GE B90 Instruction Manual page 184

5.3 SYSTEM SETUP
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
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:
Once received, the isolator 1 status (known on IEDs 1, 2, and 3 as
For IEDs 1, 2, and 3:
5
Figure 5–28: 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.
5-66
setting of IED 4 must be set to "Logic" while
: "4" (this is the originating device)
: "
ISOLATOR 1 POSITION
: "4" (message received from IED 4)
DIRECT INPUT 68 DEVICE
: "12" (using bit number 12)
DIRECT INPUT 68 BIT NUMBER
: "F7" (the current wired to the F7 terminal)
BUS 1E CT
: "
DIRECT INPUT 68 On
BUS 1E STATUS
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
B90 Low Impedance Bus Differential System
B90 FUNCTION
ISOLATOR 1 POSITION
" (this operand drives output number 12)
DIRECT INPUT 68 On
"
ZONE 2
ZONE 1
ISOLATOR 1 POSITION
IED 4
IED 1
IED 2
IED 3
Received as DIRECT
INPUT 68 On
BUS 1E CT = F7
BUS 1E STATUS = DIRECT INPUT 68 On
5 SETTINGS
on the IEDs 1, 2 and 3 must be set to
is the FlexLogic™ oper-
) is used for bus configuration:
836758A2 CDR
GE Multilin