Three Winding Transformer - Specifications Tab

Option Descriptions
Option	Description
Type	Type of transformer (oil, gas, dry, silicone, or vapor). This field is used to determine the rating capacity of the transformer for the power flow overload solution.
Class	Type of cooling used by the transformer. Various combinations of forced air, water and forced oil are available. This field is used to determine the rating capacity of the transformer for the power flow overload solution.
Temp	ANSI temperature rating of the transformer. Various combinations can be chosen and are dependent upon the type of transformer. Dual ratings such as 55/65 increase the overload capability of the transformer by 12 percent.
Form	Either core or shell type transformers can be selected. If Core is selected, the Z0% value on the Impedance tab is set to 0.85 of Z%. If Shell is selected, Z0% is equal to Z%.
Winding Information
Rated kV	Rated kV of a winding. The rated kV can be different than the base kV or the tap kV. EasyPower automatically adjusts the model to account for different taps, turns ratio and bases you choose.
Tap kV / Tap%	Tap kV of a winding. You can also specify the tap kV in terms of percentage of the rated value. If the actual tap kV is not known, enter the rated kV. Load tap changer control can be used to determine final tap settings if desired. EasyPower automatically adjusts the model to account for different taps, turns ratio and bases you select.
MVA/kVA	Self cooled rating of the transformer. Use to select the unit in MVA or kVA.
MVA OL	The overload rating is based on the temperature and class ratings. It is filled in using the Calculate button or you can type in a different rating.

Type

Type of transformer (oil, gas, dry, silicone, or vapor). This field is used to determine the rating capacity of the transformer for the power flow overload solution.

Class

Type of cooling used by the transformer. Various combinations of forced air, water and forced oil are available. This field is used to determine the rating capacity of the transformer for the power flow overload solution.

Temp

ANSI temperature rating of the transformer. Various combinations can be chosen and are dependent upon the type of transformer. Dual ratings such as 55/65 increase the overload capability of the transformer by 12 percent.

Form

Either core or shell type transformers can be selected. If Core is selected, the Z0% value on the Impedance tab is set to 0.85 of Z%. If Shell is selected, Z0% is equal to Z%.

Winding Information

Rated kV

Rated kV of a winding. The rated kV can be different than the base kV or the tap kV. EasyPower automatically adjusts the model to account for different taps, turns ratio and bases you choose.

Tap kV / Tap%

Tap kV of a winding. You can also specify the tap kV in terms of percentage of the rated value. If the actual tap kV is not known, enter the rated kV. Load tap changer control can be used to determine final tap settings if desired. EasyPower automatically adjusts the model to account for different taps, turns ratio and bases you select.

MVA/kVA

Self cooled rating of the transformer. Use to select the unit in MVA or kVA.

MVA OL

The overload rating is based on the temperature and class ratings. It is filled in using the Calculate button or you can type in a different rating.

Three Winding Transformer - Specifications Tab

More Information