Toshiba GR200 Series - 2.9.1 Stub-OC characteristic; 2.9.2 Scheme logic

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 87 -
2.9.1 Stub-OC characteristic
The characteristic of the stub-OC element is shown as a circle that has a center at the origin,
as shown in Figure 2.9-2. 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.
I
0
I
Figure 2.9-2 Characteristic of stub-OC
2.9.2 Scheme logic
Figure 2.9-3 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)).
8200011C22
8000011C20
8100011C21
OCSTUB
A
B
C
≥1
ICD-B
ICD-C
&
&
&
ICD-A
DS_OPEN
≥1
800000EBB0 STUBOC_BLOCK
From PROT COMMON
STUBOC-EN
On
&
&
&
≥1
≥1
≥1
&
≥1
&
&
&
STUBOC-2PBlk
Block-PerP
Block-3P
From ICD
STUB-Test
On
&
OCSTUB-OR
STUBOC-TRIP
STUBOC-TRIP-A
STUBOC-TRIP-B
≥1
To TRC
To Recording
STUBOC-TRIP-C
8000001B60
&
8000001B20
8100001B21
8200001B22
&
8300001B23
STUBOC-TRIP
STUBOC-ARC-BLOCK
STUBOC-OPT-A
STUBOC-OPT-B
STUBOC-OPT-C
1
Figure 2.9-3 Scheme logic in STUB function
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