ABB Relion SMU615 Product Manual page 20

Substation Merging Unit
SMU615
Product version: 1.0
Table 36. Three-phase power and energy measurement (PEMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
1) |PF| >0.5 which equals |cosφ| >0.5
2) |PF| <0.86 which equals |sinφ| >0.5
Table 37. Frequency measurement (FMMXU)
Characteristic
Operation accuracy
20
Value
At all three currents in range 0.10...1.20 × I
At all three voltages in range 0.50...1.15 × U
At the frequency f ±1 Hz
n
±1.5% for apparent power S
±1.5% for active power P and active energy
±1.5% for reactive power Q and reactive energy
±0.015 for power factor
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
Value
±5 mHz
(in measurement range 35...75 Hz)
1MRS758420 B
n
n
1)
2)
ABB