1、BRITISH STANDARDBS EN 60779:2005Industrial electroheat equipment Test methods for electroslag remelting furnacesICS 25.180.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g
2、53g44g42g43g55g3g47g36g58IncorporatingCorrigendum December 2008BS EN 60779:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 22 February 2006 BSI 2009ISBN 978 0 580 65844 0National forewordAmendments/corrigenda issued since publicationThis
3、British Standard is the UK implementation of EN 60779:2005. It is identical with IEC 60779:2005, incorporating corrigendum December 2008. It supersedes BS 7688:1993 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PEL/27, Electroheating.A list of organi
4、zations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligation
5、s. Date Comments Implementation of IEC corrigendum December 2008. Replacement of Figures 1, 2, and 3. Deletion ofsubclause 5.1030 June 2009EUROPEAN STANDARD EN 60779 NORME EUROPENNE EUROPISCHE NORM November 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normali
6、sation Electrotechnique Europisches Komitee fr Elektrotechnische Normung 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 60779:2005 E ICS 25.180.10 Supersedes HD 470
7、S1:1987English version Industrial electroheat equipment Test methods for electroslag remelting furnaces (IEC 60779:2005) Equipements lectrothermiques industriels Mthodes dessai des fours de refusion sous laitier lectroconducteur (CEI 60779:2005) Industrielle Elektrowrmeanlagen - Prfverfahren fr Elek
8、troschlacke-Umschmelzfen (IEC 60779:2005) This European Standard was approved by CENELEC on 2005-11-01. 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 alterat
9、ion. 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 tran
10、slation 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 Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France
11、, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 27/474/FDIS, future edition 2 of IEC 60779, prepared by IEC TC 27, Indust
12、rial electroheating equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60779 on 2005-11-01. This European Standard supersedes HD 470 S1:1987. The significant technical changes with respect to HD 470 S1:1987 are the additional technical tests described in 5.1,
13、 5.2, 5.3, 5.9, 5.10, 5.11, 5.13, 5.14 and 5.15. 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) 2006-08-01 latest date by which the national standards conflicting with the EN
14、 have to be withdrawn (dow) 2008-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60779:2005 was approved by CENELEC as a European Standard without any modification. _ 2 EN 60779:2005BS EN 60779:2005 3 CONTENTS1 Scope and object42 Normative re
15、ferences .43 Terms and definitions .44 Type of tests and general conditions of their performance .74.1 Type of tests .74.2 General conditions of test performance 85 Recommendations for technical tests 85.1 Measurement of the effective stroke of the electrode ram motion 85.2 Measurement of the speed
16、of the electrode motion.85.3 Measurement of the time interval for exchanging electrodes .85.4 Measurement of the open-circuit secondary voltage of the electroheat installation.85.5 Measurement of the electrical parameters of the secondary circuit of the electroheat installation.85.6 Measurement of t
17、he active power, reactive power and power factor of the electroheat installation.135.7 Measurement of the temperature of components which are subjected to strong magnetic field and/or radiated or converted heat145.8 Measurement of the temperature rise of the cooling-water 155.9 Measurement of the co
18、oling-water flow rate and heat losses.155.10 Measurement of the intensity of the magnetic field at or near an electroslag remelting furnace.155.11 Measurement of the melting rate of consumable electrode(s)155.12 Determination of the specific energy consumption 165.13 Measurement of vacuum parameters
19、 for a vacuum electroslag remelting furnace165.14 Measurement of the pressure in the chamber of a pressurized electroslag remelting furnace.175.15 Measurement of the gas composition of an electroslag remelting furnace working under an inert gas atmosphere17Figure 1 Example of a single-phase electros
20、lag remelting furnace circuit 9Figure 2 Example of a three-phase electroslag remelting furnace circuit12Figure 3 Example of a coaxial electroslag remelting furnace circuit .14EN 60779:2005Annex ZA (normative) Normative references to international publications with theircorresponding European publica
