Three Winding Transformer - Connection Information

Option Descriptions
Option	Description
Standard	Choose either ANSI or IEC.
ID Name	Uniquely identifies the equipment item. The program automatically assigns a name, but you can change it, if needed. The name can be up to 30 characters long. For three winding transformers, the program automatically assigns the names TW-1, TW-2, TW-3, and so on.
Primary Bus	The bus that is connected to the main transformer winding, or the largest MVA winding. This bus must already exist on the one-line. You must be careful that the Primary Bus has approximately the same base kV as the transformer's Primary Rated kV. (However, EasyPower can model any off-nominal kV rating.) For reference, the Primary Bus base kV is displayed next to the bus name. Only three-phase buses are available to select. The base kV displays line-to-line (LL) voltage.
Secondary Bus	The bus that is connected to the secondary transformer winding. This bus must already exist on the one-line. You must be careful that the Secondary Bus has approximately the same base kV as the transformer's Secondary Rated kV. (However, EasyPower can model any off-nominal kV rating.) For reference, the Secondary Bus base kV is displayed next to the bus name. Only three-phase buses are available to select. The base kV displays line-to-line (LL) voltage.
Tertiary Bus	The bus that is connected to the tertiary transformer winding. This bus must already exist on the one-line. You must be careful that the Tertiary Bus has approximately the same base kV as the transformer's Tertiary Rated kV. (However, EasyPower can model any off-nominal kV rating.) For reference, the Tertiary Bus base kV is displayed next to the bus name. Only three-phase buses are available to select. The base kV displays line-to-line (LL) voltage.
Conn	The transformer winding connection type, which is either "Delta" (D), "Wye Ungrounded" (Y), or "Wye Grounded" (YG). If "Wye Grounded" is selected, grounding impedances can be entered on the Impedance tab in the Grounding section.

Standard

Choose either ANSI or IEC.

ID Name

Uniquely identifies the equipment item. The program automatically assigns a name, but you can change it, if needed. The name can be up to 30 characters long.

For three winding transformers, the program automatically assigns the names TW-1, TW-2, TW-3, and so on.

Primary Bus

The bus that is connected to the main transformer winding, or the largest MVA winding. This bus must already exist on the one-line. You must be careful that the Primary Bus has approximately the same base kV as the transformer's Primary Rated kV. (However, EasyPower can model any off-nominal kV rating.) For reference, the Primary Bus base kV is displayed next to the bus name.

Only three-phase buses are available to select. The base kV displays line-to-line (LL) voltage.

Secondary Bus

The bus that is connected to the secondary transformer winding. This bus must already exist on the one-line. You must be careful that the Secondary Bus has approximately the same base kV as the transformer's Secondary Rated kV. (However, EasyPower can model any off-nominal kV rating.) For reference, the Secondary Bus base kV is displayed next to the bus name.

Only three-phase buses are available to select. The base kV displays line-to-line (LL) voltage.

Tertiary Bus

The bus that is connected to the tertiary transformer winding. This bus must already exist on the one-line. You must be careful that the Tertiary Bus has approximately the same base kV as the transformer's Tertiary Rated kV. (However, EasyPower can model any off-nominal kV rating.) For reference, the Tertiary Bus base kV is displayed next to the bus name.

Only three-phase buses are available to select. The base kV displays line-to-line (LL) voltage.

Conn

The transformer winding connection type, which is either "Delta" (D), "Wye Ungrounded" (Y), or "Wye Grounded" (YG). If "Wye Grounded" is selected, grounding impedances can be entered on the Impedance tab in the Grounding section.

Three Winding Transformer - Connection Information

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