Breaker Failure (Ansi 50Bf) - GE T60 Instruction Manual

CHAPTER 5: SETTINGS
NEG SEQ DIR OC1 FWD LIMIT ANGLE
direction.
NEG SEQ DIR OC1 FWD PICKUP
threshold applies to zero-sequence or negative-sequence current based on the
specifying this setting, keep in mind that the design uses a positive-sequence restraint technique.
NEG SEQ DIR OC1 REV LIMIT ANGLE
direction.
— Defines the pickup level for the overcurrent unit in the reverse direction. This pickup
NEG SEQ DIR OC1 REV PICKUP
threshold applies to zero-sequence or negative-sequence current based on the
selecting this setting, keep in mind that the design uses a positive-sequence restraint technique.

5.7.11 Breaker failure (ANSI 50BF)

SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  BREAKER FAILURE  BREAKER FAILURE 1(6)
 BREAKER FAILURE 1

T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
— Defines a symmetrical limit angle (in both directions from the ECA) for the forward
— Defines the pickup level for the overcurrent unit in the forward direction. This pickup
— Defines a symmetrical limit angle (in both directions from the ECA) for the reverse
Figure 5-156: Negative-sequence directional OC1 logic
BF1 FUNCTION:

Disabled
BF1 MODE:

3-Pole
BF1 SOURCE:

SRC 1
BF1 USE AMP SUPV:

Yes
BF1 USE SEAL-IN:

Yes
BF1 3-POLE INITIATE:

Off
GROUPED ELEMENTS
setting. When
NEG SEQ DIR OC1 TYPE
setting. When
NEG SEQ DIR OC1 TYPE
Range: Disabled, Enabled
Range: 3-Pole, 1-Pole
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: Yes, No
Range: Yes, No
Range: FlexLogic operand
5
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