21、tions18BS EN 60779:2005 4 INDUSTRIAL ELECTROHEAT EQUIPMENT TEST METHODS FOR ELECTROSLAG REMELTING FURNACES 1 Scope and object This International Standard applies to industrial electroslag remelting furnaces, the rated capacity of which is equal to, or greater than, 50 kg. This standard is applicable
22、 to industrial electroslag remelting furnaces having one or more electrodes and having different melting power supplies, such as alternating current, direct current, or low-frequency current. The object of this standard is the standardization of electroslag remelting furnace test conditions and meth
23、ods to determine the main parameters and technical characteristics. This standard does not cover all possible test methods which may be carried out for the technical and economic assessment of furnaces. 2 Normative references The following referenced documents are indispensable for the application o
24、f this document. For dated references, only the edition applies. For undated references, the latest edition of the referenced documents (including any amendments) applies. IEC 60050-841:2004, International Electrotechnical Vocabulary Part 841: Industrial electroheatIEC 60398:1999, Industrial electro
25、heating installations General test methodsIEC 60676:2002, Industrial electroheating equipment Test methods for direct arc furnaces3 Terms and definitions For the purposes of this document, the following terms and definitions, as well as those given in IEC 60050-841 and IEC 60676, apply. 3.1electrosl
26、ag remelting furnace remelting furnace in which the charge, usually a consumable electrode, is remelted by direct resistance heating of an electrical conductive molten slag NOTE The slag is contained in a mould (crucible). 3.2electroheat installation with an electroslag remelting furnace complete as
27、sembly of electroheat equipment and electrical and mechanical accessories necessary for operation and utilization of an electroslag remelting furnace EN 60779:2005BS EN 60779:2005 5 NOTE The electrical equipment comprises, in particular, the conductors and switchgear in the power, control and regula
28、ting circuits, and the melting power supply(ies), when the device has its own melting power supply(ies). 3.3power of an electroheat installation apparent power S (in kVA) or active power P (in kW) measured at the input of the supply line 3.4power factor of an electroheat installation (cos 3 )ratio o
29、f the active power to the apparent power measured at the input of the supply line 3.5mould (crucible) of an electroslag remelting furnace water-cooled non-consumable container which shapes the ingot to be produced by the electroslag remelting process and which contains the molten slag 3.6secondary e
30、lectrical circuit of an electroslag remelting furnace electrical circuit which is closed by the melting power supply and may include a) output terminals of melting power supply; b) high-current feeder (busbars and/or cables); c) bus switches, if required; d) electrode clamp; e) electrode stub; f) co
31、nsumable electrode or electrodes (depending on the connection system); g) conductive molten slag (not included in the short-circuit test); h) remelted ingot (not included in the case of the furnace with more than two electrodes); i) base plate (depending on the connection system) 3.7consumable elect
32、rode solid part(s) in contact with the molten slag which carries the electrical current necessary for the melting operation and is constituted of the material necessary for the formation of the ingot3.8on-load voltage of an electroslag remelting furnace a) voltage which can be measured between the f
33、ollowing two points (not applicable for a furnace with two electrodes corresponding to single-phase a.c. power supply): the base plate; the electrode clamping device(s) bringing the melting electrical current to the consumable electrode(s) or stub(s) NOTE See UFin Figures 1 and 2. b) for a furnace w
34、ith two electrodes corresponding to single-phase a.c. power supply, voltage measured between the two electrode clamping devices c) in the case of an electroslag remelting furnace of a coaxial design for a single-phase a.c. power supply, the voltage measured between the electrode clamping device and
35、the point of common connection of the multiple return conductors NOTE See UFin Figure 3. EN 60779:2005BS EN 60779:2005 6 3.9rated furnace frequency fn(Hz)value corresponding to the rated furnace current, if the furnace is built for a frequency range 3.10 rated furnace current Inat rated frequency fn
