Three-Phase Voltage Connections
The Wye configuration for a 480 V generator is given in the following diagrams. The Wye configuration is also known as a “star” configuration.
The terminals must be connected securely. The terminals must also be insulated with a good quality electrical tape.
A generator in the Wye configuration may require a two-thirds pitch winding if the neutral is solidly grounded. Refer to the Specifications, LEBX6693, "Generator Set Installation Drawings" for more information. A floating neutral does not require a two-thirds pitch winding.
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| Illustration 1 | g00626053 |
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Typical Wye Configuration with 60 Hz and 6 Leads | |
Single-Phase Current From a Three-Phase Generator
Three-phase current and single-phase current can be taken simultaneously from a generator that is connected for three-phase service. Connect the load to any two of the three three-phase leads. This will provide single-phase voltage at the same voltage as three-phase voltage.
Connect the load to any phase lead and to the neutral lead of the Wye Configuration. This will produce voltage at 58% of three-phase voltage.
Refer to Operation Section, "Generator Operation" for allowable single-phase loading unbalance.
Single-phase power that is taken from a three-phase source can be a problem. Ensure that the single-phase loading is equally distributed.
Do not exceed the nameplate current rating for any one phase.
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| Illustration 2 | g00626132 |
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Diagram for Single-Phase Voltage with 6 Lead Wye Configuration | |