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The Importance of Winding Temperature and Cooling
Paper insulation used in transformers contains organic materials that deteriorate over time
at elevated temperatures. Cooling that is activated too slowly allows elevated temperatures
to degrade this insulation. Cooling systems that are activated too early or too often will lead
to reduced fan and/or oil pump life.
The 509ITM implements advances in thermal modeling technology to increase both
insulation and cooling system life. You can set different parameters for each of the possible
cooling modes, or stages: ONAN, ONAF, OFAF, and ODAF are the designations for natural
convection, forced air, directed air, and oil cooling, respectively.
During operation, the 509ITM can dynamically alter the parameters to match the present
cooling stage being used. You can individually program each winding for accurate
representation of the winding "rise" (gradient). You can also program the winding time
constant and the load current "exponent" for each cooling stage.
More Information
•
Advanced Calculation Setup Method
•
•
Advanced Winding Rise Parameters
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Upper Fields
Advanced CT Temperature Scaling Setup
described below.
Input module
number
Displays the input module number that is being configured with the
advanced “CT, Temperature” scaling parameters.
Input signal
name
Displays the user-assigned name of the signal that is being configured
with
the advanced “CT, Temperature” scaling parameters.
Oil
temperature
adder
Allows you to select the RTD Input Module that is the selected liquid
temperature measurement being added to the winding rise, for example,
top oil.
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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