CEI 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
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
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