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GB/T 4207-2022 English PDF (GBT4207-2022)

GB/T 4207-2022 English PDF (GBT4207-2022)

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GB/T 4207-2022: Method for the determination of the proof and the comparative tracking indices of solid insulating materials

GB/T 4207-2022
ICS 29.035.99
CCS K 15
GB/T 4207-2022 / IEC 60112:2020
Replacing GB/T 4207-2012
Method for the Determination of the Proof and the
Comparative Tracking Indices of Solid Insulating Materials
(IEC 60112:2020, IDT)
ISSUED ON: JULY 11, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 Principle ... 9
5 Test Specimen ... 10
6 Test Specimen Conditioning ... 11
6.1 Environmental conditioning ... 11
6.2 Test specimen surface state ... 11
7 Test Apparatus ... 11
7.1 Electrodes ... 11
7.2 Test circuit ... 12
7.3 Test solutions ... 12
7.4 Dropping device ... 13
7.5 Test specimen support platform ... 14
7.6 Electrode assembly installation ... 14
7.7 Conditioning chamber ... 14
8 Basic Test Procedure ... 14
8.1 General ... 14
8.2 Preparation ... 15
8.3 Test procedure ... 16
9 Determination of Erosion ... 16
10 Proof Tracking Index Test (PTI) ... 16
10.1 Procedure ... 16
10.2 Report ... 17
11 Determination of Comparative Tracking Index (CTI) ... 18
11.1 General ... 18
11.2 Screening test ... 18
11.3 Determination of the maximum 50 drop withstand voltage ... 19
11.4 Determination of the 100-drop point ... 20
11.5 Report ... 21
Annex A (Informative) List of Factors that should be Considered by Product Committees ... 25
Annex B (Informative) Solution B ... 26
Annex C (Informative) Electrode Material Selection ... 27
C.1 Platinum electrodes ... 27
C.2 Alternatives ... 27
Bibliography ... 28
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents. This Document replaced GB/T 4207-2012 Method for the Determination of the Proof and the Comparative Tracking Indices of Solid Insulating Materials. Compared with GB/T 4207-2012, the major technical changes of this Document are as follows besides the structural adjustment and editorial modifications:
a) Add "Description of influence of material composition and surface condition on measurement results" (see Clause 1 of this Edition);
b) Add normative reference of "ISO 4287" (see Clause 2 of this Edition); c) Delete the five normative references of "GB/T 17037.1-1997, GB/T 17037.3-2003, IEC 104, ISO 293:1986 and ISO 295:1991" (see Clause 2 of the 2012 Edition); d) Change the notes on the definition of the term "electrical tracking failure" (see 3.2 of this Edition; 3.2 of the 2012 Edition);
e) Change the notes on the definition of the term "comparative tracking index"; and add Notes 1 and 4 (see 3.5 of this Edition; 3.5 of the 2012 Edition);
f) Add the term and definition of "deionized water" (see 3.8 of this Edition); g) Change the content of the "principle" note (see Clause 4 of this Editon; Clause 4 of the 2012 Edition);
h) Change the documents that can be referred to for the sample processing technology in "Specimen"; and add the technical content of Notes 6 and 7 (see Clause 5 of this Edition; Clause 5 of the 2012 Edition);
i) Change the definition of ambient temperature in "Environmental Conditions", from "23°C±5 °C" to "(23±2) °C"; and add the requirement to start the test time (see 6.1 of this Edition; see 6.1 of the 2012 Edition);
j) Change the description of "Solution A"; delete the requirement for the conductivity of deionized water used to configure the solution; and add Note 2 (see 7.3 of this Edition; 7.3 of the 2012 Edition);
k) Change the description of "Solution B" to "See Annex B" (see 7.3 of this Edition; 7.3 of the 2012 Edition);
l) Add The composition and ratio requirements, resistivity requirements and surface tension requirements of Solution C (see 7.3 of this Edition; 7.3 of the 2012 Edition); m) Change the technical content of the "drip device"; add the requirement for the target time between drops; and add the content of "Note 2" (see 7.4 of this Edition; 7.4 of the 2012 Edition);
n) Add the technical content of "conditioning room" (see 7.7 of this Edition); o) Delete the "requirements for the specified number of specimens" (see 10.1 of the 2012 Edition);
p) Change the description of "report of electric tracking index test results" (see 10.2 of this Edition; 10.2 of the 2012 Edition);
q) Change the requirements of "Overview" to determine the comparative tracking index; and delete Notes 1 and 2 (see 11.1 of this Edition; 11.1 of the 2012 Edition); r) Add "screening test" (see 11.2 of this Edition);
s) Change the technical content of Note 1 in "Measurement of 100 drops of liquid" (see 11.4 of this Edition; 11.2 of the 2012 Edition);
t) Change the technical content of "Annex B"; change "Solution B" to recommended "Solution C"; delete the conductivity requirement of deionized water in the technical content of "Solution B"; add "Solution B can be used to replace Solution C to achieve compatibility of test results" (see Annex B of this Edition; 7.3 of the 2012 Edition); u) Change the content of "Selection of electrode material" (see Annex C of this Edition; Annex B of the 2012 Edition).
