GB/T 18802.331-2024Components for low-voltage surge protection - Part 331: Performance requirements and test methods for metal oxide varistors (MOV) (English PDF)
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
May 28, 2024
Implementation date
September 1, 2024
Scope
GB/T 18802.331-2024 (Components for low-voltage surge protection - Part 331: Performance requirements and test methods for metal oxide varistors (MOV)) is available as an English-translated PDF.
GB/T 18802.331-2024 — This document specifies the power supply, communication and Metal oxide varistors for low voltage surge protectors (SPDs) used to protect equipment and personnel from transient voltages in signaling systems (MOV) performance requirements and test methods.
This document is applicable to single MOV and MOV with thermal protection measures (thermal protection varistor TPV), not applicable to the characteristics given in this document apply to MOVs installed in the test mode and are not applicable to MOVs installed in the test mode.
This document does not consider thermally protected varistors (TPVs) to be SPDs.
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Document preview — GB/T 18802.331-2024
National Standard of the People's Republic of China
- ICS
- 29.240.10
- Classification
- K 30
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Preface
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms, definitions, symbols and abbreviations
- 3.1 Terms and Definitions
- 3.2 Symbols
- 3.3 Abbreviations
- 4 Conditions of use
- 4.1 Operating and storage ambient temperature range
- 4.2 Altitude or atmospheric pressure range
- 4.3 Relative humidity
- 5 Performance Requirements
- 5.1 Product information, appearance and logo
- 5.2 Mechanical performance requirements
- 5.3 Electrical performance requirements
- 6 Test methods, procedures and qualification determination
- 6.1 Standard test conditions and general instructions
- 6.2 Test methods and procedures
- Appendix A (Informative) Comparison of this document with IEC 61643-331:2020 structure number
- Appendix B (Informative) Technical differences between this document and IEC 61643-331:2020 and their causes
- Appendix C (informative) IEC 61051 Varistors for use in electronic equipment
- Appendix D (Informative) MOV tests for Class I, Class II and Class III surge protectors according to GB/T 18802.11-2020
- D.1 Overview
- D.2 MOV Select
- D.3 Symbols, instructions and definitions reference table
- D.4 Action load test
- Appendix E (Informative) Working life identification and maintenance assessment procedures and methods
- E.1 Overview
- E.2 Evaluation procedures and methods for mean time to failure (MTTF) under U/T stress
- E.3 Evaluation procedures and methods for impulse current life
- Reference
- Figure 1 VI characteristics of varistor
- Figure 2 Varistor identification symbol
- Figure 3 Identification symbol of thermal protection varistor
- Figure 4 MOV test procedure Figure
- Figure 5 Varistor voltage (VV) test circuit
- Figure 6 Standby current test circuit
- Figure 7 Test circuit for measuring clamping voltage VC and limiting voltage Vn at nominal discharge current In15
- Figure 8 Nominal discharge current test flow chart
- Figure 9 In test sequence
- Figure 10 Schematic diagram of the TOV withstand time test of MOV and the current limit test of TPV under temporary overvoltage
- Figure 11 Flowchart of the current limiting test under TPV temporary overvoltage
- Figure D.1 Action load test process
- Figure D.2 Test setup for action load test
- Figure D.3 Test flow chart for determining voltage protection level UP
- Figure D.4 Action load timing diagram for Class I and Class II tests
- Figure D.5 Additional action load test timing diagram for Class I test
- Figure D.6 Action load test timing diagram for Class III test
- Figure E.1 U/T stress test device
- Figure E.2 Form of impact life curve
- Figure E.3 Example of life test current for 6 samples (phi20 resistor)
- Table 1 MOV voltage preferred values
- Table 2 Test current values for MOV clamping voltage and limiting voltage tests
- Table 3 MOV test procedure
- Table A.1 Comparison of the structure numbers of this document and IEC 61643-331:2020
- Table B.1 Technical differences between this document and IEC 61643-331:2020 and their causes
- Table D.2 Preferred values for Class I tests
- Table D.3 Preferred values for Class I and Class II tests
- Table D.4 Preferred values of composite wave for Class III test
- Table E.1 MTTF identification test sampling table
- Table E.2 MTTF identification maintenance test sampling table (sampling plan for one failure rate with a confidence level of 10%)
- Table E.3 Impact life characteristics table
- Table E.4 Test current peak IP1, IP2
- Table E.5 Summary of the life times (nind) of each of the six samples
- Table E.6 1 sample life calculation table
- Table E.7 Summary of life calculation results of 6 samples
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 331 of GB/T 18802.GB/T 18802 has been published in the following parts.
