GB/T 25840-2010 English PDF

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GB/T 25840-2010: Guidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 25840-2010	854	Add to Cart	5 days	Guidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals	Valid

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Basic data

Standard ID: GB/T 25840-2010 (GB/T25840-2010)
Description (Translated English): Guidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K30
Classification of International Standard: 29.120.01
Word Count Estimation: 43,480
Date of Issue: 2010-12-23
Date of Implementation: 2011-05-01
Quoted Standard: GB/T 4797.1-2005, GB/T 11021-2007, GB/T 11022-1999, GB/T 11026.1-2003, GB 14048.1-2006, GB 16895.2-2005, IEC 60050-441-1984, IEC 60890-1987
Adopted Standard: IECTR 60943-2009, IDT
Regulation (derived from): Announcement of Newly Approved National Standards No. 10 of 2010 (No. 165 overall)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard is used to guide the operation of electrical equipment in a stable estimate of its component parts under the temperature and temperature rise allowable value. This standard applies to electrical connections and electrical connections nearby materials. This standard relates to the current generated by connecting the thermal effects, thus limiting the application of no voltage. This standard is appropriate only when the reference product standards when applicable. The Technical Committee is responsible for the use of this standard in the standard range of content and manner. This standard "allowed" values ??refer to the relevant product standard allowable value. This standard includes the following: the structure and ohmic electrical contact resistance calculation comprehensive data, contacts the basic aging mechanisms, contact and terminal temperature rise calculations, various components (especially contacts, terminals and terminals connected wires) the maximum "allowed" temperature and temperature rise, products Council regulations allow temperature and temperature rise should follow the normal procedure.

GB/T 25840-2010: Guidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals

---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.
Guidance concerning the permissible temperature rise for parts of electrical equipment, in particular for terminals ICS 29.120.01 K30 National Standards of People's Republic of China Provision of electrical equipment components (especially terminals) Permissible temperature rise Guidelines equipment, inparticularforterminals (IEC /T R60943.2009, IDT) Issued on. 2010-12-23 2011-05-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Preface Ⅰ Introduction Ⅱ 1 Overview 1 2 on the nature of the electrical contact resistance ohmic contacts and calculation and measurement of general considerations 2 Aging mechanism 3 contacts and connecting terminals 6 4-conductor temperature rise, contacts and the connecting terminal 12 is calculated 5 Allow the temperature and the temperature rise 15 Allow 6 to determine the temperature rise and the general procedures to be followed 22 Appendix A (informative) Theory and other digital data, for example 24 Annex B (informative) physical properties of metals and alloys 26 Physical properties of Annex C (informative) fluid medium 28 Annex D (informative) contacts the metal and the gaseous reaction data 29 Annex E (informative) near the terminals by radiation and convection cooling of the conductor temperature rise over 30 Annex F (informative) symbol table used in this standard 36 Annex G (normative) References 38

Foreword

This standard is equivalent to using IEC /T R60943.2009 "provides that the electrical equipment components (especially terminals) allows the temperature rise Guidelines" (Version 2.1). For ease of use, this standard made the following editorial changes. --- Delete foreword international standards; --- According to GB/T 1.1 requirements, delete the international standards set in the articles and the criteria concerning discussion papers and notes; --- The "Report" to "this standard"; --- Table 9 θa and θn position is wrong, they will swap position Table 8 format; --- 5.2.3.3 of "if the temperature rise ΔTe increase 6.5K", where "ΔTe" error, to "ΔTi"; --- Table E.1 and K values \u200b\u200bin Table E.2 and K 'value of 1.0 under the existing "conditions specified in 4.3.1," description. Since no standard 4.3.1 Paragraph, so its deletion; --- Figure E.1 lower figure "T" is wrong, to "T3". The Standard Appendix A, Appendix B, Appendix C, Appendix D, Appendix E, Appendix F and Appendix G is an informative annex. The standard proposed by China Electrical Equipment Industrial Association. This standard by the National Standardization Technical Committee fuse (SAC/TC340) centralized. This standard is drafted by. Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. Participated in the drafting of this standard. electrical switches Manufacturing Co., Ltd. Ningbo, Xiamen Ning Li Electronics Co., Ltd., China Quality Certification Center, the Electrical equipment detected by the sea. The main drafters of this standard. Wu Qingyun. Participate drafters of this standard. Yin Chang, Su Yi town, Lai Wenhui, Lang was built, EASTERN.

