Toshiba GR-200 Series Instruction Manual page 743

Operating time alarm (OPTA)
10.3.3
Operating time alarm (OPTA) function is provided for CB mechanism maintenance. The
function checks that CB opens properly after IED outputs CB trip signal. If CB does not open
after a certain time has passed since IED outputted CB trip signal, operating time alarm
(OPTA) function issues an alarm.
Operation
(i)
Logics
Figure 10.3-5 shows the scheme logic for judging the operating time alarm.
If the CB_OPEN signal does not generate before the timer value defined by the setting
[OPTALM] elapses after the GEN.TRIP signal as the CB trip signal is generated, the alarm
signal OPTA_FAIL is generated.
Once OPTA_FAIL signal is generated the signal is latched, and it can be released by the
generation of PLC command [OPTA_RESET_COMMAND]. The "CLEAR" key command is
assigned to the PLC command as default.
The logic is performed when the setting [OPTA-EN] is On.
GEN.TRIP
From TRC
From
CB-A_OPEN
PROT_COMMON
CB-B_OPEN
CB-C_OPEN
Pushing "CLEAR" key
Settings
Setting items
OPTA-EN
OPTALM
OPTALM
t 0
F/F
≥1
t 0
F/F
≥1
t 0
F/F
100-5000ms
≥1
800000EBB0 OPTA_RESET_COMMAND
Figure 10.3-5 OPTA scheme logics
Table 10.3-7 Setting for OPTA
Range Unit
Off / On - Operating time alarm enable
100 - 5000 ms Definition of certain time
- 724 -
8000001B60
OPTA_FAIL
≥1
F/F
F/F
F/F
Contents
6F2T0200 (0.15)
Default
Off
1000
GRE200 (1,2)