--- Low voltage surge protective devices (SPD) Part 11: Performance requirements and test methods for surge protective devices for low voltage power supply systems;
--- Low voltage surge protective devices (SPD) Part 12: Guidelines for the selection and use of surge protective devices for low voltage distribution systems;
--- Low voltage surge protective devices Part 21: Surge protective devices (SPD) for telecommunication and signalling networks Performance requirements and test methods;
--- Low voltage surge protective devices Part 22: Guidelines for the selection and use of surge protective devices for telecommunication and signalling networks;
--- Low voltage surge protective devices Part 31: Performance requirements and test methods for surge protective devices for photovoltaic systems;
--- Low voltage surge protective devices Part 32: Guidelines for the selection and use of surge protective devices for photovoltaic systems;
--- Low voltage surge protective device components Part 311: Performance requirements and test circuits for gas discharge tubes (GDT);
--- Low voltage surge protective device components Part 312: Guidelines for the selection and use of gas discharge tubes (GDTs);
--- Low voltage surge protective device components Part 321: Avalanche breakdown diode (ABD) specification;
--- Low voltage surge protective device components Part 331: Performance requirements and test methods for metal oxide varistors (MOVs);
--- Low voltage surge protective device components Part 341: Surge suppression thyristor (TSS) specification;
--- Low voltage surge protective device components Part 351: Performance requirements and specifications for surge isolation transformers (SIT) for telecommunication and signalling networks experiment method;
--- Low voltage surge protective device components Part 352: Selection and use of surge isolation transformers (SIT) for telecommunication and signalling networks Guidelines.
This document replaces GB/T 18802.331-2007 "Low-voltage surge protector components Part 331: Metal oxide varistors Compared with GB/T 18802.331-2007, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
--- Added the definition of metal oxide varistor (see 3.1.1);
--- Added the definition, abbreviations, performance requirements and test methods of thermal protection varistors (see 3.1.1.2, 3.3, 5.3.12, 6.2.4.12);
--- Added the definition of failure (see 3.1.1.3);
--- Added the definition, abbreviations, performance requirements and test methods of mean time between failures (see 3.1.2.8, 3.3, 5.3.10, 6.2.4.10);
--- Added the definition, performance requirements and test methods of TOV tolerance time (see 3.1.2.9, 5.3.11, 6.2.4.11);
--- Increased the voltage rating of the varistor (see Table 1);
--- Added the test current values for different varistor limiting voltages (see Table 2);
--- Added test methods and procedures for varistors (see 6.2.1);
--- Changed the varistor voltage test method (see 6.2.4.1, 8.4.3 of the 2007 edition);
--- Added the test flow chart of nominal discharge current (see Figure 8);
--- Added the limited current test of thermal protection varistors under temporary overvoltage (see 6.2.4.12).
This document is modified to adopt IEC 61643-331:2020 "Low-voltage surge protective device components Part 331: Metal oxide varistors Performance Requirements and Test Methods.
Compared with IEC 61643-331:2020, this document has more structural adjustments. The structural number comparison table between the two documents is as follows.
See Appendix A.
This document has many technical differences compared to IEC 61643-331:2020.
A single vertical line (|) indicates these differences. A list of these technical differences and their reasons is given in Appendix B.
The following editorial changes were made to this document.
--- Adjusted the position of the introductory words in Chapter 3 and added the introductory words in 3.3;
--- Added Note 1 of 3.1.1.1, Note of 3.1.1.2, Note of 3.1.2.3, Note 2 of 3.1.2.4, Note 1 of 3.1.2.7, Note 1 of 3.1.3.2 and Note 2, Note 5.3.7, Note 8, Delete Note 3.1.2.2, Note 4.1, Note 5.3.2, Note 6.2.4.3, Change
Note to 3.1.3.1;
--- Changed the sign of the maximum single impulse current from ITM to Imax (see 3.1.2.2, Figure 1);
--- Changed the sign of equivalent square wave width from T to tau (see 3.1.2.4);
--- Corrected the marking positions of some symbols in Figure 1;
--- Replaced IEC 60617 (see 3.2) with the informative reference GB/T 4728 (all parts);
--- IEC 60068-1 is replaced by the informative reference GB/T 2421.1 (see 4.2, 4.3);
--- Replaced IEC 60068-2-78 with the informative reference GB/T 2423.3 (see 4.3);
---Adjusted the abbreviations in 3.3, deleted ESD, and added TPV;
---Replaced IEC 61643-11:2011 with the informative reference GB/T 18802.11-2020.
