ABB RET615 Product Manual page 47

ABB
Transformer Protection and Control
RET615
Product version: 4.0
Measurement functions
Table 55. Three-phase current measurement (CMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
Table 56. Three-phase voltage measurement (VMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
Table 57. Voltage sequence components (VSMSQI)
Characteristic
Operation accuracy
Suppression of harmonics
Table 58. Residual current measurement (RESCMMXU)
Characteristic
Operation accuracy
Suppression of harmonics
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 voltage measured: f
±2 Hz
At voltages in range 0.01...1.15 x U
±0.5% or ±0.002 x U
n
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 voltage measured: f
±2 Hz
At voltages in range 0.01...1.15 x U
±1.0% or ±0.002 x U
n
DFT: -50 dB at f = n x f , where n = 2, 3, 4, 5,...
n
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
1MRS756891 F
n
)
n
n
n
n
n
n
n
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