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S3 PROTECTION
6–58
UNBAL TRIP RESET TIME
Range: 1.00 to 1000.00 s in steps of 0.01 s
Default: 1.00 s
This setting defines the linear reset time of the trip element time accumulator. It is the
maximum reset time from the threshold of tripping based on the unbalance inverse
curve. The reset time has accumulator/integrator to represent thermal memory counter
which increments linearly if the unbalance current is above threshold, and decrements
linearly if it is below threshold. "Unbal DPO" operand is set to high when thermal
memory counter resets to zero.
Figure 6-24: Unbalance inverse time curves
OUTPUT RELAY X
For details see
Common
To select any assignable output relays to operate upon the Unbalance Alarm operation,
assign the Logic Operand "UNBALANCE ALARM OP" or "Any Alarm OP" to a Logic
Element.
BLOCK 1 to 3
For details see
Common
setpoints.
setpoints.
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
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