GE D90 Plus, Instruction Manual

Page: 247 / 694

CHAPTER 7: PROTECTION GROUPED PROTECTION ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 237
Figure 201: Phase instantaneous overcurrent 1 scheme logic
Phase directional overcurrent
The phase directional elements (one for each of phases A, B, and C) determine the phase
current flow direction for steady state and fault conditions and can be used to control the
operation of the phase overcurrent elements via the block inputs of these elements.
Figure 202: Phase A directional polarization
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