Breakers - GE T60 Instruction Manual

CHAPTER 5: SETTINGS
The thermal inputs settings are used for computation of hottest-spot winding temperature, aging factor, and accumulated
loss of life.
— Enter a source that represents the true winding load currents.
WINDING 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.
— Select an RTD, DCmA, or remote RTD input if the ambient temperature is to be measured directly.
AMBIENT TEMPERATURE
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).
— Select RTD, DCmA, or remote RTD input for direct measurement of top-oil temperature. If an RTD or
TOP OIL TEMPERATURE
DCmA input is not available, select "Computed."
The following menu displays when
SETTINGS  SYSTEM SETUP  TRANSFORMER  THERMAL INPUTS  AMBIENT TEMPERATURE
AMBIENT TEMPERATURE:
Monthly Average

5.5.5 Breakers

SETTINGS  SYSTEM SETUP  BREAKERS  BREAKER 1(6)
 BREAKER 1

T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
is "Monthly Average."
AMBIENT TEMPERATURE
JANUARY AVERAGE:

–20°C
FEBRUARY AVERAGE:

–30°C
MARCH AVERAGE:

–10°C

DECEMBER AVERAGE:

–10°C
BREAKER 1

FUNCTION: Disabled
BREAKER1 PUSH BUTTON

CONTROL: Disabled
BREAKER 1 NAME:

Bkr 1
BREAKER 1 MODE:

3-Pole
BREAKER 1 OPEN:

Off
BREAKER 1 BLK OPEN:

Off
BREAKER 1 CLOSE:

Off
BREAKER 1 BLK CLOSE:

Off
BREAKER1 ΦA/3P CLSD:

Off
BREAKER1 ΦA/3P OPND:

Off
BREAKER 1 ΦB CLOSED:

Off
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
Range: Disabled, Enabled
Range: Disabled, Enabled
Range: up to six alphanumeric characters
Range: 3-Pole, 1-Pole
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
SYSTEM SETUP
5
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