GB/T 1408.1-2016 PDF English (GB/T 1408.1-2006: Older version)

GB/T1408.1-2016 (GBT1408.1-2016): PDF in English

GB/T 1408.1-2016 Insulating materials--Test methods for electric strength--Part 1. Test at power frequencies ICS 29.035.99 K15 National Standards of People's Republic of China Replace GB/T 1408.1-2006 Insulation material electrical strength test method Part 1. Test under power frequency Released on December 13,.2016 2017-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued Content Foreword I 1 range 1 2 Normative references 1 3 Terms and Definitions 2 4 Test significance 2 5 electrodes and sample 3 6 Conditional treatment before test 6 7 surrounding medium 7 8 Electrical equipment 7 9 Test procedure 8 10 boost mode 8 11 breakdown judgment 10 12 trials 10 13 Test report 10 Appendix A (informative) Test data and processing 18 Reference 19 Foreword GB/T 1408 "Insulation Material Electrical Strength Test Method" is divided into the following three parts. --- Part 1. Test under power frequency; --- Part 2. Additional requirements for the application of DC voltage tests; --- Part 3. 1.2/50μs impact test supplementary requirements. This part is the first part of GB/T 1408. This part replaces GB/T 1408.1-2006 "Insulation material electrical strength test method Part 1. Test under power frequency". versus The main technical changes compared with GB/T 1408.1-2006 are as follows. ---Modified "normative references" (see Chapter 2, Chapter 2 of the.2006 edition); --- Increased the test requirements for "ball plate electrodes" (see 5.2.1.3); --- Increased the test requirements for "elastomers" (see 5.2.6.2.4); --- Added "test in solid materials" (see 7.4); --- Added schematic diagram of "ball plate electrode" [see Figure 1c)]; --- Removed Appendix B (see Appendix B of the.2006 edition). This part uses the translation method equivalent to IEC 60243-1.2013 "Insulation material electrical strength test method Part 1. Power frequency Test" (3rd edition). The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. Paints for electrical insulation - Part 2. Test methods (IEC 60464-2.2001, MOD) ---GB 2536-2011 Unused mineral insulating oil for electrical liquid transformers and switches (IEC 60296.2003, MOD) ---GB/T 5471-2008 Compression molding of plastic thermosetting plastic samples (ISO 295.2004, IDT) Insulated hoses - Part 2. Test methods (IEC 60684-2.2003, MOD) ---GB/T 9352-2008 Compression molding of plastic thermoplastic materials (ISO 293.2004, IDT) ---GB/T 10580-2015 Standard conditions for the use of solid insulating materials before and during testing (IEC 60212.2010, IDT) GB -T 15022.2-2007 Resin-based reactive composites for electrical insulation - Part 2. Test methods (IEC 60455-2. 1998, MOD) Plastics -- Thermoplastics -- Preparation of injection mouldings - Part 3 . slabs ( ISO ) 294-3.2002, IDT) ---GB/T 21218-2007 Unused silicon insulating liquid for electrical (IEC 60836.2005, IDT) This part was proposed by China Electrical Equipment Industry Association. This part is under the jurisdiction of the National Technical Committee for Standardization of Electrical Insulation Materials and Insulation Systems (SAC/TC301). This section drafted by. Suzhou Taihu Electric New Materials Co., Ltd., Yantai Minstar Special Paper Co., Ltd., mechanics Beijing Institute of Electrical and Mechanical Technology, Shanghai Cable Research Institute, Zhuzhou Times Electric Insulation Co., Ltd., Guilin Electric Apparatus Research Institute Limited. The main drafters of this section. Chen Yu, Zhang Chunqi, Guo Zhenyan, Wang Dianxin, Xu Xiaofeng, Xia Junfeng, Liu Yali, Zeng Zhi, Zhang Junhua, Wang Yizhen, Wu Bin, Wang Xianfeng. The previous versions of the standards replaced by this section are. ---GB/T 1408-1978, GB/T 1408-1989, GB/T 1408.1-1999, GB/T 1408.1-2006. Insulation material electrical strength test method Part 1. Test under power frequency 1 Scope This part of GB/T 1408 proposes a test method for determining the short-term electrical strength of a solid insulation material at a power frequency (ie 48 Hz to 62 Hz). This section specifies the impregnating agent or surrounding medium when testing liquids and gases as solid insulating materials, but not for liquids and gases. Body test. Note. This section includes methods for determining the breakdown voltage of a solid insulating material. 