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Single-phase center-tapped (or split-phase) transformer has a single-phase input winding and a center-tapped output winding connected to a grounded neutral as seen in the figure below. This model is developed from a three winding single-phase transformer whose polarity of the tertiary winding respect to ground has been inverted to obtain twice the phase-ground voltage between secondary and tertiary.
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Single-phase 3W Transformer
Parameters
Symbol | Description | Unit | |
|---|---|---|---|
ID | Transformer name | unique name | |
Status | Connect/Disconnect status | Initial value 1 (0 for disconnected) | |
Number of Phases | Phase count in use | for this model only 1 phase is accepted | |
Primary winding From | Bus1 | Primary side: Bus 1 | a unique name |
Bus2 | Primary side: Bus 2 | NOT APPLICABLE | |
Bus3 | Primary side: Bus 3 | NOT APPLICABLE | |
V (kV) | Primary winding nominal voltage (phase-to-ground) | kV | |
S_base (kVA) | Nominal power in primary side | kVA | |
Conn. type (*) | Primary winding connection type | for this model only ‘wye’ connection is accepted | |
Secondary winding To | Bus1 | Secondary side: Bus 1 | a unique name |
Bus2 | Secondary side: Bus 2 | NOT APPLICABLE | |
Bus3 | Secondary side: Bus 3 | NOT APPLICABLE | |
V (kV) | Secondary winding nominal voltage (phase-to-ground) | kV | |
S_base (kVA) | Nominal power in secondary side | NOT APPLICABLE | |
Conn. type (*) | Secondary winding connection type | for this model only ‘wye’ connection is accepted | |
Tertiary winding To | Bus1 | Tertiary side: Bus 1 | a unique name |
Bus2 | Tertiary side: Bus 2 | NOT APPLICABLE | |
Bus3 | Tertiary side: Bus 3 | NOT APPLICABLE | |
V (kV) | Tertiary winding nominal voltage (phase-to-ground) | kV | |
S_base (kVA) | Nominal power in tertiary side | NOT APPLICABLE | |
Conn. type (*) | Tertiary winding connection type | for this model only ‘wye’ connection is accepted | |
R_12 (p.u.) | Resistance between primary and secondary windings | p.u. | |
Xl_12 (p.u.) | Reactance between primary and secondary windings | p.u. | |
R_23 (p.u.) | Resistance between secondary and tertiary windings | p.u. | |
Xl_23 (p.u.) | Reactance between secondary and tertiary windings | p.u. | |
R_31 (p.u.) | Resistance between primary and tertiary windings | p.u | |
Xl_31 (p.u.) | Reactance between primary and tertiary windings | p.u. | |
Operation | Type of operation: 0 = normal 3W trx, 1 = center-tapped trx | 0 or 1 | |
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