GE T60 Instruction Manual page 166

5.3 SYSTEM SETUP
j) TRANSFORMER THERMAL INPUTS
PATH: SETTINGS
THERMAL INPUTS
5
The thermal inputs settings are used for computation of hottest-spot winding temperature, aging factor and accumulated
loss of life.
• WINDING CURRENTS: Enter a source that represents the true winding load currents.
In cases where two or more sets of CTs are associated to the winding and where thermal elements are to be
set (for example, in a breaker-and-a-half scheme), a spare source for current summation from these CTs
NOTE should be used to obtain the total true winding current. Otherwise, select the only source representing the
other winding current.
• AMBIENT TEMPERATURE: Select an RTD or dcmA input if the ambient temperature is to be measured directly. Oth-
erwise, select "Monthly Average" and enter an average temperature for each month of the year if a directly measured
device output is not available (see monthly settings below).
• TOP OIL TEMPERATURE: Select RTD or dcmA input for direct measurement of top-oil temperature. If an RTD or
dcmA input is not available, select the "Computed".
The following menu will be available when
PATH: SETTINGS
AMBIENT TEMPERATURE:
Monthly Average
5-70
Courtesy of NationalSwitchgear.com
SYSTEM SETUP TRANSFORMER
WINDING CURRENTS:
SRC 1
AMBIENT TEMPERATURE:
MESSAGE
RTD Input 1
TOP-OIL TEMPERATURE:
MESSAGE
RTD Input 1
AMBIENT TEMPERATURE
SYSTEM SETUP TRANSFORMER
JANUARY AVERAGE:
–20°C
FEBRUARY AVERAGE:
MESSAGE
–30°C
MARCH AVERAGE:
MESSAGE
–10°C
DECEMBER AVERAGE:
MESSAGE
–10°C
T60 Transformer Management Relay
THERMAL INPUTS
Range: SRC 1, SRC 2, SRC 3, SRC 4
(or the user-defined name)
Range: RTD Input 1,.... RTD Input 8, dcmA Input 1,...,
dcmA Input 8, Monthly Average
Range: RTD Input 1,.... RTD Input 8, dcmA Input 1,...,
dcmA Input 8, Computed
is "Monthly Average".
THERMAL INPUTS AMBIENT TEMPERATURE
Range: –60 to 60°C in steps of 1
Range: –60 to 60°C in steps of 1
Range: –60 to 60°C in steps of 1
↓
Range: –60 to 60°C in steps of 1
5 SETTINGS
GE Multilin