ABB Relion 670 series, Technical Reference Manual

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Table 461: SCCVPTOC (51) Group settings (advanced)
Name Values (Range) Unit Step Default Description
tDelay 0.000 - 0.005 s 0.001 0.002 Time delay for start and trip signals
13.8.4.6 Technical data
Table 462: SCCVPTOC (51)technical data
Function Range or value Accuracy
Operate value,
overcurrent
(0 - 100)% of IBase ± 1,0% of I
n
Reset ratio, overcurrent >95% -
Timers (0.000-60.000) s ± 0.5% ± 10 ms
13.8.5 Carrier receive logic LCCRPTRC (94)
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Carrier receive logic LCCRPTRC - 94
13.8.5.1 Introduction
In Direct transfer trip (DTT) 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, 94) function
gives final trip output of the DTT scheme.
Features:
• Carrier redundancy to ensure security in DTT scheme
• Blocking function output on CR Channel Error
• Phase wise trip outputs
13.8.5.2 Principle of operation
The functionality of the Carrier receive logic (LCCRPTRC, 94) is to release the TRIP
signal for DTT scheme based on the LOCTR_A, LOCTRL_B, LOCTR_C, and
LOCTR signals coming from local criterion, and the Carrier receive signals CR! and
CR2. There are two modes of operation
1 out of 2 and 2 out of 2 . In the case of the 1
out of 2 mode if any one of the carrier signal is received then the trip signals will be
Section 13
1MRK505222-UUS C
Scheme communication
842
Technical reference manual