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1、BRITISH STANDARD BS 7690:1993 IEC 396:1991 Test methods for induction channel furnaces (Implementation of CENELEC HD 610 S1) UDC 621.783.2-83:620.1 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7690:1993 T
2、his British Standard, having been prepared under the direction of the Power Electrical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1993 BSI 10-1999 The following BSI references relate to the work on this standar
3、d: Committee reference PEL/87 Draft for comment 91/34929 DC ISBN 0 580 22266 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Standards Policy Committee (PEL/-) to Technical Committee PEL/87, upon which the following bo
4、dies were represented: Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) British Glass Manufacturers Confederation British Industrial Furnace Constructors Association British National Committee for Electroheat British Steel plc Electric Trace Heating Industry
5、 Council (ETHIC) Electricity Association Energy Industries Council Engineering Equipment and Materials Users Association Engineering Industries Association Health and Safety Executive Induction and Dielectric Heating Manufacturers Assn. Institution of Electrical Engineers Lighting Industry Federatio
6、n Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7690:1993 BSI 10-1999i Contents Page Committees responsibleInside front cover National foreword
7、ii Foreword2 Section 1. General 1.1Scope and object3 1.2Normative references3 1.3Definitions3 Section 2. Tests 2.1Type of tests and general conditions of tests5 Section 3. Description of tests 3.1Methods for tests and measurements6 Annex A (normative) Explanatory diagrams for symbols and definitions
8、 relating to the furnace power circuit8 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications9 National annex NA (informative) Cross-referencesInside back cover Licensed Copy: London South Bank University, London South
9、 Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7690:1993 ii BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Power Electrical Engineering Standards Policy Committee and is the English language implementation of HD 6
10、10 S1:1992 Test methods for induction channel furnaces, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 396:1991, published by the International Electrotechnical Commission (IEC). The graphics signs, symbols and letters used can be found i
11、n the following British Standards. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. BS 393
12、9Graphic symbols for electrical power, telecommunications and electronics diagrams Part 1:1986 General information, general index Part 2:1985 Symbol elements, qualifying symbols and other symbols having general applications Part 3:1985 Conductors and connecting devices Summary of pages This document
13、 comprises a front cover, an inside front cover, pages i and ii, the HD title page, pages 2 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front co
14、ver. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 610 S1 November 1992 UDC 621.783.2-83:620.1 Descriptors: Induction furnace, channel
15、 furnace, test method, industrial heating, electroheating English version Test methods for induction channel furnaces (IEC 396:1991) Mthodes dessai des fours induction canal (CEI 396:1991) Prfverfahren fr Induktions-Rinnenfen (IEC 396:1991) This Harmonization Document was approved by CENELEC on 1992
16、-09-15. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning national implementation may be obtained on applicatio
17、n to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemb
18、ourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussel
19、s 1992 Copyright reserved to CENELEC members Ref. No. HD 610 S1:1992 E Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7690:1993 BSI 10-1999 2 Foreword The CENELEC questionnaire procedure, performed for find
20、ing out whether or not the International Standard IEC 396:1991 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as Harmonization Document. The reference document was submitted to the CENELEC members for formal vote and was approved b
21、y CENELEC as HD 610 S1 on 15 September 1992. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A and Annex ZA are normative. latest date of announcement of the HD at national level(doa) 1992-12-01 latest date of publication o
22、f a harmonized national standard(dop) 1993-06-01 latest date of withdrawal of conflicting national standards(dow) 1993-06-01 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7690:1993 BSI 10-19993 Section 1.
23、General 1.1 Scope and object This International Standard applies to electroheat installations comprising industrial induction channel furnaces for melting, holding and superheating. Its object is the standardization of test methods to determine the essential parameters and technical characteristics
24、of electroheat installations comprising the type of furnaces indicated above. With the exception of the safety test of items a), b), and c) of 2.1.2 the list of tests given in this standard is not mandatory and is not restrictive. Tests may be selected from this list as required for the characteriza
25、tion and evaluation of a furnace. Additional tests may be carried out, preferably in agreement between manufacturers and users of the furnaces concerned. 1.2 Normative references The following International Standards contain provisions which, through reference in this text, constitute provisions of
26、this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indica
27、ted below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 398:1972, General test conditions for industrial electro-heating equipment. IEC 50(841):1983, International Electrotechnical Vocabulary (IEV), Chapter 841: Industrial electroheating. 1.3 Definitions
28、For definitions of fundamental and general terms in the electroheat field, the reader should refer to IEC 50(841). The following definitions apply for the purpose of this standard. For explanatory diagrams, see Annex A. 1.3.1 electroheat installation with induction channel furnace installation compr
29、ising the induction channel furnace and the electrical and mechanical equipment necessary for the operation and utilization of the furnace the electrical equipment comprises all electrical components including conductors and switchgear in the furnace power circuits situated after the supply disconne
