1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationEarthing of power installations exceeding 1 kV a.c.BS EN 50522:2010Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot
2、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-National forewordThis British Standard is the UK implementation of EN 50522:2010.The UK participation in its preparation was entrusted to Technical CommitteePEL/99, Erection and operation of power installations.A list of
3、 organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited
4、2012ISBN 978 0 580 65019 2ICS 29.120.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 July 2012.Amendments issued since publicationAmd. No. Date Text affectedB
5、RITISH STANDARDBS EN 50522:2010Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EUROPEAN STANDARD EN 50522 NORME EUROPENNE EUROPISCHE NORM November 2010 CENEL
6、EC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide
7、 for CENELEC members. Ref. No. EN 50522:2010 E ICS 29.120.50 Supersedes HD 637 S1:1999 (partially) English version Earthing of power installations exceeding 1 kV a.c. Prises de terre des installations lectriques en courant alternatif de puissance suprieure 1 kV Erdung von Starkstromanlagen mit Nennw
8、echselspannungen ber 1 kV This European Standard was approved by CENELEC on 2010-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date
9、lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under th
10、e responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland,
11、 France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 50522:2010Copyright European Committee for Electrotechnical Standardizati
12、on Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 50522:2010 2 Foreword This European Standard was prepared by the Technical Committee CENELEC TC 99X, Power installations exceeding 1 kV a.c. (1,5 kV d.c.). It was submit
13、ted to formal vote and was accepted by CENELEC as EN 50522 on 2010-11-01. Together with EN 61936-1:2010 this document supersedes HD 637 S1:1999. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held res
14、ponsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-11-01 latest date by which the national standards conflicting with
15、 the EN have to be withdrawn (dow) 2013-11-01 NOTE The text identical with IEC 61936-1 is written in italics. _ BS EN 50522:2010Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without li
16、cense from IHS-,-,- 3 EN 50522:2010 Contents 1 Scope .6 2 Normative references .7 3 Terms and definitions .8 3.1 General definitions .8 3.2 Definitions concerning installations 8 3.3 Definitions concerning safety measures against electric shock .9 3.4 Definitions concerning earthing 9 4 Fundamental
17、requirements 18 4.1 General requirements 18 4.2 Electrical requirements .18 4.3 Safety criteria .19 4.4 Functional requirements .20 5 Design of earthing systems 20 5.1 General 20 5.2 Dimensioning with respect to corrosion and mechanical strength .20 5.3 Dimensioning with respect to thermal strength
18、21 5.4 Dimensioning with regard to touch voltages 23 6 Measures to avoid transferred potential .27 6.1 Transferred potential from High voltage systems to Low voltage systems 27 6.2 Transferred potentials to telecommunication and other systems 28 7 Construction of earthing systems .29 7.1 Installatio
19、n of earth electrodes and earthing conductors .29 7.2 Lightning and transients .29 7.3 Measures for earthing on equipment and installations 30 8 Measurements 30 9 Maintainability .30 9.1 Inspections .30 9.2 Measurements .30 Annex A (normative) Method of calculating permissible touch voltages .31 Ann
20、ex B (normative) Touch voltage and body current .32 B.1 Calculation of permissible touch voltage .32 B.2 Calculation of prospective permissible touch voltage 33 Annex C (normative) Type and minimum dimensions of earth electrode materials ensuring mechanical strength and corrosion resistance 36 Annex
21、 D (normative) Current rating calculation of earthing conductors and earth electrodes .37 Annex E (normative) Description of the recognized specified measures M .41 Annex F (normative) Measures on earthing systems to reduce the effects of high frequency interference 44 Annex G (normative) Detailed m
22、easures for earthing of equipment and installations 45 G.1 Fences around substation installations .45 G.2 Pipes .45 G.3 Traction rails 45 G.4 Pole mounted transforming and/or switching installations 45 G.5 Secondary circuits of instrument transformers 46 BS EN 50522:2010Copyright European Committee
23、for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-EN 50522:2010 4 Annex H (normative) Measuring touch voltages .47 Annex I (informative) Reduction factors related to earth wires of overhea
24、d lines and metal sheaths of underground cables .48 I.1 General .48 I.2 Typical values of reduction factors of overhead lines and cables (50 Hz) 48 Annex J (informative) Basis for the design of earthing systems .50 J.1 Soil resistivity 50 J.2 Resistance to earth 50 Annex K (informative) Installing t
25、he earth electrodes and earthing conductors 54 K.1 Installation of earth electrodes .54 K.2 Installation of earthing conductors .54 Annex L (informative) Measurements for and on earthing systems 56 L.1 Measurement of soil resistivities 56 L.2 Measurement of resistances to earth and impedances to ear
26、th 56 L.3 Determination of the earth potential rise 57 L.4 Elimination of interference and disturbance voltages for earthing measurements 58 Annex M (normative) Details on site inspection and documentation of earthing systems 61 Annex N (informative) The use of reinforcing bars in concrete for earth
27、ing purpose .62 Annex O (informative) Global Earthing System .63 Annex P (normative) Special national conditions .64 Annex Q (informative) A-deviations 65 Figure 1 - Example for the surface potential profile and for the voltages in case of current carrying earth electrodes 14 Figure 2 - Example for
28、currents, voltages and resistances for an earth fault in a transformer substation with low impedance neutral earthing .15 Figure 3 - Essential components of earth fault currents in high voltage systems 17 Figure 4 - Permissible touch voltage 25 Figure 5 - Design of earthing systems, if not part of a
29、 global earthing system (C1 of 5.4.2 ), with regard to permissible touch voltage UTp by checking the earth potential rise UE or the touch voltage UT .26 Figure B.1 - Scheme of the touching circuit 34 Figure B.2 - Examples for curves UvTp = f (tf) for different additional resistances RF = RF1 + RF2 .
