GE D90 Plus Instruction Manual page 247

Line distance protection system

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CHAPTER 7: PROTECTION

Phase directional overcurrent

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

Figure 201: Phase instantaneous overcurrent 1 scheme logic

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

GROUPED PROTECTION ELEMENTS