Design of grounding systems for Tri-Met Portland Westside light rail traction power substations

Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340) Pub Date : 1999-04-15 DOI:10.1109/RRCON.1999.762404

R. S. Thomas, K. Pham

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引用次数: 9

Abstract

The Westside and Hillsboro Light Rail extensions in Portland, Oregon, USA, were open for revenue service in September, 1998. The 18-mile extensions extend the existing Eastside line rail service from downtown Portland to downtown Hillsboro. The alignment includes at-grade street crossings, street-running operation, several fully grade separated sections and a 3-mile tunnel. Primary power is provided by the utilities at 12.5 kV and rectified by 18 mainline traction power substations to deliver 750 DC power to the light rail vehicles. Each substation has three separate grounding systems: (a) an AC ground mat designed per IEEE Std 80-1986 for safe step and touch potentials; (b) a DC ground mat for DC surge arrestor ground; the DC switchgear enclosure is connected to the DC ground mat through a low-resistance grounding scheme; and (c) an isolated ground rod for the utility incoming shields. This paper provides a detailed technical description including grounding calculations for each grounding system. Test and measurement data obtained for the installed grounding systems are presented and discussed.

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波特兰西区轻轨牵引变电站接地系统设计

美国俄勒冈州波特兰市的西区和希尔斯伯勒轻轨支线于1998年9月投入运营。这条18英里长的延伸线将现有的东线铁路服务从波特兰市中心延伸到希尔斯伯勒市中心。这条线路包括地面过街、街道运行、几个完全独立的路段和一条3英里长的隧道。一次电力由公用事业公司提供，电压为12.5千伏，由18个干线牵引变电站进行整流，为轻轨车辆提供750直流电力。每个变电站有三个独立的接地系统:(a)根据IEEE标准80-1986设计的交流接地垫，用于安全步进和接触电位;(b)用于直流避雷器接地的直流地垫;所述直流开关柜外壳通过低阻接地方案与所述直流地垫连接;(c)用于公用设施进线屏蔽的隔离接地棒。本文提供了详细的技术说明，包括每个接地系统的接地计算。介绍并讨论了对已安装的接地系统所获得的测试和测量数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the 1999 ASME/IEEE Joint Railroad Conference (Cat. No.99CH36340)

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