1、BRITISH STANDARDBS EN 60519-8:2005Safety in electroheat installations Part 8: Particular requirements for electroslag remelting furnacesThe European Standard EN 60519-8:2005 has the status of a British StandardICS 25.180.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48
2、g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60519-8:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 23 February 2006 BSI 23 February 2006ISBN 0 580 47781
3、 9National forewordThis British Standard is the official English language version of EN 60519-8:2005. It is identical with IEC 60519-8:2005. It supersedes BS 7699-8:1994 which will be withdrawn on 1 September 2008.The UK participation in its preparation was entrusted to Technical Committee PEL/27, E
4、lectroheating, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and
5、promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogueunder the section ent
6、itled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance
7、 with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover.The BSI copyright date displayed in this document indicates when th
8、e document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 60519-8NORME EUROPENNE EUROPISCHE NORM October 2005 CENELECEuropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrote
9、chnische Norm ung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60519-8:2005 E ICS 25.180.10 English version Safety in electroheat installations Part 8: Particular
10、requirem ents for electroslag rem elting furnaces (IEC 60519-8:2005)Scurit dans les installations lectrothermiques Partie 8: Exigences particulires pour fours de refusion sous laitier lectroconducteur (CEI 60519-8:2005) Sicherheit in Elektrowrmeanlagen Teil 8: Besondere Anforderungen an Elektroschla
11、cke-Um schm elzfen (IEC 60519-8:2005) This European Standard was approved by CENELEC on 2005-09-01. CENELEC members are bound to com ply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration
12、. 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 versions (English, French, German). A version in any other language made by transla
13、tion under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the sam e status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
14、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. The text of docum ent 27/472/FDIS, future edition 2 of IEC 60519-8, prepared by IEC TC 27, Industrial ele
15、ctroheating equipm ent, was subm itted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60519-8 on 2005-09-01. This part of EN 60519 is to be used in conjunction EN 60519-1:2003. The clauses of this standard supplem ent the corresponding clauses of EN 60519-1. The following dates w
16、ere fixed: latest date by which the EN has to be implem ented at national level by publication of an identical national standard or by endorsem ent (dop) 2006-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-09-01 Annex ZA has been added by CE
17、NELEC. _ Endorsem ent notice The text of the International Standard IEC 60519-8:2005 was approved by CENELEC as a European Standard without any m odification. _ EN 60519-8:2005 2 Foreword 3 EN 60519-8:2005CONTENTS1 Scope and object42 Normative references .43 Terms and definitions .44 Classification
18、of electroheat equipment according to voltage bands .45 Classification of electroheat equipment according to frequency bands .56 General requirements .57 Isolation and switching .68 Connection to the supply network and internal connections .79 Protection against electric shock.710 Protection against
19、 overcurrent 711 Equipotential bonding .712 Control circuits and control functions.713 Protection against thermal influences814 Risk of fire and danger of explosion 815 Marking, labelling and technical documentation.916 Information on inspection and commissioning, and instructions for utilization an
20、d maintenance of electroheat installations10Annex A (normative) Additional requirements for the safety of non-electrical components of furnace installations 11Annex ZA (normative) Normative references to international publications with their corresponding European publications12EN 60519-8:2005 4 SAF
21、ETY IN ELECTROHEAT INSTALLATIONS Part 8: Particular requirements for electroslag remelting furnaces 1 Scope and object This part of IEC 60519 applies to electroheat installations for remelting and, in some cases, for refining processes of metals through direct resistance heating of a conductive slag
22、. The particular requirements for the safety of persons in or around an electroslag remelting furnace are the object of this standard. The general requirements are included in IEC 60519-1. Test methods for electroslag remelting furnaces are specified in IEC 60779. 2 Normative references The followin
23、g 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. IEC 60050-841, International Electrotechnical Vocabulary Part
24、 841: Industrial electroheat IEC 60519-1:2003, Safety in electroheat installations Part 1: General requirementsIEC 60779:2005, Industrial electroheat equipment Test methods for electroslag remelting furnaces 3 Terms and definitions For the purposes of this standard, the terms and definitions given i
25、n IEC 60050-841, IEC 60519-1 and IEC 60779, as well as the following apply. 3.1 multi-station configuration electroslag remelting furnace configuration having more than one melt station 4 Classification of electroheat equipment according to voltage bands Clause 4 of IEC 60519-1 is applicable except
26、as follows. 4.1 Addition:The voltage band is determined by the line-to-line open-circuit rated supply voltage to the electrode(s). 5 EN 60519-8:20055 Classification of electroheat equipment according to frequency bands Clause 5 of IEC 60519-1 is applicable. 6 General requirements The requirements of
27、 Clause 6 of IEC 60519-1 and Annex A of this standard apply, except as follows. 6.1.2 Addition:The slag melting furnace and ingot moulds shall be covered by a collecting system to extract fumes from the working area. 6.2 Addition: 6.2.13 The following requirements shall be met to ensure adequate saf
28、ety in operation. 1) The supply system shall be designed to withstand sudden current fluctuations occurring at the start of the melting process with dry slag. 2) The circuit-breaker shall be designed for frequent operation. 6.2.14 The following requirements apply to the power circuit.1) This circuit
