ABB RELION REX640 Technical Manual page 1447

1MRS759142 F
8.1.4.8 Technical data
Table 1368: CMMXU Technical data
Characteristic
Operation accuracy
Suppression of harmonics
8.1.5 Three-phase voltage measurement VMMXU (ANSI VA, VB,
VC)
8.1.5.1 Identification
Function description
Three-phase voltage measurement
8.1.5.2 Function block
Figure 807: Function block
8.1.5.3 Functionality
The three-phase voltage measurement function VMMXU provides limit value
supervision output (HIGH_ALARM, HIGH_WARN, LOW_WARN, LOW_ALARM). Setting
parameters
and the deactivation of alarm and warning outputs.
Instantaneous phase-to-phase and phase-to-earth voltages in volts are available
for application configurations through outputs U_INST_AB, U_INST_BC and
U_INST_CA and U_INST_A, U_INST_B and U_INST_C, respectively.
REX640
Technical Manual
On delay time and Off delay time are used for controlling the activation
Value
Depending on the frequency of the measured
current: f ±2 Hz
n
±0.5 % or ±0.002 × I
(at currents in the range of 0.01...4.00 × I
DFT: -50 dB at f = n × f
RMS: No suppression
IEC 61850 IEC 60617
identification identification
VMMXU 3U
Measurement functions
n
)
n
, where n = 2, 3, 4, 5,...
n
ANSI/IEEE C37.2
device number
VA, VB, VC
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