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1、BRITISH STANDARD BS 7689:1993 IEC 703:1981 Test methods for electroheating installations with electron guns (Implementation of CENELEC HD 440 S1) UDC 621.365.91.001.2.001.4.004.12(083.71) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006, U
2、ncontrolled Copy, (c) BSI BS 7689:1993 This 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 September 1993 BSI 10-1999 The following BSI ref
3、erences relate to the work on this standard: Committee reference PEL/87 Draft for comment 83/20872 DC ISBN 0 580 22250 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Policy Committee (PEL/-) to T
4、echnical Committee PEL/87, upon which the following bodies 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 Electro
5、heat British Steel plc Electric Trace Heating Industry 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 Association Ins
6、titution of Electrical Engineers Lighting Industry Federation Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7689:1993 BSI 10-1999i Contents Pag
7、e Committees responsibleInside front cover National forewordii Text of HD 440 S13 National annex NA (informative) Cross-referenceInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7689:1993 ii
8、 BSI 10-1999 National foreword This British Standard has been prepared under the direction of the Power Electrical Engineering Standards Policy Committee. It is identical with IEC 703:1981 Test methods for electroheating installations with electron guns, published by the International Electrotechnic
9、al Commission (IEC). This standard also implements Harmonization Document HD 440 S1:1983 which was published by the European Committee for Electrotechnical Standardization (CENELEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
10、 are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the HD title page, pages 2 to 6, an inside back cover and a bac
11、k 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 cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled
12、Copy, (c) BSI HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGDOKUMENT HD 440 S1 September 1983 UDC 621.365.91.001.2.001.4.004.12(083.71) Descriptors: Electric heating; furnaces; electron beam English version Test methods for electroheating installations with electron guns Mthodes dessa
13、i des installations lectrothermiques comportant des canons lectrons Prfverfahren fr Elektrowrme-anlagen mit Elektronenkanonen This Harmonization Document was approved by CENELEC on 1983-09-07. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condition
14、s for implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official version
15、s (English, French, German). CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for
16、Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1983 Copyright reserved to CENELEC members Ref. No. HD 440 S1:1983 E Licensed Copy: London South Bank University,
17、 London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7689:1993 BSI 10-1999 2 Contents Page 1Scope3 2Object3 3Definitions3 4General test requirements3 5Test methods4 6Test intervals5 Licensed Copy: London South Bank University, London South Bank University,
18、 Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7689:1993 BSI 10-19993 1 Scope This standard applies to electroheating installations comprising one or more electron guns as heating source. 2 Object The object of this standard is the standardization of test methods to determine the
19、 essential parameters and the technical data and characteristics of electroheating installations comprising one or more electron guns. The standard does not contain a mandatory list of tests and is not restrictive. Tests may be selected from the proposed list. The specification established by agreem
20、ent between the user and the manufacturer of electron beam heating installations can supplement these recommendations but should not be in contradiction with them. 3 Definitions The following definitions apply for the purposes of this standard. For definitions of fundamental and general terms in the
21、 field of electroheating, the reader should refer to Chapter 841 of the International Electrotechnical Vocabulary (I.E.V.). 3.1 cathode an electrode that is the source of the desired electron emission 3.2 anode an electrode connected to the positive terminal of the source and which is usually pierce
22、d to provide a free passage for the electron beam 3.3 emission current the electron current flowing from cathode NOTEThe electron beam current arriving at the workpiece may either be lower than the emission current, or up to several orders of magnitude larger than the emission current if ion bombard
23、ment is also present. 3.4 beam accelerating voltage (high voltage) the potential difference between the cathode and the anode to generate an electric field for acceleration of the electrons 3.5 electron gun chamber the vacuum chamber which contains the electron gun may be separated from the object t
24、o be heated by an aperture, so that between the electron gun (electron beam gun) and the compartment with the workpiece, a relatively high pressure difference can be established 3.6 interlock a device that prevents activation of a piece of equipment when some form of hazard or danger exists 3.7 mech
25、anical interlock interlock achieved by mechanical means 3.8 electrical interlock interlock achieved by electrical circuits 3.9 vacuum chamber the enclosed space of a vacuum plant constructed in such a way that it can withstand a ratified atmosphere inside, and usually containing the workpiece to be
26、treated 3.10 return conductor the electrical interconnection between high-voltage power supply (positive pole) and anodic part of the electron gun as well as between the workpiece to be heated or the chamber surrounding the workpiece. The conductor shall be interconnected to earth or to the earthed
27、conductor of the power supply 4 General test requirements The following tests are to be carried out for the assessment of the electroheating installation with electron guns, except otherwise stated. 4.1 Testing of safety interlocks, mechanical and electrical (see Sub-clause 5.1) 4.2 Testing of retur
