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3 Protection and measurement functions
3.4 Power and energy measurements
22
PXR Electronic trip unit
01/21 MN012005EN
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3.4 Power and energy measurements
The following power and energy values can be measured.
Table 13: Power and energy measurements
The power and energy values are calculated and updated internally at a
frequency of 1 Hz.
Measurement
1)
Unit of
measure
Note
Power measurement
Active power
kW
Updated after approximately 1 second
Apparent power
kVA
Updated after approximately 1 second
Reactive power
kvar
Updated after approximately 1 second
Active power requirement
kW
Fixed window of 5 to 60 minutes
Apparent power requirement
kVA
Fixed window of 5 to 60 minutes
Reactive power requirement
kvar
Fixed window of 5 to 60 minutes
Active power requirement (peak)
kW
Value is held until reset
Apparent power requirement (peak)
kVA
Value is held until reset
Reactive power demand (peak)
kvar
Value is held until reset
Power factor
–
Updated after approximately 1 second
Energy measurement
Active energy (forward)
kWh
From the source to the load
Active energy (reverse)
kWh
From the load to the source
Net active energy
kWh
“Active energy (forward)” - “active energy (reverse)”
Total active energy
kWh
“Active energy (forward)” + “active energy (reverse)”
Apparent energy
kVAh
Reactive energy (forward)
kvarh
From the source to the load
Reactive energy (reverse)
kvarh
From the load to the source
Net reactive energy
kvarh
“Reactive energy (forward)” - “reactive energy (reverse)”
Total reactive energy
kvarh
“Reactive energy (forward)” + “reactive energy (reverse)”
1) Accuracy: Class 1 (derived from IEC61557-12)
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