I.S. EN IEC 60255-187-1:2021
Current
The latest, up-to-date edition.
Measuring relays and protection equipment - Part 187-1: Functional requirements for differential protection - Restrained and unrestrained differential protection of motors, generators and transformers(IEC 60255-187-1:2021)
Hardcopy , PDF
English
04-10-2021
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Dates of withdrawal of national standards are available from NSAI.
FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Specification of the function
5 Performance specification
6 Functional tests
7 Documentation requirements
Annex A (informative) Examples of phase (vector) compensation and zero sequence
compensation schemes
Annex B (normative) Calculation of mean, median and mode
Annex C (normative) CT requirements
Annex D (informative) CT saturation and influence on the performance of differential
relays
Annex E (informative) Guidance on dimensioning of CTs for transformer differential
protection
Annex F (informative) Examples of test procedures to determine CT sizing
requirements for differential protection
Annex G (normative) Ramping methods for testing basic characteristic accuracy
Annex H (informative) Example of COMTRADE file for an evolving fault test case
Annex I (normative) Definition of fault inception angle
Bibliography
This part of IEC 60255 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.
Committee |
TC 95
|
DocumentType |
Standard
|
Pages |
432
|
ProductNote |
The date of any NSAI previous adoption may not match the date of its original CEN/CENELEC document. THIS STANDARD IS ALSO REFER TO IEEE Std C37.2-2008
|
PublisherName |
National Standards Authority of Ireland
|
Status |
Current
|
Standards | Relationship |
EN IEC 60255-187-1:2021 | Identical |
IEC 60255-187-1:2021 | Identical |
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