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BS EN 50522:2022 2023

$215.11

Earthing of power installations exceeding 1 kV a.c.

Published By Publication Date Number of Pages
BSI 2023 114
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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 partiesā€™ 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: ā€” rotating electrical machines; ā€” switchgear; ā€” transformers and reactors; ā€” converters; ā€” cables; ā€” wiring systems; ā€” batteries; ā€” capacitors; ā€” earthing systems; ā€” buildings and fences which are part of a closed electrical operating area; ā€” associated protection, control and auxiliary systems; ā€” large air core reactor. NOTE 2 In general, a standard for an item of equipment takes precedence over this document. This document does not apply to the design and erection of earthing systems of any of the following: ā€” overhead and underground lines between separate installations; NOTE 3 The standard, EN 50341 series Overhead lines exceeding AC 1 kV, specifies requirements for the design and erection of earthing systems in overhead lines. ā€” electrified railway tracks and rolling stock; ā€” mining equipment and installations; ā€” fluorescent lamp installations; ā€” installations on ships and off-shore installations; ā€” electrostatic equipment (e.g. electrostatic precipitators, spray-painting units); ā€” test sites; ā€” medical equipment, e.g. medical X-ray equipment. NOTE 4 The scope of this document does not include the requirements for carrying out live working on electrical power installations. NOTE 5 The scope of this document considers safety requirements for HV installations and its influences on LV installations. For electrical installation up to 1 kV, the standard IEC 60364 series applies.

PDF Catalog

PDF Pages PDF Title
2 undefined
3 EN50522{2022}etp
8 1 Scope
9 2 Normative references
10 3 Terms and definitions
17 4 Fundamental requirements
4.1 General requirements
4.2 Electrical requirements
4.2.1 Methods of neutral earthing
4.2.2 Short-circuit current
4.3 Safety criteria
18 4.4 Functional requirements
5 Design of earthing systems
5.1 General
5.2 Dimensioning with respect to corrosion and mechanical strength
5.2.1 Earth electrodes
5.2.2 Earthing conductors
5.2.3 Bonding conductors
19 5.3 Dimensioning with respect to thermal strength
5.3.1 General
5.3.2 Current rating calculation
21 5.4 Dimensioning with regard to touch voltages
5.4.1 Permissible values
22 5.4.2 Measures for the observance of permissible touch voltages
23 5.4.3 Design procedure
25 6 Measures to avoid transferred potential
6.1 Transferred potential from high voltage systems to low voltage systems
6.1.1 High and low voltage earthing systems
6.1.2 LV supply only within HV substations
6.1.3 LV supply leaving or coming to HV substations
6.1.4 LV in the proximity of HV substation
26 6.2 Transferred potentials to telecommunication and other systems
27 7 Construction of earthing systems
7.1 Installation of earth electrodes and earthing conductors
7.2 Lightning and transients
7.3 Measures for earthing on equipment and installations
28 8 Measurements
9 Maintainability
9.1 Inspections
9.2 Measurements
10 Inspection and documentation of earthing systems
29 Annex A (normative)Methods of calculating permissible touch voltages
A.1 Method of calculating permissible touch voltages UTp
30 A.2 Method of calculating prospective permissible touch voltages UvTp
31 A.3 Method of calculating permissible step voltages
32 Annex B (normative)Calculation of Permissible touch voltage UTp, Prospective permissible touch voltage UvTp
B.1 General
B.2 Calculation of permissible touch voltage
B.3 Calculation of the permissible touch voltage UTp curve values of Figure 8
35 B.4 Calculation of prospective permissible touch voltage
37 Annex C (normative)Type and minimum dimensions of earth electrode materials ensuring mechanical strength and corrosion resistance
39 Annex D (normative)Current rating calculation of earthing conductors and earth electrodes
44 Annex E (normative)Description of the recognized specified measures M
47 Annex F (normative)Measures on earthing systems to reduce the effects of high frequency interference
48 Annex G (normative)Detailed measures for earthing of equipment and installations
G.1 Fences around substation installations
49 G.2 Pipes
G.3 Traction rails
G.4 Pole mounted transforming and/or switching installations
50 G.5 Secondary circuits of instrument transformers
51 Annex H (normative)Measuring touch voltages
52 Annex I (informative)Reduction factors related to earth wires of overhead lines and metal sheaths of underground cables
I.1 General
53 I.2 Typical values of reduction factors of overhead lines and cables (50 Hz)
54 I.3 Influence of the resistances to earth on current in cable sheath
55 Annex J (informative)Basis for the design of earthing systems
J.1 Soil resistivity
J.2 Resistance to earth
61 Annex K (informative)Installing the earth electrodes and earthing conductors
K.1 Installation of earth electrodes
K.1.1 Horizontal earth electrodes
K.1.2 Vertical or inclined driven rods
K.1.3 Jointing the earth electrodes
K.2 Installation of earthing conductors
K.2.1 General
K.2.2 Installing the earthing conductors
62 K.2.3 Jointing the earthing conductors
63 Annex L (informative)Measurements for and on earthing systems
L.1 Soil resistivity measurement and analysis
L.1.1 Introduction
L.1.2 Soil resistivity measurement
L.1.2.1 General
L.1.2.2 Wenner Method
64 L.1.2.3 Guidance on appropriate Wenner spacings
L.1.2.4 Sources of error
L.1.2.5 Seasonal variations
L.1.3 Soil resistivity analysis
L.1.3.1 General
L.1.3.2 Uniform soil model
65 L.1.3.3 Two-layer soil model
L.1.3.4 Multi-layer soil model
L.2 Measurement of resistances to earth and impedances to earth
67 L.3 Determination of the earth potential rise
68 L.4 Measurements of touch voltage and prospective touch voltage
72 L.5 Elimination of interference and disturbance voltages for earthing measurements
73 Annex M (informative)The use of reinforcing bars in concrete for earthing purpose
74 Annex N (informative)Global Earthing System
75 Annex O (normative)Special national conditions
76 Annex P (informative)A-deviations
88 Blank Page
BS EN 50522:2022 2023
$215.11