GB 5959.5-1991 Safety of Electric Heating Equipment Part 5 Safety Regulations for Plasma Equipment
Some standard content:
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National Standards of the People's Republic of China
Safety of electroheat installations
Safety regulations for plasma equipment
Part 5
Safety in electroheat installationsPart 5:Specifications for safety inplasma installations
GB5959.591
This standard is equivalent to the international standard IEC519-5 (1980) "Safety of Electric Heating Equipment Part 5 Safety Regulations for Plasma Equipment 1 Subject Content and Scope of Application|| tt||This standard specifies the safety requirements for arc plasma heating equipment and arc plasma furnace equipment other than power supply. This standard applies to manually or mechanically operated spray gun arc plasma heating equipment, such as plasma equipment used for welding, cutting, cladding and spraying. This standard also applies to arc plasma furnace equipment. Note: The spray guns mentioned in this standard all refer to plasma guns. 2 Reference standardsbZxz.net
GB7945 Safety requirements for arc welding equipment welding cable plugs, sockets and couplers GB8118 General technical conditions for arc welding machines
GB5959.1 Safety of electric heating equipment Part 1 General requirements GB5959.2 Electric heating Equipment Safety Part 2 Special Requirements for Electric Arc Furnaces 3 Terminology
The definitions of terms used in this standard are found in the cited standards: GB7945, GB8118, GB5959.1 and GB5959.2. 4 Design and installation Safety requirements
4.1 General requirements 2
See GB5959.1.
Note: If the DC voltage exceeds 80V, the voltage should be clearly marked. 4.2 Refer to GB7945 for sockets, plugs and connecting cables for spray guns.
4.3 Spray gun
The spray gun consists of a water-cooled anode nozzle and a cathode. The spray gun is connected with cooling pipelines, power lines and air supply lines. The gas that generates plasma enters the electrode discharge space through the gas supply pipeline. During the operation of the spray gun, the clamping device of the electrode should be able to ensure reliable electrical contact so that it can be used normally. Instructions:
1) IEC519-5 does not have this "Note" ".
2) Corresponds to Articles 3.1 and 3.2 of IEC519-5. The State Bureau of Technical Supervision approved the implementation on 1992-01-01 on 1991-05-05 of
without generating excess heat under the working conditions. GB5959.5—91
Under normal working conditions, the sealing of the cooling pipeline should be ensured. Electrical insulation shall meet the requirements of Appendix A (Supplement) to protect the operator from any injury during arc ignition and operation of the spray gun. The handle of a hand-operated spray gun is best made of insulating material or covered with an insulating cover. When using a metal body, the metal body should be connected to the earth leakage switch at the power input so that it can be removed in the event of an electrical accident. When the leakage current through the spray gun body exceeds 10mA, the switch cuts off the power supply. The handle of the spray gun should be equipped with a button for the operator to control the power. This button can also be replaced by other devices that can ensure the safety of the equipment.
4.4 Cooling pipeline
4.4.1 The coolant pipe of manually operated spray gun plasma equipment should be of sufficient length and flexibility to avoid affecting the operation of the spray gun. 4.4.2 In order to ensure the pressure required to obtain the specified flow rate in the pipeline, the mechanical strength of the coolant pipe should not be significantly affected by accidental spattering of hot particles due to welding, cutting, spraying or the spray gun itself. It should also be Consider that pipelines are affected by thermal radiation and ultraviolet radiation.
4.4.3 If the direction of coolant flow is important, it should be indicated by an arrow or colored mark on the joint between the spray gun and the cooling pipe. Non-interchangeable joints can also be used.
