ABB Relion 611 series REB611 Product Manual page 24

Busbar and Multipurpose Differential Protection and Control
REB611
Product version: 1.0
Measurement functions
Table 33. Three-phase current measurement (CMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
Table 34. Residual current measurement (RESCMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
24
Value
Depending on the frequency of the current measured: f
±2 Hz
±0.5% or ±0.002 x I
n
(at currents in the range of 0.01...4.00 x I
DFT: -50 dB at f = n x f , where n = 2, 3, 4, 5,...
n
RMS: No suppression
Value
Depending on the frequency of the current measured: f/f
= ±2 Hz
±0.5% or ±0.002 x I
n
at currents in the range of 0.01...4.00 x I
DFT: -50 dB at f = n x f , where n = 2, 3, 4, 5,...
n
RMS: No suppression
1MRS757467 B
n
)
n
n
n
ABB