Toshiba GRZ100-211B, Инструкция по эксплуатации, Страница: 144 / 463

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143
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6 F 2 S 0 8 3 4
CB
Line VT
Busbar VT
VT setting
GRZ100
Busbar
Line
VL
X
VTs1 setting
VB
Reference voltage
for voltage and
synchronism check
For distance
protection
Figure 2.7.3.1 VT and VTs1 Ratio Setting for Busbar or Line Voltage
To determine the dead time, it is essential to find an optimal value while taking factors,
de-ionization time and power system stability, into consideration which normally contradict one
other.
Normally, a longer de-ionization time is required for a higher line voltage or larger fault current.
For three-phase autoreclose, the dead time is generally 15 to 30 cycles. In single-phase
autoreclose, the secondary arc current induced from the healthy phases may affect the
de-ionization time. Therefore, it is necessary to set a longer dead time for single-phase autoreclose
compared to that for three-phase autoreclose.
In three-phase autoreclose, if the voltage and synchronism check does not operate within the
period of time set on the delayed pick-up timer TRR which is started at the same time as the dead
time counter TTPR1 is started, reclosing is not performed and three-phase autoreclose is reset to
its initial state. Therefore, for example, TRR is set to the time setting of the TTPR1 plus 100 ms.
The TEVLV determines the possibility of three-phase reclosing for an evolving fault.
When the TEVLV is set to the same setting as the TSPR, three-phase reclosing is performed for all
evolving faults. As the setting for the TEVLV is made shorter, the possibility of three-phase
reclosing for an evolving fault becomes small and that of three-phase final tripping becomes large.
For the two-breaker autoreclose, the following additional settings are required.
Element Range Step Default Remarks
VTs2 1 - 20000 1 2000 VT ratio for voltage and synchronism check SYN2
TSPR2 0.1 – 10.0s 0.1s 0.1s Dead time for single-phase autoreclose of
follower breaker
TTPR2 0.1 – 10.0s 0.1s 0.1s Dead time for three-phase autoreclose of follower
breaker
TRDY2 5 – 300s 1s 60s Reclaim time of follower breaker
SYN2 Synchronism check
SY2
θ
5 – 75° 1° 30°
SY2UV 10 – 150V 1V 83V
SY2OV 10 – 150V 1V 51V
OVL2 10 – 150V 1V 51V Live line check
UVL2 10 – 150V 1V 13V Dead line check
TSYN2 0.01 – 10.00s 0.01s 1.00s Synchronism check time
TLBD2 0.01 – 1.00s 0.01s 0.05s Voltage check time
TDBL2 0.01 – 1.00s 0.01s 0.05s Voltage check time
TW2 0.1 – 10.0s 0.1s 0.2s Reclosing signal output time
[ARC-CB] ONE/O1/O2/L1/L2 L1 Two breaker autoreclose mode
[VCHK] OFF/LB1/LB2/DB/SYN LB1 Energizing direction
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