IEC 62271-103:2021适用于三相交流开关和开关隔离开关，其开关功能具有额定电流和断开电流，适用于室内和室外安装，适用于额定电压在1 kV以上至52 kV（含52 kV）和额定频率在162/3 Hz至60 Hz（含60 Hz）之间。本文件也适用于三相系统上使用的单刀开关。第二版取消并取代了2011年出版的第一版。本版构成技术修订版。 与上一版相比，此版本包括以下重大技术变更: -本文件已与IEC 62271-1:20 17和IEC 62271-102:2018保持一致； -增加了关于断路试验期间开关在电流中断和重击方面的行为的说明；-开关在进行和断开测试后的状况已被澄清； -增加了一个新的资料性附件B，旨在为Ief1和Ief2的计算提供指导； -定义了50 Hz和60 Hz切换测试组合的新规则，并增加了新表（表7）； -使用指定TRV的测试已被修改为符合IEC 62271-100中描述的实践； -已阐明断路试验期间开关的行为，并已定义重击余量的界限； -增加了短路制作试验的说明； -确定机械操作后的真空完整性检查； -用于单相电容测试的所有测试电压已在7.101.7.3.2下分组，并已通过模拟和计算得到确认。

IEC 62271-103:2021 is applicable to three-phase, alternating current switches and switch-disconnectors for their switching function, having making and breaking current ratings, for indoor and outdoor installations, for rated voltages above 1 kV up to and including 52 kV and for rated frequencies from 162/3 Hz up to and including 60 Hz. This document is also applicable to single-pole switches used on three-phase systems. This second edition cancels and replaces the first edition published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
- this document has been aligned with IEC 62271-1:2017 and IEC 62271-102:2018;
- clarifications regarding the behaviour of the switch during breaking tests regarding current interruption and restrikes have been added;
- conditions of the switch after making and breaking tests have been clarified;
- a new informative Annex B intended to provide guidance for the calculation of Ief1 and Ief2 has been added;
- new rules for the combination of 50 Hz and 60 Hz switching tests have been defined and a new table (Table 7) has been added;
- tests with specified TRV have been modified to be in accordance with the practice described in IEC 62271-100;
- the behaviour of the switch during breaking tests has been clarified and boundaries for restrike allowance have been defined;
- explanations for short-circuit making tests have been added;
- vacuum integrity check after mechanical operations has been defined;
- all test voltages for single-phase capacitive testing have been grouped under 7.101.7.3.2 and have been confirmed by simulation and calculation.