GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(
UBase) and (SBase).
I>: Level of fixed threshold given in % of IBase. This setting should be based on fault
calculations to find the current increase in case of a fault at the most remote point where the
direct trip scheme shall be active. The phase to phase current shall be calculated for different
types of faults (single phase to earth, phase to phase to earth, phase to phase and three phase
short circuits) at different switching states in the network. In case of switching of large
objects (shunt capacitor banks, transformers, etc.) large change in current can occur. The
I>
setting should be larger than estimated switch in currents measured by the protection.
tHold: Hold time (minimum signal duration). This time setting shall be long enough to assure
that the CR-signal is received. The default value
0.5 s is recommended.
tDelay: Trip time is set according to the individual application.
15.8.6
Carrier receive logic LCCRPTRC
GUID-13BF45AF-B04C-4C6D-B59D-79A51241C449 v1
15.8.6.1
Identification
GUID-D420E532-37DC-442F-B847-8F73EE8527A7 v1
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Carrier receive logic
LCCRPTRC
-
94
15.8.6.2
Application
GUID-2CAA361A-C3A9-44F0-99DF-FB4E4FA227E3 v1
In the Direct transfer trip scheme, the received CR signal gives the trip to the circuit breaker
after checking certain local criteria functions in order to increase the security of the overall
tripping functionality. Carrier receive logic (LCCRPTRC) checks for the CR signals and passes
the local check trip to the circuit breaker.
LCCRPTRC receives the two CR signals, local criterion trip signals and releases the trip to the
circuit breaker based on the input signal status and mode of operation. There are two modes
of operation in CR channel logic. In the case of '1 out of 2' mode if any one of the two CR is
received then the trip signal coming from the local criterion is released, and in case of '2 out of
2' mode both the CR’s should be received to release the trip signal coming from the local
criterion. Both the CR signals are validated using the channel error binary flag.
15.8.6.3
Setting guidelines
GUID-FE0C0FC7-461E-476C-8C24-36A49E0E2587 v1
ChMode: This parameter can be set 1 out of 2 or 2 out of 2. The parameter gives the conditions
for operation of the transfer trip function, i.e. if only one CR signal is required or of both CR
signals are required for trip (in addition to local criteria). If only one channel is available the
parameter must be set
1 out of 2. If parallel channels are available 2 out of 2 gives a high
degree of security but can decrease the dependability if one channel is faulted.
tOperate: Trip time is normally set maximum 0.1 s.
15.8.7
Negative sequence overvoltage protection LCNSPTOV
GUID-F15A69BA-58B1-4F3E-AE12-11FF71B96021 v1
1MRK 505 343-UEN B
Section 15
Scheme communication
627
Application manual
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