GE Multilin 850

CHAPTER 4: SETPOINTS PROTECTION
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 4–165
SOTF CURRENT PICKUP
Range: 0.05 to 10.00 x CT in steps of 0.01
Default: 2.00 x CT
This setting allows the user to define the SOTF current pickup threshold. Below this
setting the element is not in SOTF condition. To be in SOTF condition, the same phase for
current and voltage have to be in SOTF condition.
SOTF DETECTION WINDOW
Range: 0.000 to 6000.000 s in steps of 0.001
Default: 0.500 s
This setting allows the user to define the SOTF current pickup threshold. Below this
setting the element is not in SOTF condition. To be in SOTF condition, the same phase for
current and voltage have to be in SOTF condition.
EXTERNAL SOTF TRIGGER
Range: Off, Any FlexLogic operand
Default: Off
SOTF can be detected by this logic or by an external logic or device. This setting allows
the user to define the external signal that can also detect the SOTF condition.
PICKUP DELAY
Range: 0.000 to 6000.000 s in steps of 0.001
Default: 0.000 s
This setting allows the user to define a potential delay before trip when SOTF is detected.
FAST PATH:
The current pickup and the pickup delay settings must be defined according to the
potential starting inrush currents and the inrush time upon breaker closure.
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
OUTPUT RELAY X
For details see Common Setpoints
.
EVENTS
Range: Disabled, Enabled
Default: Enabled
TARGETS
Range: Disabled, Self-Reset, Latched
Default: Latched