2020 The corresponding referenced clause numbers have been changed (see Appendix D);
--- Changed some preferred values (see Table D.3 and Table D.4);
--- Deleted the informative appendix "Method for determining mean time between failures" (see Appendix D of IEC 61643-331:2020).
Introduction
GB/T 18802 contains the performance requirements and test methods for different types of low-voltage surge protectors and low-voltage surge protector components, and the guidelines for its selection and use are planned to consist of eighteen parts.
--- Low voltage surge protective devices (SPD) Part 1: General performance requirements and test methods. The purpose is to establish Overall performance and safety requirements, tests for SPDs with rated AC voltage not exceeding 1000V or DC voltage not exceeding 1500V and rated values.
--- Low voltage surge protective devices (SPD) Part 11: Performance requirements and test methods for surge protective devices for low voltage power supply systems.
The purpose of this study is to establish the characteristics of protectors suitable for protection against indirect and direct effects of lightning or other transient overvoltage surges.
properties, standard test methods and rated values, etc.
--- Low voltage surge protective devices (SPD) Part 12: Guidelines for the selection and use of surge protective devices for low voltage distribution systems.
It is suitable for connecting to AC 50Hz~60Hz, voltage not exceeding 1000V or DC voltage not exceeding 1500V.
Selection, operation, installation location and coordination principle of SPD.
--- Low voltage surge protective devices Part 21: Surge protective devices (SPD) for telecommunication and signalling networks Performance requirements and test methods.
The purpose is to establish appropriate protection measures for telecommunication and signalling networks directly or indirectly affected by lightning or other transient overvoltages.
Performance requirements and test methods for surge protectors.
--- Low voltage surge protective devices Part 22: Guidelines for the selection and use of surge protective devices for telecommunication and signalling networks.
It is suitable for surge protection in telecommunication and signal networks with a system nominal voltage not exceeding 1000V AC RMS and 1500V DC.
Guidelines for the selection, operation, installation and coordination of protective devices (SPDs).
--- Low voltage surge protective devices Part 31: Performance requirements and test methods for surge protective devices for photovoltaic systems. The purpose is to Establish the performance of surge protective devices suitable for protection against surges due to the indirect and direct effects of lightning or other transient overvoltages Requirements and test methods.
--- Low voltage surge protective devices Part 32: Guidelines for the selection and use of surge protective devices for photovoltaic systems. The purpose is to establish Applicable to connecting to AC side voltage RMS not exceeding 1000V (50Hz or 60Hz) and DC side voltage not exceeding Guidelines for selection, installation and coordination of SPDs for 1500V photovoltaic systems.
--- Low voltage surge protective devices (SPD) Part 41: Performance requirements and test methods for surge protective devices for DC low voltage power supply systems the purpose is to provide protection for surge protectors that protect against indirect and direct effects of lightning or other transient overvoltage surges.
Establish performance requirements and test methods.
--- Low voltage surge protective device components Part 311: Performance requirements and test circuits for gas discharge tubes (GDTs). The purpose is to determine Suitable for telecommunications, signal and low-voltage power distribution networks with a system nominal voltage not exceeding 1000V AC or 1500V DC Performance requirements and test circuits for gas discharge tubes used in, etc.
--- Low voltage surge protective device components Part 312: Guidelines for the selection and use of gas discharge tubes (GDTs). The purpose is to establish for telecommunications, signal and low-voltage power distribution networks with a system nominal voltage not exceeding 1000V AC or 1500V DC Guidelines for the selection and use of gas discharge tubes used.
--- Low voltage surge protective device components Part 321: Performance requirements and test circuits for avalanche breakdown diodes (ABD).
To establish performance requirements and test circuits for avalanche breakdown diodes suitable for use as surge protector components.
--- Low voltage surge protective device components Part 322: Guidelines for the selection and use of avalanche breakdown diodes (ABD).
Guidelines for the selection and use of avalanche breakdown diodes as surge protector components.
--- Low voltage surge protective device components Part 331: Performance requirements and test circuits for metal oxide varistors (MOVs).
The purpose is to establish the voltage for AC 1000V and below (50Hz or 60Hz, effective value) or DC 1500V and below.
