ECN Forum Forums Technical Discussion Technical Reference Area Transformers & Feeders: 3 Phase 3 Wire Wye

Transformers & Feeders: 3 Phase 3 Wire Wye

Five Drawings of Transformer Setups (Connection Schemes);
Primary and Secondary Feeders, Plus OCPDs and Panelboards for:
3 Phase 3 Wire Wye Transformers
(Single Voltage SDS)
NOTE: Click on Image to view Full-Sized Image

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Drawing 3PH3WY-1: 480V x 208V 3 Phase 3 Wire Wye - Star Point Grounded
(Max. Voltage To Ground = 120V; no Grounded Conductor)
Single Panelboard fed by Secondary Feeders:
No Secondary OCPD (Secondary Feeders Protected by Primary OCPD).


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Drawing 3PH3WY-2: 480V x 208V 3 Phase 3 Wire Wye - Star Point Grounded
(Max. Voltage To Ground = 120V; no Grounded Conductor)
Single Panelboard fed by Secondary Feeders:
With Secondary OCPD at Panelboard.


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Drawing 3PH3WY-3: 480V x 208V 3 Phase 3 Wire Wye - Star Point Grounded
(Max. Voltage To Ground = 120V; no Grounded Conductor)
Two Panelboards fed via Tapped Feeder:
With Secondary OCPD at each Panelboard.


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Drawing 3PH3WY-4: 480V x 208V 3 Phase 3 Wire Wye - Star Point Grounded
(Max. Voltage To Ground = 120V; no Grounded Conductor)
Two separate Panelboards fed by Secondary Feeders- each set derived from "X" Terminals.
No Secondary OCPD (Secondary Feeders Protected by Primary OCPD).


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Drawing 3PH3WY-5: 480V x 208V 3 Phase 3 Wire Wye - Star Point Grounded
(Max. Voltage To Ground = 120V; no Grounded Conductor)
Distribution Panel fed by Secondary Feeders. No Main OCPD at Distribution Panel
(Secondary Feeders Protected by Primary OCPD).


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Text #1: Single Voltage SDS - Primary & Secondary OCPDs
(Click on Image to view Full-Sized Image)


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Text #2: Single Voltage SDS - Primary OCPD ONLY
(Click on Image to view Full-Sized Image)



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