GE D90 Plus - Flexcurves

380 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CONTROL ELEMENTS CHAPTER 7: PROTECTION
Figure 318: Digital counter logic
FlexCurves
There are four user-programmable FlexCurves available with the D90
Plus
system, labeled A,
B, C, and D.
The curve shapes for the four FlexCurves are derived from the following equations:
Eq. 40
Eq. 41
where
T
operate
is the operate time in seconds
TDM is the multiplier setting
I is the input current
I
pickup
is the value of the pickup current setting
T
flex
is the FlexCurve time in seconds
T
reset
is the reset time in seconds
FlexCurve settings
Select the Settings > Protection > Control > FlexCurves > FlexCurve A menu to access
the FlexCurve A settings. The same group of settings is available for FlexCurves B, C, and D.
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