ABB Relion SMU615 Product Manual page 19

Substation Merging Unit
SMU615
Product version: 1.0
Measurement functions
Table 31. Three-phase current measurement (CMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
Table 32. Sequence current measurement (CSMSQI)
Characteristic
Operation accuracy
Suppression of harmonics
Table 33. Residual current measurement (RESCMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
Table 34. Three-phase voltage measurement (VMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
Table 35. Sequence voltage measurement (VSMSQI)
Characteristic
Operation accuracy
Suppression of harmonics
ABB
Value
Depending on the frequency of the measured current: f
±0.5% or ±0.002 × I
n
(at currents in the range of 0.01...4.00 × I
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
RMS: No suppression
Value
Depending on the frequency of the measured current: f/f
±1.0% or ±0.002 × I
n
at currents in the range of 0.01...4.00 × I
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
Value
Depending on the frequency of the current measured: f/f
±0.5% or ±0.002 × I
n
at currents in the range of 0.01...4.00 × I
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
RMS: No suppression
Value
Depending on the frequency of the voltage measured: f
At voltages in range 0.01...1.15 × U
±0.5% or ±0.002 × U
n
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
RMS: No suppression
Value
Depending on the frequency of the voltage measured: f
At voltages in range 0.01...1.15 × U
±1.0% or ±0.002 × U
n
DFT: -50 dB at f = n × f , where n = 2, 3, 4, 5,...
n
1MRS758420 B
±2 Hz
n
)
n
= ±2 Hz
n
n
= ±2 Hz
n
n
±2 Hz
n
n
±2 Hz
n
n
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