GE D90 Plus Instruction Manual page 181

CHAPTER 7: PROTECTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 134: Ground distance zone 2 operation scheme logic
The ground distance scheme logic for zone 1 is shown below.
Figure 135: Ground distance zone 1 scheme logic
The ground distance scheme logic for zone 2 is shown below. The logic is analagous for
zones 3 through 5.
GROUPED PROTECTION ELEMENTS
173