446
6
F
2
S
0
8
3
4
6
CF occurs at relay A’s CH1 and
C’s CH1.
Relay B
Relay A
CH1
CH2
CH1
CH2
Relay C
CH2
CH1
-Case 1 (Fault at near A-term)
Relay A: Z1 trip
Relay B: PUP trip
Relay C: PUP trip by backup
carrier
-Case 2 (Fault at near B-term)
Relay A: PUP trip by backup
carrier
Relay B: Z1 trip
Relay C: PUP trip
-Case 3 (Fault at near C-term)
Relay A: PUP trip
Relay B: PUP trip by backup
carrier
Relay C: Z1 trip
-Case 1 (Fault at near A-term)
Relay A: Z1 trip
Relay B: POP or UOP trip by
backup carrier
Relay C: POP or UOP trip by
backup carrier
-Case 2 (Fault at near B-term)
Relay A: POP or UOP trip by
backup carrier
Relay B: Z1 trip
Relay C: POP or UOP trip by
backup carrier
-Case 3 (Fault at near C-term)
Relay A: POP or UOP trip by
backup carrier
Relay B: POP or UOP trip by
backup carrier
Relay C: Z1 trip
-Case 1 (Fault at behind A-term)
Relay A: BOP trip blocked
Relay B: ditto
Relay C: BOP trip blocked by
backup carrier
-Case 2 (Fault at behind B-term)
Relay A: BOP trip blocked by
backup carrier
Relay B: BOP trip blocked
Relay C: ditto
-Case 3 (Fault at behind C-term)
Relay A: BOP trip blocked
Relay B: BOP trip blocked by
backup carrier
Relay C: BOP trip blocked
-Case 1 (Fault at behind A-term)
Relay A: BOP trip blocked
Relay B: ditto
Relay C: BOP trip blocked by
backup carrier
-Case 2 (Fault at behind B-term)
Relay A: BOP trip blocked by
backup carrier
Relay B: BOP trip blocked
Relay C: ditto
-Case 3 (Fault at behind C-term)
Relay A: BOP trip blocked
Relay B: BOP trip blocked by
backup carrier
Relay C: BOP trip blocked
Relay operation
Mode
No.
Communication failure mode
PUP scheme
POP or UOP scheme
BOP scheme (SCFCNT=Trip)
BOP scheme (SCFCNT=BLK)
7
CF occurs at relay A’s CH1,
B’s CH2 and C’s CH1
Relay B
Relay A
CH1
CH2
CH1
CH2
Relay C
CH2
CH1
Severe CF mode
-Case 1 (Fault at near A-term)
Relay A: Z1 trip
Relay B: PUP trip by backup
carrier
Relay C: PUP trip
-Case 2 (Fault at near B-term)
Relay A: Distance delay trip
[Carrier trip is impossible.]
Relay B: Z1 trip
Relay C: PUP trip
-Case 3 (Fault at near C-term)
Relay A: Distance delay trip
[Carrier trip is impossible.]
Relay B: PUP trip
Relay C: Z1 trip
-Case 1 (Fault at near A-term)
Relay A: Z1 trip
Relay B: POP or UOP trip by
backup carrier
Relay C: POP or UOP trip by
backup carrier
-Case 2 (Fault at near B-term)
Relay A: Distance delay trip
[Carrier trip is impossible.]
Relay B: Z1 trip
Relay C: POP or UOP trip by
backup carrier
-Case 3 (Fault at near C-term)
Relay A: Distance delay trip
[Carrier trip is impossible.]
Relay B: POP or UOP trip by
backup carrier
Relay C: Z1 trip
-Case 1 (Fault at behind A-term)
Relay A: BOP trip blocked
Relay B: BOP trip blocked by
backup carrier
Relay C: BOP trip blocked
-Case 2 (Fault at behind B-term)
Relay A: BOP trip
(Block command can’t be
received)
Relay B: BOP trip blocked
Relay C: ditto
-Case 3 (Fault at behind C-term)
Relay A: BOP trip
(Block command can’t be
received)
Relay B: BOP trip blocked
Relay C: ditto
-Case 1 (Fault at behind A-term)
Relay A: BOP trip blocked
Relay B: BOP trip blocked by
backup carrier
Relay C: BOP trip blocked
-Case 2 (Fault at behind B-term)
Relay A: BOP trip blocked
[Command protection blocked
under Severe CF in
SCFCNT=BLK]
Relay B: BOP trip blocked
Relay C: ditto
-Case 3 (Fault at behind C-term)
Relay A: BOP trip blocked
[Command protection blocked
under Severe CF in
SCFCNT=BLK]
Relay B: BOP trip blocked
Relay C: ditto
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Summary of Contents for GRZ100-211B
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