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IEC 60255-121-ed.1.0
Measuring relays and protection equipment - Part 121: Functional requirements for distance protection
STANDARD published on 7.3.2014
The information about the standard:
Designation standards: IEC 60255-121-ed.1.0
Publication date standards: 7.3.2014
SKU: NS-409269
The number of pages: 302
Approximate weight : 937 g (2.07 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC 60255-121-ed.1.0 :
IEC 60255-121:2014 specifies 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. This standard also defines how to document and publish performance tests. This standard covers distance protection function whose operating characteristic can be defined on an impedance plane and includes specification of the protection function, measurement characteristics, phase selection, directionality, starting and time delay characteristics. The test methodologies for verifying performance characteristics and accuracy are included in this standard. The standard defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. It also includes the instrument transformer requirements for the protection function. The general requirements for measuring relays and protection equipment are defined in IEC 60255-1. LIEC 60255-121:2014 specifie les exigences minimales relatives a levaluation fonctionnelle et a levaluation des performances de la fonction de protection de distance typiquement utilisee, sans sy limiter a des applications de lignes dans des systemes electriques triphases avec mise a la terre directe. La presente norme definit egalement comment documenter et editer des essais de qualification. La presente norme couvre la fonction de protection de distance dont la caracteristique de fonctionnement peut etre definie sur un plan dimpedance et inclut la specification de la fonction de protection, les caracteristiques de mesure, la selection de phase, la directionnalite, les caracteristiques de demarrage et de temporisation. Les methodologies dessai pour verifier les caracteristiques de performance et de precision sont incluses dans la presente norme. La norme definit les facteurs dinfluence qui affectent la precision dans des conditions de regime etabli et les caracteristiques de performance pendant des conditions dynamiques. Pour la fonction de protection, elle inclut aussi les exigences relatives aux transformateurs de mesure. Les exigences generales relatives aux relais de mesure et aux equipements de protection sont definies dans la norme CEI 60255-1.
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