GE b30, Instruction Manual, Page: 425 / 632

CHAPTER 5: SETTINGS GROUPED ELEMENTS
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-217
5
BF1 BKR POS1
φ
B / BF1 BKR POS 1
φ
C
— These settings select the FlexLogic operand to represents the protected breaker
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.
BF1 BKR POS2
φ
B
— Selects the FlexLogic operand that represents the protected breaker normal-type auxiliary switch
contact on pole B (52/a). This can be a multiplied contact. This setting is valid only for single-pole breaker failure schemes.
BF1 BKR POS2
φ
C
— This setting selects the FlexLogic operand that represents the protected breaker normal-type auxiliary
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 OP
.
Figure 5-111: Single-pole breaker failure initiate logic