GB/T 42397-2023 English PDF

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GB/T 42397-2023: Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects
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Basic data

Standard ID: GB/T 42397-2023 (GB/T42397-2023)
Description (Translated English): Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K13
Classification of International Standard: 29.060.20
Word Count Estimation: 14,147
Date of Issue: 2023-03-17
Date of Implementation: 2023-10-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42397-2023: Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects

---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.
ICS 29.060.20 CCSK13 National Standards of People's Republic of China Calculation of allowable short-circuit current when considering non-adiabatic effect (IEC 60949.1988, IDT) Released on 2023-03-17 2023-10-01 implementation State Administration for Market Regulation Released by the National Standardization Management Committee

table of contents

Preface I 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 symbols 1 5 Calculation of allowable short-circuit current 2 6 Calculation of short-circuit current by adiabatic method 2 7 Short circuit final temperature calculation 3 8 Calculation of non-adiabatic correction factors for conductors and wire shields (with gaps) 3 9 Calculation of metal sheath, shielding layer and armor layer non-insulation correction factor 6 Appendix A (informative) Explanation of the calculation method of the allowable short-circuit current when considering the non-adiabatic effect 9 Reference 11 Figure 1 Relationship between correction factor ε and Mt of metal sheath, shielding layer and armor layer7 Table 1 Relevant values3 Table 2 Thermal constants of materials4 Table 3 Conductor and wire shielding simplified formula calculation constant 5

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 identically adopts IEC 60949.1988 "Calculation of allowable short-circuit current when considering non-adiabatic effect". This document adds three chapters of "Scope", "Normative References" and "Terms and Definitions". The following minimal editorial changes have been made to this document. ---Incorporated the amendments of IEC 60949.1988/Amd1.2008, the outer margin position of the terms involved is vertical Double lines (‖) are marked. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Electrical Equipment Industry Association. This document is under the jurisdiction of the National Wire and Cable Standardization Technical Committee (SAC/TC213). This document is drafted by. Shanghai Electric Cable Research Institute Co., Ltd., Jiangsu Shangshang Cable Group Co., Ltd., Jinbei Electrician Hengyang Cable Co., Ltd. Company, Zhongtian Technology Submarine Cable Co., Ltd., Far East Cable Co., Ltd., Hangzhou Cable Co., Ltd., Hainan Witt Electric Group Co., Ltd. Company, Zhejiang Chenguang Cable Co., Ltd., TBEA Shandong Luneng Taishan Cable Co., Ltd., Shanghai Huapu Cable Co., Ltd., Ningbo Dongfang Cable Co., Ltd., Chongqing Taishan Cable Co., Ltd., Wuxi Jiangnan Cable Co., Ltd., Zhongchen Cable Co., Ltd., Shandong Taikai Cable Co., Ltd., Guangzhou Lingnan Cable Co., Ltd., State Grid Jiangsu Electric Power Research Institute, China Datang Group Science and Technology Research Institute Co., Ltd. Zhongnan Electric Power Experimental Research Institute, Guangdong Power Grid Co., Ltd. Dongguan Power Supply Bureau, State Grid Heilongjiang Province Electric Power Research Institute of Electric Power Co., Ltd., Guangdong Zhonglian Cable Group Co., Ltd., Zhejiang Yuantong Cable Manufacturing Co., Ltd., Zhejiang Chint Electric Co., Ltd. Cable Co., Ltd., Nanhai Submarine Cable Co., Ltd., Nanyang Cable (Tianjin) Co., Ltd., Weihai Honglin Power Technology Co., Ltd., Zhejiang First Zhou Electronic Technology Co., Ltd. The main drafters of this document. Sun Jiansheng, Xia Junfeng, Li Bin, Hu Shaozhong, Xie Shuhong, Xu Jing, Yang Liwei, Li Ju, Yue Zhenguo, Long Haiyong, Zhou Yan, Chen Lei, Zhou Zhongyi, Ma Zhuang, Xu Qifa, Zhuang Ruhao, Deng Shenghua, Li Chenggang, Li Bin, He Wen, Wang Lei, Ruan Daoming, Jiang Ping, Tao Ruixiang, Liu Ligang, Chen Jianxun, Jia Haifeng, Yan Chuanwen. Calculation of allowable short-circuit current when considering non-adiabatic effect

1 Scope

This document describes the calculation method of the rated short-circuit current of any current-carrying part of the cable, including the adiabatic method and the non-adiabatic method. This document applies to the calculation of the rated short-circuit current of cables.

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. Note. Conductors of GB/T 3956-2008 cables (IEC 60228.2004, IDT) IEC 60287-2-1 Cable ampacity calculation Part 2-1.Calculation of thermal resistance (Electriccables-Calculation of Note. JB/T 10181.21-2014 Cable Ampacity Calculation Part 21.Calculation of Thermal Resistance Thermal Resistance (IEC 60287-2-1.2006, IDT)

3 Terms and Definitions

This document does not have terms and definitions that need to be defined.

4 symbols

The following symbols apply to this document. A --- Considering the thermal performance constant of surrounding or adjacent materials, (mm2/s)1/2. B --- Considering the thermal performance constant of surrounding or adjacent materials, mm2/s. C1 --- The constant of conductor and wire shielding (with gap) when calculated by non-adiabatic formula, mm/m. C2 --- The constant of conductor and wire shielding (with gap) when calculated by non-adiabatic formula, K·m·mm2/J. Dit---The diameter of the hypothetical concentric circle that is exactly tangent to the inner surface of the trough of the corrugated sheath, mm. Doc --- The diameter of the hypothetical concentric circle that is just tangent to the outer surface of the corrugated sheath crest, mm. F --- Consider the factor of imperfect thermal contact. I --- Allowable short-circuit current (effective value during the entire short-circuit period), A. IAD --- short-circuit current calculated by adiabatic method (effective value during the entire short-circuit period), A. ISC --- known maximum short-circuit fault current (effective value during the entire short-circuit period), A. K --- The number related to the carrier material, As1/2/mm2. M --- thermal contact factor, s-1/2. S --- geometric cross-sectional area of the carrier fluid, mm2. X --- Conductor and wire shielding (with gap) constant in the simplified calculation formula, (mm2/s)1/2. Y --- Conductor and wire shielding (with gap) constant in the simplified calculation formula, mm2/s. ......

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