I.S. EN 60255-121:2014
Current
The latest, up-to-date edition.
MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 121: FUNCTIONAL REQUIREMENTS FOR DISTANCE PROTECTION
Hardcopy , PDF
English
01-01-2014
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Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
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FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Specification of the function
5 Performance specifications
6 Functional tests
7 Documentation requirements
Annex A (informative) - Impedance characteristics
Annex B (informative) - Informative guide for
the behaviour of timers in distance protection
zones for evolving faults
Annex C (normative) - Setting example
Annex D (normative) - Calculation of mean, median
and mode
Annex E (informative) - CT saturation and influence
on the performance of distance relays
Annex F (informative) - Informative guide for testing
distance relays based on CT requirements specification
Annex G (informative) - Informative guide for
dimensioning of CTs for distance protection
Annex H (normative) - Calculation of relay settings
based on generic point P expressed in terms of
voltage and current
Annex I (normative) - Ramping methods for testing the
basic characteristic accuracy
Annex J (normative) - Definition of fault inception angle
Annex K (normative) - Capacitive voltage instrument
transformer model
Annex ZA (normative) - Normative references to
international publications with their
corresponding European publications
Defines minimum requirements for functional and performance evaluation of distance protection function typically used in, but not limited to, line applications for effectively earthed, three-phase power systems.
| DevelopmentNote |
For CENELEC adoptions of IEC publications, please check www.iec.ch to be sure that you have any corrigenda that may apply. (01/2017)
|
| DocumentType |
Standard
|
| Pages |
314
|
| PublisherName |
National Standards Authority of Ireland
|
| Status |
Current
|
| Standards | Relationship |
| EN 60255-121:2014 | Identical |
| IEC 61869-2:2012 | Instrument transformers - Part 2: Additional requirements for current transformers |
| EN 61869-2 : 2012 | INSTRUMENT TRANSFORMERS - PART 2: ADDITIONAL REQUIREMENTS FOR CURRENT TRANSFORMERS |
| EN 61869-5:2011 | Instrument transformers - Part 5: Additional requirements for capacitor voltage transformers |
| EN 60255-1:2010 | Measuring relays and protection equipment - Part 1: Common requirements |
| IEC 60255-1:1967 | Electrical relays - Part 1: Instantaneous all-or-nothing relays |
| IEC 61869-5:2011 | Instrument transformers - Part 5: Additional requirements for capacitor voltage transformers |
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