GE L90 Instruction Manual page 487

CHAPTER 5: SETTINGS GROUPED ELEMENTS
Figure 5-170: Directional power characteristic
By making the characteristic angle adjustable and providing for both negative and positive values of the minimum
operating power, a variety of operating characteristics can be achieved as presented in the following figure. For example,
section (a) in the figure shows settings for reverse power, while section (b) shows settings for low forward power
applications.
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L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-301