36、maximum current for continuous operation for which the furnace is designed 3.11 rated values of an electroslag remelting furnace rated values, including rated furnace current In, rated furnace power Pn, and rated furnace frequency fn, for which the furnace is designed 3.12 continuous operation of a
37、furnace operation during which the solid ingot is produced and solidified and the consumable electrode is progressively added during the whole process 3.13 steady state of an electroslag remelting furnace state of a furnace in which, in continuous operation, electrical and thermal parameters have re
38、ached relatively constant values 3.14 melting rate of consumable electrode Vm(kg/min)quantity of remelted consumable electrode(s) measured in kilograms within a unit time (min) 3.15 specific energy consumption e (kWh/kg) ratio of the total amount of electric energy (kWh) measured at the input of the
39、 supply line, which is consumed by an electroheat installation for melting the charge in normal operating conditions agreed upon between the manufacturer and the user, to the weight of the ingot produced (kg) 3.16 water-cooled base plate of an electroslag remelting furnace water-cooled plate install
40、ed at the bottom of the mould to contain liquid metal and slag at the beginning of melting in any case, and connected to the cable(s) or busbar(s) to make sure that the current flows through the secondary electrical circuit in the case of furnace operation with one consumable electrode 3.17 furnace
41、high-voltage switch high-voltage switch for switching on and off, under load, the furnace transformer, in accord-ance with operating requirements IEC 60676, 3.8 3.18 electroslag remelting furnace transformer transformer supplying an electroslag remelting furnace EN 60779:2005BS EN 60779:2005 7 3.19
42、electrode clamp metallic, water-cooled equipment for holding an electrode and supplying the current to the electrode IEV 841-26-39, modified 3.20 cooling-water flow rate (m3/h)addition of the following flow rates: a) flow rate of water to cool mould and base plate; b) flow rate of water to cool high
43、-current line; c) flow rate of water to cool the furnace transformer; d) flow rate of water to cool the other elements of the furnace IEC 60676, 3.25, modified 3.21 coaxial arrangement of the electroslag remelting furnace arrangement of more than two return conductors symmetrically positioned around
44、 the crucible for the electroslag remelting furnace 4 Type of tests and general conditions of their performance 4.1 Type of tests The tests shall be carried out under operating conditions including the composition of electroslag agreed upon between the manufacturer and the user. For the assessment o
45、f an electroheat installation containing an electroslag remelting furnace, the following tests are recommended to be performed in the following order: 1) measurement of the effective stroke of the electrode ram motion (see 5.1); 2) measurement of the speed of the electrode motion (see 5.2); 3) measu
46、rement of the time interval for the exchange of two electrodes (see 5.3); 4) measurement of the open-circuit secondary voltage of the electroheat installation (see 5.4);5) measurement of the electrical parameters of the secondary circuit of the electroheat installation (see 5.5); 6) measurement of t
47、he active power, reactive power and power factor of the electroheat installation (see 5.6); 7) measurement of the temperature of components which are subjected to strong magnetic field and/or radiated or converted heat (see 5.7); 8) measurement of the temperature rise of the cooling water (see 5.8);
48、 9) measurement of the cooling-water flow rate and heat losses (see 5.9); 10) measurement of the intensity of the magnetic field at or near an electroslag remelting furnace (see 5.10); 11) measurement of the melting rate of consumable electrode(s) (see 5.11); 12) measurement of the specific energy c
49、onsumption (see 5.12); 13) measurement of the vacuum parameters for a vacuum electroslag remelting furnace (see 5.13); 14) measurement of the pressure in the chamber of a pressurized electroslag remelting furnace (see 5.14); 15) measurement of the gas composition for an electroslag remelting furnace working under inert gas atmosphere (see 5.15). EN 60779:2005BS EN 60779:2005 8 4.2 General conditions of test performance Performance of the tests shall be in accordance with the specification of IEC 60398.
