4
1. Introduction to the Power Xpert® Release trip unit
PXR tRiP units foR PoweR Defense molDeD case ciRcuit bReakeRs
MN012007EN March 2019 www.eaton.com
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
PXR 10
PXR 20
PXR 20D
PXR 25
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)
PXR 10
PXR 20
PXR 20D
PXR 25
Current (I)
5 to 10 % of In (A)
5.0 %
5.0 %
1.0 %
1.0 %
10 to 120 % of In (A)
5.0 %
2.0 %
0.5 %
0.5 %
Voltage (V)
60 to 102 (V)
not applicable
1.0 %
102 to 690 (V)
0.5 %
690 to 750 (V)
1.0 %
Power (kW)
Energy (kWh)
5% to 10% of In (A)
102 to 690 (V)
Power factor = 1
1.5 %
10 to 120 % of In (A)
102 to 690 V
Power factor = 1
1.0 %
Power (kW)
Energy (kWh)
10 to 20 % of In (A)
102 to 690 (V)
PF = 0.5 inductive or 0.8 capacitive
1.5 %
20 to 120 % of In (A)
102 to 690 (V)
PF = 0.5 inductive or 0.8 capacitive
1.0 %
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
Description
units
Voltage unbalance
Difference between the maximum and minimum of the 3 voltage readings
(Vab, Vbc, Vca)
Volts
Current unbalance
Difference between the maximum and minimum of the 3 current readings (Ia,
Ib, Ic)
Amps
Total harmonic distortion (THD)
Voltage, line-to-line (Vab, Vbc, Vca)
%
Voltage, line-to-neutral (Van, Vbn, Vcn)
Current (Ia, Ib, Ic, In)
Harmonic content
(1st through 35th at 50 Hz)
(1st through 29th at 60 Hz)
Voltage, line-to-line (Vab, Vbc, Vca)
Voltage, line-to-neutral (Van, Vbn, Vcn)
Current (Ia, Ib, Ic, In)
