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SYSTEM
Breakers
4–120
MIN
BCD bit 6
BCD bit 5
TAP
Input
Input
-Tap
0
0
-Tap
1
0
-Tap
1
0
-Tap
1
0
...
...
...
-Tap
1
1
The status of each winding breaker is detected on the 845 relay by monitoring the state/
states of either one, or preferably two contact inputs. It is highly recommended to monitor
the status of the breaker using both breaker auxiliary contacts 52a, and 52b. However
using only one of them is also acceptable.
The disconnect from the main power breaker (racked-out by the breaker racking
mechanism, or isolated by the associated disconnect switches on a fixed circuit breaker) is
provided by monitoring the contact input "BKR CONNECTED". If the contact input selected
under the "BKR CONNECTED" setpoint is asserted, the breaker is considered connected to
the primary system. When the breaker is determined disconnected, the breaker state is
shown to be neither open, nor closed
Path:
Setpoints > System > Breakers > Breaker 1
Path:
Setpoints > System > Breakers > Breaker 2
BCD bit 4
BCD bit 3
BCD bit 2
Input
Input
Input
0
0
0
0
0
0
0
0
0
0
0
1
...
...
...
1
0
0
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
BCD bit 1
TAP
Input
Position
0
0
0
0
1
-1
0
-2
...
...
1
-19
- Quick Links:
- 845 Order Codes
- Protection
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