35
PXR trip unit and communication modules
MAGNUM PXR PRODUCT GUIDE PA013006EN September 2022 www.eaton.com
3
Measurement
The power and energy metering and the protection functions are calculated with the convention that power flow is from
line to load through the circuit breaker. This assumes the top side conductor to be the line side. If the distribution system
is configured such that the bottom side is the incoming side, the power values will indicate reverse power. This can be
changed by using the display and navigation buttons. See Table 10 for more information on metering data available with
PXR trip units.
Table 10. Metering data in the PXR 20 and PXR 25
Current metering in the PXR 20 & PXR 25 Units Accuracy
IA, IB, IC, IN, IG Amperes
± 0.5% of reading over the range of
10% to 120% x I
n
at 25°C
Minimum IA, IB, IC, IN, IG Amperes
Maximum IA, IB, IC, IN, IG Amperes
THD for IA, IB, IC, IN %
Demand IA, IB, IC, IN, IG Amperes
Demand Max. IA, IB, IC, IN, IG Amperes
Voltage metering in the PXR 25
VAB, VBC, VCA (line to line) Volts
± 0.5% of reading over the range of
102 to 690 Vac line-to-line at 25°C
Minimum VAB, VBC, VCA Volts
Maximum VAB, VBC, VCA Volts
THD for VAB, VBC, VCA %
VAN, VBN, VCN (line to neutral) Volts
Minimum VAN, VBN, VCN Volts
Maximum VAN, VBN, VCN Volts
Power metering in the PXR 25
Real kW
± 1% of reading over the range of
20% to 120% x I
n
, 102 to 690 Vac
line-to-line
PF: 0.8 leading to 0.5
lagging at 25°C
Apparent kVA
Reactive kvar
Real Demand kW
Apparent Demand kVA
Reactive Demand kvar
Real Demand (Peak) kW
Apparent Demand (Peak) kVA
Reactive Demand (Peak) kvar
Power Factor —
Energy metering in the PXR 25
Real Total (forward + reverse) kWh
Real Net (forward – reverse) kWh
Real Forward (delivered by source to load) kWh
Real Reverse (delivered by load to source) kWh
Apparent Energy kVAh
Reactive Received (in quadrant 3 & 4) kvarh
Reactive Delivered (in quadrant 1 & 2) kvarh
Reactive Total (delivered + received) kvarh
Reactive Net (delivered – received) kvarh
a
Neutral current accuracy for internal (4-pole) breakers, external neutral sensor accuracy is dependent on the selected sensor’s accuracy and tolerances.
b
Demand values are on a programmable fixed or sliding window of 5, 15 or 60 minutes.
c
Maximum and minimum values are held until reset.
To Next Page
Loading...
