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Operating times
For each opening operation and for each of the poles, a recording is made of:
- The date/time of the open command (appearance of current on the control circuit),
- The "Reaction time" (t1) between the open command and the moment where the CB
leaves the "closed" position and the 52a auxiliary contact changes status
- The "Operation time" (t2) between the open command and the moment where the CB
arrives in the "open" position and the 52b auxiliary contact changes status
Similarly, for each closing operation, for each of the phases, a recording is made of:
- The date/time of the close command (appearance of current on the control circuit),
- The "Reaction time" (t1) between the close command and the moment where the CB
leaves the "open" position and the 52b auxiliary contact changes status
- The "Operation time" (t2) between the close command and the moment where the CB
arrives in the "closed" position and the 52a auxiliary contact changes status
The system can then calculate the "Travel time" (t2-t1) during which the circuit breaker
moves, for both opening and closing operations.
The system also calculates the opening contact separation time (ts) which it the "reaction
time" t1 plus the contact separation offset to the 52a contact entered in the setup (time
from 52a to contact separation) – see also section 7.3 further on.
HMI: Settings/Opening
MA-037 - CB Watch 3 Operating Manual
Figure 38 – Operating time measurement
Figure 39 – Contact separation offset
v7.0 - May 2020
Page 29 of 118
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