GE Multilin
B90 Low Impedance Bus Differential System
5-125
5 SETTINGS
5.6 CONTROL ELEMENTS
5
This element responds to both normally open and normally closed auxiliary contacts of an isolator or a tie-breaker in order
to assert the actual position of the isolator for the dynamic bus image. The element asserts two extra output operands indi-
cating "isolator alarm" (auxiliary contact discrepancy), and "block switching operations in the substation". The operation of
the element is summarized in the following table.
The position of an isolator is indicated by the ISOLATOR N POSITION FlexLogic™ operand (On = Closed, Off = Open).
This operand is used as a circuit connection status for the bus configuration. When "On", the related current is associated
with a given differential zone; when "Off", the current is excluded from differential calculations.
An isolator alarm FlexLogic™ operand, ISOLATOR 1 ALARM, is asserted after a settable time delay if the auxiliary contacts
of the isolator do not match (open-open, closed-closed instead of open-closed or closed-open), yielding an undefined isola-
tor position. The operand may be used to block user-selected protection functions and may be reset manually or remotely
via the resetting input operand.
The ISOLATOR 1 BLOCK operand is asserted as long as the isolator position is invalid. This operand may be used to block
switching operations in the substation. Typically, breakers and isolators that control currents flowing through a given isolator
shall be blocked from operation as long as isolator position is not resolved.
The element is effectively enabled only when
PRODUCT SETUP
B90 FUNCTION
B90 FUNCTION
is set to “Logic”. Refer to
the Chapter 9: Application of Settings for more details on the usage of the Bus Replica element.
•
ISOLATOR 1 OPEN
: This setting specifies a FlexLogic™ operand that represents an auxiliary contact of the monitored
isolator. Typically this setting is a status of an appropriately wired input contact (“On” = isolator open).
•
ISOLATOR 1 CLOSED
: This setting indicates a FlexLogic™ operand that represents an auxiliary contact of the moni-
tored isolator. Typically this setting is a status of an appropriately wired input contact (“On” = isolator closed).
Figure 5–60: TYPICAL ISOLATOR OPEN/CLOSED SETTINGS
•
ISOLATOR 1 ALARM DELAY:
This setting specifies a time delay after which an isolator alarm is issued by asserting
the operand assigned to
ISOLATOR 1 ALARM
. The delay shall be longer than the slowest operation (transition) time of
the isolator.
Table 5–18: ISOLATOR MONITORING LOGIC
ISOLATOR OPEN
AUXILIARY CONTACT
ISOLATOR CLOSED
AUXILIARY CONTACT
ISOLATOR POSITION
ALARM
BLOCK SWITCHING
Off
On
CLOSED
No
No
Off
Off
LAST VALID
After time delay
until acknowledged
Until Isolator
Position is valid
On
On
CLOSED
On
Off
OPEN
No
No
B90
–
+
F7a
F7c
Contact Input F7a On
FLEXLOGIC OPERANDS
Contact Input F7c On
F7b
ISOLATOR 1 OPEN setting =
Contact Input 7a On
IS
OLA
T
O
R
1
ISOLATOR 1 CLOSED setting =
Contact Input 7c On
836743A1.vsd
Содержание B90 UR Series
Страница 28: ...1 20 B90 Low Impedance Bus Differential System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Страница 114: ...4 28 B90 Low Impedance Bus Differential System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 272: ...6 14 B90 Low Impedance Bus Differential System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Страница 316: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 406: ...B 90 B90 Low Impedance Bus Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 436: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 446: ...D 10 B90 Low Impedance Bus Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...