IEC 60255-187-1:20 21规定了为检测交流电动机、发电机和变压器故障而设计的（纵向）差动保护的功能和性能评估的最低要求。本文档还定义了如何记录和发布性能测试结果。本文定义了稳态条件下影响精度的影响因素和动态条件下的性能特征。用于验证性能特征和准确性的测试方法也包括在本文件中。 本文件与IEC 60255-187-2和IEC 60255-187-3一起取消并取代IEC 60255-13。本文件包括以下与IEC 60255-13相关的重大技术变更: a)IEC 60255-13进行了重大修订，以遵循保护继电器功能标准（IEC 60255-1xx系列）。IEC 60255-187-1旨在解决电动机、发电机和变压器的约束和非约束差动保护。修订包括功能的详细描述，包括性能规范、测试和文档要求。

IEC 60255-187-1:2021 specifies the minimum requirements for functional and performance evaluation of (longitudinal) differential protection designed for the detection of faults in ac motors, generators and transformers. This document also defines how to document and publish performance test results. This document defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. The test methodologies for verifying performance characteristics and accuracy are also included in this document.
This document, together with IEC 60255-187-2 and IEC 60255-187-3, cancels and replaces IEC 60255-13. This document includes the following significant technical changes with respect to IEC 60255-13:
a) IEC 60255-13 has been significantly revised to follow the common structure of the functional standards for protection relays (IEC 60255-1xx series). IEC 60255-187-1 has been developed to address the restrained and unrestrained differential protection of motors, generators and transformers. The revisions include detailed description of the functions including the performance specification, testing and documentation requirements.