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Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 38659.2-2021: Electromagnetic compatibility - Risk assessment - Part 2: Electronic and electrical systems Status: Valid
Basic dataStandard ID: GB/T 38659.2-2021 (GB/T38659.2-2021)Description (Translated English): Electromagnetic compatibility - Risk assessment - Part 2: Electronic and electrical systems Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: L06 Word Count Estimation: 44,456 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 38659.2-2021: Electromagnetic compatibility - Risk assessment - Part 2: Electronic and electrical systems---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Electromagnetic compatibility - Risk assessment - Part 2.Electronic and electrical systems ICS 33.100 CCSL06 National Standards of People's Republic of China EMC risk assessment Part 2.Electrical and Electronic System Released on 2021-10-11 2022-05-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee Table of contentsForeword Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms, definitions and abbreviations 1 3.1 Terms and definitions 1 3.2 Abbreviations 5 4 Classification of electrical and electronic systems 5 5 Overview and purpose of EMC risk assessment 5 5.1 Overview of EMC risk assessment 5 5.2 EMC risk assessment purpose 6 6 EMC risk assessment mechanism and ideal model 6 6.1 EMC risk assessment mechanism 6 6.2 The ideal model of EMC risk assessment 7 7 Level of influence of risk elements (assessment points) and risk classification 13 8 Risk identification 15 9 EMC risk analysis 15 9.1 Overview 15 9.2 EMC risk analysis 16 10 EMC risk assessment 21 10.1 EMC risk assessment tool 21 10.2 EMC risk assessment value calculation 21 10.3 Application of EMC risk assessment values 21 11 Presentation of EMC risk assessment results 23 11.1 Overview 23 11.2 EMC risk assessment assessment report 23 11.3 EMC risk assessment assessment label 23 Appendix A (informative) Ideal model for EMC risk assessment of vehicle systems 24 Appendix B (informative) EMC risk level of auto parts 29 Appendix C (informative) Vehicle EMC risk level 30 Appendix D (informative) Ideal model for EMC risk assessment of medical electrical systems 31 Appendix E (informative) Significance of EMC risk assessment technology application 38 Reference 39 EMC risk assessment Part 2.Electrical and Electronic System1 ScopeThis document gives an overview and purpose of the risk assessment of electromagnetic compatibility (EMC) of electrical and electronic systems, as well as the mechanism and theory of EMC risk assessment. Thinking model, risk element impact level and risk classification, EMC risk identification, EMC risk analysis, EMC risk evaluation, risk assessment Reporting requirements. This document is applicable to the EMC risk assessment of electrical and electronic systems. Note. The electrical and electronic systems of this document include engineering and medical equipment, road vehicles, ships, etc., applicable to the radio frequency range.2 Normative referencesThe content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 4365 Electrotechnical terminology electromagnetic compatibility GB /Z 18039.1-2019 Electromagnetic compatibility environment Description and classification of electromagnetic environment GB/T 23694 Risk Management Terminology GB /Z 37150 EMC Reliability Risk Assessment Guidelines GB/T 38659.1-2020 Electromagnetic Compatibility Risk Assessment Part 1.Electronic and Electrical Equipment 3 Terms, definitions and abbreviations 3.1 Terms and definitions GB/T 4365, GB/T 23694, GB/T 38659.1-2020 and GB /Z 37150 and the following terms and definitions apply In this document. 3.1.1 Risklevel In the risk assessment, the classification of risk elements. 3.1.2 Electronicandelectricalsystems A system composed of a number of relatively independent and interrelated electrical and electronic equipment or electrical and electronic equipment and components. Note. According to the equipment classification of CISPR, the following equipment belongs to the electrical and electronic system. road vehicles, computers separated from the display and host, and separated indoor and outdoor units Air conditioners, industrial robots, etc. 3.1.3 Ful-integrationelectronicandelectricalsystems A system composed of a number of relatively independent and interrelated electrical and electronic equipment. Note. Each is a complete electrical and electronic equipment. 