GE D90 Plus - Page 250

240 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED PROTECTION ELEMENTS CHAPTER 7: PROTECTION
Figure 205: 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 206: Phase A directional polarization
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