GE B90 Instruction Manual page 303

CHAPTER 5: SETTINGS GROUPED ELEMENTS
— This setting is used to set the phase current fault detection level. Generally this setting detects the
BF1 AMP LOSET PICKUP
lowest expected fault current on the protected breaker, after a breaker opening resistor is inserted approximately 90% of
resistor current).
Figure 5-76: Breaker failure current supervision logic
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B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-147