3.2 Abbreviations The following abbreviations apply to this document. CISPR. International Special Committee on Radio Interference (InternationalSpecialCommitteeonRadioInterference) EMC. Electromagnetic Compatibility (ElectromagneticCompatibility) EMI. Electromagnetic Interference (Electromagnetic Interference) EMS. Electromagnetic Susceptibility (ElectromagneticSusceptibility) EUT. Equipment Under Test (EquipmentUnderTest) LISN. Line Impedance Stabilization Network (LineImpedanceStabilizationNetwork) PWM. Pulse Width Modulation (PulseWidthModulation)4 Classification of electrical and electronic systemsIn order to achieve the purpose of identifying the risk elements of EMC risk assessment, the electrical and electronic systems within the scope of this document. ---According to the connection mode, it can be divided into. ● Class I electrical and electronic systems. electrical and electronic systems without external cables, such as non-plug-in vehicles; ● Class Ⅱ electrical and electronic systems. electrical and electronic systems with external power cables, communication cables and other external cables, such as plug-in vehicle. ---According to the degree of integration, it can be divided into. ● Fully integrated electronic and electrical system (3.1.3); ● Semi-integrated electronic and electrical system (3.1.4).5 Overview and purpose of EMC risk assessment5.1 Overview of EMC risk assessment The risk assessment of electrical and electronic systems is a complete process consisting of risk identification, risk analysis and risk evaluation. Department of Electronic and Electrical System EMC risk assessment aims to provide evidence-based information and analysis for effective EMC risk response in electrical and electronic systems. Electronic electricity The EMC risk assessment of the gas system is based on the information evidence of the system and analyzes its potential EMC risks. EMC of the system in this document The risk level corresponds to the risk of EMC test failure. The system is relative to a single device. Electronic and electrical equipment is a single packaged equipment, its equipment composition, number of cables, and coupling relationship It is relatively simple, and the electronic and electrical system includes multiple electronic and electrical equipment, such as automobiles, ships, aircrafts, etc., which are all electronic and electrical systems. See Appendix A for an example of EMC risk assessment for a complete vehicle. The EMC risk assessment of electrical and electronic systems is established on all equipment or components in the assessed system to complete the EMC risk assessment or inspection Under the premise of the test, follow the procedures specified in GB /Z 37150 to analyze the mechanical architecture of the system, interconnect cable processing, and crosstalk between cables. Conduct EMC risk assessment to obtain the EMC design risk level and risk value of the entire system. EMC risk assessment of auto parts and complete vehicles See Appendix B and Appendix C for the assessment grade. The EMC risk assessment of the fully integrated electrical and electronic system is established on the basis that all equipment in the assessed system has completed the EMC risk assessment or EMC Under the premise of the test, the risk assessment method of the equipment is obtained according to GB/T 38659.1-2020, and the risk assessment result of electrical and electronic equipment And the risk value is one of the risk assessment elements of the risk assessment of electronic and electrical systems. The semi-integrated electronic and electrical system needs to carry out EMC for the parts of the incomplete equipment in the system according to the method of GB/T 38659.1-2020 Risk assessment to obtain the EMC risk assessment level and risk value of the component, and then combine the relevant risk elements of the system and all other devices in the system. The EMC risk assessment results prepared, comprehensively obtain the EMC risk level and risk assessment value of the entire system. Note. The equipment EMC risk value and equipment EMC risk level are closely related to the application environment of the equipment corresponding to the system or the level of EMC testing. 5.2 The purpose of EMC risk assessment The main purposes of EMC risk assessment for electrical and electronic systems include. ---Understand the EMC risk elements of electrical and electronic systems and their potential impact on the target; ---Improve the understanding of EMC risks of electrical and electronic systems to facilitate the selection of correct risk response strategies; ---Identify those weak links that lead to EMC risks in electrical and electronic systems; ---Help to determine whether the EMC risk is acceptable; ---Provide relevant information for system design decision makers. A successful EMC risk assessment of electrical and electronic systems relies on a full understanding of the design information of the equipment being assessed and the determination of relevant risk elements. Fully understand.6 EMC risk assessment mechanism and ideal model6.1 EMC risk assessment mechanism The EMC risks of electronic and electrical systems include electromagnetic susceptibility (EMS) and electromagnetic interference (EMI). Said that its risk assessment mechanism is to evaluate the size of the common mode current injected into the device port in the system. Different system design schemes have different The large and small common mode current flows through the device