GE D90 Plus Instruction Manual page 364

PROTECTION FLEXLOGIC™
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Input Mode
Range: Signed, Absolute
Default: Signed
If this setting value is "Signed", then the FlexElement™ responds directly to the
differential signal. If this setting value is "Absolute", then the FlexElement™ responds to
the absolute value of the differential signal. Sample applications for the absolute input
mode include monitoring the angular difference between two phasors with a
symmetrical limit angle in both directions, monitoring power regardless of its direction,
or monitoring a trend regardless of whether the signal increases of decreases.
Compare Mode
Range: Level, Delta
Default: Level
This setting specifies how the element responds to its operating signal. If this setting
value is "Level", the element responds directly to its operating signal (as defined by the
, Input Minus, and
Input Plus
element responds to the rate of change of its operating signal (as defined by the
and Delta T Units settings).
Direction Type
Range: Over, Under
Default: Over
This setting enables the relay to respond to either high or low values of the operating
signal.
settings). If this setting value if "Delta", the
Input Mode
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
Delta T