2 Normative references The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. ISO 293 plastic thermoplastic compression molded specimen (Plastics-Compressionmouldingoftestspecimensof Catalyst materials) Plastics -- Thermoplastic injection mouldings - Part 1 . General principles and versatile mouldings and strips (Plas- tics-Injectionmouldingoftestspecimensofthermoplasticmaterials-Part 1.Generalprinciples,and Mouldingofmultipurposeandbartestspecimens) ISO 294-3 Plastics -- Thermoplastic injection molded specimens - Part 3. Plastics-Injectionmouldingof testspecimensofthermoplasticmaterials-Part 3.Smalplates) ISO 295 plastic thermoset compression molded specimen (Plastics-Compressionmouldingoftestspecimensof Thermosettingmaterials) ISO 10724 (all parts) Plastic thermosetting powder molding composite injection molded specimens (Plastics-Injectionmoulding Oftestspecimensofthermosettingpowdermouldingcompounds) Standard conditions for the use of IEC 60212 solid electrical insulating materials during testing and before testing (Standardconditionsforuseprior Toandduringthetestingofsolidelectricalinsulatingmaterials) IEC 60296 Unused mineral insulating oil for liquid transformers and switchgear used in electrical engineering (Fluidsforelectrotech- nicalapplications-Unusedmineralinsulatingoilsfortransformersandswitchgear) Specification for solvent-free polymerizable resin compounds for electrical insulation - Part 2. Test method (Specification for solvent-lesspolymerizableresinouscompoundsusedforelectricalinsulation-Part 2.Methodsoftest) Paints for electrical insulation - Part 2. Test methods (Varnishesusedforelectricalinsulation-Part 2. Methodsoftest) IEC 60684-2 insulating flexible bushings - Part 2. Test methods (Flexibleinsulatingsleeving-Part 2.Methods Oftest) IEC 60836 Specification for unused silicon-insulated liquids for electrical equipment (Specificationsforunusedsiliconeinsulating Liquidsforelectrotechnicalpurposes) IEC 61099 Insulating Liquids for Electrically Unused Synthetic Organic Ester Specifications (Insulatingliquids-Specificationsfor Unusedsyntheticorganicestersforelectricalpurposes) 3 Terms and definitions The following terms and definitions apply to this document. 3.1 Electrical breakdown electricalbreakdown When the sample is subjected to electrical stress, its insulation performance is seriously lost, thereby causing the test loop current to promote the corresponding circuit breaker. action. Note. Breakdown is usually caused by partial discharge in the gas or liquid medium around the sample and the electrode, and makes the small electrode (or two electrodes if the two electrodes are straight If the diameter is the same, the sample at the edge is destroyed. 3.2 Flashover flashover Under the action of electrical stress, the insulation properties of the gas or liquid medium around the sample and the electrode are lost, and the resulting test loop current is promoted. Responsive loop breaker action. Note. A carbonization channel or a perforation in the sample indicates a breakdown, otherwise it is a flashover. 3.3 Breakdown voltage breakdownvoltage 3.3.1 (In the continuous boost test) The voltage at which the sample breaks under the specified test conditions. 3.3.2 (In the step-up test) the highest voltage that the sample withstands, at which the sample does not break down throughout the time. 3.4 Electrical strength electircstrength The quotient of the distance between the breakdown voltage and the two electrodes applying the voltage under the specified test conditions. Note. Unless otherwise specified, it is recommended to determine the distance between the two test electrodes as specified in 5.5. 4 Test significance The electrical strength test results obtained in this section can be used to detect changes in process, aging conditions or other manufacturing or environmental conditions. The resulting performance changes or deviations from normal values are generally not recommended for direct determination of the performance of insulating materials in practical applications. status. The electrical strength measurements of materials may be affected by a number of factors, including. a) Sample status. 1) the thickness and uniformity of the specimen and the presence of mechanical stress; 2) pretreatment of the sample, especially the drying and impregnation process; 3) Whether there is air gap, moisture or other impurities. b) Test conditions. 1) the frequency, waveform and boosting speed or pressurization time of the applied voltage; 2) ambient temperature, pressure and humidity; 3) electrode shape, electrode size and thermal conductivity; 4) Electrical and thermal properties of the surrounding medium. All of these influential factors should be considered when researching new materials that have no practical experience. This section specifies some specific Conditions to quickly identify materials and can be used for quality control and similar purposes. The results obtained by different methods are not directly comparable, but each result provides information on the electrical strength of the material. most The electrical strength of the material decreases as the thickness of the sample between the elec.......
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