CHAPTER 5: SETTINGS SYSTEM SETUP
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-159
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), use a spare source for current summation from these CTs 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 measured 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 the monthly settings that follow).
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.”
The following menu displays when
AMBIENT TEMPERATURE is “Monthly Average.”
SETTINGS SYSTEM SETUP TRANSFORMER THERMAL INPUTS AMBIENT TEMPERATURE
5.5.5 Breakers
SETTINGS SYSTEM SETUP BREAKERS BREAKER 1(6)
AMBIENT TEMPERATURE:
Monthly Average
JANUARY AVERAGE:
–20°C
Range: –60 to 60°C in steps of 1
FEBRUARY AVERAGE:
–30°C
Range: –60 to 60°C in steps of 1
MARCH AVERAGE:
–10°C
Range: –60 to 60°C in steps of 1
DECEMBER AVERAGE:
–10°C
Range: –60 to 60°C in steps of 1
BREAKER 1
BREAKER 1
FUNCTION: Disabled
Range: Disabled, Enabled
BREAKER1 PUSH BUTTON
CONTROL: Disabled
Range: Disabled, Enabled
BREAKER 1 TAGGING:
Disabled
Range: Disabled, Enabled
BREAKER 1
SUBSTITUTN: Disabled
Range: Disabled, Enabled
BREAKER 1 BYPASS:
Disabled
Range: Disabled, Enabled
BREAKER 1 NAME:
Bkr 1
Range: up to six alphanumeric characters
BREAKER 1 MODE:
3-Pole
Range: 3-Pole, 1-Pole
BREAKER 1 OPEN:
Off
Range: FlexLogic operand
BREAKER 1 BLK OPEN:
Off
Range: FlexLogic operand
BREAKER 1 CLOSE:
Off
Range: FlexLogic operand
BREAKER 1 BLK CLOSE:
Off
Range: FlexLogic operand
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