防雷保护 第2部分：风险管理

[中文适用范围]： 本部分 IEC 62305 适用于由于雷电对地闪击导致的结构风险管理。 其目的是提供一个评估此类风险的程序。一旦选择了风险的上限可容忍限值，该程序提供了一种选择适当保护措施的方法，以将风险降低到或低于可容忍限值。 风险管理还包括评估由于雷电对地闪击引起的浪涌导致内部系统损坏的频率。一旦选择了损坏频率的上限可容忍限值，该程序提供了一种选择适当保护措施的方法，以将损坏频率降低到或低于可容忍限值。 [外文原描述]： IEC 62305-2:2024 is applicable to the risk management of a structure due to lightning flashes to earth. Its purpose is to provide a procedure for the evaluation of such a risk. Once an upper tolerable limit for the risk has been selected, this procedure provides a means for the selection of appropriate protection measures to be adopted to reduce the risk to or below the tolerable limit. This third edition cancels and replaces the second edition, published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) The concept of a single risk, to combine loss of human life and loss due to fire, has been introduced. b) The concept of frequency of damage that can impair the availability of the internal systems within the structure has been introduced. c) The lightning ground strike-point density NSG has been introduced replacing the lightning flash density NG in the evaluation of expected average annual number of dangerous events. d) Reduction of a few risk components can be achieved by the use of preventive temporary measures activated by means of a thunderstorm warning system (TWS) compliant with IEC 62793. The risk of direct strike to people in open areas has been introduced, considering the reduction of that risk using a TWS. The content of the corrigendum 1 (2024-10) has been included in this copy.