GE Multilin
F60 Feeder Protection System
5-197
5 SETTINGS
5.6 CONTROL ELEMENTS
5
•
The current is initially interrupted.
•
The breaker status is open.
•
An elevated high frequency current condition occurs and the current subsequently drops out again.
The algorithm is illustrated in the state machine diagram shown below.
Figure 5–102: ALGORITHM ILLUSTRATION – STATE MACHINE TO DETECT RESTRIKE
In this way, a distinction is made between a self-extinguishing restrike and permanent breaker failure condition. The latter
can be detected by the breaker failure function or a regular instantaneous overcurrent element. Also, a fast succession of
restrikes will be picked up by breaker failure or instantaneous overcurrent protection.
The following settings are available for each element.
•
BREAKER RESTRIKE 1 FUNCTION
: This setting enable and disables operation of the breaker restrike detection ele-
ment.
•
BRK RSTR 1 BLOCK
: This setting is used to block operation of the breaker restrike detection element.
•
BREAKER RESTRIKE 1 SOURCE
: This setting selects the source of the current for this element. This source must
have a valid CT bank assigned.
•
BREAKER RESTRIKE 1 PICKUP
: This setting specifies the pickup level of the overcurrent detector in per-unit values
of CT nominal current.
•
BREAKER RESTRIKE 1 RESET DELAY
: This setting specifies the reset delay for this element. When set to “0 ms”,
then FlexLogic™ operand will be picked up for only 1/8th of the power cycle.
•
BRK RSTR 1 BRK OPEN
: This setting assigns a FlexLogic™ operand indicating the open position of the breaker. It
must be logic “1” when breaker is open.
•
BRK RSTR 1 OPEN CMD
: This setting assigns a FlexLogic™ operand indicating a breaker open command. It must be
logic “1” when breaker is opened, either manually or from protection logic.
•
BRK RSTR 1 CLS CMD
: This setting assigns a FlexLogic™ operand indicating a breaker close command. It must be
logic “1” when breaker is closed.
Capacitor bank
offline
Current
interruption
(overcurrent)
High-frequency
elevated current
Restrike detected:
OP state asserted
Breaker close
Breaker
close
Breaker
close
Capacitor bank
online
Current
interruption
(overcurrent)
Breaker open
command or breaker
open state
834768A1.CDR
Summary of Contents for F60 UR Series
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Page 30: ...1 20 F60 Feeder Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 48: ...2 18 F60 Feeder Protection System GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Page 126: ...4 30 F60 Feeder Protection System GE Multilin 4 2 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 354: ...5 228 F60 Feeder Protection System GE Multilin 5 9 TESTING 5 SETTINGS 5 ...
Page 382: ...6 28 F60 Feeder Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 398: ...8 8 F60 Feeder Protection System GE Multilin 8 2 FAULT LOCATOR 8 THEORY OF OPERATION 8 ...
Page 414: ...A 14 F60 Feeder Protection System GE Multilin A 1 PARAMETER LIST APPENDIXA A ...
Page 492: ...B 78 F60 Feeder Protection System GE Multilin B 4 MEMORY MAPPING APPENDIXB B ...
Page 530: ...D 10 F60 Feeder Protection System GE Multilin D 1 IEC 60870 5 104 APPENDIXD D ...
Page 542: ...E 12 F60 Feeder Protection System GE Multilin E 2 DNP POINT LISTS APPENDIXE E ...
Page 558: ...x F60 Feeder Protection System GE Multilin INDEX ...