GE B30 Instruction Manual page 425

CHAPTER 5: SETTINGS
φ
BF1 BKR POS1 B / BF1 BKR POS 1
early-type auxiliary switch contact on poles B or C, accordingly. This contact is normally a non-multiplied Form-A contact.
The contact can even be adjusted to have the shortest possible operating time. This setting is valid only for single-pole
breaker failure schemes.
φ
— Selects the FlexLogic operand that represents the protected breaker normal-type auxiliary switch
BF1 BKR POS2 B
contact on pole B (52/a). This can be a multiplied contact. This setting is valid only for single-pole breaker failure schemes.
φ
— This setting selects the FlexLogic operand that represents the protected breaker normal-type auxiliary
BF1 BKR POS2 C
switch contact on pole C (52/a). This can be a multiplied contact. For single-pole operation, the scheme has the same
overall general concept except that it provides re-tripping of each single pole of the protected breaker. The approach
shown in the following single pole tripping diagram uses the initiating information to determine which pole is supposed to
trip. The logic is segregated on a per-pole basis. The overcurrent detectors have ganged settings. This setting is valid only
for single-pole breaker failure schemes.
Upon operation of the breaker failure element for a single pole trip command, a three-pole trip command needs to be
given via output operand
BKR FAIL 1 TRIP
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
φ
— These settings select the FlexLogic operand to represents the protected breaker
C
OP.
Figure 5-111: Single-pole breaker failure initiate logic
GROUPED ELEMENTS
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