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IEC 60076-25-ed.1.0
Power transformers - Part 25: Neutral grounding resistors
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STANDARD published on 23.2.2023
The information about the standard:
Designation standards: IEC 60076-25-ed.1.0
Publication date standards: 23.2.2023
SKU: NS-1135615
The number of pages: 46
Approximate weight : 138 g (0.30 lbs)
Country: International technical standard
Category: Technical standards IEC
The category - similar standards:
Annotation of standard text IEC 60076-25-ed.1.0 :
IEC 60076-25:2023 applies to dry type natural air-cooled resistors, for neutral grounding of transformers and generators, in order to limit the earth fault current in power systems by means of metallic resistive elements. For the purposes of this document, the resistor can be: used alone or in combination with other electrotechnical products not covered by this document, such as (but not limited to): a step-down single-phase transformer, an open triangle or zig-zag transformer (where the neutral point is not available) and a Petersen coil reactor (in order to increase active power contribution to the fault or reduce time constant for proper protection operation or both); designed, manufactured and verified on a one-off basis or fully standardized and manufactured in quantity. Both terms "neutral grounding resistor" (NGR) and "neutral earthing resistor" (NER) can be used. However, for the purposes of this document and in order to avoid any confusion with "neutral earthing reactor" (NER), the term "neutral grounding resistor" (NGR) is used. This document specifies: the characteristics of the NGR; the service conditions requirements for NGRs; the tests and test methods for confirming that these conditions have been met; the requirements relating to marking for NGRs. Annex A provides guidance on how to consider the effect of resistance variation with temperature. LIEC 60076-25:2023 sapplique aux resistances de type sec refroidies par air naturel pour la mise a la terre (MALT) du neutre des transformateurs et des generateurs dans le but de limiter le courant de defaut a la terre dans les reseaux denergie au moyen delements resistifs metalliques. Pour les besoins du present document, la resistance peut etre: utilisee seule ou avec dautres produits electrotechniques non couverts par le present document, notamment: un transformateur abaisseur monophase, un transformateur en triangle ouvert ou en zigzag (ou le point neutre nest pas disponible) et une bobine Petersen (afin daugmenter la contribution de la puissance active au defaut et/ou de reduire la constante de temps pour ameliorer la protection); concue, fabriquee et verifiee a lunite ou entierement normalisee et fabriquee en quantite. En anglais, les deux termes "neutral grounding resistor" (NGR) et "neutral earthing resistor" (NER) peuvent etre utilises pour designer la resistance de mise a la terre du neutre (MALT). Toutefois, pour les besoins du present document et afin deviter toute confusion avec la "reactance de mise a la terre du neutre" (NER, Neutral Earthing Reactor), le terme "neutral grounding resistor" (NGR) est utilise. Le present document specifie: les caracteristiques de la MALT; les exigences de conditions de service des MALT; les essais et les methodes dessai pour confirmer que ces conditions ont ete remplies; les exigences relatives au marquage des MALT. LAnnexe A fournit des recommandations pour prendre en compte limpact de la temperature sur la variation de la resistance.
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