GE 845 Instruction Manual page 371

CHAPTER 4: SETPOINTS
..\System\Transformer\Thermal Inputs
Setpoints
Winding Currents
Ambient Temperature
January
February
March
April
May
June
July
August
September
October
November
December
Top-Oil Temperature
<< Status Thermal
NOTE:
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
to measure Ambient temperature, select the "Monthly Average" setting, and enter the
approximate average temperature per month in the monthly calendar menu. If Top-
Oil temperature measurement is not available, select the setting "Computed".
Value Unit
CT Bank 1-J1
Monthly Average
-20 ° C
-20 ° C
-20 ° C
7 ° C
15 ° C
25 ° C
30 ° C
30 ° C
20 ° C
17 ° C
14 ° C
9 ° C
Computed
Tap Chan
To change the temperature unit, i.e. Fahrenheit, Celsius go to Setpoints > Device > Front
Panel menu.
The inputs for Ambient Temperature and Top-Oil Temperature from Thermal Inputs menu
include selection of RTDs. The selected RTDs must be programmed, for the temperature to
be measured on the relay and be included in the calculation for hottest-spot winding
temperature.
..\Setpoints\RTD Temperature\RTD 1
Setpoints
Function
Name
Type
Trip Temperature
Trip Pickup Delay
Trip Dropout Delay
Trip Output Relay X
Alarm Function
Alarm Temperature
Alarm Pickup Delay
Alarm Dropout Delay
Alarm Output Relay X
Sensor Open
Block
Events
Targets
RTD 1 RTD 2 RTD 3
MONITORING
Value Unit
Disabled
RTD 1
100 W Platinum
155 º C
2 s
0 s
Do Not Operate
Disabled
130 º C
2 s
0 s
Do Not Operate
None
Off
Enabled
Latched
RTD 4 >>
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