S5 Protection; Overview; Self-Test Warning Relay - GE 750 Instruction Manual

750/760
Feeder Management Relay
Self-Test Warning
Relay

Overview

5–32
There are no user-programmable setpoints associated with the Self-Test Warning
Relay (Output Relay 8). The logic for this relay is shown below:
FIGURE 5–4: Output Relay 8 Self-Test Warning Logic

S5 Protection

a) Description
The relay has a total of six phase, two neutral, one ground, one sensitive ground,
and one negative sequence time overcurrent elements. The programming of the
time-current characteristics of these elements is identical in all cases and will only
be covered in this section. The required curve is established by programming a
Pickup Current, Curve Shape, Curve Multiplier, and Reset Time. The Curve Shape
can be either a standard shape or a user-defined shape programmed with the
FlexCurve™ feature.
Accurate coordination may require changing the time overcurrent characteristics of
particular elements under different conditions. For manual closing or picking up a
cold load, a different time-current characteristic can be produced by increasing the
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S5 Protection
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