Toshiba GR200 Series Instruction Manual page 255

Stub-OC characteristic
2.11.1
The characteristic of the stub-OC element is shown as a circle that has a center at the origin,
as shown in Figure 2.11-2. The user can set the threshold value of the stub-OC element using
setting [OCSTUB]. The STUB-OC function can operate when the user set scheme switch
[STUB] On.
Scheme logic
2.11.2
Figure 2.11-3 shows the stub-OC logic; the stub-OC function can issue trip signals during the
DS being opened (i.e., logic signal 'DS_OPEN' = 1 (TRUE1)).
OCSTUB
From ICD
ICD-A
ICD-B
ICD-C
≥1
Block-3P
STUBOC-2PBlk
Block-PerP
STUBOC-EN
On
800000EBB0 STUBOC_BLOCK
From PROT COMMON
DS_OPEN
STUB-Test
On
Scheme switch [OCSTUB-2fBlk] is provided in order that the OCSTBU element should
be blocked when second-harmonic frequency components (2f) are detected on the flowing
Figure 2.11-2 Characteristic of stub-OC
8000011C20
A
&
8100011C21
B &
8200011C22
C &
& ≥1
& ≥1
&
≥1
&
&
1
&
≥1
Figure 2.11-3 Scheme logic in STUB function
I
0
I
≥1
&
&
&
- 234 -
6F2S1915 (0.46)
8000001B60
OCSTUB-OR
8000001B20
STUBOC-TRIP-A
8100001B21
STUBOC-TRIP-B
8200001B22
STUBOC-TRIP-C
8300001B23
≥1
STUBOC-TRIP
&
STUBOC-ARC-BLOCK
STUBOC-OPT-A
STUBOC-OPT-B
STUBOC-OPT-C
STUBOC-TRIP
GRZ200 (Soft 031 & 032)
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