ABB REX 521 - 3 U_B

120
1MRS751802-MUM
Protection Relay
Technical Reference Manual, Standard Configurations
REX 521
7.3.6. 3U_B
The measurement function block 3U_B measures true RMS phase-to-earth or phase-
to-phase voltages. 3U_B measures only the calculated phase-to-phase voltage.The
voltage values are updated once per fundamental frequency cycle, that is, the
integration time for true RMS calculation is one fundamental cycle.
Fig. 7.3.6.-1 Function block symbol of 3U_B
Three-phase voltage measurement, 3U
UL1_U12
UL2_U23
UL3_U31
UL1_U12
UL2_U23
UL3_U31
UL1_U12 average
UL2_U23 average
UL3_U31 average
UL1_U12 average
UL2_U23 average
UL3_U31 average
0.00...999.99 kV
0.00...999.99 kV
0.00...999.99 kV
0.00...2.00 x Un
0.00...2.00 x Un
0.00...2.00 x Un
0.00...999.99 kV
0.00...999.99 kV
0.00...999.99 kV
0.00...2.00 x Un
0.00...2.00 x Un
0.00...2.00 x Un
Three-phase voltage measurement, 3U_B
UL1_U12
UL2_U23
UL3_U31
UL1_U12
UL2_U23
UL3_U31
UL1_U12 average
UL2_U23 average
UL3_U31 average
UL1_U12 average
UL2_U23 average
UL3_U31 average
0.00...999.99 kV
0.00...999.99 kV
0.00...999.99 kV
0.00...2.00 x Un
0.00...2.00 x Un
0.00...2.00 x Un
0.00...999.99 kV
0.00...999.99 kV
0.00...999.99 kV
0.00...2.00 x Un
0.00...2.00 x Un
0.00...2.00 x Un
3U_B
UL1_U12
UL2_U23
UL3_U31