The phase voltage inputs to the merging unit are measured by the three-phase
voltage measurement function VMMXU1. The sequence voltage measurement
VSMSQI1 measures the sequence voltage.
The measurements can be seen from the WHMI and they are available under the
Measurement menu in the left navigation bar. Based on the settings, function
blocks can generate low alarm or warning and high alarm or warning signals for
the measured current values.
The frequency measurement of the power system FMMXU1 and the three-phase
power and energy measurement PEMMXU1 are also available.
CMMXU1
O:27|T:5|I:1
BLOCK
HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
CMMXU1_HIGH_WARN
Figure 21: Current measurement: Three-phase current measurement
CSMSQI1
O:9|T:5|I:1
Figure 22: Current measurement: Sequence current measurements
RESCMMXU1
O:26|T:5|I:1
BLOCK
HIGH_ALARM
HIGH_WARN
RESCMMXU11_HIGH_WARN
Figure 23: Current measurement: Residual current measurements
VMMXU1
O:34|T:5|I:1
BLOCK
HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
VMMXU1_HIGH_WARN
Figure 24: Voltage measurement: Three-phase voltage measurement
VSMSQI1
O:8|T:5|I:1
Figure 25: Voltage measurement: Sequence voltage measurements
FMMXU1
O:41|T:5|I:1
Figure 26: Frequency measurement
PEMMXU1
O:37|T:5|I:1
RSTACM
Figure 27: Three-phase power and energy measurement
1MRS758580 C
Merging unit variants
SMU615
Application Manual
47
Summary of Contents for Relion SMU615
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