P1627 - IEEE Draft Standard for Transient Overvoltage Protection of DC Electrification Systems by Application of DC Surge Arresters
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This standard is a basis for the design and application of dc surge arresters to protect dc electrification system from transient overvoltage caused by lightning and switching surges. Lightning surges can cause high energy transient overvoltages by direct or indirect coupling with dc electrification system. Transient overvoltage protection from lightning and switching surges of various dc transit electrification systems can be achieved by the application of MOV gapless surge arresters. The subject of application of surge arresters to running rails in areas where lightning activity is severe; requires special studies of protection coordination with rail-ground shorting devices (also called voltage limiting devices VLD) and reviews with track circuits applied at the transit system. Such a special study and criteria of 4 selecting VLD is not included in this standard. However, surge arrester applied to running rails in higher keraunic areas has been included and it requires coordination with both the VLD devices, and track circuits applied in the transit system. Many modern light rail and heavy rail transit projects use VLD, although its application can be avoided by implementing other design measures, such as insulated platforms or simply coating vehicle surface with some special insulation. The purpose of installing VLD at dc transit projects is to enhance safety of personnel from the touch potential (rail-ground voltage) appearing at the train vehicle surface. No industry standard on VLD exists today in North America. Only IEC standard EN 50526-2 Draft March 17-2009 covers VLD
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