GE 850 - Page 469

CHAPTER 7: MONITORING RTD TEMPERATURE
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–49
Figure 7-27: RTD Protection logic diagram
894118A3.cdr
SETPOINT
Configurable
Trip Function
Disabled Trip
SETPOINT
Block
Off=0
AND
SETPOINT
Latched Alarm Alarm Function
Disabled
Alarm
OR
AND
RUN
Trip Temperature
SETPOINT
Trip Pickup Delay
SETPOINTS
Trip Dropout Delay
t
PKP
t
RST
Alarm Pickup Delay
SETPOINTS
Alarm Dropout Delay
t
PKP
t
RST
AND
LED: TRIP
LED: Alarm
AND AND
OR
LATCH
S R
RESET
Command
RTD 1 (Trip)PKP
FLEXLOGIC OPERANDS
RTD 1 (Trip)OP
RTD 1 Alarm PKP
FLEXLOGIC OPERANDS
RTD 1 Alarm OP
SETPOINT
Trip Output Relay X
Do Not Operate, Operate
SETPOINT
Alarm Output Relay X
Do Not Operate,Operate
OR
tº ≥ Trip Temperature
RUN
Alarm Temperature
SETPOINT
Tº ≥ Alarm Temperature
Resistance-
Temperature
Convertion
Name RTD 1
Type
SETPOINT
SETPOINT
AN D
RUN RUN
R 250°C R -40°C
◊
Temperature Display: (Celsius, Fahrenheit)
Setpoints/Device/Front
Panel/Display Properties
OR
AND
From other
RTD
for voting
RTD 1 Shorted
FLEXLOGIC OPERANDS
RTD 1 Open
ACTUAL VALUES
RTD 1 Temperature
≤
LED:
Pickup
OR
To all Output Relays
selected to trip Xfmr
(850: Feeder) breakers
OR