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  • BSI
    BS EN IEC 60076-25:2023 Power transformers - Neutral grounding resistors
    Edition: 2023
    $435.35
    / user per year

Description of BS EN IEC 60076-25:2023 2023

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.

Standard NumberBS EN IEC 60076-25:2023
TitlePower transformers - Neutral grounding resistors
StatusDefinitive
Publication Date2023-04-12
Identical National Standard OfEN 60076-25 Ed.1.0, IEC 60076-25 Ed.1.0
DescriptorsPower transformers, Resistors, Ratings, Design, Construction, Tests
ICS29.180 Transformers. Reactors
CommitteePEL/14
ISBN978 0 580 99213 1
PublisherBSI
Pages30

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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