本指南确定并讨论了为室外配电、输电和发电厂变电站提供直接冲程屏蔽的设计程序。在编写本指南的过程中，对防止直接撞击的已知方法进行了研究，并提供了两种广泛使用的方法的信息: a） 经典经验方法 b） 电几何模型 第三种方法涉及非常规避雷针的使用和相关设计方法，也进行了审查。 本指南并不打算包括可能已开发的所有屏蔽方法。本指南也未涉及通过电力或通信线路进入变电站的浪涌防护或人员安全问题。 本指南的用户应充分了解与特定装置设计相关的所有因素，并在应用本文给出的方法时，使用良好的工程判断，尤其是关于被保护设备的重要性和价值。

This guide identifies and discusses design procedures to provide direct stroke shielding of outdoor distribution, transmission, and generating plant substations. Known methods of shielding from direct strokes were investigated during the preparation of this guide, and information is provided on two methods found to be widely used: a) The classical empirical method b) The electrogeometric model A third approach, which involves the use of non-conventional lightning terminals and related design methods, is also reviewed. This guide does not purport to include all shielding methods that may have been developed. The guide also does not address protection from surges entering a substation over power or communication lines or the personnel safety issues. Users of this guide should thoroughly acquaint themselves with all factors that relate to the design of a particular installation and use good engineering judgment in the application of the methods given here, particularly with respect to the importance and value of the equipment being protected.