64
6
F
2
S
0
8
3
4
Single-phase tripping or three-phase tripping is also applicable to weak infeed tripping according
to the reclosing mode of the autoreclose function.
The weak infeed trip function can be disabled by the scheme switch [WKIT].
DEFWI_TRIP
&
[WKIT]
"ON"
(+)
UVL
ECHO1_DEF-R1
&
778, 779, 780
WKIT_BLOCK
1841
1
Figure 2.4.4.5 Weak Infeed Trip Logic
When the signaling channel of DEF POP or DEF UOP is separated from that of distance command
protection, the signal S-DEF2 is used for CS and assigned to a user configurable binary output
relay (see Section 3.2.2.).
DEF BOP scheme logic
Figure 2.4.4.6 shows the scheme logic of the DEF BOP.
&
&
≥
1
0 - 50ms
TDEFR
TCHD
0 - 300ms
20ms
t 0
CS
DEFF
DEFR
t 0
t 0
M-TRIP
&
&
t 0
TDEFF
R1-CR-DEF
R2-CR-DEF
&
[
TERM
]
"2TERM"
+
≥
1
1
1
TSBCT
0.00 – 1.00s
0 t
0.01 – 10.00s
0
t
TREBK
Figure 2.4.4.6 DEF BOP Scheme Logic
With the BOP, the signal transmitted is a trip block signal. When the reverse looking DEFR
operates, the logic level of the transmit signal CS becomes 1 and a trip block signal is transmitted.
When the trip block signal is received, R1-CR-DEF and R2-CR-DEF become 1.
When the forward looking DEFF operates, it executes tripping on condition that no trip blocking
signal should be received.
The delayed pick-up timer TCHD is provided to allow for the transmission delay of the trip block
signal from the remote terminal. Therefore, the time is set depending on the channel delay time.
TCHD setting = maximum signal transmission delay time(*) + 5ms
(*) includes delay time of binary output and binary input for the blocking signal when the external
communication is used.
The DEFR is also used for the current reversal logic (for current reversal, see Section 2.4.3.6).
When operation of the DEFR and non-operation of the DEFF last for 20 ms or more, even if the
DEFF operates or the DEFR is reset later, tripping of the local terminal is blocked for the TREBK
setting time and transmission of the trip block signal continues for the TSBCT setting time.
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Summary of Contents for GRZ100-211B
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