Flexcurves - GE 845 Instruction Manual

SYSTEM
Contact Input Z state
SETPOINT
BKR 1 CONNECTED
Contact Input Z=1, Off = 0
SETPOINT
52a CONTACT
Contact input X
SETPOINT
52b CONTACT
Contact input Y
Contact Input X
(BKR 52a state)
Contact Input Y
(BKR 52b status)

FlexCurves

4–122
BKR 1 (2, 3) TRIP RELAY SELECT
Range: Off, Any Output Relay
Default: Relay 1 (2, 9)
Select any output relay from the list, which will be used to trip breaker 1. The default
setting is Relay 1 which is a form-A relay providing trip circuit fail monitoring by voltage.
BKR 1 (2, 3) CLOSE RELAY SELECT
Range: Off, Any Output Relay
Default: Off
Select any output relay to connect to the close coil of the breaker, and be used for
breaker closing.
Figure 4-47: Breaker State Detection logic diagram
FLEXLOGIC OPERANDS
BKR 1 Disconnected
BKR 1 NOT CONFIGURED
RESET
(command)
The relay incorporates four programmable FlexCurves - FlexCurve A, B, C and D. The points
for these curves are defined by the user in the EnerVista program. User-defined curves can
be used for Time Overcurrent protection in the same way as IEEE, IAC, ANSI, and IEC
curves. Each of the four FlexCurves has 120-point settings for entering times to reset and
operate, 40 points for reset (from 0 to 0.98 times the Pickup value) and 80 for operate (from
1.03 to 20 times the Pickup). This data is converted into two continuous curves by linear
interpolation between data points.
Path: Setpoints > System > FlexCurves
FLEXLOGIC OPERANDS
BKR 1 Connected
TARGET MESSAGE
At least one contact programmed
(to Trip and Close output relays )
PB LED: BREAKER CLOSED
PB LED: BREAKER OPENED
30 ms
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
FLEXLOGIC OPERANDS
BKR 1 Closed
FLEXLOGIC OPERANDS
BKR 1 Opened
LED : ALARM
S
FLEXLOGIC OPERANDS
LATCH
BKR 1 Unkwn State
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