GE D90 Plus Instruction Manual page 172

GROUPED PROTECTION ELEMENTS
164
Figure 126: Phase distance zone 2 operation scheme logic
The phase distance scheme logic for zone 1 is shown below. The logic is analagous for
zones 2 through 5.
Figure 127: Phase distance scheme logic
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION