1.1 本实施规程涵盖了测量运行轨道的接地电阻所需遵循的程序，运行轨道用作将列车运行电流返回到电气公共交通系统中的变电站的导体。 1.2 以SI单位表示的值应被视为标准。括号中给出的值仅供参考。 1.3 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。======意义和用途====== 4.1 铁轨与地之间的低电阻可能导致大量杂散地电流，并伴随对地下金属结构的腐蚀损坏。 4.2 这些测量是低电压类型的，并且不设计用于评估轨道绝缘元件的高电压介电特性。 4.3 必须更详细地测试轨对地电阻小于可接受最小值的轨道区段，以确定这种情况的原因。确定任何低轨对地电阻的原因可能需要使用特殊测试技术或特殊仪器，或两者兼而有之，这超出了本规范的范围。 4.4 电气测试要求使用根据成本、制造和通用类型具有不同特性的电表。假设使用本文所含测试程序的任何人将知道如何确定和应用适当的校正因子，并且他们将具有足够的知识以确保所获得的数据的合理准确性。 4.5 本实践并不包括获得轨对地电阻特性的所有可能的现场条件。没有一套通用的测试程序适用于所有情况。

1.1 This practice covers the procedures necessary to follow for measuring resistance-to-earth of the running rails which are used as the conductors for returning the train operating current to the substation in electric mass transit systems. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Low resistance between the rails and earth could result in large magnitudes of stray earth currents with the attendant corrosion damage to underground metallic structures. 4.2 These measurements are of a low voltage type and are not designed to evaluate the high voltage dielectric characteristics of the rail insulating elements. 4.3 Sections of track with rail-to-earth resistances less than acceptable minimums must be tested in greater detail to determine the reason(s) for this condition. Determination of the reason(s) for any low rail-to-earth resistance may require the use of special testing techniques or special instruments, or both, beyond the scope of this practice. 4.4 The electrical tests call for the use of electric meters that have varying characteristics depending on cost, manufacture, and generic type. It is assumed that any person employing the test procedures contained herein will know how to determine and apply proper correction factors and that they will have sufficient knowledge to ensure reasonable accuracy in the data obtained. 4.5 This practice does not encompass all possible field conditions to obtain rail-to-earth resistance characteristics. No general set of test procedures will be applicable to all situations.