29、 shall include an earthing connection preferably at the base plate, which supports the ingot. If the installation enables several melting stations to be supplied from the same power supply, each station shall be provided with an earth connection. For the particular case of a single-head multi-statio
30、n co-axial electroslag remelting furnace, it is preferable to ground the power circuit at the power supply instead of at the base. In no case shall the operating personnel be exposed to harmful voltages. If the power circuit is multiple-earthed, care shall be taken with the current which flows betwe
31、en the earthing points and through components of the furnace. 2) The circuit of any melting station which is not working shall be isolated from the supply but not from earth. 6.4 Addition:6.4.6 Care shall be taken to ensure that the operating personnel are not exposed to electromagnetic fields in ex
32、cess of national standards. 6.6 Addition:6.6.7 Special precautions shall be taken to ensure continuance of the cooling of the ingot mould and the ingot base in the event of power failure. 6.6.8 The following indications and measurements shall be provided for important cooling circuits, for example,
33、moulds, base plates, electrode clamps: monitoring of the cooling water flow; measurement of the cooling water outlet temperature. EN 60519-8:2005 6 Optimally, measurement of the cooling water inlet temperature shall be applied. The inlet temperature of the cooling water shall not be less than the de
34、w point of the environment temperature to avoid moisture condensation on the surface of water-cooled components. The water flow and temperature rise of each cooling circuit shall be monitored separately. Lack of cooling (in important circuits as stated above) shall switch off the furnace power suppl
35、y.6.6.9 The cooling system shall be designed to meet the following requirements. 1) The supply of cooling water shall be adequate to prevent undue heating of the cooled walls. 2) Cast and/or welded ingot moulds shall be free from porosities, cracks, etc., which could have a detrimental effect on wat
36、ertightness and heat transfer. 3) The use of seals likely to come into contact with molten materials shall be prohibited. 7 Isolation and switching The requirements of Clause 7 of IEC 60519-1 apply, except as follows. Addition: 7.3 High-voltage circuit-breaker closing conditions 1) The isolator shal
37、l be in the closed position. 2) The setting of the secondary voltage shall be checked. 3) Correct furnace operating conditions shall be established. NOTE It is desirable that provision be made for an illuminated or other signal indicating that the start-up conditions are satisfied and that the circu
38、it-breaker can be closed. 7.4 Switching-on in power circuit The following conditions shall be satisfied for the power circuit before switching on. a) The melting station change-over switches shall be in the closed position. The station in operation shall be indicated on the control board. b) The ele
39、ctrode and the ingot mould shall be aligned in the melting position. c) The base plate shall be in the operating position. d) Removable contact-making devices shall be in the closed position; in particular, electrode clamps or contact shoes, either closed or at least with minimum pressure if a hydra
40、ulic or pneumatic system is used, or locked if the system is mechanically operated. The same requirement shall be met by the clamping of the ingot base plate. e) The connections of the cooling circuit, if provided, shall be in working order (flow, pressure and temperature). 7 EN 60519-8:20058 Connec
41、tion to the supply network and internal connections The requirements of Clause 8 of IEC 60519-1 apply. 9 Protection against electric shock The requirements of Clause 9 of IEC 60519-1 apply. 10 Protection against overcurrent The requirements of Clause 10 of IEC 60519-1 apply. 11 Equipotential bonding
42、 The requirements of Clause 11 of IEC 60519-1 apply. 12 Control circuits and control functions The requirements of Clause 12 of IEC 60519-1 apply, except as follows. Addition: 12.3 Control station The following indications and controls shall be grouped in the control room: flow, pressure and tempera
43、ture indications of mould and base-plate cooling circuits; secondary current and voltage measurement; control of movements likely to occur during melting (furnace on-load); setting of desired operating values; alarms associated with the furnace; emergency stop switch. The control station shall be lo
44、cated so that the furnace is in full view, and, as far as possible, a distance between the control station and the furnace compatible with safety shall be provided. 12.4 Emergency stop switch The emergency stop switch shall cause automatic raising of the electrode(s) by a distance sufficient to clea
45、r the slag; disconnection of the furnace power supply. It shall not cause stopping of cooling water pumps or closure of cooling circuits. EN 60519-8:2005 8 13 Protection against thermal influences The requirements of Clause 13 of IEC 60519-1 apply, except as follows. Addition: 13.6 The control stati
46、on and the melting power supply shall be completely protected against the liquid metal and slag ejected from the melting area. 13.7 The electrical, mechanical and hydraulic equipment as well as the flexible connections of cooling circuits shall be protected against heat radiated direct from the slag
47、 and electrodes and convected hot gases. They shall also be protected against heating in excess of admissible limits due to electric and electromagnetic phenomena (resistive or inductive). So as not to impair safety, all metal parts which are subjected to high-intensity magnetic fields and are in co
48、ntact with oil, shall be made of non-magnetic material and installed in such a way as to avoid formation of closed loops. 13.8 Access to the supporting structure above and under the melting area shall be forbidden whenever the furnace is energized. Operators who have to service the working furnace (
49、for example, temperature measurement, changing electrodes) and be near live or hot parts shall wear protective clothing: gloves, footwear, visors (goggles), non-metallic safety helmets, etc. 14 Risk of fire and danger of explosion The requirements of Clause 14 of IEC 60519-1 apply, except as follows. Addition: 14.1 Prevention of the crucible and base plate from perforation Perforation of the crucible and base plate may cause a fire or an explosion due to the cooling-water flow into liquid met
