration, as described in Chapter 4. The suffixes A, B, C, and N generally refer to
phase A, phase B, phase C, and neutral, respectively.
3.2.2
Current (rms)
The EPM 5100 measures the current flowing in each line and determines the rms value.
The meter displays the CT primary current, with a dynamic range up to 500 kA, depending
on the CT ratio. Neutral current is calculated from the line values. Line and neutral current
values are identified on the LCD as “A A”, “A B”, “A C”, and “A N”.
3.2.3
Voltage
Line-to-Neutral Voltage (rms)
The EPM 5100 measures either the line-to-neutral voltage inputs directly for inputs up to
the rated voltage (69 to 600 V AC, as ordered) or from PTs for voltages above the rated
voltage. The dynamic range is up to the rated voltage at the inputs, or 1200 kV of the PT
primary voltage, depending on the PT ratio. Line-to-neutral voltages are identified on the
LCD as “V AN”, “V BN”, and “V CN”.
Line-to-Line Voltage (rms)
The EPM 5100 measures the line-to-line voltages directly for inputs up to the rated voltage
(69 to 600 V AC, as ordered) or from two or three line-to-line or line-to-neutral PTs for
voltages above the rated voltage. The dynamic range is up to the rated voltage at the
inputs, or 1200 kV of the PT primary voltage, depending on the PT ratio. Voltage line-to-line
values are identified on the LCD as “V AB”, “V BC”, and “V CA”.
3.2.4
Power
Real Power
The real power is measured for each phase and for the total. Reverse power readings (load
to line) are displayed as zero. Power values are identified on the LCD as “W A”, “W B”, “W C”,
and “W”.
Reactive Power
The reactive power is calculated for each phase and for the total. Values are identified on
the LCD as “Var A”, “Var B”, “Var C”, and “Var”.
Содержание EPM 5100
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