97
6
F
2
S
0
8
3
4
When an internal fault occurs during the power swing and all of the following conditions are
established, C/R SEND-PSB (PSB-CS) becomes 1 and the trip permission signal is sent for the
PUP or POP, and the trip block signal sending is stopped for the UOP or BOP as shown in Figure
2.4.15.4.
•
Power swing is continuing (PSB_DET=1).
•
Current change detection element operates (OCDP=1).
•
Reverse looking negative sequence directional element does not operate (DOCNR=0).
•
Forward looking negative sequence directional element operates (DOCNF=1).
•
Scheme switch PSB-TP is on.
•
Command protection is in service.
When a trip permission signal is received for the PUP or POP (CR=1), or no trip block signal is
received for the UOP or BOP (CR=0) as well as the conditions mentioned above are established
(PSB-CS=1), three-phase tripping signal is output (M-TRIP=1).
Reverse looking DOCNR is used for the current reversal logic (for current reversal logic, see
Section 2.4.3.6) in all the command protections.
(POP) (PUP)
1
CR-DEF
CR-DEF
PSB-CS
(External communication)
M-TRIP
&
(UOP) (BOP)
DOCN-F
&
≥
1
20ms
100ms
0 t
0 t
OCDP
PSB DET
+
[PSB-TP]
"ON"
DOCN-R
&
C/R SEND-PSB
357:OCDP-A
358:OCDP-B
359:OCDP-C
361
360
812:C/R_SEND-PSBA
813:C/R_SEND-PSBB
814:C/R_SEND-PSBC
Figure 2.4.15.4 Scheme Logic to Protect Faults during Power Swing
Setting
The setting elements necessary for the PSB and their setting ranges are as shown in the table
below.
Element Range
Step
Default Remarks
PSBSZ
0.50 - 15.00
Ω
0.01
Ω
2.00
Ω
PSBS detection zone
( 2.5 - 75.0
Ω
0.1
Ω
10.0
Ω
) (*)
PSBGZ
0.50 - 15.00
Ω
0.01
Ω
2.00
Ω
PSBG detection zone
( 2.5 - 75.0
Ω
0.1
Ω
10.0
Ω
) (*)
EFL
0.5 - 5.0 A
0.1 A
1.0 A
Residual overcurrent
( 0.10 - 1.00 A
0.01 A
0.20 A)
TPSB
20 - 60
1 ms
40 ms
Power swing timer
OCDP
0.5 – 10.0 A
0.1A
4.0 A
Current change
( 0.1 – 2.0 A
0.1 A
0.8 A)
detection element
DOCNF
4.0 A fixed
Forward looking negative
( 0.8A fixed)
sequence directional element
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