4.4.4 When used according to the specified flow rate, even if the water outlet pipe is suddenly blocked, the cooling pipe and joints of the spray gun should remain leak-proof. 4.4.5 The operator should have easy access to the control and monitoring of the cooling pipe. devices and, where necessary, their indicated values ??should be visible. 4.4.6 When the cooling pipeline is disconnected or the flow rate is lower than the specified value, the power supply to the spray gun should be automatically cut off. 4.4.7 The bending angle of the water inlet and outlet pipes and the spray gun joint at the gun body should be as small as possible, and necessary insulation measures should be taken for the spray gun joint to reduce the possibility of electrical breakdown in the spray gun body. 4.5 Gas pipeline
4.5.1 Compressed gas containers close to the working area of ??the spray gun should be protected to prevent possible overheating, discharge and the injection of hot objects. Similar protective measures should be taken for mobile compressed gas containers. 4.5.2 The air inlet pipe of manually operated spray gun-type equipment should be of sufficient length and flexibility to avoid affecting the operation of the spray gun. 4.5.3 The design of the air inlet pipe should be able to withstand the pressure required by the specified flow rate. Its strength should not be significantly reduced due to the accidental sputtering of hot particles by the air inlet pipe. Their ability to resist heat and ultraviolet radiation should meet the normal requirements. operating requirements. 4.5.4 The fixation of the gas pipe and joints should be able to withstand the gas pressure generated when the pipeline is blocked. 4.5.5 For safety regulations on the use of high-pressure gas cylinders, please refer to the "Gas Cylinder Safety Supervision Regulations" issued by the State Administration of Labor and Personnel. 4.5.6 When the gas circuit is closed or when the flow rate in the gas circuit is lower than the minimum value specified by the spray gun manufacturer, the safety device should be able to cause the spray gun to automatically extinguish the arc.
4.6 Feeding device and deposited material
4.6.1 Powder feeder (powder feeding device) 2
4.6.1.1 Powder feeder powder hopper (powder storage tank) should be able to It must withstand the pressure required by the gas to transport the powder. When the air flow of the powder outlet is blocked, the powder hopper should not be in danger of bursting.
4.6.1.2 The chamber through which the gas flows in the powder feeder should have reliable sealing measures. When the powder feeder pipeline is blocked, the powder feeding gas should not leak out.
4.6.1.3 The powder feeder should not be affected by accidental sputtering of hot particles generated by operation or the spray gun itself. At the same time, the effects of thermal radiation and ultraviolet radiation on the pipeline should also be considered.
4.6.1.4 The connecting pipeline from the powder outlet of the powder feeder to the spray gun should ensure smooth powder transportation and a certain degree of flexibility so as not to affect the spraying instructions:
1) IEC519-5 There is no such clear statement. 2] Corresponds to IEC519-5 Article 3.7.1 "Distribution device", but the original text is: "Wire or powder distributor shall comply with existing rules and standards for the following aspects: electrical connection; connection to gas pressure pipeline; connection to spray gun Connection. \ Without the following clauses, this standard is divided into 4.6.1 and 4.6.2. Gun operation
GB5959.5-91
4.6.1.5. When in use, even if the powder is clogged, the powder feeding pipe and the connector should be kept leak-proof. 4.6.1.6 When the powder is clogged in the pipeline, a signal and automatic interlock protection should be provided. 4.6.2 Wire feeder (feeding machine). Wire device) 1)
4.6.2.1 When the wire must be in contact with a live object, protective measures should be taken to avoid any harm to the operator. 4.6.2.2 Between the wire outlet of the wire feeder and the entrance of the spray gun. , there should be a hose sheath that ensures smooth conveying of the wire and should not be significantly affected by accidental splashing of hot particles due to operation or by the spray gun itself. 4.6.2.3 When the wire is blocked and stopped. , generally should give a signal and automatically perform interlocking protection. 4.6.3 Material specifications
The deposited material should comply with the relevant requirements of powder particle size or wire diameter size specified by the equipment manufacturer. 4.7 Nameplate and circuit. Piping diagram
4.7.1 The nameplate fixed on each spray gun should have the following logo\manufacturer’s name;
a.
b. Model number of the spray gun;||tt ||Rated power (or rated current);
c.
d. Gas types that can be used
If necessary, the flow rate, pressure and cooling of cooling water can be given. Maximum allowable hardness and minimum resistivity of water. 4.7.2 When using different gases to generate plasma and requiring the use of corresponding electrodes, the name or chemical symbol of the gas should be marked on the corresponding electrode or its outer cover ||tt| |4.7.3 In the instructions provided with the spray gun, all data and wiring and piping diagrams required for operation should be given. 4.8 Radio interference
The design of the power supply and arc ignition system of the spray gun should comply with the current national regulations. Regulations on interference allowable values. 5 Operation and maintenance 3
5.1 Overview
The operation and maintenance of plasma equipment should comply with GB5959.1. Various safety work procedures specified. Sites where plasma equipment is used should take effective protective measures and clean them frequently to prevent the accumulation of metal powder, so as to reduce harm to operators and pollution to the surrounding environment. During the operation of the equipment, the working conditions of the operators should comply with the current national safety regulations (for example: in terms of toxic substances, high temperature, radiation and noise, etc.).
