4 15 04

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Education

Published on January 9, 2008

Author: Reinardo

Source: authorstream.com

Class 25:  Class 25 Three-Phase Transformer Connections (cont.) All Three-Phase Transformer Connections:  All Three-Phase Transformer Connections Delta-Grounded Wye:  Delta-Grounded Wye Delta – 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 loads Ungrounded Wye - Delta:  Ungrounded Wye - Delta Ungrounded 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 Example How 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 Example Grounded Wye-Delta:  Grounded Wye-Delta How 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 load Open Wye – Open Delta:  Open Wye – Open Delta Open 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 Delta Lagging Open Wye-Open Delta:  Lagging Open Wye-Open Delta Open Wye - Open Delta Example:  Open Wye - Open Delta Example Law of Cosines:  Law of Cosines Law of Cosines Equations:  Law of Cosines Equations Homework:  Homework 8.4 8.5

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