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Zigzag transformer
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<h2 id="applications">Applications</h2> <p>Zigzag transformers are often required by utilities when connecting three-phase inverters (usually for <a href="/facts/Renewable_energy/6Bu6IrpF">renewable energy</a>) to the grid to provide a stable neutral voltage and prevent excessive phase-to-ground voltages. This also protects the switching devices inside the inverters, which are usually <a href="/facts/Insulated-gate_bipolar_transistor/XRafcaFE">insulated-gate bipolar transistors</a> (IGBTs).<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> </p> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Lawhead, Larry; Hamilton, Randy; Horak, John (May 2006). Three phase transformer winding configurations and differential relay compensation (PDF). 60th Annual Georgia Tech Protective Relay Conference. pp. 8–10. Retrieved 27 December 2015. <a href="http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf" target="_blank">http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Khera, P.P. (October 1990). "Application of zigzag transformers for reducing harmonics in the neutral conductor of low voltage distribution system" (PDF). IEEE Trans. on Industry Applications. doi:10.1109/IAS.1990.152320. <a href="http://www.elistas.net/cgi-bin/eGruposDMime.cgi?K9D9K9Q8L8xumopxC-qjd-uluCRUVPQCvthCnoqdy-qlhhyCQPThfb7" target="_blank">http://www.elistas.net/cgi-bin/eGruposDMime.cgi?K9D9K9Q8L8xumopxC-qjd-uluCRUVPQCvthCnoqdy-qlhhyCQPThfb7</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Sankaran, C. (1 July 2000). "The Basics of Zigzag Transformers". EC&M Magazine. Retrieved 22 February 2012. <a href="https://www.ecmweb.com/content/article/20897030/the-basics-of-zigzag-transformers" target="_blank">https://www.ecmweb.com/content/article/20897030/the-basics-of-zigzag-transformers</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Lawhead, Larry; Hamilton, Randy; Horak, John (May 2006). Three phase transformer winding configurations and differential relay compensation (PDF). 60th Annual Georgia Tech Protective Relay Conference. pp. 8–10. Retrieved 27 December 2015. <a href="http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf" target="_blank">http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Lawhead, Larry; Hamilton, Randy; Horak, John (May 2006). Three phase transformer winding configurations and differential relay compensation (PDF). 60th Annual Georgia Tech Protective Relay Conference. pp. 8–10. Retrieved 27 December 2015. <a href="http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf" target="_blank">http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Lawhead, Larry; Hamilton, Randy; Horak, John (May 2006). Three phase transformer winding configurations and differential relay compensation (PDF). 60th Annual Georgia Tech Protective Relay Conference. pp. 8–10. Retrieved 27 December 2015. <a href="http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf" target="_blank">http://waterheatertimer.org/pdf/Transformer-wiring-configurations.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Post Glover – Zigzag Grounding Transformers <a href="http://www.postglover.com/download/zigzag-grounding-transformers/" target="_blank">http://www.postglover.com/download/zigzag-grounding-transformers/</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Das, J.C. (2002). Short-Circuit Load Flow and Harmonics. CRC Press. pp. 25–28. <a href="https://books.google.com/books?id=AExV1jvJH5AC&pg=PA25" target="_blank">https://books.google.com/books?id=AExV1jvJH5AC&pg=PA25</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Blackburn, J. Lewis, Protective Relaying, Marcel Dekker, Inc., New York, 1998 <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>URJA Techniques (india) Pvt. Ltd. <a href="http://www.earthingtransformers.com/earthing-transformers.html" target="_blank">http://www.earthingtransformers.com/earthing-transformers.html</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"Zig-Zag Transformers". Acutran. Retrieved 2021-02-11. <a href="https://www.acutran.com/product/zig-zag-transformers/" target="_blank">https://www.acutran.com/product/zig-zag-transformers/</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> </ol>