GE Multilin
T60 Transformer Protection System
5-255
5 SETTINGS
5.7 CONTROL ELEMENTS
5
d) BREAKER RESTRIKE
PATH: SETTINGS
CONTROL ELEMENTS
MONITORING ELEMENTS
BREAKER RESTRIKE 1(3)
According to IEEE standard C37.100:
IEEE Standard Definitions for Power Switchgear
, restrike is defined as “a resumption
of current between the contacts of a switching device during an opening operation after an interval of zero current of
¼ cycle at normal frequency or longer”.
Figure 5–142: TYPICAL RESTRIKE WAVEFORM AND DETECTION FLAG
The breaker restrike algorithm responds to a successful interruption of the phase current following a declaration of capaci-
tor bank offline as per the breaker pole indication. If a high-frequency current with a magnitude greater than the threshold is
resumed at least ¼ of a cycle later than the phase current interruption, then a breaker restrike condition is declared in the
corresponding phase and the
BRK RESTRIKE 1 OP
operand is asserted for a short period of time. The user can add coun-
ters and other logic to facilitate the decision making process as to the appropriate actions upon detecting a single restrike or
a series of consecutive restrikes.
A restrike event (FlexLogic™ operand) is declared if all of the following hold:
•
The current is initially interrupted.
BREAKER RESTRIKE 1
BREAKER RESTRIKE 1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
BKR RSTR 1 BLOCK:
Off
Range: FlexLogic™ operand
MESSAGE
BREAKER RESTRIKE 1
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
MESSAGE
BREAKER RESTRIKE 1
PICKUP: 0.500 pu
Range: 0.10 to 2.00 pu in steps of 0.01
MESSAGE
BREAKER RESTRIKE 1
RESET DELAY: 0.100 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
BKR RSTR 1 BKR OPEN:
Off
Range: FlexLogic™ operand
MESSAGE
BKR RSTR 1 OPEN CMD:
Off
Range: FlexLogic™ operand
MESSAGE
BKR RSTR 1 CLS CMD:
Off
Range: FlexLogic™ operand
MESSAGE
BREAKER RESTRIKE 1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
BREAKER RESTRIKE 1
EVENTS: Disabled
Range: Disabled, Enabled
0
2
4
6
8
10
–2
–4
–6
–8
–10
0.01
0.02
0.03
0.05
time (ms)
curr
ent
(amps)
OPERATE
834764A1.CDR
Summary of Contents for UR T60
Page 10: ...x T60 Transformer Protection System GE Multilin TABLE OF CONTENTS ...
Page 14: ...xiv T60 Transformer Protection System GE Multilin 0 1 BATTERY DISPOSAL 0 BATTERY DISPOSAL 0 ...
Page 34: ...1 20 T60 Transformer Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 436: ...5 298 T60 Transformer Protection System GE Multilin 5 10 TESTING 5 SETTINGS 5 ...
Page 678: ...C 30 T60 Transformer Protection System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 688: ...D 10 T60 Transformer Protection System GE Multilin D 1 IEC 60870 5 104 PROTOCOL APPENDIX D D ...
Page 700: ...E 12 T60 Transformer Protection System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