ports in the system, and the system can be evaluated by judging the common mode current flowing in and out of the subsystem ports. Designed EMC immunity risk. The factors that affect the size of this common mode current in the system design are the risk factors for the EMS of the electronic and electrical system. Prime (assessment point). By evaluating the design of ports, cables, housings, grounding, etc., the size and possibility of common mode interference flowing through the equipment in the system can be evaluated, and the system can be found The defects of the system structure design are provided, and the improvement direction is provided to guide the structure design. The EMC risk assessment of electrical and electronic systems is based on the classification of various cables in the system. When external common mode interference (common mode Interference can be regarded as a source of interference based on the reference ground or the earth) When coupled to a certain cable in the system, it flows in a loop according to the current According to the law, common mode interference is always injected into the cable of a certain device in the system, and finally passes through various paths that can form a loop with the reference ground or the earth. Return to the reference ground or ground to form a closed current loop. The process of injecting interference from somewhere until returning to the reference ground or the earth can be equivalent to A voltage source is applied to one or more loads (each loop or parasitic loop in the EUT), and the current flows to each load, each load The magnitude of the current flowing on is determined by the magnitude of the load impedance. The principle of common-mode current generated by common-mode interference on each loop of the device is shown in Figure 2. b) Noise signal line. PWM signal line, motor power line signal line (including three-phase power line and brake signal line), clock signal Signal wire, ignition signal wire, welding signal wire; c) Power cord. AC power supply cord, DC power supply cord; d) General signal line. digital control signal, non-periodic digital communication signal, switch signal. 6.2.3.2 A1.EMS related cable attributes Although, in theory, if the EMS risk level of all the equipment in the electronic and electrical system is W or the EMC required by the corresponding standard of the equipment If the test is passed, no matter what kind of signal cable is in the system, the system is still a low EMS risk system, but due to the existence of In the case of sensitive signal lines, the layout of the equipment in the actual system (such as cable layout, grounding, etc.) will affect the EMC performance of the evaluated system. Therefore, in the ideal model of EMS risk assessment for electronic and electrical systems. a) The cables should be arranged in accordance with the requirements of the equipment during the equipment EMS risk assessment, and; b) There are no cables for sensitive signals. 6.2.3.3 A2.EMI-related cable attributes Although, in theory, if the EMI risk level of all the equipment in the electronic and electrical system is W or the equipment corresponds to the EMI required by the standard If the test is passed, no matter what kind of signal cable is included in the system, the system is still a low EMI risk system, but due to the existence of In the case of noisy signal lines, the layout of the equipment in the actual system (such as cable layout, grounding, etc.) will affect the EMI performance of the evaluated system. Therefore, in the ideal model for EMI risk assessment of electronic and electrical systems. a) The cables should be arranged in accordance with the requirements of the equipment during the EMI risk assessment of the equipment, and; b) There are no cables with noisy signals. 6.2.4 Risk assessment element B. Cable EMC device 6.2.4.1 Overview The cable EMC device is a device placed on the cable to increase the cable common mode impedance or bypass the common mode current on the cable, such as in the cable The shielding layer on the upper side, the ferrite magnetic ring, and the filter connected in series on the cable (the filter installed on the PCB board belongs to the internal components of the device) Wait. It can reduce the transmission of interference signals inside the equipment in the system to the system, and at the same time can reduce the electromagnetic field of the cables in the electronic and electrical system. Interfering signals coupled in the system flow into the equipment in the system. Note. The EMC devices involved in this element do not include the EMC devices that come with the components in the system (such as power filters, shielded cables, magnetic rings, etc.). 