GE D90 Plus Instruction Manual page 226

GROUPED PROTECTION ELEMENTS
Load encroachment settings
216
Figure 189: Power swing detect scheme logic, sheet 2 of 3
Figure 190: Power swing detect scheme logic, sheet 3 of 3
The load encroachment element responds to the positive-sequence voltage and current
and applies the characteristic shown below.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION