ABB 1MRK002826-AG - Page 119

GUID-2068BBA0-9026-48D0-9DEB-301BCB3C600C v2
Table 149. Voltage harmonic monitoring VHMMHAI (50/60 Hz)
Function Range or value Accuracy
Fundamental Harmonic
Frequency (0.95 - 1.05) X f
r
2nd order to 5th order (0.1 - 0.5) X U
F
± 50 mHz
True RMS (10 to 150) V None ± 0.5% of U
(10 to 150) V 2nd order to 5th order (0.1 - 0.5) X U
F
± 2% of U
Fundamental (10 to 150) V None ± 0.5% of U
F
(10 to 150) V 2nd order to 5th order (0.1 - 0.5) X U
F
± 0.5% of U
F
Crest Factor (10 to 150) V None ± 2%
Harmonic
Amplitude
(10 to 150) V 2nd order to 5th order (0.1 - 0.5) X U
F
± 4% of U
H
Total Harmonic
Distortion
(VTHD)
(10 to 150) V 2nd order to 5th order (0.1 - 0.5) X U
F
± 4%
Note:
U
F
- Applied Voltage Fundamental
U
H
- Applied Voltage Harmonic (of respective harmonics)
U - Actual Voltage = RMS (U
F
and U
H
)
Generator protection REG670
1MRK 502 074-BEN M
Version 2.2
Hitachi Power Grids 119
© Copyright 2017 Hitachi Power Grids. All rights reserved