page_80

< previous page | page_80 | next page >

Page 80

| Figure 5-12 Two, single-phase transformers additive polarity, connected open Y-open D. |

| Wye-Wye Connection |

| This connection is ordinarily used to supply large single-phase loads together with three-phase loads. Often the neutral of the primary and the neutral of the secondary are connected together electrically, usually in the form of a single conductor, or common neutral. The two halves of the secondary windings are connected in parallel, as shown in Fig. 5-13 providing a source of single-phase 120 volt supply between each of the phases and the neutral and a source of three-phase 208 volt power supply between the three-phase conductors. |

| Figure 5-13 Three, single-phase transformers additive polarity, connected Y-Y. |

< previous page | page_80 | next page >