Introduction

a) electrical equipment of temperature rise is caused by various losses wires, contacts, and other internal magnetic circuit, with the structure and operation of the equipment Development of new technology, temperature rise issues become increasingly prominent. In the equipment, the temperature rise more and more attention. In these devices, many energy-consuming components (contactors, fuses, electrical Resistors, etc.), especially some modular electrical assembly in a housing made of synthetic material, in which case some of the poor heat dissipation. The temperature rise caused by the basic electrical contact member constituting a relatively high temperature. high temperature accelerated oxidation, increasing the contact resistance of the interface, thereby It leads to further heating, resulting in a higher temperature. If the material constituting the contact without proper or adequate protection, the device pre Before the useful life of the contacts may be irreparably damaged. Temperature also affects the terminals and the wires are connected, in order to ensure that the insulated wire during the life of the equipment remains intact, should be limited Systems on the rise. b) Taking into account the above-mentioned problems, the present standard for the following purposes. --- Analysis of various heating contacts, terminals and wires connected to the terminals (according to their environment and arrangement) occurred And oxidation; --- Products to provide the Committee with the basic rules, so that they can allow a predetermined temperature and temperature rise. c) When the various component parts are housed in the same housing, deal with them to take preventive measures. Users with particular attention to the following facts. terminals by the switching equipment standards specified allowable temperature rise is from a type testing agreement Under testing conditions. These conditions may be encountered in the practical application and conditions vary greatly. Special attention should also be in practical use Insulated wires to the terminals normally connected to the allowable temperature. d) should focus on the following facts. in the relevant product standard external terminals and allows the temperature rise in the convention Type Test Measured, so they may not reflect the normal use of the actual situation. Should take appropriate protective measures to prevent the element terminals near the material exposed to temperatures that may affect their life. Considering the above, the key is the "outside ambient temperature" and "the temperature of the fluid surrounding the element" concept distinguished, the former master Refers to the temperature outside the enclosure, which is coupled with an external ambient temperature of the internal temperature of the element and produce. These concepts and their He added concepts (such as case thermal resistance) the provisions in Chapter 5, and illustrated by the figures, for example. To facilitate the complete calculation, the present standard by introducing the concept of "fill factor" will focus on the fluid temperature of the element and the external surroundings Temperature combined and illustrated in figures (5.2.3.2) specified in the value of the fill factor of several practical applications. Due to the different physical conditions and the degree of contamination of the contact surface, calculations involving a large parameter variation centralized contact resistance. Count alone The resulting accuracy of the count almost equal to the contact resistance of an order of magnitude. As the actual situations often difficult to calculate the deterioration mechanism dominates, it is more accurate values \u200b\u200bin parts of electrical equipment The measured directly. This standard is not used for guiding element derating. This standard is particularly recommended before using this standard data to solve practical problems, to study attached to the back of the reference standard. Provision of electrical equipment components (especially terminals) Permissible temperature rise Guidelines

1 Overview

1.1 Scope and purpose This standard is used to guide the electrical equipment to estimate their component parts and temperature rise allowable value under steady operating conditions. This standard applies to electrical and electrical connections nearby materials. This standard relates to thermal effects generated by the current connection, and therefore no limit to the voltage applied. This standard is appropriate only when the reference product standards apply. The technical committee responsible for the use and scope of the present standard content in the standard. This standard "allowed" value is the relevant product standard allowable value. The criteria include the following. --- Electrical integrated data structure and calculation of the ohmic resistance of the contact; --- Basic aging mechanisms contacts; --- Temperature Calculation contacts and terminals; --- Various elements (in particular contact, terminals and terminals connected to the wires) of maximum "allowed" and the temperature rise; --- Product Board regulations allow the general procedure to be followed for temperature and temperature rise. 1.2 Normative references The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 4797.1-2005 electric and electronic products natural environmental conditions of temperature and humidity (IEC 60721-2-1.2002, MOD) GB/T 11021-2007 heat resistance, electrical insulation rating (IEC 60085.2004, IDT) GB/T 11022-1999 high-voltage switchgear and control equipment standard common technical requirements (eqv IEC 60694.1996) Aging procedures and evaluation of test results. GB/T 11026.1-2003 heat resistance, electrical insulating materials - Part 1 (IEC 60216-1.2001, IDT) GB 14048.1-2006 Low-voltage switchgear and control equipment Part 1. General (IEC 60947-1.2001, MOD) Part 4-42 GB 16895.2-2005 Electrical installations of buildings. Protection against thermal effects --- safety (IEC 60364-4-42. 2001, IDT) IEC 60050 (441). 1984 International Electrotechnical Vocabulary (IEV) Chapter 441. Switchgear and control devices and fuses IEC 60890. 1987 Assessment extrapolation rise type test low-voltage switchgear and control equipment in combination with the parts of the device 1.3 Terms and Definitions The standard terms used and defined in the International Electrotechnical Vocabulary (IEV), the following terms and definitions apply in this standard. 1.3.1 Ambient air temperature ambientairtemperature θa Under specified conditions to determine the temperature of the air around the entire electrical [IEV441-11-13]. Note. for electrical installations in the housing, this temperature is the air temperature outside the enclosure. 1.3.2 (Mechanical switch electrical) contact contact (ofamechanicalswitchingdevice) When the contact member constituting the conductive circuit is turned on, when the operation due to the relative movement of the contacts open or close a circuit, or by contact transfer ......

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