GE B30 UR Series, Instruction Manual

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GE Multilin B30 Bus Differential System 5-99
5 SETTINGS 5.4 SYSTEM SETUP
5
5.4.7 BUS
PATH: SETTINGS

SYSTEM SETUP

BUS

BUS ZONE 1(2)
Two bus differential zones can be configured. The zone is associated with its own bus differential protection element and
CT trouble monitoring element.
The bus differential zone is defined by providing the names of sources whose currents bound the differential zone (refer to
settings
BUS ZONE 1A SOURCE
to
BUS ZONE 1F SOURCE
).
The connection status of a circuit with respect to the protected bus is dynamically provided by FlexLogic operands assigned
to the
BUS ZONE 1A STATUS
to
BUS ZONE 1F STATUS
settings. The selected operand must be ON when the corresponding cir-
cuit is connected to the bus. The operands are selected from the contact inputs that reflect positions of particular circuit
switches and/or breakers. If contact discrepancy filtering is needed, accomplish this using appropriate FlexLogic to form a
Virtual Output, representing the current circuit status. If a given circuit (feeder) is fixed to the protected bus section and can-
not be attached to any other bus section, then use the FlexLogic "ON" operand to represent fixed circuit status.
The status signal is meant to exclude a given current from the bus zone if the circuit is connected to a different bus section
and its non-zero values would upset the current balance causing a spurious differential signal. Therefore, it is not required
nor recommended to use the position of the breaker to control the status signal of a given circuit. If the breaker is opened,
the circuit may remain included in the bus differential zone as the zero current values are measured and used when calcu-
lating the differential signal. Dynamically excluding or including a given current during the breaker operation can cause
undesirable transients and race conditions for the relay algorithm.
If a given circuit cannot be connected to any other bus section different than the protected one, the FlexLogic constant "On"
is recommended for the status signal.

BUS ZONE 1

BUS ZONE 1A SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
MESSAGE
BUS ZONE 1B SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
MESSAGE
BUS ZONE 1C SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
MESSAGE
BUS ZONE 1D SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
MESSAGE
BUS ZONE 1E SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
MESSAGE
BUS ZONE 1F SOURCE:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
MESSAGE
BUS ZONE 1A STATUS:
Off
Range: FlexLogic operand
MESSAGE
BUS ZONE 1B STATUS:
Off
Range: FlexLogic operand
MESSAGE
BUS ZONE 1C STATUS:
Off
Range: FlexLogic operand
MESSAGE
BUS ZONE 1D STATUS:
Off
Range: FlexLogic operand
MESSAGE
BUS ZONE 1E STATUS:
Off
Range: FlexLogic operand
MESSAGE
BUS ZONE 1F STATUS:
Off
Range: FlexLogic operand