Wyes and wye nots of three-phase distribution transformer connections

Papers Presented at the 33rd Annual Conference Rural Electric Power Conference Pub Date : 1989-04-30 DOI:10.1109/REPCON.1989.95535

R.J. Rusch, M. Good

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引用次数: 13

Abstract

The authors summarize the pros and cons of various three-phase transformer connections. Recommendations are provided regarding the standard types of connections a utility should offer for various service requirements. Consideration is given to warehousing costs, ferroresonance, neutral grounding, core construction, overvoltages, unbalanced loading, zero sequence sources, and through faults. Emphasis is placed on the exchange of information between customer and utility. An application for three-phase service form that can be used to determine service requirements, including voltage, grounded, ungrounded, three-phase load, single-phase load, motor characteristics, and fault current interrupting rating of secondary breakers and switchgear, is provided. It is recommended that a rural electric utility standardize on a limited number of transformer connections to serve three-phase loads. Recommended standard connections include: (1) four-wire service, grounded-wye-grounded-wye; and (2) three-wire service, wye-delta. Suggestions on utility-supplied information such as maximum available three-phase and line-to-ground fault currents are provided, and the operation of ungrounded systems is discussed.<>

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三相配电变压器接线的绕线和绕线

作者总结了各种三相变压器接线的优缺点。针对各种服务需求，提供了公用事业应该提供的标准连接类型的建议。考虑到仓储成本、铁磁谐振、中性点接地、铁芯结构、过电压、不平衡负载、零序源和通过故障。重点放在客户和公用事业单位之间的信息交换上。提供了一份三相服务表格申请表，用于确定服务要求，包括电压、接地、不接地、三相负载、单相负载、电机特性以及二次断路器和开关设备的故障电流中断额定值。建议农村电力公司对有限数量的变压器连接进行标准化，以服务三相负载。推荐的标准连接包括:(1)四线制业务，接地-接地-接地;(2)三线制服务，三角式服务。对电力公司提供的信息，如最大可用三相电流和线路对地故障电流，提出了建议，并讨论了不接地系统的运行。

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Papers Presented at the 33rd Annual Conference Rural Electric Power Conference

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