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Homepage>BS Standards>29 ELECTRICAL ENGINEERING>29.120 Electrical accessories>29.120.70 Relays>BS EN IEC 60255-187-1:2021 Measuring relays and protection equipment Functional requirements for differential protection. Restrained and unrestrained differential protection of motors, generators and transformers
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immediate downloadReleased: 2021-09-24
BS EN IEC 60255-187-1:2021 Measuring relays and protection equipment Functional requirements for differential protection. Restrained and unrestrained differential protection of motors, generators and transformers

BS EN IEC 60255-187-1:2021

Measuring relays and protection equipment Functional requirements for differential protection. Restrained and unrestrained differential protection of motors, generators and transformers

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Standard number:BS EN IEC 60255-187-1:2021
Pages:212
Released:2021-09-24
ISBN:978 0 580 93417 9
Status:Standard
DESCRIPTION

BS EN IEC 60255-187-1:2021


This standard BS EN IEC 60255-187-1:2021 Measuring relays and protection equipment is classified in these ICS categories:
  • 29.120.70 Relays
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.