ABB RELION REX640 - 8.1.5 Three-phase voltage measurement VMMXU (ANSI VA, VB, VC); 8.1.5.1 Identification; 8.1.5.2 Function block; 8.1.5.3 Functionality

8.1.4.8 Technical data
Table 1368: CMMXU Technical data
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
8.1.5 Three-phase voltage measurement VMMXU (ANSI VA, VB,
VC)
8.1.5.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase voltage measurement VMMXU 3U VA, VB, VC
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 On delay time and Off delay time are used for controlling the activation
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.
1MRS759142 F
Measurement functions
REX640
Technical Manual
1447