GE Multilin
B90 Low Impedance Bus Differential System
5-79
5 SETTINGS
5.3 SYSTEM SETUP
5
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
setting of IED 4 must be set to “Logic” while
B90 FUNCTION
on the IEDs 1, 2 and 3 must be set to
“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
ISOLATOR 1 POSITION
is the FlexLogic™ oper-
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
: “4” (this is the originating device)
DIRECT OUT 12 OPERAND
: “
ISOLATOR 1 POSITION
” (this operand drives output number 12)
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
: “4” (message received from IED 4)
DIRECT INPUT 68 BIT NUMBER
: “12” (using bit number 12)
Once received, the isolator 1 status (known on IEDs 1, 2, and 3 as
DIRECT INPUT 68 On
) is used for bus configuration:
For IEDs 1, 2, and 3:
BUS 1E CT
: “F7” (the current wired to the F7 terminal)
BUS 1E STATUS
: “
DIRECT INPUT 68 On
”
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.
836758A2 CDR
ZONE 2
ZONE 1
ISO 1
normally open and closed
auxiliary switches
ISOLATOR 1 POSITION
s
ent
as
bi
t
no.
12
fr
om
IE
D
no.
4
Received as DIRECT
INPUT 68 On
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
IED 4
IED 1
IED 2
IED 3
Summary of Contents for B90 UR Series
Page 316: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 406: ...B 90 B90 Low Impedance Bus Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 436: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 446: ...D 10 B90 Low Impedance Bus Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
