1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationAssessment of workers exposureto electric and magnetic fields ofindustrial induction heatingequipmentBS EN 50519:2010National forewordThis British Standard is the UK implementati
2、on of EN 50519:2010.The UK participation in its preparation was entrusted to Technical CommitteeGEL/106, Human exposure to low frequency and high frequency electromagnetic radiation.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does
3、 not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 62929 7ICS 13.280; 25.180.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the autho
4、rity of the StandardsPolicy and Strategy Committee on 30 April 2010.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 50519:2010EUROPEAN STANDARD EN 50519 NORME EUROPENNE EUROPISCHE NORM March 2010 CENELEC European Committee for Electrotechnical Standardization Comi
5、t Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50519:2010 E ICS 13.280; 25
6、.180.10 English version Assessment of workers exposure to electric and magnetic fields of industrial induction heating equipment Evaluation de lexposition des travailleurs aux champs lectriques et magntiques produits par les quipements industriels de chauffage par induction Beurteilung der Expositio
7、n von Arbeitnehmern gegenber elektrischen und magnetischen Feldern von industriellen induktiven Elektrowrmeanlagen This European Standard was approved by CENELEC on 2010-02-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi
8、s European Standard the status of a national standard without any alteration. Up-to-date 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 version
9、s (English, French, German). A version in any other language made by translation under the 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 Au
10、stria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, 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
11、 Kingdom. BS EN 50519:2010EN 50519:2010 - 2 - Foreword This European Standard was prepared by WG 9 WP 1 “Induction Heaters” of the Technical Committee CENELEC TC 106X, Electromagnetic fields in the human environment. The text of the draft was submitted to the formal vote in February 2009. On the bas
12、is of the established voting results, CLC/TC 106X decided to prepare an amendment for inclusion in the standard to make it fully protective for doing workers exposure assessments in all eventualities. The text of the draft amendment (FprAA) was submitted to the Unique Acceptance Procedure and the co
13、mbined text was approved by CENELEC as EN 50519 on 2010-02-01. 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 responsible for identifying any or all such patent rights. The following dates were f
14、ixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2011-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-02-01 This European Standard has been prep
15、ared under Mandate M/351 given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directive 2004/40/EC. _ BS EN 50519:2010- 3 - EN 50519:2010 Contents 1 Scope . 4 2 Normative references . 4 3 Terms and definitions 5 4 General conside
16、rations . 7 5 Classification of induction heating equipment . 8 6 Assessment procedure 8 7 Measurement 9 7.1 Preparation of the measuring action 9 7.2 Initial field topology scan 10 7.3 Final measurement .10 8 Documentation .11 Annex A (informative) Particular induction heating applications and wors
17、t case operating conditions13 Annex B (informative) Examples of magnetic field-measurements .14 B.1 Example for the assessment of the magnetic-field of a horizontal source .14 B.2 Example for a documentation of the measurement results 16 Bibliography 17 Figures Figure 1 - Principle layout of an indu
18、ction heating installation .7 Figure B.1 - Example of system of co-ordinates x, y, h in a layout drawing of an induction heating equipment for the assessment of the magnetic-field of a horizontal source 14 Figure B.2 - Example for the documentation of the measurement results 16 Tables Table A.1 - Li
19、st of particular induction heating applications (as listed in Clause 1) indicating specific features with the view to particular characteristics to be considered for the measuring procedure. 13 Table B.1 - Example of a working table to introduce the co-ordinates of the measuring points relating to e
20、xample Figure B.1 15 Table B.2 - Example of a form for the report of the measuring procedure 15 BS EN 50519:2010EN 50519:2010 - 4 - 1 Scope This European Standard specifies procedures for assessment of electric, magnetic and electromagnetic fields produced by industrial and professional induction he
21、ating equipment. NOTE This European Standard does not apply to household appliances. Typical induction heating applications are for example: - melting; - zone-melting; - heating before hot forming; - heating by tunnel-inductor; - hardening / coaxial transformer handheld devices; - tube welding; - tu
22、be annealing; - hardening; - soldering; - hard-soldering /brazing; - bonding; - annealing; - metal-strip and wire heating; - tempering; - sintering; - shrinking. This product standard covers the frequency range up to 30 MHz taking into account the specific characteristics of industrial and professio
23、nal induction heating equipment and its usage. This European Standard may also be used for assessment regarding the requirements of Directive 2004/40/EC 1 on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (electromagnetic fields
24、), provided that no other relevant field sources are present in close proximity. If other field sources are present, additional assessment according to EN 50499:2008 is necessary. This European Standard does not cover protective measures for people with active implants. 2 Normative references The fo
25、llowing referenced documents 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 50413:2008, Basic standard on measurement and calcul
26、ation procedures for human exposure to electric, magnetic and electromagnetic fields (0 Hz 300 GHz) EN 50499:2008, Procedure for the assessment of the exposure of workers to electromagnetic fields EN 12198-1, Safety of machinery - Assessment and reduction of risks arising from radiation emitted by m
27、achinery - Part 1: General principles IEC 60050-841:2004, International Electrotechnical Vocabulary - Part 841: Industrial electroheat BS EN 50519:2010- 5 - EN 50519:2010 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. SI-units are used throughou
28、t the standard. 3.1 action values the magnitude of directly measurable parameters, provided in terms of electric field strength (E), magnetic field strength (H), magnetic flux density (B) and power density (S), at which one or more of the specified measures in Directive 2004/40/EC must be undertaken
