GE D90 Plus Instruction Manual page 449

CHAPTER 8: AUTOMATION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Operate Time
Range: 0.000 to 2.000 seconds in steps of 0.001
Default: 0.070 seconds
This setting specifies a timer that is asserted when both the normally open and normally
closed disconnect indications are reset. When the timer expires, a bad status is
indicated for the disconnect. This timer setting should be set equal to the normal
operating time for the disconnect.
Discrepancy Time
Range: 0.000 to 2.000 seconds in steps of 0.001
Default: 0.070 seconds
This setting specifies a timer that is asserted when the three disconnect poles are not all
opened or not all closed. This timer setting should be set greater than the longest
expected time for which the three disconnect poles disagree.
Reset Counter
Range: any automation logic operand or shared operand
Default: Off
Assertion of the operand assigned to this setting resets the disconnect operation
counters.
Events
Range: Enabled, Disabled
Default: Enabled
This setting enables and disables the logging of circuit disconnect events in the
sequence of events recorder.
The disconnect 1 configuration logic is shown below. The logic is identical for each
available disconnect.
Figure 364: Disconnect scheme logic, sheet 1 of 4
DISCONNECTS
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