Woodward LS-5 v2 Series - CB Closed Transition Monitoring

4.3.3.8 CB closed transition monitoring
General notes
The breaker transition mode "Closed Transition" usually implies that the transition from
generator to mains is maintained within 100ms. So during the close process the control
has to recognize as fast as possible the moment when both breakers are closed and has
to give out the according breaker open command.
The operator can enable this monitor that in situations in which both breakers remain
closed for more than 100 milliseconds, the last closed breaker is re-opened and the re-
synchronization is locked.
The utility providers usually demand to be no longer parallel than 210ms in failure
situations. The con󰈡gurable response time must be selected so that under 100ms no trip
occurs and the 󰈡nal opening is completed within longest 210ms.
The close transition monitoring is activated, if the monitoring is enabled and the breaker
transition mode "Close transition" is activated.
When the monitor trips and the according breaker monitoring is enabled the re-
synchronization is blocked and the according breaker alarm is indicated. With
acknowledge of this alarm the synchronization will be released again.
Close transfer from CBA to CBB When the CBB is synchronized and the CBA and CBB is
closed, a timer is started. If the feedback of a successful CBA open signal does not come
within the adjustable response time, the CBB will be opened immediately. If this fault
happens and the CBA monitoring is enabled, the LS5 will indicate “CBA fail to open”.
Close transfer from CBB to CBA When the CBA is synchronized and the CBA and CBB is
closed, a timer is started. If the feedback of a successful CBB open signal does not come
within the adjustable response time, the CBA will be opened immediately. If this fault
happens and the CBB monitoring is enabled, the LS5 will indicate “CBB fail to open”
ID Parameter CL Setting range
[Default]
Description
3469 Closed transition
monitoring On/O󰆞
2 Enabling the closed transition monitoring.
[On] Monitoring is enabled.
[O󰆞] Monitoring is disabled.
3470 Closed transition response
time
2 This is the maximal time both breakers are being
allowed to be closed simultaneously.
[0.12] Response time in [ms]
Notes
The utility providers usually demand to be no
longer parallel than 210ms. The con󰈡gurable
response time must be selected so that under 100ms
139LS-5 v2 Series37650
4 Con󰈡guration
4.3 Con󰈡gure Monitoring
Released