29、. Compliance with these values will ensure compliance with the relevant exposure limit values (from 2004/40/EC) EN 50413:2008, 3.1 3.2 contact current (IC) current flowing into the body resulting from contact with a conductive object in an electromagnetic field. This is the localised current flow in
30、to the body (usually the hand, for a light brushing contact), expressed in Ampere (A) EN 50413:2008, 3.4 3.3 electric field strength (E) vector quantity obtained at a given point that represents the force (F) on an infinitely small charge (q) divided by the charge: FEq= electric field strength is ex
31、pressed in volt per metre (V/m) EN 50413:2008, 3.7 3.4 employer any natural or legal person who has an employment relationship with the worker and has responsibility for the undertaking and/or establishment (from 89/391/EEC) EN 50499:2008, 3.2 3.5 exposure for the purpose of this standard exposure o
32、ccurs whenever and wherever a worker is subjected to magnetic fields from industrial induction heating equipment 3.6 exposure limit values limits of exposure to electromagnetic fields, which are based directly on established health effects and biological considerations. Compliance with these limits
33、will ensure that workers exposed to electromagnetic fields are protected against all known adverse health effects (from 2004/40/EC) EN 50413:2008, 3.9 3.7 induced current (I) current induced inside the body as a result of direct exposure to electromagnetic fields, expressed in Ampere (A) EN 50413:20
34、08, 3.13 BS EN 50519:2010EN 50519:2010 - 6 - 3.8 inductor a heating inductor for creating the magnetic field, which induces currents in a metal charge or in a crucible of conductive materials IEV 841-27-48:2004, mod. 3.9 iso-field-line line with constant values of a recorded field (e.g. magnetic fie
35、ld strength H or magnetic flux density B) 3.10 magnetic field strength (H) vector quantity obtained at a given point by subtracting the magnetization M from the magnetic flux density B divided by the permeability of free space 0: BH M=0Magnetic field strength is expressed in Ampere per meter (A/m) N
36、OTE In vacuum, the magnetic field strength is at all points equal to the magnetic flux density divided by the permeability of free space: BH =0. EN 50413:2008, 3.16 3.11 magnetic flux density (B) the field vector in a point that results in a force (F) on a charge (q) moving with the velocity (v): F
37、= q (v B) The magnitude of the magnetic flux density is expressed in Tesla (T) EN 50413:2008, 3.15 3.12 measuring distance distance between a reference surface of the appliance and the geometrical centre of the field probe 3.13 modulation process of modifying the amplitude, phase and/or frequency of
38、 a periodic waveform in order to convey information EN 50413:2008, 3.17 3.14 peak value the peak value of the electric or magnetic field strength or magnetic flux density represents the maximum magnitude of the field vector. It is composed of three individual components of the electric or magnetic f
39、ield strength or magnetic flux density, which are instantaneous values in three mutually orthogonal directions xyzV VtVtVt =+ 222Pmax ()()() EN 50413:2008, 3.19 BS EN 50519:2010- 7 - EN 50519:2010 3.15 probe input device of a measuring instrument, generally made as a separate unit, which transforms
40、the measured input value to a suitable output value EN 50413:2008, 3.24 3.16 worker any person employed by an employer, including trainees and apprentices but excluding domestic servants (from 89/391/EEC) NOTE This definition may be subject to national adaptation which then takes precedence. EN 5049
41、9:2008, 3.9 3.17 work place location where workers have access as part of their duties EN 50499:2008, 3.8 3.18 worst case operating conditions operating conditions of the equipment, where the maximum exposure occurs (See also Annex A, list of relevant items for particular equipment with reference to
42、 the list of typical application in Clause 1). 4 General considerations The principle layout of an induction heating installation consisting of power source and load is shown in Figure 1 as a parallel compensated circuit. Serial compensated circuits are used as well. The load is a resonance circuit
43、comprising a compensating capacitor bank, high current conductors and an inductor or an inductor coil including matching transformer, if applicable. Figure 1 Principle layout of an induction heating installation Inductor and high current carrying conductors are the main sources of magnetic fields. C
44、ontact currents generated by electromagnetic fields and electric fields from induction heating installations with frequencies below 1 MHz are usually below the action values. Therefore they are not taken into account in the context of this standard. High CurrentConductorsCompensation InductorConduct
45、orsPower Source LoadBS EN 50519:2010EN 50519:2010 - 8 - Contact currents from shielded, and some unshielded, induction heating installations at frequencies of 1 MHz or above can approach the action values and they may need to be measured. If so, this should be done in accordance with EN 50413. Elect
46、ric fields from some unshielded induction heating installations at frequencies of 1 MHz or above can approach the action values and they may need to be measured. If so, this should be done in accordance with EN 50413. 5 Classification of induction heating equipment Induction heating equipment can be
47、 divided in three groups: (1) equipment using inductors with cylindrical coil/s operating in horizontal position; (2) equipment using inductors with cylindrical coil/s operating in vertical position; (3) equipment not belonging to groups (1) and (2). In general groups (1) and (2) contain high power
48、equipment, e.g. for melting, sintering, heating of billets before hot forming. Their field distribution is approximately rotationally symmetrical. However, the field distribution may be influenced by metallic construction elements (e.g. yokes, frames and cages). Group (3) contains equipment with non
49、-cylindrical inductors, which may have complex geometries and are used e.g. for hardening, annealing, soldering etc. Their field distribution could be very complicated. 6 Assessment procedure The assessment of the equipment can be based on measurements, calculation / simulations or on their combination. Assessment results previously obtained for an equipment may be used for the exposure assessment of an equipment with similar design and working conditions. In cases where calculation or simulation
