GE T60

GE Multilin T60 Transformer Protection System 5-303
5 SETTINGS 5.7 CONTROL ELEMENTS
5
Figure 5–154: BREAKER RESTRIKE SCHEME LOGIC
e) CT FAILURE DETECTOR
PATH: SETTINGS  CONTROL ELEMENTS  MONITORING ELEMENTS  CT FAILURE DETECTOR
The CT failure function is designed to detect problems with system current transformers used to supply current to the relay.
This logic detects the presence of a zero-sequence current at the supervised source of current without a simultaneous
zero-sequence current at another source, zero-sequence voltage, or some protection element condition.
 CT FAILURE
 DETECTOR
CT FAIL FUNCTION:
Disabled
Range: Disabled, Enabled
MESSAGE
CT FAIL BLOCK:
Off
Range: FlexLogic operand
MESSAGE
CT FAIL 3I0 INPUT 1:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
CT FAIL 3I0 INPUT 1
PKP: 0.2 pu
Range: 0.0 to 2.0 pu in steps of 0.1
MESSAGE
CT FAIL 3I0 INPUT 2:
SRC 2
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
CT FAIL 3I0 INPUT 2
PKP: 0.2 pu
Range: 0.0 to 2.0 pu in steps of 0.1
MESSAGE
CT FAIL 3V0 INPUT:
SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
CT FAIL 3V0 INPUT
PKP: 0.20 pu
Range: 0.00 to 2.00 pu in steps of 0.01
MESSAGE
CT FAIL PICKUP
DELAY: 1.000 s
Range: 0.000 to 65.535 s in steps of 0.001
MESSAGE
CT FAIL TARGET:
Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
CT FAIL EVENTS:
Disabled
Range: Disabled, Enabled
RUN
Current interruption
detection logic
<0.05pu
for > ¼ cycle
I
t
mag
ARMED
RESET
SETTING
= Enabled
BREAKER RESTRIKE 1
FUNCTION
SETTING
=Off
BKR RSTR 1 BLK
AND
SETTING
=IA
BREAKER RESTRIKE 1
SOURCE
=IB
=IC
SETTING
=Off
BKR RSTR 1 BKR OPEN
SETTING
=Off
BKR RSTR 1 OPEN CMD
SETTING
=Off
BKR RSTR 1 CLS CMD
AND
OR
SETTING
BREAKER RESTRIKE 1 PICKUP
RUN
Restrike detection logic
0
T
RST
SETTING
BREAKER RESTRIKE 1
RESET DELAY
0
T
RST
0
T
RST
FLEXLOGIC OPERANDS
BKR RESTRIKE 1 OP A
BKR RESTRIKE 1 OP B
BKR RESTRIKE 1 OP C
BKR RESTRIKE 1 OP
FLEXLOGIC OPERAND
OR
834012A1.CDR