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L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
Output
The outputs from the schemes are:
•
FlexLogic operands that report on the operation of portions of the scheme
•
FlexLogic operand used to re-trip the protected breaker
•
FlexLogic operands that initiate tripping required to clear the faulted zone. The trip output can be sealed-in for an
adjustable period.
•
Target message indicating a failed breaker has been declared
•
Illumination of the front panel Trip LED (and the Phase A, B, or C LED, if applicable)
Main path sequence
Figure 5-122: Breaker failure main path sequence
The current supervision elements reset in less than 0.7 of a power cycle for any multiple of pickup current as shown in the
following figure.
Figure 5-123: Breaker failure overcurrent supervision reset time
Settings
BF1 MODE
— This setting is used to select the breaker failure operating mode: single or three pole.
BF1 USE AMP SUPV
— If set to "Yes," the element is initiated if current flowing through the breaker is above the supervision
pickup level.