Setting Guidelines - ABB REL670 2.2 IEC Applications Manual

Section 16
Scheme communication
16.8.5.3
16.8.6
16.8.6.1
16.8.6.2
734
based on phase-to-phase current variation. The main application is as one of local
criterion to increase security when transfer trips are used.

Setting guidelines

GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
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.
Carrier receive logic LCCRPTRC
Identification
Function description
Carrier receive logic
Application
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
IEC 61850 IEC 60617
identification identification
LCCRPTRC
Line distance protection REL670 2.2 IEC
1MRK 506 369-UEN B
GUID-00CE5289-3789-437D-A9AE-8E4BDD7C9D8A v2
GUID-13BF45AF-B04C-4C6D-B59D-79A51241C449 v1
GUID-D420E532-37DC-442F-B847-8F73EE8527A7 v1
ANSI/IEEE C37.2
device number
- 94
GUID-2CAA361A-C3A9-44F0-99DF-FB4E4FA227E3 v1
Application manual