28、n conductor and earth and protective connections (see Sub-clause 5.2) 4.2.1 Visual. 4.2.2 With ohmmeter. 4.3 Vacuum test (see Sub-clause 5.3) 4.3.1 With cathode cold. 4.3.2 With cathode hot. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006
29、, Uncontrolled Copy, (c) BSI BS 7689:1993 4 BSI 10-1999 4.4 Testing of cooling water installation (see Sub-clause 5.4) 4.4.1 Leakage test with 1.5 times the nominal pressure. 4.4.2 Testing of the cooling water control devices. 4.4.3 Measurement of final temperature of cooling water at steady state a
30、nd rated power. 4.5 Testing of excess current control device of high-voltage power supply (see Sub-clause 5.5) 4.6 Rated power test according to specifications (see Sub-clause 5.6) 4.6.1 Each electron beam heater. 4.6.2 The complete heating installation. 4.7 Test for X-ray and light emission and rad
31、io interference (see Sub-clause 5.7) In combination with the tests in Sub-clauses 4.6 and 5.6, it is necessary to ensure that regulations and limits of X-ray and light emission in addition to those concerned with radio interference comply with the requirements of the respective country and the inten
32、ded purpose of the heating installations. 4.8 Insulation tests (see Sub-clause 5.8) 4.9 Marking and instructions The indication to be given on the identification plate and operating safety and maintenance instructions are to be checked for completeness. 5 Test methods 5.1 Testing of safety interlock
33、s, mechanical and electrical When testing interlocks, only the control circuits shall be live. These interlocks shall be checked visually by actuating and releasing them several times (at least five times). Should observation leave any doubt as to their functioning correctly, measuring instruments (
34、ohmmeter, voltmeter, buzzer, test lamp) are to be used. NOTESpecial care shall be taken with interlocks for beam acceleration voltage (high voltage) circuits. 5.2 Testing of return conductor and earth and protective connections The return conductor between the high-voltage power supply and the objec
35、t to be heated, which need not be insulated, is of particular importance. 5.2.1 Checking of cable and wire connection points by observation and manual stressing. 5.2.2 Measuring with an ohmmeter, class 2.5 or better. The return conductor connecting cable between the high-voltage generator and the ob
36、ject to be heated may not exceed the resistance derived from the following calculation: where: 5.3 Vacuum test The vacuum pressures specified shall be used except when the design of the systems is such that they cannot be achieved, in which case the manufacturer shall state the limits used for test
37、with an explanatory note in the test report. Measurement shall be carried out using an ionization vacuum gauge when the installation is clean. 5.3.1 1 104 mbar or better shall be attained (when the cathode is cold). 5.3.2 The cathode shall be degassed for 30 min. 5 104 mbar or better shall be attain
38、ed (when the cathode is hot). 5.4 Testing of cooling water installation 5.4.1 All water cooling circuits shall be tested for leakage with a pressure of 1.5 times the nominal pressure applied. Double wall tanks which are not designed for such pressures are excluded. 5.4.2 The cooling water monitoring
39、 devices shall act when the operating pressure or the flow reaches the limit given by the manufacturer. Those tests shall be repeated at least five times. 5.4.3 The test shall be carried out in the hot state and under rated power. The temperature shall be measured by thermometers or equivalent devic
40、es placed at the inlet and outlet of the circuit, readings being taken every 5 min over at least a 30 min period. The difference between the average temperature values read at the inlet and at the outlet will give the temperature rise value. 5.5 Testing of excess current control device of the high-v
41、oltage power supply 5.5.1 The current drawn from the high-voltage power supply shall be increased to a level higher than its rated value, and the excess current control device shall operate at no more than the specified current. The preferred method of performing this test is to apply a short circui
42、t to the output terminals of the high-voltage supply taking suitable precautions to avoid damage to equipment and hazard to personnel. Irat = rated current of the high-voltage generator expressed in amperes Rmax 1.5 Irat - - (ohms)= Licensed Copy: London South Bank University, London South Bank Univ
43、ersity, Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7689:1993 BSI 10-19995 5.5.2 Before rated power tests (Sub-clause 5.6) may be carried out, the normal functioning of the excess current control device is to be first tested by increasing the emission current above its rated va
44、lue, in accordance with the manufacturers specification. 5.6 Rated power test according to the specifications The emission current and high voltage are to be measured with direct current instruments of at least class 1.5 and shall be within specified limits. 5.7 Tests for X-ray and light emission an
45、d radio interference Methods as specified in national standards shall be applied. 5.8 Insulation tests The insulation of the parts under high voltage such as generators, cables, connecting parts, shall be suitable to withstand voltages higher than the maximum operating values. The test value shall b
46、e stated by the manufacturer. 6 Test intervals 6.1 The tests of Sub-clauses 5.1 to 5.7 except those concerning radio interference shall be repeated at least every six months and also after extensive service and extended shutdown. The X-ray emission test shall, in addition, be carried out after any m
47、odification, however minor, to the gun chamber and vacuum tank. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:4
48、3:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7689:1993 BSI 10-1999 National annex NA (informative) Cross-reference Publication referred toCorresponding British Standard BS 4727 Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms IEC 50-841:1983Part 2:
49、Group 10:1985 Industrial electroheating terminology Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:43:02 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7689:1993 IEC 703:1981 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or r