DS/EN 50522:2022

Earthing of power installations exceeding 1 kV a.c.

This document is applicable to specify the requirements for the design and erection of earthing systems of electrical installations, in systems with nominal voltage above 1 kV AC and nominal frequency up to and including 60 Hz, so as to provide safety and proper functioning for the use intended.*NOTE 1 – The technical and procedural principles of this document can be applied when 3rd parties’ installations and facilities are planned and/or erected in the vicinity of HV electrical power installations.*For the purpose of interpreting this document, an electrical power installation is considered to be one of the following:*a) substation, including substation for railway power supply;*b) electrical power installations on mast, pole and tower;*switchgear and/or transformers located outside a closed electrical operating area;*c) one (or more) power station(s) located on a single site;*the electrical power installation includes generators and transformers with all associated switchgear and all electrical auxiliary systems. Connections between generating stations located on different sites are excluded;*d) the electrical system of a factory, industrial plant or other industrial, agricultural, commercial or public premises;*e) electrical power installations on offshore facilities for the purpose of generation, transmission, distribution and/or storage of electricity;*f) transition towers/poles between overhead lines and underground lines.*The electrical power installation includes, among others, the following equipment:*– rotating electrical machines;*– switchgear;*– transformers and reactors;*– converters;*– cables;*– wiring systems;*– batteries;*– capacitors;*– earthing systems;*– buildings and fences which are part of a closed electrical operating area;*– associated protection, control and auxiliary systems;*– large air core reactor.*NOTE 2 – In general, a standard for an item of equipment takes precedence over this document.*This document does n ...