机电式初级继电器.第2部分:可靠性

[中文适用范围]： IEC 61810 的这一部分涵盖了使用适当的统计方法来评估耐久性测试的测试条件和规定，以获得继电器的可靠性特性。本文件适用于被视为不可修理物品（即发生故障后不修理的物品）的机电基本继电器。继电器的使用寿命通常以循环次数 (CTF) 表示。因此，每当 IEC 61649 中使用术语“时间”或“持续时间”时，它们都带有“周期”的含义。然而，对于给定的操作频率，循环数可以转换成相应的时间（例如，故障时间（TTF））。本文件规定了基本继电器的故障标准和由此产生的描述其正常使用可靠性的特性。当满足指定的故障标准时，就会发生继电器故障。由于基本继电器的故障率不能被视为恒定，特别是由于磨损机制，因此测试项目的故障周期通常呈现威布尔分布。本文档提供了计算二参数威布尔分布近似值的数值和图形方法，以及置信下限和使用 WeiBayes 方法确认可靠性值的方法。本文件不涵盖适用增强可靠性验证要求的机电基本继电器程序。注 1：IEC 61810-2-1 中规定了此类可靠性测试程序。特别是，当根据 IEC 62061 和 ISO 13849-1 将机电基本继电器纳入机械安全相关控制系统时，IEC 61810-2-1 定义了制造商提供 B10D 值的程序。注 2：符合 IEC 61810-3 的具有强制引导（机械连接）触点的机电基本继电器可提供符合 ISO 13849-1:2015 的 4.5.3 的高诊断覆盖率。 [外文原描述]： IEC 61810-2:2017 covers test conditions and provisions for the evaluation of endurance tests using appropriate statistical methods to obtain reliability characteristics for relays. This document applies to electromechanical elementary relays considered as non-repaired items (i.e. items which are not repaired after failure). This document does not cover procedures for electromechanical elementary relays where enhanced requirements for the verification of reliability apply. This edition includes the following significant technical changes with respect to the previous edition: - not only graphical but also numerical methods are added; - reduction of number of samples in specified cases; - new subclauses of confidence intervals are added; - the WeiBayes approach is added to facilitate compliance tests (routine test) with lower effort; - annexes have been restructured into an Annex A for data analysis (normative) and Annex B (informative) where various examples of the data analysis are given; - the former Annex C has been incorporated into the modified Annex B; - a new Annex C replaces the old Annex D.