IEC 63438:2024适用于为交流和直流电力牵引供电系统提供的电气保护系统。它: -制定铁路特有的保护原则； -描述铁路专用保护系统功能； -规定最低功能要求及其应用的信息性示例； -确定保护制度的限制和剩余风险的可接受性； -规定了设计验证的原则。 本文件适用于: -铁路； -引导式大众运输系统，例如有轨电车、高架和地下铁路、山区铁路、无轨电车系统和使用接触线系统的磁悬浮系统。 本文件也可应用于带有接触线的电气化道路交通，例如卡车-手推车系统。 本文件适用于新的电力牵引供电系统，也可适用于现有系统的变更。 本文件不适用于: -地下矿山牵引系统； -起重机、可运输平台和轨道上的类似运输设备、临时结构（例如展览结构），只要这些不是直接或通过变压器从接触线系统供电，并且不受牵引供电系统的危害； -悬挂式缆车； -缆车； -磁悬浮系统(无接触线系统)； -具有无接触系统的感应电源的铁路； -有埋地接触系统的铁路，该系统只需要在列车下方通电，以确保安全。 本文件不涵盖: -产品的技术要求，例如保护装置； -保护系统维护规则。

IEC 63438:2024 applies to the electrical protection system, provided for AC and DC electric traction power supply systems. It:
– establishes railway specific protection principles;
– describes the railway specific protection system functionality;
– specifies minimum functional requirements and informative examples of their application;
– establishes limitations of the protection system and the acceptability of residual risks;
– specifies principles for design verification.
This document is applicable to:
– railways;
– guided mass transport systems, such as tramways, elevated and underground railways, mountain railways, trolleybus systems, and magnetically levitated systems which use a contact line system.
This document can also be applied to electrified road traffic with a contact line, such as truck-trolley systems.
This document applies to new electric traction power supply systems and can be applied to changes of existing systems.
This document does not apply to:
– underground mine traction systems;
– cranes, transportable platforms and similar transportation equipment on rails, temporary structures (e.g. exhibition structures) in so far as these are not supplied directly or via transformers from the contact line system and are not endangered by the traction power supply system;
– suspended cable cars;
– funicular railways;
– magnetic levitated systems (without a contact line system);
– railways with an inductive power supply without contact system;
– railways with a buried contact system that is required to be energized only below the train to ensure safety.
This document does not cover:
– technical requirements for products, e.g. protection devices;
– rules for maintenance of protection systems.