GE T60 User Manual

GE Multilin T60 Transformer Protection System 5-301
5 SETTINGS 5.7 CONTROL ELEMENTS
5
d) BREAKER RESTRIKE
PATH: SETTINGS  CONTROL ELEMENTS  MONITORING ELEMENTS  BREAKER RESTRIKE 1(2)
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 5–152: 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
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)
current (amps)
OPERATE
834764A1.CDR

GE T60 Specifications

General

Brand	GE
Model	T60
Category	Relays
Language	English