ABB REX640 - Measurement Functions; Three-Phase Current Measurement (CMMXU); Sequence Current Measurement (CSMSQI); Residual Current Measurement (RESCMMXU)

Measurement functions
Table 204. Three-phase current measurement (CMMXU)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±0.5% or ±0.002 × I
n
(at currents in the range of 0.01...4.00 × I
n
)
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
RMS: No suppression
Table 205. Sequence current measurement (CSMSQI)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f/f
n
= ±2 Hz
±1.0% or ±0.002 × I
n
at currents in the range of 0.01...4.00 × I
n
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
Table 206. Residual current measurement (RESCMMXU)
Characteristic
Value
Operation accuracy At the frequency f = f
n
±0.5% or ±0.002 × I
n
(at currents in the range of 0.01...4.00 × I
n
)
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
RMS: No suppression
Table 207. Three-phase voltage measurement (VMMXU)
Characteristic
Value
Operation accuracy Depending on the frequency of the voltage measured: f
n
±2 Hz
At voltages in range 0.01…1.15 × U
n
±0.5% or ±0.002 × U
n
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
RMS: No suppression
Table 208. Single-phase voltage measurement (VAMMXU)
Characteristic
Value
Operation accuracy Depending on the frequency of the voltage measured: f
n
±2 Hz
At voltages in range 0.01…1.15 × U
n
±0.5% or ±0.002 × U
n
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
RMS: No suppression
1MRS759144 A
REX640
Product version: 1
94 ABB