5.2 Protective tools for operators
Operators of spray guns should wear necessary protective equipment (such as work clothes, gloves, isolation masks that can protect the eyes from heat, glare, ultraviolet and infrared radiation, and suitable insulated shoes, etc.). In addition, appropriate measures should be taken to prevent noise (such as wearing ear protectors). The workplace should be effectively screened to protect nearby workers. 5.3 Startup and shutdown
Adoption instructions:
1) Corresponds to IEC519-5 Article 3.7.1 "Distribution device", but the original text is: "Wire or powder distributors shall comply with the following existing regulations Rules and standards; electrical connection; connection to gas pressure pipeline; connection to spray gun. "If there is no following clause, this standard divides this clause into clauses 4.6.1 and 4.6.2. 2) Corresponds to Articles 3.8.1 and 3.8.3 of IEC519-5, but the original text also has a description of "(see ISO/R700)". 3] Corresponds to IEC519-5 Chapter 4 and 5. 4) This paragraph does not exist in the original text of IEC519-5.
GB5959.5—91
The operations necessary to start and shut down the equipment should be carried out in a sequence that ensures work safety. The coolant and gas supplied to the spray gun should be adjusted before arc ignition. Before work, test the ground leakage switch first. Coolant and gas should be supplied in advance before arc ignition, and the coolant and gas should be shut off after the electrode voltage is cut off. The safety device should be able to eliminate any errors in the specified operating procedures, and signs should be marked near the equipment. Operating procedures and precautions. 5.4 Protection from toxic substances that may be generated during spray gun operation. For toxic compounds generated during operation, the user should take effective measures to eliminate them. Within the breathing range of the operator, the concentration of toxic compounds should be lower than the limit allowed by relevant national standards. value\. 5.5 Protection against overheating (for manual-operated spray gun equipment) When using a spray gun, the temperature of any part that the operator needs to touch will not cause harm to the operator. 5.6 Protection of water pipes, air pipes and cables
All lines and piping between the spray gun and fixed parts of the equipment should be protected at all times. In view of the possible damage caused by accidental splashing of hot particles, the insulation performance of the cables and the condition of the tubes must be regularly checked for timely replacement to ensure work safety.
6 Safety requirements for plasma furnace equipment
Plasma furnaces are divided into fixed and mobile types, and it is impossible to give all the safety requirements for them. The safety requirements for the design, installation, operation and maintenance of plasma furnace equipment should refer to the relevant provisions in the front of this standard and the relevant provisions in GB5959.2, and be specified in the product standards. It should be noted that plasma furnaces and electric arc furnaces have different atmospheres. Instructions for use:
1] The last sentence of Article 4.4 of IEC519-5 is: "The concentration of the compound is lower than the recognized concentration." Measurement of A1 insulation resistance
GB5959.591
Appendix A
Measurement of insulation resistance and dielectric strength test (supplement)
Measuring application of plasma gun insulation resistance It is carried out under the conditions specified below. Water should be flowing in the cooling pipeline during measurement. For generally insulated parts, the insulation resistance should not be less than 2MQ. For reinforced insulation and parts that may be held by hand when using the plasma gun, the insulation resistance should not be less than 7M2.
The conditions for this measurement are as follows:
a. Apply a DC voltage of 500V between the primary and secondary coils of the transformer and between live parts and accessible metal parts for 1 minute. There shall be no Breakdown phenomenon;
b. Wrap a metal foil with a size of no more than 200mm × 100mm on the outer surface of the external insulator, and then apply a DC voltage of 500V between the live parts and the metal foil for 1 minute. There is a breakdown phenomenon. Note: During the test, electronic components that cannot withstand this voltage are allowed to be removed or short-circuited. The insulation resistance should be no less than 2MQ. A2 Dielectric strength test
The plasma gun dielectric strength test should be carried out under the conditions specified below. The test should be carried out between the live parts and the external parts of the reinforced insulation (during the test, metal foil is attached to the outer surface of the external insulation), and the test voltage is 4000V. In addition to these requirements, the plasma gun should also meet the test under high-frequency arcing voltage. When the electrode gap is the maximum allowable value specified by the manufacturer, there should be no high voltage between other parts of the gun except between two electrodes. Frequency current flows. The conditions for this test are as follows:
Apply a power frequency of 50Hz, basically a sine wave, and its value is the voltage specified below, for 1 minute, and there should be no flashover or breakdown.
b.
