logging in or signing up 4 15 04 Reinardo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 3612 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 09, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: Utilitytransformer (13 month(s) ago) That was a very helpful presentation on power substation and distribution transformers. http://www.utilitytransformerbr.com Saving..... Post Reply Close Saving..... Edit Comment Close By: thaithien (32 month(s) ago) Thanks very much !!!! Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Class 25: Class 25 Three-Phase Transformer Connections (cont.)All Three-Phase Transformer Connections: All Three-Phase Transformer ConnectionsDelta-Grounded Wye: Delta-Grounded WyeDelta – Grounded Wye: Delta – Grounded Wye Common substation transformer connection Provides 4-wire grounded wye feeder Isolates LG faults Distribution transformer Used for providing balanced single-phase loading Not good for three-phase motor loadsUngrounded Wye - Delta: Ungrounded Wye - DeltaUngrounded Wye - Delta: Ungrounded Wye - Delta Primary use Supply combination single-phase and three-phase loads Ungrounded wye so that upstream LG fault currents do not flow thru transformers Loss of one transformer will cause single-phasing on three-phase load Really bad if the three-phase load is an induction motor Ungrounded Wye-Delta Serving 1 and 3 Phase Loads Example: Ungrounded Wye-Delta Serving 1 and 3 Phase Loads ExampleHow to determine currents in the delta windings knowing the line currents in an ungrounded wye-delta connection?: How to determine currents in the delta windings knowing the line currents in an ungrounded wye-delta connection?Ungrounded Wye-Delta Example: Ungrounded Wye-Delta ExampleGrounded Wye-Delta: Grounded Wye-DeltaHow to calculate the delta winding currents knowing the line currents in grounded wye-delta connection?: How to calculate the delta winding currents knowing the line currents in grounded wye-delta connection?Grounded Wye - Delta: Grounded Wye - Delta Seldom used Upstream ground faults can flow thru transformers Loss of one transformer and the connection becomes an “open wye-open delta” and will continue to provide three-phase voltages to the three-phase loadOpen Wye – Open Delta: Open Wye – Open DeltaOpen Wye – Open Delta: Open Wye – Open Delta Can supply combination single-phase and three-phase loads “Leading connection” – lighting transformer on leading phase voltage “Lagging connection” – lighting transformer on lagging phase voltage Reduced ratings (chalk board)Leading Open Wye - Open Delta: Leading Open Wye - Open DeltaLagging Open Wye-Open Delta: Lagging Open Wye-Open DeltaOpen Wye - Open Delta Example: Open Wye - Open Delta ExampleLaw of Cosines: Law of CosinesLaw of Cosines Equations: Law of Cosines EquationsHomework: Homework 8.4 8.5 You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
4 15 04 Reinardo Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINTLite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 3612 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: January 09, 2008 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... By: Utilitytransformer (13 month(s) ago) That was a very helpful presentation on power substation and distribution transformers. http://www.utilitytransformerbr.com Saving..... Post Reply Close Saving..... Edit Comment Close By: thaithien (32 month(s) ago) Thanks very much !!!! Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Class 25: Class 25 Three-Phase Transformer Connections (cont.)All Three-Phase Transformer Connections: All Three-Phase Transformer ConnectionsDelta-Grounded Wye: Delta-Grounded WyeDelta – Grounded Wye: Delta – Grounded Wye Common substation transformer connection Provides 4-wire grounded wye feeder Isolates LG faults Distribution transformer Used for providing balanced single-phase loading Not good for three-phase motor loadsUngrounded Wye - Delta: Ungrounded Wye - DeltaUngrounded Wye - Delta: Ungrounded Wye - Delta Primary use Supply combination single-phase and three-phase loads Ungrounded wye so that upstream LG fault currents do not flow thru transformers Loss of one transformer will cause single-phasing on three-phase load Really bad if the three-phase load is an induction motor Ungrounded Wye-Delta Serving 1 and 3 Phase Loads Example: Ungrounded Wye-Delta Serving 1 and 3 Phase Loads ExampleHow to determine currents in the delta windings knowing the line currents in an ungrounded wye-delta connection?: How to determine currents in the delta windings knowing the line currents in an ungrounded wye-delta connection?Ungrounded Wye-Delta Example: Ungrounded Wye-Delta ExampleGrounded Wye-Delta: Grounded Wye-DeltaHow to calculate the delta winding currents knowing the line currents in grounded wye-delta connection?: How to calculate the delta winding currents knowing the line currents in grounded wye-delta connection?Grounded Wye - Delta: Grounded Wye - Delta Seldom used Upstream ground faults can flow thru transformers Loss of one transformer and the connection becomes an “open wye-open delta” and will continue to provide three-phase voltages to the three-phase loadOpen Wye – Open Delta: Open Wye – Open DeltaOpen Wye – Open Delta: Open Wye – Open Delta Can supply combination single-phase and three-phase loads “Leading connection” – lighting transformer on leading phase voltage “Lagging connection” – lighting transformer on lagging phase voltage Reduced ratings (chalk board)Leading Open Wye - Open Delta: Leading Open Wye - Open DeltaLagging Open Wye-Open Delta: Lagging Open Wye-Open DeltaOpen Wye - Open Delta Example: Open Wye - Open Delta ExampleLaw of Cosines: Law of CosinesLaw of Cosines Equations: Law of Cosines EquationsHomework: Homework 8.4 8.5