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GE B90 UR Series Instruction Manual Page 193

Low impedance bus differential system.
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5 SETTINGS
For example, assume that B90 IED 4 is used for isolator monitoring while IEDs 1, 2, and 3 are used for protection. Conse-
quently, the
setting of IED 4 must be set to "Logic" while
B90 FUNCTION
"Protection". Normally open and closed auxiliary switches of a given isolator must be wired to the IED 4, and the Isolator
feature must be enabled and configured appropriately.
Assume the isolator shown below is monitored by the Isolator 1 feature. The
and asserted by the isolator 1 monitoring element. This operand must be configured to drive a direct output in order to send
the connection status to IEDs 1, 2, and 3 where the bus replica is being utilized by differential protection. Assume bit 12 of
the message originating at IED 4 is used for this purpose. This is achieved by applying the following settings:
For IED 4:
DIRECT OUTPUT DEVICE ID
DIRECT OUT 12 OPERAND
The above information is to be received by IEDs 1, 2, and 3. Assume direct input 68 is to reflect the isolator position.
For IEDs 1, 2, and 3:
DIRECT INPUT 68 DEVICE
DIRECT INPUT 68 BIT NUMBER
Once received, the isolator 1 status (known on IEDs 1, 2, and 3 as
For IEDs 1, 2, and 3:
BUS 1E CT
BUS 1E STATUS
Figure 5–32: 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. Refer to
the chapter 9 for more details on configuring bus differential zones.
GE Multilin
: "4" (this is the originating device)
: "
ISOLATOR 1 POSITION
: "4" (message received from IED 4)
: "12" (using bit number 12)
: "F7" (the current wired to the F7 terminal)
: "
"
DIRECT INPUT 68 On
ZONE 2
ZONE 1
ISO 1
normally open and closed
auxiliary switches
phase A current, wired to F7
phase B current, wired to F7
phase C current, wired to F7
BUS 1E CT = F7
BUS 1E STATUS = DIRECT INPUT 68 On
B90 Low Impedance Bus Differential System
on the IEDs 1, 2 and 3 must be set to
B90 FUNCTION
ISOLATOR 1 POSITION
" (this operand drives output number 12)
) is used for bus configuration:
DIRECT INPUT 68 On
ISOLATOR 1 POSITION
IED 4
IED 1
IED 2
IED 3
Received as DIRECT
INPUT 68 On
836758A2 CDR
5.3 SYSTEM SETUP
is the FlexLogic™ oper-
5
5-79

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