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345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S2 SYSTEM SETUP
CHAPTER 6: SETPOINTS
52a CONTACT
Range: Disabled, Contact Input 1
Default: Disabled
Select Contact Input 1 [52a (CI#1)] if connected to breaker auxiliary contact 52a.
52b CONTACT
Range: Disabled, Contact Input 2
Default: Disabled
Select Contact Input 2 [52b (CI#2)] if connected to breaker auxiliary contact 52b.
BKR CONNECTED
Range: Contact Input 5 to 10, Disabled
Default: Disabled
Select a contact input to show whether the breaker is connected (Racked-in, or
disconnect switches switched-on), or disconnected (racked-out, or disconnect switches
switched-off) to the system.
PATH
:
SETPOINTS > S2 SYSTEM SETUP > WNDG 2 BREAKER
52a CONTACT
Range: Disabled, Contact Input 3
Default: Disabled
Select Contact Input 3 [52a (CI#3)] if connected to Winding 2 breaker auxiliary contact
52a.
52b CONTACT
Range: Disabled, Contact Input 4
Default: Disabled
Select Contact Input 4 [52b (CI#4)] if connected to Winding 2 breaker auxiliary contact
52b.
BKR CONNECTED
Range: Contact Input 5 to 10, Disabled
Default: Disabled
Select a contact input to show whether the breaker is connected (Racked-in, or
disconnect switches switched-on), or disconnected (racked-out, or disconnect switches
switched-off) to the system.
NOTE
NOTE:
It is highly recommended to monitor the status of the Winding 1 and Winding 2 breakers
using both breaker auxiliary contacts 52a, and 52b; however using only one of them is also
acceptable.
The breaker status when disconnected from the main power circuit, such by drawout
breaker racking mechanism, or isolated by the associated disconnect switches on a fixed
circuit breaker, is provided by monitoring the contact input setting for “BKR
CONNECTED”.The logic for Breaker Open, and Breaker Close status is shown in the table
below:
Table 3: Breaker open / Breaker closed status logic
52a contact
configured
52b contact
configured
Breaker status
Open
Close
Yes
Yes
52a contact open
52b contact closed
52a contact closed
52b contact open
Yes
No
52a contact open
52a contact closed
No
Yes
52b contact closed
52b contact open
No
No
Status unknown