Flexlogic; Flexlogic Operands - GE B90 Instruction Manual

CHAPTER 5: SETTINGS

FLEXLOGIC

Figure 5-64: Direct input and output sample configuration for dynamic bus replica
In the case of a breaker (or a tie-breaker), a breaker closed position with a dropout time of 40 to 60 ms is typically used as
a connection status to avoid over-tripping or dead zones, depending on the relative position of the breaker and CT. See the
Application of Settings chapter for details on configuring bus differential zones.
5
5.5 FlexLogic

5.5.1 FlexLogic operands

For flexibility, the arrangement of internal digital logic combines fixed and user-programmed parameters. Logic upon
which individual features are designed is fixed, and all other logic, from contact input signals through elements or
combinations of elements to contact outputs, is variable. The user has complete control of all variable logic through
FlexLogic. In general, the system receives analog and digital inputs that it uses to produce analog and digital outputs. The
figure shows major subsystems of a generic UR-series relay involved in this process.
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-123