3.3.3.5 Functional diagrams for measurement functions
The phase current inputs to the IED are measured by the three-phase current
measurement function CMMXU1. The current input is connected to the X120 card in
the back panel. Similarly, the sequence current measurement CSMSQI1 measures the
sequence current and the residual current measurement RESCMMXU1 measures the
residual current.
The residual voltage input is connected to the X120 card in the back panel and is
measured by the residual voltage measurement RESVMMXU1.
The measurements can be seen from the LHMI and they are available under the
measurement option in the menu selection. Based on the settings, function blocks can
generate low alarm or warning and high alarm or warning signals for the measured
current values.
CMMXU1
BLOCK HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
GUID-C4DBF3EA-C264-4F60-941B-FAFDADD11315 V1 EN
Figure 44: Current measurement: Three phase current measurement
GUID-57A365D0-D629-4DDC-9268-D5D427C6F5A8 V1 EN
Figure 45: Current measurement: Sequence current measurements
RESCMMXU1
BLOCK HIGH_ALARM
HIGH_WARN
GUID-D962598F-BE1F-42E2-AE3D-A20F1F87B01B V1 EN
Figure 46: Current measurement: Residual current measurements
RESVMMXU1
BLOCK HIGH_ALARM
HIGH_WARN
GUID-F5BC01C6-A8C3-4AA7-A54F-C68DDE881775 V1 EN
Figure 47: Voltage measurement: Residual voltage measurements
GUID-14B7A3F2-9DF7-45AE-A63B-298C6F26C616 V2 EN
Figure 48: Other measurement: Data monitoring
Section 3 1MRS756378 S
REF615 standard configurations
68 REF615
Application Manual
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