GE D90 Plus Instruction Manual page 163

Line distance protection system

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Table of Contents

CHAPTER 7: PROTECTION

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

Figure 117: Phase distance configuration window

The following settings are available for each phase distance zone. There are five phase

distance zones of protection in each setting group.

Range: Enabled, Disabled

Default: Enabled

This setting enables and disables the phase distance protection feature.

Range: Forward, Reverse, Non-Directional

Default: Forward

All phase distance zones are reversible. The forward direction is defined by the

setting, whereas the reverse direction is shifted 180° from that angle. The non-

directional zone spans between the forward reach impedance defined by the

settings, and the reverse reach impedance defined by

Range: Mho, Quad

Default: Mho

This setting selects the shape of the phase distance function between the mho and

quadrilateral characteristics. The selection is available on a per-zone basis. The two

characteristics and their possible variations are shown in the following figures.

GROUPED PROTECTION ELEMENTS

Reverse Reach