Metering Features - Eaton Power Xpert PXR Series Manual

1. Introduction to the Power Xpert® Release trip unit

1.2 Metering features

The following table shows the electrical system information which is metered by the trip
unit. It is available for viewing in PXPM, on the display (if equipped) or for reading via
communication channels.
metering data
Current
Current maximum and minimum
Voltage line to line and line to neutral
Voltage maximum and minimum ( L-L and L-N )
Power kW (real, demand, peak)
Power kVAR (reactive, demand, peak)
Power kVA (apparent, demand, peak)
Energy kWh (total, fwd, rev) VARh (net), VAh (net)
Frequency
Power factor
1.2.1 Metered data specifications
Metered data accuracy is as follows:
metered value Range of conditions (units)
5 to 10 % of In (A)
Current (I)
10 to 120 % of In (A)
60 to 102 (V)
Voltage (V) 102 to 690 (V)
690 to 750 (V)
5% to 10% of In (A)
102 to 690 (V)
Power factor = 1
Power (kW)
Energy (kWh)
10 to 120 % of In (A)
102 to 690 V
Power factor = 1
10 to 20 % of In (A)
102 to 690 (V)
PF = 0.5 inductive or 0.8 capacitive
Power (kW)
Energy (kWh)
20 to 120 % of In (A)
102 to 690 (V)
PF = 0.5 inductive or 0.8 capacitive
Note: Accuracy is expressed as % of reading, currents are RMS, voltages are line-to-line.
In addition to the electrical system information metered for line protection, the following
data is available from the motor protection function in the PXR 25 -MP . It is viewed on the
display, in PXPM, or via communication channels.
metered data
Voltage unbalance
Current unbalance
Total harmonic distortion (THD)
Harmonic content
(1st through 35th at 50 Hz)
(1st through 29th at 60 Hz)
4
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PXR 10
*
PXR 10
5.0 %
5.0 %
Description
Difference between the maximum and minimum of the 3 voltage readings
(Vab, Vbc, Vca)
Difference between the maximum and minimum of the 3 current readings (Ia,
Ib, Ic)
Voltage, line-to-line (Vab, Vbc, Vca)
Voltage, line-to-neutral (Van, Vbn, Vcn)
Current (Ia, Ib, Ic, In)
Voltage, line-to-line (Vab, Vbc, Vca)
Voltage, line-to-neutral (Van, Vbn, Vcn)
Current (Ia, Ib, Ic, In)
PXR 20 PXR 20D
* *
* *
PXR 20 PXR 20D
5.0 % 1.0 %
2.0 % 0.5 %
not applicable
PXR 25
*
*
*
*
*
*
*
*
*
*
PXR 25
1.0 %
0.5 %
1.0 %
0.5 %
1.0 %
1.5 %
1.0 %
1.5 %
1.0 %
units
Volts
Amps
%