1、DRAFT FOR DEVELOPMENTDD IEC/TS 60519-5:2008Safety in electroheat installations Part 5: Specifications for safety in plasma installationsICS 25.180.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g3
2、9g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58DD IEC/TS 60519-5:2008This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 53921 3National forewordThis Draft for Development is the UK implementation of IE
3、C/TS 60519-5:2008.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and experience of its practical application can be
4、 obtained.Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible for its conversion to an international standard. A review of this publication will be initiated not later than three years after its
5、 publication by the international organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards.According to the replies received by the end of the review period, the responsible
6、 BSI Committee will decide whether to support the conversion into an international Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, Lo
7、ndon W4 4AL.The UK participation in its preparation was entrusted to Technical Committee PEL/27, Electroheating.A list of organizations 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. U
8、sers are responsible for its correct application.Amendments/corrigenda issued since publicationDate CommentsIEC/TS 60519-5Edition 1.0 2008-03TECHNICAL SPECIFICATIONSafety in electroheat installations Part 5: Specifications for safety in plasma installations DD IEC/TS 60519-5:2008CONTENTS 1 Scope and
9、 object4 2 Normative references .4 3 Terms and definitions .4 4 Safety requirements in thermal plasma systems design and installation features .5 4.1 Arc plasma torch systems5 4.1.1 General requirements 5 4.1.2 Electric circuit5 4.1.3 Direct current arc power supply .5 4.1.4 Torch sockets, plugs and
10、 connection cables 5 4.1.5 Torch.5 4.1.6 Cooling circuit .6 4.1.7 Gas circuit .6 4.1.8 Ignition device .7 4.1.9 Arc plasma system control.7 4.2 Inductive plasma systems7 4.2.1 General requirements 7 4.2.2 Electric circuit7 4.2.3 Power supply.7 4.2.4 Torch sockets, plugs and connection cables 8 4.2.5
11、 Torch.8 4.2.6 Cooling circuit .8 4.2.7 Gas circuit .9 4.2.8 Ignition device .9 4.2.9 Inductive plasma system control 10 5 Safety requirements in installations using plasma torches - design and installation features10 5.1 General .10 5.2 Spraying equipment.10 5.3 Heating and thermochemical treating
12、equipment .10 6 Operation of plasma systems and equipment11 6.1 General requirements11 6.2 Protective means of the operator.11 6.3 Starting and stopping 11 6.4 Protection against toxic substances liable to be produced during operation of the torch11 6.5 Protection against overheating 11 6.6 Protecti
13、on against acoustic noise 12 6.7 Protection against electromagnetic emissions .12 6.8 Protection against particles .12 6.9 Protection against UV radiation .12 6.10 Fire protection.12 6.11 Protection against damage to electric cables, liquid cooling and hydraulic circuit 12 7 Maintenance of plasma sy
14、stems and installations.12 7.1 General requirements12 2 DD IEC/TS 60519-5:20087.2 Specific requirements12 8 Marking, labelling and technical documentation12 Annex A (informative) Electromagnetic emission threshold values around the torch system in operation.13 Bibliography14 3 DD IEC/TS 60519-5:2008
15、SAFETY IN ELECTROHEAT INSTALLATIONS Part 5: Specifications for safety in plasma installations 1 Scope and object This Technical Specification specifies safety requirements applicable to a) thermal plasma torch systems: arc plasma systems, inductive plasma systems; b) installations using plasma torch
16、 systems: spraying equipment, solid, liquid and gaseous charge heating and thermochemical treatment equipment. For both plasma torch systems and installations using plasma torch systems, this specification determines safety requirements for all components, including the electrical equipment, the coo
17、ling circuits, the gas supply circuits, the furnace or reactor and more generally, all other equipment associated with the use of the furnace or reactor. Safety and construction requirements for plasma torches for welding, cutting and allied processes are specified in IEC 60974-7. 2 Normative refere
18、nces The following 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 60050-841:2004, International Electrotec
19、hnical Vocabulary Part 841: Industrial electroheat IEC 60519-1:2003, Safety in electroheat installations Part 1: General requirements IEC/TS 60680, Test methods of plasma equipment for electroheat and electrochemical applications CISPR 11, Industrial, scientific and medical (ISM) radio-frequency equ
