AND
B1
B2
O
AND
B1
B2
O
OR
B1
B2
O
FALSE
FALSE
CBXBCR1_AU_OPEN
CONTROL_LOCAL
CONTROL_REMOTE
GUID-234BEA35-18B0-41CA-9B82-F7F4F098DBA7 V1 EN
Figure 97: External opening command for circuit breaker 1
3.4.3.5 Functional diagrams for measurement functions
The phase current inputs to the protection relay are measured by the three-phase
current measurement function CMMXU1. The current input is connected to the X120
card in the back panel. The sequence current measurement CSMSQI1 measures the
sequence current and the residual current measurement RESCMMXU1 measures the
residual current.
The three-phase bus side phase voltage inputs to the protection relay are measured by
three-phase voltage measurement VMMXU1. The voltage input is connected to the
X130 card in the back panel. The sequence voltage measurement VSMSQI1 measures
the sequence voltage and the residual voltage measurement RESVMMXU1 measures
the residual voltage.
The measurements can be seen in 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.
The frequency measurement FMMXU1 of the power system and the three-phase
power and energy measurement PEMMXU1 are available. Load profile record
LDPRLRC1 is included in the measurements sheet. LDPRLRC1 offers the ability to
observe the loading history of the corresponding feeder.
CMMXU1
BLOCK HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
GUID-D90049A9-79DB-4509-8FCF-698EA072ED0C V1 EN
Figure 98: Current measurement: Three-phase current measurement
GUID-B673B40B-4BC5-4B68-A9EA-D7B775EDDE1B V1 EN
Figure 99: Current measurement: Sequence current measurement
1MRS758127 C Section 3
RED615 standard configurations
RED615 85
Application Manual
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