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Exponent
(4 fields)
Allows you to enter the exponent parameter used in the temperature
calculation for each of the four Cooling Modes. The exponent describes
the “rise” curve of the winding temperature above the oil temperature.
When installing a 509ITM on older transformers, this information might
be difficult to obtain. In those cases, Qualitrol recommends:
•
For ONAN (natural convection): 1.6
•
For ONAF (natural convection; forced air
−
fans only): 1.6
•
For OFAF (forced oil; forced air
−
fans and pumps): 1.8
•
For ODAF (directed forced oil and forced air): 2.0
Winding Time
Constant
(4 fields)
Allows you to enter a time constant for each of the four cooling modes.
The time constant is defined as the time required to reach 63.2% of the
final winding temperature rise for a specific load increase. The winding
temperature reaches its final value for a given load in approximately five
time constants.
Note:
You can program the 509ITM for up to four cooling modes, including natural
convection. If there are less than four cooling modes, the unused rows should match
the last configured row.
Do not enter zeroes as a value
.
TransLife
TM
Advanced CT Temperature Scaling Setup
parameters that are required if you want to use the Critical Forecast section of the
TransLife
TM
Setup. If you are not using the Critical Forecast feature, leave these parameters
at the default values.
The fields in this section are described below.
Oil Rise
(4 fields)
Allows you to set the temperature rise value of the oil of the transformer
at nominal load. This is derived from the Transformer Heat Run Report
by taking the Oil Rise Temperature over ambient at nominal load and
subtracting the Ambient Test Temperature.
Summary of Contents for 509ITM Series
Page 26: ...26 www qualitrolcorp com Current Input Wiring...
Page 55: ...55 www qualitrolcorp com 3 Continue with the setup procedure...
Page 101: ...101 www qualitrolcorp com...
Page 144: ...144 www qualitrolcorp com The following window will appear...
Page 167: ...167 www qualitrolcorp com The Customer Setup window displays 4 Click Load Tap Changer...
Page 178: ...178 www qualitrolcorp com Appendix...
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