At the beginning of the test, the applied voltage is less than half of the specified value, and then gradually rises to the test value within 10 seconds. The test voltage is specified as follows:
c.
(a) For equipment with a rated voltage lower than or equal to 50V, the test voltage is 500V; (b) For equipment with a rated voltage U greater than 50V, the test voltage It is 2U+1000V (minimum 1500V). d. This test is carried out at the following locations
(a) between the contacts of the power switch in the off position; (b) between the primary and secondary coils of the transformer and between live parts and accessible metal parts ; (c) Between live parts and the metal foil covering the outer surface of the external insulator. Note: ① During the test, some resistors connected to the frame in the high-frequency circuit are allowed to be disconnected. ② During the test, electronic components and capacitors that cannot withstand this voltage are allowed to be removed or short-circuited. ③Leakage phenomena that do not affect the voltage drop can be ignored. Additional notes:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Industrial Electric Heating Equipment Standardization Technical Committee. This standard is drafted by Xi'an Electric Furnace Research Institute, Chengdu Electric Welding Machine Research Institute, and Wuhan Material Protection Research Institute. The main drafters of this standard are Pan Binyun, Li Liansheng, Liu Hong, Zhang Ruichang, Jin Shuzhen and Gao Rongfa.6 Protection of water pipes, air pipes and cables
All lines and piping between the spray gun and fixed parts of the equipment should be protected regularly. In view of the possible damage caused by accidental splashing of hot particles, the insulation performance of the cables and the condition of the tubes must be regularly checked for timely replacement to ensure work safety.
6 Safety requirements for plasma furnace equipment
Plasma furnaces are divided into fixed and mobile types, and it is impossible to give all the safety requirements for them. The safety requirements for the design, installation, operation and maintenance of plasma furnace equipment should refer to the relevant provisions in the front of this standard and the relevant provisions in GB5959.2, and be specified in the product standards. It should be noted that plasma furnaces and electric arc furnaces have different atmospheres. Instructions for use:
1] The last sentence of Article 4.4 of IEC519-5 is: "The concentration of the compound is lower than the recognized concentration." Measurement of A1 insulation resistance
GB5959.591
Appendix A
Measurement of insulation resistance and dielectric strength test (supplement)
Measuring application of plasma gun insulation resistance It is carried out under the conditions specified below. Water should be flowing in the cooling pipeline during measurement. For generally insulated parts, the insulation resistance should not be less than 2MQ. For reinforced insulation and parts that may be held by hand when using the plasma gun, the insulation resistance should be not less than 7M2.
The conditions for this measurement are as follows:
a. Apply a DC voltage of 500V between the primary and secondary coils of the transformer and between live parts and accessible metal parts for 1 minute. There shall be no Breakdown phenomenon;
b. Wrap a metal foil with a size of no more than 200mm × 100mm on the outer surface of the external insulator, and then apply a DC voltage of 500V between the live parts and the metal foil for 1 minute. There is a breakdown phenomenon. Note: During the test, electronic components that cannot withstand this voltage are allowed to be removed or short-circuited. The insulation resistance should be no less than 2MQ. A2 Dielectric strength test
The plasma gun dielectric strength test should be conducted under the conditions specified below. The test should be carried out between the live parts and the external parts of the reinforced insulation (during the test, metal foil is attached to the outer surface of the external insulation), and the test voltage is 4000V. In addition to these requirements, the plasma gun should also meet the test under high-frequency arcing voltage. When the electrode gap is the maximum allowable value specified by the manufacturer, there should be no high voltage between other parts of the gun except between two electrodes. Frequency current flows. The conditions for this test are as follows:
Apply a power frequency of 50Hz, basically a sine wave, and its value is the voltage specified below, for 1 minute, and there should be no flashover or breakdown.
b.
At the beginning of the test, the applied voltage is less than half of the specified value, and then gradually rises to the test value within 10s. The test voltage is specified as follows:
c.
