Flexcurves - GE D90 Plus Instruction Manual

CONTROL ELEMENTS

FlexCurves

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