20、ipment Electromagnetic disturbance characteristics Limits and methods of measurement 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-841, IEC 60519-1 and IEC/TS 60680 apply. 4 DD IEC/TS 60519-5:20084 Safety requirements in thermal plasma system
21、s design and installation features 4.1 Arc plasma torch systems 4.1.1 General requirements See IEC 60519-1. 4.1.2 Electric circuit See IEC 60519-1, Clause 6. In addition, 6.4.1 of IEC 60519-1 applies to the complete installation. 4.1.3 Direct current arc power supply The following specific requireme
22、nts apply to systems with d.c. arc power supply. 4.1.3.1 Power supply grounding One pole (positive or negative, depending on the torch polarity), on the d.c. side of the arc power supply, shall be grounded using a separated earth from the main one of the system, so as to avoid possible leakage curre
23、nts towards electrical circuits such as those used for the torch control. 4.1.3.2 Connection of the power supply to the torch When the torch is off, the cables on the d.c. side shall be grounded through an earth grounding switch, so as to safely handle the torch. A specific procedure shall be perfor
24、med before the arc ignition, through a manual locking/unlocking device (generally operated with safety keys), authorizing in particular the main breaker to be online and the earth grounding switch to be in the off position. Moreover, a final clearance key may be used by the operator to start the ign
25、ition sequence. This procedure shall meet the regulations in force in the country where the equipment is to be installed. 4.1.4 Torch sockets, plugs and connection cables See IEC 60519-1, Clause 8. 4.1.5 Torch An arc plasma torch of any design has the following characteristic features: a high temper
26、ature gas, high voltage (in general) and liquid cooling (generally water). Consequently, the design and construction shall satisfy the following criteria for safe operation: a) electrical features: permanent electrical contact, during operation, between parts designed to be at the same voltage, incl
27、uding the clamping of electrodes and pieces to be earth grounded, to avoid overheating; for a high voltage torch, automatic shut down of the torch in case the leakage current through the torch body excesses 10 mA; permanent electrical insulation between pieces to be brought to different voltages (an
28、d specifically between the electrodes), so that no unintended breakdown can occur under normal operating conditions; b) cooling liquid features: 5 DD IEC/TS 60519-5:2008 cooling liquid resistivity and torch circuit designed to maintain, during operation, the required insulation between pieces to be
29、brought to different voltages, and specifically the electrodes; in case of electrode break through (accidental or normal wear), the phenomenon shall remain under control firstly through the electrode material and/or design, secondly by its detection to shut down the torch. 4.1.6 Cooling circuit The
30、following specific requirements apply to the cooling utilities: a) mechanical features: the cooling liquid hoses of the torch, fixed or hand operated, shall have a sufficient length, flexibility and appropriate radius of curvature (if any), so as to be facing the stresses generated by the cooling li
31、quid high pressure and to allow handling of the particular hand operated torch; taking into account the high pressure necessary to obtain the specified mass flow rate in the hoses, their mechanical strength shall not be appreciably affected by accidental or steady state exposure to hot particles (ho
32、t material from a furnace) or thermal heating from the torch itself or from hot material coming out from the process; if the direction of the cooling liquid flow is important, it shall be indicated by arrows and/or colour codes on the connecting fittings of the torch and hoses. Non-interchangeable c
33、ouplers shall be used; the torch cooling liquid hoses, pipes and fittings shall remain liquid tight in the event of liquid hammer or blocking during operation at the specified mass flow rate, taking into account also the effects of heat on the hoses, also possibly due to radiation and ultra violet r
34、adiation; flexing at the coupling of the cooling liquid inlets and outlets to the torch shall be minimized as far as possible at the torch body and the couplings be provided at least with a basic insulation to reduce the possibility of electrical breakdown within the torch body; b) electrical featur
