Influence of tertiary stabilizing windings on zero-sequence performance of three-phase three-legged YNynd transformers. Part I: Equivalent circuit models

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• 作者：Angel Ramos^a ; ^{aramosg@gasnatural.com} ; ^{aramosgomez@gmail.com} ; Juan Carlos Burgos^b
• 关键词：Three-winding transformers ; Tertiary stabilizing windings ; Transformer zero-sequence performance ; Onsite zero-sequence impedance measurements ; Transformer equivalent circuits
• 刊名：Electric Power Systems Research
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：144
• 期：Complete
• 页码：32-40
• 全文大小：732 K
• 卷排序：144

文摘

A detailed analysis of the influence of the stabilizing winding on the zero-sequence behavior of three-phase three-legged YNynd transformers is presented. The analysis is based on a complete set of onsite zero-sequence measurements taken in three power transformers with different internal designs. Based on these measurements, the paper assesses the ability of various equivalent circuit models to reproduce zero-sequence performance accurately. Separate T-type zero-sequence equivalent circuits produce a complete and sufficiently accurate description of the zero-sequence behavior of YNynd transformers. These experimental data and results will be of great use in analysis of tank overheating hazard and short-circuit duty in three-phase three-legged YNynd power transformers.