ECN Forum Forums Technical Discussion Technical Reference Area Transformers & Feeders: 3 Ph. 3W. Open Delta

Transformers & Feeders: 3 Ph. 3W. Open Delta 1/2

First Set of Drawings: 3 Phase 3 Wire Open Delta Transformer Setups (Connection Schemes);
Primary and Secondary Feeders, Plus Primary OCPDs and Panelboards
(Single Voltage SDS, Primary & Secondary OCPD)
NOTE: Click on Image to view Full-Sized Image

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Drawing 3PH3W-OD1_PS_OCPD: 480V x 240V 3 Phase 3 Wire Open Delta; Center Tap Grounded
(Max. Voltage To Ground = 200V, Nominal = 120V; no Grounded Conductor)
Single Panelboard fed by Secondary Feeders.
Secondary Feeders Protected by Secondary OCPD at Panelboard.


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Drawing 3PH3W-OD2_PS_OCPD: 480V x 240V 3 Phase 3 Wire Open Delta; Corner Grounded
(Max. Voltage To Ground = 240V, Phase "B" = Grounded Conductor)
Single Panelboard fed by Secondary Feeders.
Secondary Feeders Protected by Secondary OCPD at Panelboard.


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Drawing 3PH3W-OD3_PS_OCPD: 480V x 240V 3 Phase 3 Wire Open Delta; Ungrounded
(Max. Voltage To Ground = 0V, no Grounded Conductor)
Single Panelboard fed by Secondary Feeders.
Secondary Feeders Protected by Secondary OCPD at Panelboard.


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



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Transformers & Feeders: 3 Ph. 3W. Open Delta 2/2

Second Set of Drawings: 3 Phase 3 Wire Open Delta Transformer Setups (Connection Schemes);
Primary and Secondary Feeders, Plus Primary OCPDs and Panelboards
(Single Voltage SDS, Primary OCPD Only)
NOTE: Click on Image to view Full-Sized Image

Drawing 3PH3W-OD1_PRI_OCPD: 480V x 240V 3 Phase 3 Wire Open Delta; Center Tap Grounded
(Max. Voltage To Ground = 200V, Nominal = 120V; no Grounded Conductor)
Single Panelboard fed by Secondary Feeders.
Secondary Feeders Protected by Primary OCPD.


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Drawing 3PH3W-OD2_PRI_OCPD: 480V x 240V 3 Phase 3 Wire Open Delta; Corner Grounded
(Max. Voltage To Ground = 240V, Phase "B" = Grounded Conductor)
Single Panelboard fed by Secondary Feeders.
Secondary Feeders Protected by Primary OCPD.


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Drawing 3PH3W-OD3_PRI_OCPD: 480V x 240V 3 Phase 3 Wire Open Delta; Ungrounded
(Max. Voltage To Ground = 0V, no Grounded Conductor)
Single Panelboard fed by Secondary Feeders.
Secondary Feeders Protected by Primary OCPD.


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


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