GE D90 Plus Instruction Manual page 223

CHAPTER 7: PROTECTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 189: Effect of blinders on the mho operating characteristic
Figure 190: Power swing detect quadrilateral operating characteristic
The FlexLogic output operands for the power swing detect element are as follows.
Power swing detection operands
POWER SWING 50DD...............................Asserted when the power swing detection element detects a
disturbance other than a power swing.
GROUPED PROTECTION ELEMENTS
213