30、35 Figure D.1 - Short circuit current density G for earthing conductors and earth electrodes relative to the duration of the fault current tF .38 Figure D.2 - Continuous current ID for earthing conductors 40 Figure J.1 - Resistance to earth of horizontal earth electrodes (made from strip, round mate
31、rial or stranded conductor) for straight or ring arrangement in homogeneous soil .51 Figure J.2 - Resistance to earth of earth rods, vertically buried in homogeneous soil .52 Figure J.3 - Typical values for the resistance to earth of a cable with earth electrode effect depending on the length of the
32、 cable and the soil resistivity.53 Figure L.1 - Example for the determination of the impedance to earth by the heavy-current injection method60 BS EN 50522:2010Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or
33、 networking permitted without license from IHS-,-,- 5 EN 50522:2010 Table 1 - Relevant currents for the design of earthing systems .22 Table 2 - Minimum requirements for interconnection of low voltage and high voltage earthing systems based on EPR limits .28 Table B.1 - Permissible body current IB d
34、epending on the fault duration tf .32 Table B.2 - Total human body impedance ZB related to the touch voltage UT for a current path hand to hand .32 Table B.3 - Calculated values of the permissible touch voltage UTp as a function of the fault duration tf 33 Table B.4 - Assumption for calculations wit
35、h additional resistances 33 Table D.1 - Material constants 37 Table D.2 - Factors for conversion of continuous current from 300 C final temperature to another final temperature .38 Table E.1 - Conditions for the use of recognized specified measures M to ensure permissible touch voltages UTp (see Fig
36、ure 4) .41 Table J.1 - Soil resistivities for frequencies of alternating currents (Range of values, which were frequently measured) 50 BS EN 50522:2010Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networki
37、ng permitted without license from IHS-,-,-EN 50522:2010 6 1 Scope This European Standard 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 a.c. and nominal frequency up to and including 60
38、 Hz, so as to provide safety and proper functioning for the use intended. For the purpose of interpreting this standard, an electrical power installation is considered to be one of the following: a) substation, including substation for railway power supply; b) electrical installations on mast, pole
39、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 installation includes generators and transformers with all associated switchgear and all electrical auxiliary systems. Connections between gen
40、erating stations located on different sites are excluded; d) the electrical system of a factory, industrial plant or other industrial, agricultural, commercial or public premises. The electrical power installation includes, among others, the following equipment: rotating electrical machines; switchg
41、ear; 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 In general, a standard for an ite
42、m of equipment takes precedence over this standard. This European Standard does not apply to the design and erection of earthing systems of any of the following: overhead and underground lines between separate installations; electric railways; mining equipment and installations; fluorescent lamp ins
43、tallations; installations on ships and off-shore installations; electrostatic equipment (e.g. electrostatic precipitators, spray-painting units); test sites; medical equipment, e.g. medical X-ray equipment. This European Standard does not apply to the requirements for carrying out live working on el
44、ectrical installations. BS EN 50522:2010Copyright European Committee for Electrotechnical Standardization Provided by IHS under license with CENELECNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 7 EN 50522:2010 2 Normative references The following referenced docu
45、ments are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529) E
46、N 60909, Short-circuit currents in three-phase a.c. systems (IEC 60909) HD 60364-1, Low-voltage electrical installations Part 1: Fundamental principles, assessment of general characteristics, definitions (IEC 60364-1, modified) HD 60364-4-41, Low-voltage electrical installations Part 4-41: Protectio
47、n for safety Protection against electric shock (IEC 60364-4-41, modified) IEC 60050(151):2001, International Electrotechnical Vocabulary (IEV) Part 151: Electrical and magnetic devices IEC 60050(195):1998, International Electrotechnical Vocabulary (IEV) Part 195: Earthing and protection against elec
48、tric shock IEC 60050(601):1985, International Electrotechnical Vocabulary (IEV) Part 601: Generation, transmission and distribution of electricity General IEC 60050(602):1983, International Electrotechnical Vocabulary (IEV) Part 602: Generation, transmission and distribution of electricity Generation IEC 60050(604):1987, International Electrotechnical Vocabulary (IEV) Part 604: Generation, transmission and distribution of electricity Operation IEC 60050(605):1983, International Electrotechnical Vocabulary (IEV) Part 605: Generatio
