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5.4 SYSTEM SETUP
j) TRANSFORMER THERMAL INPUTS
PATH: SETTINGS
SYSTEM SETUP
THERMAL INPUTS
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, DCmA, or remote RTD input if the ambient temperature is to be mea-
sured directly. Otherwise, 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, DCmA, or remote RTD input for direct measurement of top-oil temperature. If
an RTD or DCmA input is not available, select "Computed".
5
The following menu will be available when
PATH: SETTINGS
SYSTEM SETUP
AMBIENT TEMPERATURE:
Monthly Average
5-90
TRANSFORMER
WINDING CURRENTS:
SRC 1
AMBIENT TEMPERATURE:
MESSAGE
RTD Input 1
TOP-OIL TEMPERATURE:
MESSAGE
RTD Input 1
AMBIENT TEMPERATURE
TRANSFORMER
JANUARY AVERAGE:
–20°C
FEBRUARY AVERAGE:
MESSAGE
–30°C
MARCH AVERAGE:
MESSAGE
–10°C
DECEMBER AVERAGE:
MESSAGE
–10°C
T60 Transformer Protection System
THERMAL INPUTS
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
(or the user-defined name)
Range: RTD Input 1, RTD Input 2,..., RTD Input 8, DCmA
Input 1, DCmA Input 2,..., DCmA Input 8, RRTD
1, RRTD2,..., RRTD 12, Monthly Average
Range: RTD Input 1, RTD Input 2,..., RTD Input 8, DCmA
Input 1, DCmA Input 2,..., DCmA Input 8, RRTD
1, RRTD2,..., RRTD 12, Monthly Average
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
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