(a) For equipment with a rated voltage lower than or equal to 50V, the test voltage is 500V; (b) For equipment with a rated voltage U greater than 50V, the test voltage It is 2U+1000V (minimum 1500V). d. This test is carried out at the following locations
(a) between the contacts of the power switch in the off position; (b) between the primary and secondary coils of the transformer and between live parts and accessible metal parts ; (c) Between live parts and the metal foil covering the outer surface of the external insulator. Note: ① During the test, some resistors in the high-frequency circuit connected to the frame are allowed to be disconnected. ② During the test, electronic components and capacitors that cannot withstand this voltage are allowed to be removed or short-circuited. ③Leakage phenomena that do not affect voltage drop can be ignored. Additional notes:
This standard is proposed by the Ministry of Mechanical and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Industrial Electric Heating Equipment Standardization Technical Committee. This standard is drafted by Xi'an Electric Furnace Research Institute, Chengdu Electric Welding Machine Research Institute, and Wuhan Material Protection Research Institute. The main drafters of this standard are Pan Binyun, Li Liansheng, Liu Hong, Zhang Ruichang, Jin Shuzhen and Gao Rongfa.6 Protection of water pipes, gas pipes and cables
All lines and pipes between the spray gun and the fixed part of the equipment should be protected regularly. In view of the possible damage caused by accidental sputtering of hot particles, the insulation performance of the cable and the condition of the pipe must be checked regularly so that they can be replaced in time to ensure work safety.
6 Safety requirements for plasma furnace equipment
Plasma furnaces are divided into fixed and mobile types. It is impossible to give all their safety requirements. The safety requirements for the design, installation, operation and maintenance of plasma furnace equipment should refer to the relevant clauses in the previous section of this standard and the relevant clauses in GB5959.2, and be specified in the product standard. It should be noted that plasma furnaces and arc furnaces have different atmospheres. Adoption instructions:
1] The last sentence of Article 4.4 of IEC519-5 is: "The concentration of the compound is lower than the recognized concentration." A1 Measurement of insulation resistance
GB5959.591
Appendix A
Measurement of insulation resistance and dielectric strength test (supplement)
The measurement of insulation resistance of plasma gun shall be carried out under the following conditions, and water shall be passed through the cooling pipe during measurement. For parts with general insulation, the insulation resistance shall not be less than 2MQ. For parts with reinforced insulation and parts that may be held by hand when using plasma gun, the insulation resistance shall not be less than 7M2.
The measurement conditions are as follows:
a. Apply a DC voltage of 500V between the primary and secondary coils of the transformer and between the live parts and the accessible metal parts for 1 minute, and there shall be no breakdown phenomenon;
b. Wrap the outer surface of the external insulating part with a metal foil of a size not greater than 200mm×100mm, and then apply a DC voltage of 500V between the live parts and the metal foil for 1 minute, and there shall be no breakdown phenomenon. Note: During the test, electronic components that cannot withstand this voltage are allowed to be removed or short-circuited. The insulation resistance should be not less than 2MQ. A2 Dielectric Strength Test
The dielectric strength test of the plasma gun should be carried out under the following conditions. The test should be carried out between the live parts and the external parts of the reinforced insulation (during the test, the metal foil is attached to the outer surface of the external insulation), and the test voltage is 4000V. In addition to these requirements, the plasma gun should also meet the test under high-frequency arc voltage. When the electrode gap is the maximum allowable value specified by the manufacturer, there should be no high-frequency current flowing between other parts of the gun except between the two electrodes. The conditions of this test are as follows:
Apply a power frequency of 50Hz, basically a sine wave, and its value is as specified below. The voltage lasts for 1min, and no flashover or breakdown should occur.
b.
At the beginning of the test, the applied voltage is less than half of the specified value, and then gradually increases to the test value within 10s. The test voltage is specified as follows:
c.
(a) For equipment with a rated voltage less than or equal to 50V, the test voltage is 500V; (b) For equipment with a rated voltage U greater than 50V, the test voltage is 2U+1000V (minimum 1500V). d. This test is carried out at the following positions
(a) Between the contacts of the power switch in the off position; (b) Between the primary and secondary coils of the transformer and between the live parts and the accessible metal parts; (c) Between the live parts and the metal foil wrapped on the outer surface of the external insulating parts. Note: ① During the test, it is allowed to disconnect some resistors connected to the frame in the high-frequency circuit. ② During the test, electronic components, capacitors, etc. that cannot withstand this voltage are allowed to be removed or short-circuited. ③ Leakage phenomena that do not affect the voltage drop can be ignored. Additional notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Industrial Electric Heating Equipment. This standard was drafted by Xi'an Electric Furnace Research Institute, Chengdu Electric Welding Machine Research Institute, and Wuhan Material Protection Research Institute. The main drafters of this standard are Pan Binyun, Li Liansheng, Liu Hong, Zhang Ruichang, Jin Shuzhen, and Gao Rongfa.
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