ECN Forum Forums Technical Discussion Technical Reference Area Transformers & Feeders: 3Ph 4Wire Open Delta

Transformers & Feeders: 3Ph 4Wire Open Delta

Five Drawings of Transformer Setups (Connection Schemes);
Primary and Secondary Feeders, Plus OCPDs and Panelboards for:
3 Phase 4 Wire Open Delta Transformers
(Two Voltage SDS)
NOTE: Click on Image to view Full-Sized Image

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Drawing 3PH4W-OD1: 480V x 120/240V 3 Phase 4 Wire Open Delta - Center Tap Grounded Neutral
(Max. Voltage To Ground = 200V, Nominal = 120V; With Grounded Conductor)
Single Panelboard fed by Secondary Feeders.


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Drawing 3PH4W-OD2: 480V x 120/240V 3 Phase 4 Wire Open Delta - Center Tap Grounded Neutral
(Max. Voltage To Ground = 200V, Nominal = 120V; With Grounded Conductor)
Single Panelboard fed by Secondary Feeders, Additional Panelboard "Subfed".


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Drawing 3PH4W-OD3: 480V x 120/240V 3 Phase 4 Wire Open Delta - Center Tap Grounded Neutral
(Max. Voltage To Ground = 200V, Nominal = 120V;, With Grounded Conductor)
Two Panelboards fed via Tapped Feeder.


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Drawing 3PH4W-OD4: 480V x 120/240V 3 Phase 4 Wire Open Delta - Center Tap Grounded Neutral
(Max. Voltage To Ground = 200V, Nominal = 120V; With Grounded Conductor)
Two separate Panelboards fed by Secondary Feeders- each set derived from "X" Terminals.


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Drawing 3PH4W-OD5: 480V x 120/240V 3 Phase 4 Wire Open Delta - Center Tap Grounded Neutral
(Max. Voltage To Ground = 200V, Nominal = 120V; With Grounded Conductor)
Distribution Panel fed by Secondary Feeders.


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Description Text for above images:

Text #3: Two Voltage SDS - Primary & Secondary OCPDs
(Click on Image to view Full-Sized Image)