35、es: for the high-voltage torch, the hoses shall be made of insulated material, with length defined to limit the leakage current to a value below 10 mA; the torch shall be electrically shut down when the cooling circuit is disconnected or when the flow rate is below that specified; the operator shall
36、 have access to the cooling circuit control and monitoring devices, to be able to read their indications and take necessary steps when required. 4.1.7 Gas circuit The following specific requirements apply to the gas utilities: a) general features: safety rules for the use of industrial gas in high p
37、ressure tanks, taking account of the work regulations in force in the country where the equipment is to be installed; b) mechanical features: the gas hoses of installations, fixed or hand operated, shall have a sufficient length, flexibility and appropriate radius of curvature (if any), so as to sus
38、tain the constraints generated by the gas high pressure and to allow handling in the case of hand-operated torch; the gas admission hose(s) shall be so designed as to withstand the pressure required to obtain the specified mass flow rate, which shall not be appreciably diminished by accidental or st
39、eady-state exposure to hot particles or hot material. Their resistance to heat and ultra violet radiation under normal operating conditions shall meet the requirements; 6 DD IEC/TS 60519-5:2008 the fastening of gas hose(s) and pipes to the connecting fittings shall withstand the gas pressure occurri
40、ng in the event of circuit blockage; c) electrical features: for the high-voltage torch, the hose(s) shall be made of insulated material, with length defined to limit the leakage current to a value below 10 mA; a safety device shall prevent the ignition of the torch when the gas circuit is shut off
41、or when the minimum mass flow rate specified by the torch manufacturer is not reached; the operator shall have access to the gas circuit control and monitoring devices, to read their indications when desired; d) other features: the compressed gas containers installed close to the place of use of the
42、 plasma torch shall be protected against possible overheating, electric discharges and ejections of incandescent material. Similar precautions shall be taken for portable compressed gas containers. 4.1.8 Ignition device The following specific requirements apply to ignition devices: a) high-frequency
43、 ignition device: protection against high voltage, in agreement with the regulations in force in the country where the equipment is to be installed; b) short-circuit ignition device: in general, a high-pressure hydraulic cylinder is used to move the device. The requirements, as defined for the cooli
44、ng liquid circuit, apply to this device; non-flammable and biodegradable hydraulic liquid shall be used. NOTE The ignition device can be the main source of electromagnetic emissions. 4.1.9 Arc plasma system control For safety purpose, several emergency push buttons shall be available to shut off the
45、 plasma system, through a wired circuit. 4.2 Inductive plasma systems 4.2.1 General requirements See IEC 60519-1. 4.2.2 Electric circuit See IEC 60519-1, Clause 6. In addition, 6.4.1 of IEC 60519-1 applies to the complete installation. 4.2.3 Power supply 4.2.3.1 Power supply grounding The power supp
46、ly shall be grounded using a separate earth from the main one of the system, so as to avoid possible paths for leakage currents such as those created by the torch control circuits. 4.2.3.2 Connection of the power supply to the torch The following shall be taken into account: 7 DD IEC/TS 60519-5:2008
47、a) the torch shall be enclosed inside a Faraday cage to reduce electromagnetic emission and to prevent the operator to get into contact with the high voltage terminals. An interlock signal shall turn off the high voltage if the torch enclosure is opened; b) the high voltage terminals shall be connec
48、ted to earth to relieve the residual charge potentially stored in the capacitors when the torch enclosure or Faraday cage is opened or if the RF generator is shut down (see 6.2.4 of IEC 60519-1). 4.2.4 Torch sockets, plugs and connection cables The following shall be taken in to account: the electri
49、cal terminal leads shall be positioned at a sufficient distance from each other and earth to avoid arcing; 6.6 of IEC 60519-1 applies if usage of a water cooled electrical conductor is required; the tensile stresses and tight bending radius of the conductors shall be avoided. 4.2.5 Torch An induction plasma torch, of any design has the following characteristic features: a high temperature gas, high voltage (in general) and liquid cooling (generally water). Consequently, the design and constructio
