46
6
F
2
S
0
8
3
4
≥
1
&
≥
1
≥
1
CB-OR
Z4
Z2
Z3
UVL
ECH
WIT
100ms
S-TRIP
M-TRIP
20ms
CS
Phase
Selection
t
0
0
t
CRL
[ZONESEL]
"Z3"
"Z2"
1
R1-CR
R2-CR
&
[
TERM
]
"2TERM"
+
≥
1
TREBK
≥
1
&
≥
1
TECCB
0.00 - 200.00s
t 0
TSBCT
0.00 – 1.00s
0 t
(
∗
) Note: Details of UVL
Signal No. Signal name Description
72: UVLS-AB A-B phase
73: UVLS-BC B-C phase
74: UVLS-CA C-A phase
78: UVLG-A A phase
79: UVLG-B B phase
80: UVLG-C C phase
(
∗
)
&
&
&
&
" ON "
NON VTF
PSB
[PSB-CR]
&
≥
1
0-50ms
0
t
TCHD
&
PSCM_TCHDEN
1842
Figure 2.4.3.2 POP Scheme Logic
Transmission of the trip permission signal continues for the TSBCT setting even after the local
terminal is tripped by the delayed drop-off timer TSBCT. This is to ensure that command tripping
is executed at the remote terminal.
The POP outputs single-phase tripping signal S-TRIP or three-phase tripping signal M-TRIP to
the local terminal when the trip permission signal R1-CR and R2-CR are received from the remote
terminals, the current reversal logic (CRL) is not picked up and one of the following conditions is
established.
•
The forward overreaching element operates.
•
The undervoltage element UVL (UVLS or UVLG) operates and the forward
overreaching and the reverse looking elements do not operate.
The latter is implemented when the weak infeed trip function is selected. (Refer to Section 2.4.3.5
for weak infeed trip function.)
When the integral communication channel is used, the trip permission signals sent and received
contain three phase-segregated signals for earth faults and one signal for phase faults. When the
external communication channel is used, a single trip permission signal is common to all fault
types.
To select the faulted phase reliably, phase selection is performed using the phase selection element
UVC. Phase selection logic is described in Section 2.4.3.7.
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