6.2.4.2 B1.EMS-related cable EMC device In the ideal model of the electrical and electronic system, the EMS risk level or risk value of the connected equipment should be used to determine whether the equipment is required. Set, the attenuation value of the EMC device should be able to reduce the EMS risk level or risk value of the connected equipment, so that the risk level of the connected equipment Or the risk value reaches the required risk value of the equipment after adding the EMC device. See Table 1 for specific requirements. 6.2.5 Risk assessment element C. cable shielding The existence of a shielded cable will cause the interference current to flow into the signal line to be transferred to the shielding layer, and the cable shielding will reduce the flow into the cable. And the common mode interference current on the PCB. In the ideal model, those equipment whose risk assessment level cannot reach W should be equipped with EMC devices (including shielding treatment). for Give full play to the shielding effectiveness of the cable shielding layer and reduce the pigtail effect of the shielding layer connection line (Pigtail). The processing of the cable shielding layer in the ideal model should be full Meet the following requirements. a) For metal enclosure equipment. 1) The cable shielding layer is connected to the grounded metal plate or metal connector shell at the connector entrance, and; 2) 360° overlap of the shielding layer and the metal shell. b) For plastic enclosure equipment. 1) The cable shielding layer is connected to the 0V ground plane at the interface of the connected PCB board, and; 2) 360° overlap between the shielding layer and the 0V ground plane at the interface of the PCB board. 6.2.6 Risk assessment element D. equipment grounding In order to allow common mode interference (current) to flow to the ground nearby, to prevent common mode current from flowing through the device and entering the system, and to pass the interference to the latter Class equipment or cables, the equipment grounding in the ideal model should meet the following requirements. a) The equipment should have a grounding wire, and; b) The grounding wire of the metal chassis equipment is outside the metal chassis, and the grounding wire of the plastic housing equipment is near all cables, and; c) The length-to-width ratio of the grounding conductor is less than 5. 6.2.7 Risk assessment element E. Crosstalk between power line and general signal line The cable crosstalk model is shown in Figure 4.The degree of crosstalk between cables is related to the parasitic capacitance and parasitic inductance between the cables. The greater the capacitance and parasitic inductance, the greater the coupling interference, and the size of the parasitic inductance and parasitic capacitance and the distance between the cable and the distance between the cable and the ground The prevention of crosstalk between cables should occur between cables with different attributes. Effective method of passing parasitic parameters. In the ideal model, the power line and the general signal line should be treated to prevent crosstalk. The following measures can be considered to adopt the method of preventing crosstalk. a) The distance between cables is more than 0.5m, or; b) Vertical wiring between cables, or; c) At least one of the cables arranged in parallel is a shielded cable. 6.2.8 Risk assessment element F. Crosstalk between power line and special signal line 6.2.8.1 F1.Crosstalk between EMS-related cables In the ideal model, the power line and the sensitive signal line should be treated to prevent crosstalk. 6.2.8.2 F2.EMI-related crosstalk between cables In the ideal model, the power line and the noise signal line should be treated to prevent crosstalk. The following measures can be considered to be the method of preventing crosstalk. a) The distance between cables is more than 0.5m, or; b) Vertical wiring between cables, or; c) At least one of the cables arranged in parallel is a shielded cable. 6.2.9 Risk assessment element G. Crosstalk between general signal lines and special signal lines 6.2.9.1 G1.Crosstalk between EMS-related cables In the ideal model, the general signal line and the sensitive signal line should be processed to prevent crosstalk. 6.2.9.2 G2.EMI-related crosstalk between cables In the ideal model, the general signal line and the noise signal line should be treated to prevent crosstalk. The following measures can be considered to be used to prevent crosstalk Methods. a) Vertical wiring between cables, or; b) At least one of the cables arranged in parallel is a shielded cable. 6.2.10 Risk assessment element H. Crosstalk between sensitive signal lines and noise signal lines In the ideal model, the sensitive signal line and the noisy signal line should be treated to prevent crosstalk......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 38659.2-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 38659.2-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 4 ~ 6 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 38659.2-2021_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 38659.2-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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