GB/T 38659.4-2022Electromagnetic compatibility—Risk assessment—Part 4: Risk analysis method for system (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.

This document is part 4 of GB/T 38659 "Electromagnetic Compatibility Risk Assessment". GB/T 38659 has released the following parts.

--- Part 1: Electrical and electronic equipment;

--- Part 2: Electrical and electronic systems;

--- Part 3: Equipment risk analysis method;

--- Part 4: System risk analysis method.

Introduction

Electromagnetic compatibility (EMC) risk assessment technology is based on the EMC design method, using general risk assessment methods, according to the risk risk assessment procedures, classify risk levels, and establish ideal models for equipment design (equipment includes electronic and electrical systems and electronic and electrical equipment, electronic and electrical The gas system is composed of multiple electronic and electrical equipment, and the risk assessment of the electronic and electrical system is based on the completed evaluation of the electrical and electronic equipment. Based on the above), determine the risk factors, and then compare the information of the actual design of the equipment with all the risk factors in the ideal model to identify Identify the EMC risk of the equipment, and finally obtain the EMC risk level of the equipment through a specific algorithm through a relatively mature risk assessment technology.

EMC risk level is used to indicate the performance of equipment in response to various EMC phenomena, and it is a new model for equipment EMC performance evaluation.

GB/T 38659 aims to establish EMC risk assessment methods and analysis methods applicable to electrical and electronic equipment and systems. It is proposed to consist of four parts.

--- Part 1: Electrical and electronic equipment. The purpose is to analyze the principles and implementation of the given EMC risk assessment for electrical and electronic equipment method.

--- Part 2: Electrical and electronic systems. The purpose is to give analysis principles and implementation of EMC risk assessment for electrical and electronic systems method.

--- Part 3: Equipment risk analysis method. The purpose is to provide specific operational methods for the risk analysis of electrical and electronic equipment. laws and procedures.

--- Part 4: System risk analysis method. The purpose is to provide specific implementation methods for the risk analysis of electrical and electronic systems. laws and procedures.

The mechanical structure design, interconnection cable design, application environment and other elements of the electrical and electronic system will affect the electromagnetic compatibility risk of the electrical and electronic system. Assessment provides guidance. Engineering personnel have an in-depth understanding of EMC risk assessment techniques and correctly use the EMC risk assessment specified in this document method, which will uncover the black box of EMC design of electronic and electrical systems, and can evaluate the EMC performance of the system, and can also be combined with EMC testing The results are combined with a comprehensive EMC evaluation of electrical and electronic systems.

Designers or users of electrical and electronic systems, through correct EMC risk assessment, can clearly find that the existing system is The advantages, disadvantages and risks of EMC can be used to predict the pass rate of the EMC test of the system, and it can also predict the system in its life. EMC performance at each stage of the cycle.

1 Scope

This document gives the risk assessment values for obtaining risk elements in the electromagnetic compatibility (EMC) risk assessment of electrical and electronic systems, The procedures and methods of risk analysis are required, including the basis of risk analysis, risk analysis procedures, steps and methods of risk analysis.

This document is applicable to the risk analysis in the EMC risk assessment process of electrical and electronic systems.

This document combines the risk factors of the system to provide guidance for the risk analysis method of the electromagnetic compatibility of the system.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, 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/T 7343 Measurement method for suppression characteristics of passive EMC filter devices

GB/T 23694 Risk Management Terminology

GB/Z 37150 EMC Reliability Risk Assessment Guidelines

GB/T 31723.406 Test methods for metallic communication cables Part 4-6: EMC surface transfer impedance line injection method

GB/T 31723.411 Test methods for metallic communication cables - Part 4-11: EMC jumpers, coaxial cable assemblies, connectors Coupling attenuation or shielding attenuation absorbing clamp method for toner cables

GB/T 35033 30MHz~1GHz Electromagnetic shielding material conductivity and metal material lap impedance measurement method

GB/T 38659.1-2020 Electromagnetic Compatibility Risk Assessment Part 1: Electrical and Electronic Equipment

GB/T 38659.2-2021 Electromagnetic Compatibility Risk Assessment Part 2: Electrical and Electronic Systems

IEC 62153-4-4 Test methods for metallic communication cables Part 4-4: Electromagnetic compatibility (EMC) measurement greater than or equal to 3GHz to up to above 3GHz, triaxial method

IEC 62153-4-5 Test methods for metallic communication cables Part 4-5: Electromagnetic compatibility (EMC) coupling or shielding attenuation absorption

3 Terms and Definitions

The following terms and definitions defined in GB/T 4365, GB/T 23694, GB/T 37150 and GB/T 38659.2 apply to this document.

7 Checking of digital prototype and sample product

System risk analysis can be aimed at physical prototypes or digital prototypes. In order to confirm the analyzed digital prototypes, circuit schematic files and Whether the actual physical system is consistent needs to be checked. The content of the check includes at least the following aspects.

---The main size and shape of the chassis;

---The connection relationship between each device in the system and with the chassis, earth and cables;

--- EMC key equipment in the circuit schematic diagram, at least including key equipment/equipment model, filter device model, cable quantity and type etc.

8 Submission of risk analysis results

The process and results of risk analysis for each evaluation unit shall be recorded. The relevant information being analyzed should be presented in understandable terms reached and recorded in the original record.

Analysis results should be recorded in a comprehensive original record, the original record should have enough detail to ensure the correctness of the analysis. Original records should contain at least the following information.

---Objective and scope;

---The relationship between the analyzed object and the risk element assessment value;

--- List the key information of the brand, specification, model and elements of the product;

---Analytical method description;

--- EMC risk analysis process and results;

--- Conclusion and recommendations.