高压开关设备和控制设备第105部分:额定电压1kV以上52kV及以下交流开关熔断器组合

[中文适用范围]： IEC 62271的这一部分适用于公共和工业配电系统的三极单元，这些单元是开关的功能组件，包括由开关或开关隔离开关和限流熔断器组成的组件，设计用于能够： - 在额定恢复电压下断开任何电流，包括额定短路断开电流； - 在额定电压下接通电路，适用于额定短路断开电流。 它不适用于熔断器断路器、熔断器接触器、电动机电路的组合或包含单个电容器组开关的组合。 它也不适用于熔断器与断路器、接触器或电路开关的组合，或用于电动机电路的组合，或包含单个电容器组开关的组合。 本文件适用于额定电压高于1 kV至52 kV（包括52 kV）的组合，用于50 Hz或60 Hz的三相交流系统。 在本文件中，“组合”一词用于指构成功能组件的组合。每种特定类型的开关和特定类型的熔断器的关联定义了一种开关-熔断器组合类型。实际上，不同类型的熔断器可以与一种类型的开关组合，从而产生具有不同特性的多种组合，特别是关于额定连续电流。此外，出于维护目的，用户应知道可以组合到给定开关的熔断器类型，而不影响对标准的符合性，以及由此产生的组合的相应特性。 开关-熔断器组合由其类型名称和制造商定义的选定熔断器列表（所谓的“熔断器参考列表”）定义。符合本文件的给定组合意味着使用任何一个选定熔断器的组合都证明符合本文件。 熔断器的加入是为了将组合的短路断开额定值扩展到开关单独工作时的范围之外。它们配备了触发器，以便在熔断器操作时自动打开开关的所有三极，并在故障电流值高于熔断器的最小熔化电流但低于最小断开电流时实现正确操作。除了熔断器触发器外，组合还可以配备过电流释放器或并联释放器。 注：在本文件中，术语“熔断器”用于指熔断器或熔断器链路，当文本的一般含义不产生歧义时。 [外文原描述]： IEC 62271-105:2021 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 62271-105:2021 applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches composed of switches or switch-disconnectors and current-limiting fuses designed so as to be capable of - breaking, at the rated voltage, any current up to and including the rated short-circuit breaking current; - making, at the rated voltage, circuits to which the rated short-circuit breaking current applies. This third edition cancels and replaces the second edition published in 2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the document has been updated to be in alignment with the second edition of IEC 62271-1:2017; - rated TRV has been removed (TRV is only a test parameter), as in the latest revision of IEC 62271-100; - differentiation has been introduced between requirements expressed for fulfilling the function expected from a switch-fuse combination, from requirements only relevant when the function is performed by a stand-alone device. The goal is to avoid duplication or conflicts of requirements with a standard dealing with assemblies, when the function is implemented within such an assembly.