GE T60 Instruction Manual page 422

5.7 CONTROL ELEMENTS
SETTING
BREAKER RESTRIKE 1
FUNCTION
= Enabled
SETTING
BKR RSTR 1 BLK
= Off
SETTING
BREAKER RESTRIKE 1
SOURCE
= IA
= IB
= IC
SETTING
BKR RSTR 1 BKR OPEN
= Off
SETTING
BKR RSTR 1 OPEN CMD
= Off
SETTING
BKR RSTR 1 CLS CMD
= Off
e) CT FAILURE DETECTOR

PATH: SETTINGS CONTROL ELEMENTS
5
 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.
5-286
AND
RUN
ARMED
Current interruption
detection logic
I
< 0.05 pu
mag
t
for > ¼ cycle
OR
AND
Figure 5–152: BREAKER RESTRIKE SCHEME LOGIC

MONITORING ELEMENTS
CT FAIL FUNCTION:
Disabled
CT FAIL BLOCK:
MESSAGE
Off
CT FAIL 3I0 INPUT 1:
MESSAGE
SRC 1
CT FAIL 3I0 INPUT 1
MESSAGE
PKP: 0.2 pu
CT FAIL 3I0 INPUT 2:
MESSAGE
SRC 2
CT FAIL 3I0 INPUT 2
MESSAGE
PKP: 0.2 pu
CT FAIL 3V0 INPUT:
MESSAGE
SRC 1
CT FAIL 3V0 INPUT
MESSAGE
PKP: 0.20 pu
CT FAIL PICKUP
MESSAGE
DELAY: 1.000 s
CT FAIL TARGET:
MESSAGE
Self-reset
CT FAIL EVENTS:
MESSAGE
Disabled
T60 Transformer Protection System
SETTING
SETTING
BREAKER RESTRIKE 1
BREAKER RESTRIKE 1 PICKUP
RESET DELAY
RUN
0
Restrike detection logic
0
0
RESET

CT FAILURE DETECTOR
Range: Disabled, Enabled
Range: FlexLogic operand
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.0 to 2.0 pu in steps of 0.1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.0 to 2.0 pu in steps of 0.1
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: 0.00 to 2.00 pu in steps of 0.01
Range: 0.000 to 65.535 s in steps of 0.001
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
T
RST
FLEXLOGIC OPERANDS
T
BKR RESTRIKE 1 OP A
RST
BKR RESTRIKE 1 OP B
BKR RESTRIKE 1 OP C
T
RST
FLEXLOGIC OPERAND
BKR RESTRIKE 1 OP
OR
834012A1.CDR
GE Multilin