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MEASURING RELAYS AND PROTECTION EQUIPMENT - PART 121: FUNCTIONAL REQUIREMENTS FOR DISTANCE PROTECTION
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Available format(s): Hardcopy, PDF
Language(s): English
Published date: 01-01-2014
Publisher: Comitato Elettrotecnico Italiano
FOREWORD1. Scope2. Normative references3. Terms and definitions4. Specification of the function5. Performance specifications6. Functional tests7. Documentation requirementsAnnex A (informative) - Impedance characteristicsAnnex B (informative) - Informative guide for the behaviour of timers in distance protection zones for evolving faultsAnnex C (normative) - Setting exampleAnnex D (normative) - Calculation of mean, median and modeAnnex E (informative) - CT saturation and influence on the performance of distance RelaysAnnex F (informative) - Informative guide for testing distance relays based on CT requirements specificationAnnex G (informative) Informative guide for dimensioning of CTs for distance protectionAnnex H (normative) - Calculation of relay settings based on generic point P expressed in terms of voltage and currentAnnex I (normative) - Ramping methods for testing the basic characteristic accuracyAnnex J (normative) - Definition of fault inception angleAnnex K (normative) - Capacitive voltage instrument transformer modelAnnex ZA (normative) - Normative references to international publications with their corresponding European publications
Describes the 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.
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