FRANKLINWH APower - Appendix 2: FHP Energy Metering; Measurement Accuracy Requirements

Appendix 2: About FHP energy metering
Energy visibility data on power and energy usage is needed for the FHP system, including metering for site energy, solar energy, and
BESS advanced inverter by measuring voltage (by voltage tap) and current (by current transformer, CT) building-in the units of
aGate and aPower.
FHP metering have complied with the standard IEEE 1547, section 4.4 Measurement accuracy, table 3-Minimum measurement and
calculation accuracy requirements for manufacturers. The actual measurement and calculation accuracy of FHP are stated here as
shown following.
Time frame Steady-state measurements Transient measurements
Parameter
Minimum
measurement
accuracy
Measurement
window
Range
Minimum
measurement
accuracy
Measurement
window
Range
Voltage, RMS
± 1% Vnom
10 cycles 0.5 p.u. to 1.2 p.u.
± 2% Vnom
5 cycles
0.5 p.u. to 1.2 p.u.
Frequency 10mHz 60 cycles 50 Hz to 66 Hz 100mHz 5 cycles 50 Hz to 66 Hz
Active Power
± 2% Srated
10 cycles 0.2 p.u. <P < 1.0p.u. N/A N/A N/A
Reactive Power
± 2% Srated
10 cycles 0.2 p.u. <Q < 1.0p.u. N/A N/A N/A
Time
1% of measured
duration
NA 5 s to 600 s 2 cycles N/A 100 ms < 5 s
Table Statement of FHP energy measurement accuracy
78