Toshiba GR200 Series Instruction Manual page 446

The CB is tripped forcibly in three-phases whether the relay applications detect single-phase
fault type or multi-phase fault type; then, the CB will be reclosed by the ARC function. To
reclose the CB, the permission signal of the voltage and synchronism check (VCHK†) function
is required in the TPAR mode.
†Note: VCHK are automatically applied in the TPAR mode (for ARC1 SHOT1 and ARC2
SHOT). For more information, see Chapter
auto reclose
Single- and three-phase auto reclose (Setting [ARC1-MODE]=SPAR&TPAR)
The CB is tripped in single-phase by the fault detection of relay applications if a single-phase
fault occurs; the ARC function tries to reclose the CB. Three-phase tripping is performed if a
multi-phase fault occurs; then, the CB will be reclosed by the ARC function. Note that the
VCHK permission signal is required to reclose the CB in the three-phase tripping (i.e., TPAR
scheme), but the VCHK permission signal is not required in signal-phase tripping (i.e., SPAR
scheme).
Setting selection about SPAR and TPAR modes
Since power can be transmitted through healthy phases even during the dead time, the SPAR
mode is convenient for maintaining power system stability. On the other hand, the capacitive
coupling effect between the healthy phase and faulty phase may cause a longer de-ionization
time when compared to the TPAR mode. That is, a longer dead time is required in the TPAR
mode. A shorter dead time can be set in the TPAR mode when compared to the SPAR mode.
For the TPAR mode in the 1.5CB arrangement, synchronism check and voltage check
(VCHH) between the bus bar (for bus CB#1) and the line or between the two lines (for center
CB#2) are required. The reclosing order between CB#1 and CB#2 can be selected using setting
[ARC-ORDER]; that is, CB#1 recloses first followed by CB#2 (i.e., [ARC-ORDER]=CB1)or vice
versa (i.e., [ARC-ORDER]=CB2). Simultaneous closure of CB#1 and CB#2 can also be selected
(i.e., [ARC-ORDER]=SIMUL).
Reclosing mode in parallel lines (Setting [ARC1-MODE]=MPAR)
(iii)
Only the faulted phases are tripped and reclosed, when the terminals of parallel lines are
interconnected during the dead time, through at least two or three different phases. The MPAR
mode realizes high-speed reclosing for multi-phase faults without synchronism and voltage
check (VCHK) and minimizes the possibility of outages in the case of double faults on parallel
lines. If the interlinking condition is not satisfied, and reclosing is conditionally permitted
based on the result of Link judgment logic. The user has to select a reclosing mode and the
number of healthy phases when the fault occurs (i.e., Settings [ARC-MANOLK] and [MPAR-
.
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6F2S1914 (0.49)
Relay application: Voltage check for
GRL200 (Soft 033 & 037)