ABB RET630 - Measurement Functions; Three-Phase Current Measurement; Three-Phase Voltage Measurement; Residual Current Measurement

Measurement functions
Table 69. Three-phase current measurement (CMMXU)
Characteristic Value
Operation accuracy At the frequency f = f
n
±0.5% or ±0.002 x I
n
(at currents in the range of 0.01...4.00 x I
n
)
Suppression of harmonics DFT: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,
…
RMS: No suppression
Table 70. Three-phase voltage measurement (VPHMMXU )
Characteristic
Value
Operation accuracy At the frequency f = f
n
±0.5% or ±0.002 x U
n
(at voltages in the range of 0.01...1.15 × U
n
)
Suppression of harmonics DFT: -50dB at f = n × f
n
, where n = 2, 3, 4, 5,
…
RMS: No suppression
Table 71. Three-phase voltage measurement (VPPMMXU )
Characteristic
Value
Operation accuracy At the frequency f = f
n
±0.5% or ±0.002 x U
n
(at voltages in the range of 0.01...1.15 × U
n
)
Suppression of harmonics DFT: -50dB at f = n × f
n
, where n = 2, 3, 4, 5,
…
RMS: No suppression
Table 72. Residual current measurement (RESCMMXU)
Characteristic
Value
Operation accuracy At the frequency f = f
n
±0.5% or ±0.002 x I
n
(at currents in the range of 0.01...4.00 x I
n
)
Suppression of harmonics DFT: -50dB at f = n x f
n
, where n = 2, 3, 4, 5,
…
RMS: No suppression
Transformer Protection and Control 1MRS756788 A
RET630
Product version: 1.0 Issued: 15.09.2009
ABB 47