Toshiba GR-200-5 Instruction Manual page 263

SHOT1 logic
Initiation logic
SHOT2 logic
SHOT3 logic
SHOT4 logic
SHOT5 logic
Shoot number
coordination logic†
Figure 2.22-9 Shot counter logic for SHOT1 and SHOT2 logic blocks
Input signals for
Shot counter logic
INIT
CLOCK
0
(Undefined)
Not running
First cycle
1
Second cycle
Third cycle
Fourth cycle
†Note: we shall discuss the Shot counter coordination logic later.
‡Note: the actual Shot counter logic can increment the count to six, but we have omitted
the discussion after the second cycle for clarity.
The user can select the number of shots desired for autoreclosing using the scheme switch
[ARC-NUM], as cited in Chapter 2.22.4(i). When a single-shot scheme (S1) is preferred, setting
S1 is used to generate only a single shot (SHOT_1ST). When a multi-shot scheme is required
(e.g. S2 is preferred), the Shot counter logic will increment the count until the issue of the
'SHOT_2ND' signal is complete (that is, when S2 is set, the 'ARC CLOSE COMMAND' signal
will be issued at the first and second sequence). If after the second sequence the fault persists,
the final trip (signal 'ARC FT') is issued by the ARC function, see Figure 2.22-2.
S
ARC SHOT1
R
ARC NOT_IN-PROG
ARC SHOT2
ARC SHOT3
≥1
ARC SHOT4
ARC SHOT5
ARC COORD
Table 2.22-1 Counting in Shot counter logic†
SHOT_1ST SHOT_2ND
STEP0 STEP1
✓
✓
SHOT COUNTER
8000001B71
STEP0
INIT
8100001B72
STEP1
8200001B73
CLOCK STEP2
8300001B74
STEP3
8400001B75
STEP4
8500001B76
STEP5
Output signals for SHOT1–5 logics
SHOT_3RD SHOT_4TH
STEP2‡ STEP3‡
✓
- 243 -
6F2T0207 (0.01)
To Shot counter coordination logic †
MULTI-ARC INTT
To the flip-flop behind the SHOT1 logic
SHOT_1ST
To the flip-flop behind the SHOT2 logic
SHOT_2ND
To Start-up logic
SHOT_2ND
SHOT_3RD
SHOT_4TH
SHOT_5TH
SHOT NUMBER OVER
SHOT_5TH
STEP4‡
✓
✓
GRE200 (5,6)
SHOT
NUMBER
OVER
STEP5‡
✓