本书的目的是介绍应用于工业和商业配电系统规划和设计的可靠性分析基础。 本材料的目标受众主要是咨询工程师、工厂电气工程师和技术人员。 可靠的工业和商业配电系统的设计很重要，因为停电成本很高。在设计新的配电系统时，有必要考虑停电的成本，并有能力使定量A？成本与可靠性？权衡研究。缺乏有关设备可靠性和停电成本的可靠数据阻碍了工程师进行此类研究。 IEEE Std 493的这次修订克服了这些障碍。 本书的作者试图提供足够的信息，以便在工业和商业电力系统上进行可靠性分析，而无需交叉参考其他文本。包括以下内容: 概率法可靠性分析的基本概念 《电力系统可靠性评估基础》 可靠性的经济评估 最近停电数据的成本 ？新的广泛的机械和电气设备可靠性数据？完整的美国陆军工程公司电力可靠性增强计划（PREP）数据库 各种工业配电系统运行配置的可靠性分析示例 7A？24连续功率 电压暂降分析 应急和备用电源 ？评估和提高现有电气系统的可靠性 预防性维护 可靠性和可维护性验证 标准数据收集技术

The objective of this book is to present the fundamentals of reliability analysis applied to the planning and design of industrial and commercial electric power distribution systems. The intended audience for this material is primarily consulting engineers and plant electrical engineers and technicians. The design of reliable industrial and commercial power distribution systems is important because of the high cost associated with power outages. It is necessary to consider the cost of power outages when making design decisions for new power distribution systems as well as to have the ability to make quantitative "cost-versus-reliability" trade-off studies. The lack of credible data concerning equipment reliability and the cost of power outages has hindered engineers in making such studies. This revision of IEEE Std 493 overcomes these obstacles. The authors of this book have attempted to provide sufficient information so that reliability analyses can be performed on industrial and commercial power systems without requiring cross-references to other texts. Included are the following: — Basic concepts of reliability analysis by probability methods — Fundamentals of power system reliability evaluation — Economic evaluation of reliability — Recent cost of power outage data —New extensive mechanical and electrical equipment reliability data—Complete U.S. Army Corp of Engineers Power Reliability Enhancement Program (PREP)database — Examples of reliability analysis of various industrial distribution system operating configurations — 7× 24 continuous power — Voltage sag analysis — Emergency and standby power — Evaluating and improving the reliability of existing electrical system — Preventative maintenance — Reliability and maintainability verification — Standard data collection techniques