6–58 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CURRENT ELEMENTS CHAPTER 6: PROTECTION SETPOINTS
SOTF CURRENT PICKUP
Range: 0.05 to 10.00 x CT in steps of 0.01
Default: 2.00 x CT
This setting defines 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 defines this time window where SOTF detection is active after a circuit
breaker closure.
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 defines
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 defines 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
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