ABB Relion 615 series - Page 48

Measurement functions
Table 60. 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 61. 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 62. Residual current measurement (RESCMMXU)
Characteristic
Value
Operation accuracy Depending on the frequency of the current measured: f/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 63. 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 64. Residual voltage measurement (RESVMMXU)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured voltage: f/f
n
= ±2 Hz
±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
Transformer Protection and Control
1MRS756891 M
RET615
Product version: 5.0 FP1
48 ABB