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GB/T 41635-2022Guide for the finite element calculation of electric field distribution for the electric equipment in high altitude area (English PDF)

高海拔电气设备电场分布有限元计算导则

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 11, 2022

Implementation date

February 1, 2023

Scope

GB/T 41635-2022 is the English-translated version of 高海拔电气设备电场分布有限元计算导则.

GB/T 41635-2022 guides the finite element calculation of the electric field around electrical equipment used between 1000 m and 4000 m altitude; lower down it serves as a reference.

It sets out the types of calculation, the basic principles and process, the rules for building the model, the effect of the high altitude climate, the correction of withstand voltage and creepage distance, and the factors and deviations that bear on the result.

An electrostatic calculation suits DC or power frequency voltage; a transient calculation suits lightning and switching impulses, very fast transient overvoltage and polarity reversal.

Four annexes cover the principles, the climatic effects, common parameters and the assessment of numerical results. It cites GB/T 311.1-2012, GB/T 2900.71-2008, GB/T 16927.1-2011, GB 19517-2009 and GB/T 33582-2017. Issued on 11 July 2022, it has applied since 1 February 2023.

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Document preview — GB/T 41635-2022

National Standard of the People's Republic of China

ICS: 29.020
Classification: K 40

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Calculation Type
5 Basic principles and processes
6 General Requirements
7 General rules for establishing finite element electric field model
8 Influence of high altitude climatic environment on electrical equipment
9 High Altitude Withstand Voltage and Creepage Distance Correction Method
10 Outcome Influencing Factors
11 Deviation and result judgment
Appendix A (Informative) Basic Principles and Processes of Finite Element Calculation of Electric Field Distribution of High Altitude Electrical Equipment
Appendix B (informative) Impact of high altitude climatic environment on electrical equipment
Appendix C (normative) Selection of common parameters
Appendix D (normative) Determination of finite element numerical results

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 of Standardization Documents" drafted.

1 Scope

This document gives the calculation type, basic principle and process, general requirements, finite element calculation of electric field distribution of high-altitude electrical equipment General rules for establishing element electric field model, influence of high altitude climatic environment on electrical equipment, high altitude withstand voltage and creepage distance correction method, Result influencing factors, deviation and result judgment.

This document is applicable to the finite element calculation of electric field distribution of electrical equipment used in areas with an altitude of 1000m~4000m. Altitude 1000m The finite element calculation of the electric field distribution of electrical equipment used in the following areas can be performed by reference.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 311.1-2012 Insulation coordination - Part 1: Definitions, principles and rules

GB/T 2900.71-2008 Electrical terminology electrical installations

GB/T 16927.1-2011 High Voltage Test Technology Part 1: General Definition and Test Requirements

GB 19517-2009 National Electrical Equipment Safety Technical Specification

GB/T 33582-2017 General rules for finite element mechanical analysis of mechanical product structures

3 Terms and Definitions

GB/T 2900.71-2008, GB/T 16927.1-2011, GB 19517-2009, GB/T 33582-2017 and the following Listed terms and definitions apply to this document.

3.1 Dielectric strength

The highest electric field strength that a material can withstand under the action of an electric field to avoid being damaged (breakdown).

4 Calculation Types

4.1 Electrostatic field calculation

If the operating voltage and frequency of electrical equipment are low, such as DC voltage or power frequency voltage, the wavelength of electromagnetic waves is much larger than the characteristic scale of the equipment, an electrostatic field analysis should be used.

4.2 Transient electric field calculation

If it is necessary to study the electric field distribution of electrical equipment under transient electrical stress conditions, the transition process should be added, and the test voltage should be corrected.

The entire waveform value. Such as lightning impulse voltage (LI), operating impulse voltage (SI), fast transient overvoltage (VFTO), polarity reversal, etc.

The above transient electrical stress includes multiple frequency components, and the transient electric field analysis should be used instead of the electrostatic field simulation calculation results.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 19 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 311.1-2012

Similar standards

GB/T 13869-2026|GB/T 24114.2-2026|GB/T 33589-2026|GB/T 33592-2026|GB/T 33593-2026|GB/T 33603-2026

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