GE Multilin 345 - Page 224

6–108 345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S6 MONITORING CHAPTER 6: SETPOINTS
Figure 6-47: RTD Protection logic diagram
897828A2.cdr
OR
SETTINGS
SETTING RTD #1 Alarm Enabled = 1 SETTINGS BLOCK 1 Off = 0 BLOCK 2 BLOCK 3 Off = 0 Off = 0
AND
RUN
SETTING
S3 RTD PROTECTION RTD #1 Trip Voting
OR
S3 RTD PROTECTION
RTD #1 Trip Enabled = 1
S3 RTD PROTECTION RTD #1 Alarm Temp RTD #1 Trip Temp
T > 250 C
o
T > Alarm Temp
T > Trip Temp
RUN
T
SETTING S3 RTD PROTECTION RTD #1 Trip Temp
T > 250 C
o
T > Trip Temp
T
AND
OR
RESET Off = 0
SETPOINTS/S4 CONTROLS/ BREAKER CONTROL
RESET LOCKOUT Off = 0
OR
KEYPAD RESET
Logic is shown for RTD #1; other RTDs are similar.
RTD #1 RTD #2 RTD #3 RTD #10 RTD #11 RTD #12
#1 #2 #3 #10 #11 #12
OFF
Setting = Off
Setting = RTD #1
S3 RTD PROTECTION
Disabled = 0 Disabled = 0
SETPOINTS/S4 CONTROLS/ LOCKOUT
AND
LATCH
S R
ASSIGNABLE AUX RELAYS
Operate output relays upon selection
ANDAND
Alarm Pickup Delay
SETPOINTS
Alarm Dropout Delay
t
PKP
t
RST
Trip Pickup Delay Trip Dropout Delay
t
PKP
t
RST
SETPOINTS
LOGIC OPERAND
RTD #1 Alarm OP Any Alarm OP
TARGET MESSAGE
RTD #1 Alarm State: Operate
RTD #1 Trip OP Any Trip OP
RTD #1 Trip State: Trip
RTD #1 Alarm PKP RTD #1 Trip PKP
RTD #1 Alarm State: Pickup RTD #1 Trip
State: Pickup