30、cting switch and the auxiliary circuits 1.3.2 induction channel furnace an induction melting or holding furnace forming a transformer whose secondary circuit comprises the molten metal contained in a channel made of refractory material and which is connected to a refractory lined chamber also contai
31、ning molten metal, into which charge pieces to be heated are placed (IEV 841-05-19) NOTEAn induction channel furnace may comprise one or more inductor assemblies which may be replaceable. 1.3.3 inductor assembly an assembly of inductor coils, magnetic cores, shields, casing and refractory lining (IE
32、V 841-05-23) 1.3.4 inductor coil electrical winding on a magnetic core connected to an a.c. supply and for generating an alternating magnetic flux in the core 1.3.5 magnetic core closed laminated iron core, creating a low reluctance path for the magnetic flux 1.3.6 cooling and protection shield for
33、a coil an air or water-cooled shield arranged around the inductor coil to protect it IEV 841-05-24 (modified) 1.3.7 compensated circuit of the furnace the electric circuit comprising the inductor coil and its appropriately dimensioned compensating capacitor bank 1.3.8 input power of the furnace powe
34、r circuit apparent power Sl (kVA) or active power Pl(kW) the electric power at the supply line to the furnace power circuit with rated values of voltage Uln and frequency fln 1.3.9 power-factor of the furnace power circuit cos :1 the ratio of the active power Pl to the apparent power Sl Licensed Cop
35、y: London South Bank University, London South Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7690:1993 4 BSI 10-1999 1.3.10 rated electrical values rated electrical values of the installation or a part of it are those for which it is designed and marked; the marki
36、ng comprises at least: frequency fn (Hz) or frequency band fn1 fn2 (Hz) voltage Un(V) active power Pn(kW). 1.3.11 1.3.11.1 input voltage of the compensated circuit Uc (V) voltage across the input terminals of the compensated circuit 1.3.11.2 furnace voltage UF (V) voltage across the terminals of the
37、 inductor coil or system of inductor coils 1.3.12 furnace current lF (A) current absorbed by the inductor coil or the system of inductor coils 1.3.13 furnace frequency fF (Hz) frequency of the furnace current lF 1.3.14 1.3.14.1 power of the compensated circuit Sc, Pc electric power apparent power Sc
38、(kVA) or active power Pc(kW) at the input of the compensated circuit 1.3.14.2 furnace power SF, PF electric power apparent power SF (kVA) or active power PF (kW) at the terminals of the inductor coil or system of inductor coils 1.3.15 1.3.15.1 power-factor of the compensated circuit cos :c ratio of
39、the active power Pc to the apparent power Sc at the input of the compensated circuit 1.3.15.2 power-factor of the furnace inductor cos :F ratio of active power PF to the apparent power SF at the terminals of the inductor coil or system of inductor coils 1.3.16 rated (useful) capacity of an induction
40、 channel furnaceVr(m3) volume of the specified nominal molten charge which can be withdrawn from the furnace without risk of breaking the heating circuit, the furnace being within the normal tilting limits 1.3.17 rated (useful) charge G (kg) weight of the specified nominal molten charge correspondin
41、g to the rated (useful) capacity of the furnace 1.3.18 capacity of minimum charge Vmin (m3) minimum volume of molten metal in the furnace required to ensure continuity of the heating circuit, the furnace being in normal tilting limits and in normal position 1.3.19 minimum charge Gmin (kg) the weight
42、 corresponding to the capacity of minimum charge 1.3.20 total capacity of a furnace Vt (m3) sum of rated (useful) capacity and the capacity of minimum charge 1.3.21 total charge of a furnace Gt(kg) sum of the rated (useful) charge and the minimum charge 1.3.22 test charge weight of the metal to be m
43、elted and/or superheated to establish specific energy consumption and melting and/or superheating rate 1.3.23 charge temperature F (C) temperature of the charge at a given time of the heating cycle 1.3.24 charge starting temperature FchS (C) temperature of the charge at the beginning of the heating
44、cycle 1.3.25 charge final temperature FchF (C) temperature of the charge attained at the end of the heating cycle immediately before tapping Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7690:1993 BSI 10-1
45、9995 1.3.26 inlet temperature of the coolant FFi (C) temperature of the coolant when entering the cooling circuit of the inductor assembly 1.3.27 outlet temperature of the coolant FFo (C) temperature of the coolant when leaving the cooling circuit of the inductor assembly, with the furnace operating
46、 at rated conditions 1.3.28 ambient temperature FA (C) temperature of the air outside the furnace at a point sufficiently remote so that heat radiation or natural convection exerts no influence 1.3.29 furnace duty at rated conditions (rated furnace duty) furnace operation with a new channel of speci
47、fied dimensions, rated charge and rated power without exceeding maximum voltage, current and frequency 1.3.30 thermal steady-state of furnace thermal state in which the whole energy input into the furnace is used for the compensation of thermal losses 1.3.31 hot state of furnace thermal steady-state
48、 of the furnace at charge final temperature 1.3.32 cold state of furnace thermal state in which the temperature of the furnace constructional component parts is equal to the ambient temperature 1.3.33 intermittent (batch) operation of furnace operation in which a new melting cycle is started only af
49、ter the tapping of the preceding charge 1.3.34 continuous operation of furnace operation during which the molten charge is continually withdrawn, and a charge is continually added 1.3.35 holding power Ph (kW) active power Ph (kW) supplied to the furnace power circuit, in order to maintain the total charge at the rated temperature 1.3.36 energy consumption (active energy consumption Eal (kWh) or reactive energy consumption Erl (kvarh) electric energy supplied to the furnace power circuit 1.3.37 specific energy consumption (kWh/kg)