1MRS751802-MUM
REX 521
123
Protection Relay
Technical Reference Manual, Standard Configurations
Fig. 7.4.1.-1
Function block symbol of CB wear
7.4.2.
TCS1
The trip-circuit supervision function block TCS1 does not perform the supervision
itself but it is used as an aid for configuration. The functional part belongs mainly to
the self-supervision tasks of the PS_ card.
Fig. 7.4.2.-1
Function block symbol of TCS1
7.4.3.
MCS 3I
The supervision function block MCS 3I detects interruptions in energizing current
circuits. The function block supervises the energizing circuits by comparing the
measured phase currents. If one or two phase currents exceed the setting “High
limit”, while the measured phase current in the remaining one or two phases is below
the setting “Low limit”, the output ALARM is activated after the adjustable alarm
delay.
The function block is disabled if all input currents are below the setting “Low limit”.
The ALARM output will reset automatically when the fault disappears.
The phase current supervision function block operates on the numerically calculated
fundamental frequency component of the phase currents.
Fig. 7.4.3.-1
Function block symbol of MCS 3I
7.4.4.
MCS 3U
The supervision function block MCS 3U detects interruptions in energizing voltage
circuits. The user can select three-phase or two-phase operation. The function block
can also be set out of use by means of the parameter.
OPEN
BINOPEN
BINCLOSE
ALARM
CB wear
TCSSTATE
BS
ALARM
TCS1
ALARM
MCS 3I
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