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TRC function. ‘FC*_OPT_TRIP’ represents a three-pole trip signal. ‘ARC-BLOCK’
represents a signal used to block the operation of the ARC function; the ‘ARC-
BLOCK’ signal is transferred to the autoreclose function (ARC). Incidentally, the
term ‘FC*’ represents one of the relay elements connected to the TRC function.
Table 2.33-3 and Table 2.33-4 summarize the operation results in the TRC function. Table
2.33-3, shows the correspondents between the input signals (which are signals provided from
the protection functions) and their reasons (that is, types of faults). For example, if a fault
(1LG in phase A) occurs, ‘FC*_OPT_TRIP-A’ signal may be provided for the TRC function from
a protection function; the TRC function may generates ‘TRIP-COMMAN1-A’ and ‘TRIP-
COMMAND2-A’ signals when the scheme switch [TP-MODE]=PER-PHASE (see Table 2.33-4).
Note that Table 2.33-3 illustrates generic operation rules concerning fault types; the inputs
depend on the practical operation of relay functions. Hence, the user should figure out actual
inputs using Table 2.33-2 together with the characteristics of respective protection functions.
Note the TRC outputs will be influenced by the signals generated in the ARC function.
That is, when a CB1_BRIDGE or a CB1_94TT signal is generated and it is injected into the
TRC function, the TRC function is instructed to output a three-phase tripping (i.e., issuing
CB1_94TT following ARC1 FT or TPAR) or the TRC function is instructed to operate
unconditionally in three-phase tripping mode (i.e., issuing CB1_BRIDGE following ARC1
UNREADT). We shall see a number of operation settings [ARC1-MODE] and [ARC2-MODE] in
the ARC function.
Table 2.33-3 Trip command and its correspondent fault
Inputs (See Table 2.33-2)
Trip signals coming from protection functions (FC*)
FC*_OPT_TRIP-A and FC*_OPT_TRIP-B
FC*_OPT_TRIP-B and FC*_OPT_TRIP-C
FC*_OPT_TRIP-C and FC*_OPT_TRIP-A
FC*_OPT_TRIP (=FC*_OPT_TRIP-A & B & C)
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