Toshiba GRZ100 B Series, Instruction Manual

Page: 45 / 447

⎯
44
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6 F 2 S 0 8 4 6
NO N _VTF
S-TR IP
&
&
≥
1
M-TR IP
Phase
Selection
R 1-C R
C S
Z1
PSB
" O N"
[
PSB-CR
]
R1-CR: Trip perm ission signal from the rem ote term inal.
S ignal No. S ignal nam e Description
1568: E XT_CA R.R1-1 Trip carrier signal from rem ote term inal
1569: E XT_CA R.R1-2 G uard/A nd carrier signal from rem ote term inal
TSBC T
0.00 – 1.00s
0 t
CS (C arrier send) signal
S ignal No. S ignal nam e
225: E XT_CA R-S
(PSBS_D ET/PSBG_D ET
from Figure 2.4.12.2.)
(from Figure 2.4.11.1.)
Z2
Z3
[ZO N ESEL]
"Z3"
"Z2"
&
≥
1
0-50m s
0 t
TC H D
&
PSC M _TCH D EN 1842
Figure 2.4.3.1 PUP Scheme Logic
To select the faulted phases reliably, phase selection is performed using the phase selection
element UVC. Phase selection logic in zone 1 tripping is shown in Figure 2.4.1.7 and its operation
is described in Section 2.4.1. Phase selection logic in command tripping is shown in Figure
2.4.3.9. Refer to Section 2.4.3.7.
Off-delay timer TSBCT is provided for the following purpose:
In many cases, most of the overreaching elements at both ends operate almost simultaneously.
However, there may be some cases where they cannot operate simultaneously due to unbalanced
distribution of fault currents. Non-operation of the overreaching elements can occur at a terminal
far from the fault, but they can operate if the other terminal trips. Transmission of the trip
permission signal continues for the setting time of TSBCT after reset of zone 1, and thus even the
terminal for which the overreaching element has delayed-picked up can also trip.
Setting
The following shows the setting elements necessary for the PUP and their setting ranges.
For the settings of Z1, Z2, Z3 and UVC, refer to Section 2.4.1.
Element Range Step Default Remarks
TCHD 0 - 50 ms 1 ms 12 ms Channel delay time
TSBCT 0.00 – 1.00s 0.01s 0.10s
PROTECTION
SCHEME 3ZONE/Z1EXT/PUP/POP/UOP
/BOP/POP+DEF/UOP+DEF/
BOP+DEF/PUP+DEF POP Scheme selection
ZONESEL Z2/Z3 Z2 Overreaching element selection
PSB - CR OFF/ON ON Power swing blocking
2.4.3.2 Permissive Overreach Protection
Application
In permissive overreach protection (POP), the terminal on which the forward overreaching
element operates transmits a trip permission signal to the other terminal. The circuit breaker at the
local terminal is tripped on condition that the overreaching element of the local terminal has
operated and that a trip permission signal has been received from the remote terminal. That is, POP
determines that the fault exists inside the protected line based on the overlapping operation of the