Delta-wye transformer

A delta-wye transformer is a type of three-phase electric power transformer design that employs delta-connected windings on its primary and wye/star connected windings on its secondary. A neutral wire can be provided on wye output side. It can be a single three-phase transformer, or built from three independent single-phase units. An equivalent term is delta-star transformer.

Transformers[edit]

One possible *delta-wye transformer* configuration.^[1]

Delta-wye transformers are common in commercial, industrial, and high-density residential locations, to supply three-phase distribution systems.

An example would be a distribution transformer with a delta primary, running on three 11 kV phases with no neutral or earth required, and a star (or wye) secondary providing a 3-phase supply at 415 V, with the domestic voltage of 240 available between each phase and the earthed (grounded) neutral point.

The delta winding allows third-harmonic currents to circulate within the transformer, and prevents third-harmonic currents from flowing in the supply line.^[2]

Delta-wye transformers introduce a 30, 150, 210, or 330 degree phase shift.^[3] Thus they cannot be paralleled with wye-wye (or delta-delta) transformers. However, they can be paralleled with identical configurations and some different configurations of other delta-wye (or wye-delta with some attention) transformers.^{[citation needed]}

References[edit]

^ "Annex D - Three-phase transformer connections" (PDF). IEC. Retrieved 6 January 2013.^{[permanent dead link]}
^ Electrical Transmission and Distribution Reference Book, Westinghouse Electric Corporation, 1964, Chapter 5, table 15.
^ "IEC Standard 60076-1 Edition 2:1993 consolidated with amendment 1:1999" (PDF). IEC. Retrieved 6 January 2013.^{[permanent dead link]}

External links[edit]

[International_Standard_IEC_60076-1_Edition_2:1993_consolidated_with_amendment_1:1999-1] "Annex D - Three-phase transformer connections" (PDF). IEC. Retrieved 6 January 2013.^{[permanent dead link]}

[TANDD-2] Electrical Transmission and Distribution Reference Book, Westinghouse Electric Corporation, 1964, Chapter 5, table 15.

[Annex_D_-_Three-phase_transformer_connections-3] "IEC Standard 60076-1 Edition 2:1993 consolidated with amendment 1:1999" (PDF). IEC. Retrieved 6 January 2013.^{[permanent dead link]}

[1]

[2]

[3]

v t e Transformer topics
Topics	Balun Buchholz relay Bushing Center tap Circle diagram Condition monitoring of transformers Electrical insulation paper Growler High-leg delta Induction regulator Leakage inductance Magnet wire Metadyne Open-circuit test Polarity Pressure relief valve Quadrature booster Resolver Resonant inductive coupling Severity factor Short-circuit test Stacking factor Synchro Tap changer Toroidal inductors and transformers Transformer oil Dissolved gas analysis Transformer oil testing Transformer utilization factor Vector group
Types	Autotransformer Buck–boost transformer Distribution transformer Pad-mounted transformer Delta-wye transformer Energy efficient transformer Amorphous metal transformer Flyback transformer Grounding transformer Instrument transformer Current transformer Voltage transformer Isolation transformer Austin transformer Linear variable differential transformer Parametric transformer Planar transformer Rotary transformer Rotary variable differential transformer Scott-T transformer Solid-state transformer Trigger transformer Variable-frequency transformer Zigzag transformer
Coils	Hybrid coil Induction coil Oudin coil Polyphase coil Repeating coil Tesla coil Trembler coil
Manufacturers	ABB General Electric Mitsubishi Electric ProlecGE Schneider Electric Siemens TBEA

Delta-wye transformer

Transformers[edit]

See also[edit]

References[edit]

External links[edit]

Premium Membership

€4.95

Create a Premium Account quick and easy

Save your Favourite Pages

Listen to any page in Audio

Colour Night Mode