5-198
F35 Multiple Feeder Protection System
GE Multilin
5.7 CONTROL ELEMENTS
5 SETTINGS
5
A restrike event (FlexLogic operand) is declared if all of the following hold:
•
The current is initially interrupted
•
The breaker status is open
•
An elevated high frequency current condition occurs (if the
BREAKER RESTRIKE 1 HF DETECT
setting is Enabled, other-
wise the condition is bypassed), and
•
The current subsequently drops out again
The algorithm is illustrated in the state machine diagram shown below.
Figure 5–87: 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.
•
BREAKER RESTRIKE 1 HF DETECT
: This setting enables/disables high-frequency (HF) pattern detection when
breaker restrike occurs. High-frequency pattern is typical for capacitor bank, cables, and long transmission line appli-
cations.
Capacitor bank
offline
Current
interruption
(overcurrent)
High-frequency
elevated current
(if enabled)
Restrike detected:
OP state asserted
Breaker close
Breaker
close
Breaker
close
Capacitor bank
online
Current
interruption
(overcurrent)
Breaker open
command or breaker
open state
834768A2.CDR
Summary of Contents for UR F35 Series
Page 10: ...x F35 Multiple Feeder Protection System GE Multilin TABLE OF CONTENTS ...
Page 366: ...5 238 F35 Multiple Feeder Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 426: ...10 12 F35 Multiple Feeder Protection System GE Multilin 10 6 DISPOSAL 10 MAINTENANCE 10 ...
Page 454: ...A 28 F35 Multiple Feeder Protection System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 620: ...F 12 F35 Multiple Feeder Protection System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Page 630: ...H 8 F35 Multiple Feeder Protection System GE Multilin H 3 WARRANTY APPENDIX H H ...
Page 640: ...x F35 Multiple Feeder Protection System GE Multilin INDEX ...