Low voltage surge protective devices (SPDs) used to protect equipment and personnel from transient voltage hazards in power, communication and signal systems Performance requirements and test methods for metal oxide varistors (MOVs).
--- Low voltage surge protective device components Part 332: Guidelines for the selection and use of metal oxide varistors (MOVs).
To establish the power supply suitable for AC 1000V and below (50Hz or 60Hz, effective value) or DC 1500V and below, Metal oxides used in low voltage surge protectors (SPDs) for protecting equipment and personnel from transient voltage hazards in communication and signal systems Guidelines for the selection and use of metal oxide varistors (MOVs).
--- Low voltage surge protective device components Part 333: Life evaluation and U/I characteristics of metal oxide varistors (MOVs) the purpose is to establish a system for AC 1000V and below (50Hz or 60Hz, effective value) or DC 1500V and above Low voltage surge protector used to protect equipment and personnel from transient voltage hazards in power supply, communication and signal systems under Life evaluation and U/I characteristic equation of metal oxide varistors (MOVs) for SPD.
--- Low voltage surge protective device components Part 341: Performance requirements and test circuits for surge suppression thyristors (TSS).
To establish the characteristics of surge suppressors designed to limit overvoltage and shunt surge currents in a clamping and protective manner.
Ability to request and test loops.
--- Low voltage surge protective device components Part 351: Performance requirements and specifications for surge isolation transformers (SIT) for telecommunication and signalling networks the purpose of this test method is to establish a test circuit and test method suitable for determining and verifying the surge parameters of surge isolation transformers.
method.
--- Low voltage surge protective device components Part 352: Selection and use of surge isolation transformers (SIT) for telecommunication and signalling networks Guidelines. The purpose is to establish the selection, application principles and related information of surge isolation transformers suitable for telecommunications and signaling networks.
Low voltage surge protector components Part 331: Metal oxide varistors (MOV) performance requirements and test methods
1 Scope
This document specifies the power supply, communication and Metal oxide varistors for low voltage surge protectors (SPDs) used to protect equipment and personnel from transient voltages in signaling systems (MOV) performance requirements and test methods.
This document is applicable to single MOV and MOV with thermal protection measures (thermal protection varistor TPV), not applicable to the characteristics given in this document apply to MOVs installed in the test mode and are not applicable to MOVs installed in the test mode.
This document does not consider thermally protected varistors (TPVs) to be SPDs.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.
GB/T 2423.60 Environmental testing for electric and electronic products Part 2: Test methods Test U. Strength of lead terminals and integral mounting parts Degree (GB/T 2423.60-2008, IEC 60068-2-21:2006, IDT) IEC 60068-2-20 Environmental testing Part 2-20.Test methods Tests Ta and Tb. Resistance to soldering heat and solderability of equipment with conductors Note. GB/T 2423.28-2005 Environmental testing for electric and electronic products Part 2: Test methods Test T. Soldering (IEC 60068-2-20:1979, IDT)
3 Terms, definitions, symbols and abbreviations
3.1 Terms and Definitions
The following terms and definitions apply to this document.
3.1.1 General terms
3.1.1.1
Metal oxide varistor; MOV Mainly made of metal oxides, the conductivity increases rapidly and nonlinearly with the increase of applied voltage within a certain voltage and temperature range.
The resistance.
Note 1.In engineering applications, the equivalent resistance of a zinc oxide varistor (the difference between the peak voltage across the varistor and the peak current flowing through the varistor under impulse conditions) is the following mathematical expression can be used for regression analysis.
lgR=A0 A1·lgI A2·(lgI)2 where. R is the resistance value of the varistor; I is the current value flowing through the varistor; constant term A0, first term coefficient A1 and second term coefficient A2
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 45 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 2423.60Environmental testing - Part 2: Test methods - Test U: Robustness of terminations and integral mounting devices
- GB/T 2423.60-2008Environmental testing - Part 2: Test methods - Test U: Robustness of terminations and integral mounting devices
- GB/T 2423.28-2005Environmental testing for electric and electronic products - Part 2: Test methods - Test T: Soldering
IEC 60068
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Related Standards
GB/T 2423.28-2005 — Environmental testing for electric and electronic products - Part 2: Test methods - Test T: Soldering
GB/T 2423.60-2008 — Environmental testing - Part 2: Test methods - Test U: Robustness of terminations and integral mounting devices
GB/T 18802.11-2020 — Low-voltage surge protective devices (SPD) - Part 11: Surge protective devices connected to low-voltage power systems - Requirements and test methods
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