GE Multilin
C60 Breaker Protection System
5-183
5 SETTINGS
5.7 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 5–89: 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 C60 UR series
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Page 11: ...GE Multilin C60 Breaker Protection System xi TABLE OF CONTENTS INDEX...
Page 12: ...xii C60 Breaker Protection System GE Multilin TABLE OF CONTENTS...
Page 32: ...1 20 C60 Breaker Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1...
Page 50: ...2 18 C60 Breaker Protection System GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2...
Page 128: ...4 30 C60 Breaker Protection System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4...
Page 394: ...9 4 C60 Breaker Protection System GE Multilin 9 1 FAULT LOCATOR 9 THEORY OF OPERATION 9...
Page 516: ...D 10 C60 Breaker Protection System GE Multilin D 1 OVERVIEW APPENDIXD D...
Page 528: ...E 12 C60 Breaker Protection System GE Multilin E 2 DNP POINT LISTS APPENDIXE E...