This Document equivalently adopts IEC 60112:2020 Method for the Determination of the Proof and the Comparative Tracking Indices of Solid Insulating Materials.
This Document made the minimum editorial modifications as follows:
--- Due to editorial errors in the original text, change "(23±5) ℃" in 6.1 to "(23±2) ℃". Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. This Document was proposed by China Electrical Equipment Industrial Association. This Document shall be under the jurisdiction of National Technical Committee on Evaluation and Qualification of Electrical Insulating Material and Systems of Standardization Administration of China (SAC/TC 301).
Drafting organizations of this Document: Sichuan EM Technology Co., Ltd.; Suzhou Taihu Electric Advanced Material Co., Ltd.; Jiangsu Yuming New Material Co., Ltd.; Zhejiang Rongtai Technology Enterprise Co., Ltd.; Shenzhen Woer Nuclear Material Co., Ltd.; DEC Method for the Determination of the Proof and the
Comparative Tracking Indices of Solid Insulating Materials
1 Scope
This Document specifies the method of test for the determination of the proof and comparative tracking indices of solid insulating materials on pieces taken from parts of equipment and on plaques of material using alternating voltage.
This document provides a procedure for the determination of erosion when required. NOTE 1: The proof tracking index is used as an acceptance criterion as well as a means for the quality control of materials and fabricated parts. The comparative tracking index is mainly used for the basic characterization and comparison of the properties of materials.
This test method evaluates the composition of the material as well as the surface of the material being evaluated. Both the composition and surface condition directly influence the results of the evaluation and are considered when using the results in material selection process. Test results are not directly suitable for the evaluation of safe creepage distances when designing electrical apparatus.
NOTE 2: This Document is in compliance with IEC 60664-1.
NOTE 3: This test discriminates between materials with relatively poor resistance to tracking, and those with moderate or good resistance, for use in equipment which can be used under moist conditions. More severe tests of longer duration are available for the assessment of performance of materials for outdoor use, utilizing higher voltages and larger test specimens (see the inclined plane test of IEC 60587). Other test methods such as the inclined method can rank materials in a different order from the drop test given in this document.
2 Normative References
The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document.
ISO 4287 Geometrical Product Specification (GPS) – Surface texture: profile method – 5 Test Specimen
Any approximately flat surface may be used, provided that the area is sufficient to ensure that during the test no liquid flows away from the test electrodes.
NOTE 1: In general, flat surfaces of not less than 20 mm × 20 mm are used to reduce the probability of electrolyte flows away from the test electrodes although smaller sizes can be used, subject to no electrolyte loss, e.g., ISO 3167, 15 mm × 15 mm multi-purpose test specimens. NOTE 2: In general, separate test specimens for each test are used. If several tests are to be made on the same test piece, testing points can be sufficiently far from each other so that splashes, fumes, or erosion, from the testing point will not contaminate or influence the other areas to be tested. The thickness of the test specimen shall be 3 mm or more. Individual pieces of material may be stacked to obtain the required thickness of at least 3 mm.
NOTE 3: The values of the CTI obtained on specimens with a thickness below 3 mm cannot be comparable with those obtained on thicker specimens because of greater heat transmission to the glass support through thinner test specimens. For this reason, stacked specimens are possible. Test specimens shall have uniformly smooth and untextured surfaces which are free from surface imperfections such as scratches, blemishes, impurities, etc., unless otherwise stated in the product standard. If this is impossible, the results shall be reported together with a statement describing the surface of the specimen because certain characteristics on the surface of the specimen could add to the dispersion of the results.
For tests on parts of products, where it is impossible to cut a suitable test specimen from a part of a product, specimens cut from moulded plaques of the same insulating material may be used. In these cases, care should be taken to ensure that both the part and the plaque are produced by the same fabrication process, resulting in the same surface texture, wherever possible. Where the details of the final fabrication process are unknown, methods given in ISO 293, ISO 294-1 and ISO 294-3 and ISO 295 may be appropriate.
NOTE 4: The use of different fabrication conditions/processes can lead to different levels of performance in the PTI and CTI test.
NOTE 5: Parts moulded using different flow directions can also exhibit different levels of performance in the PTI and CTI test.
In special cases, the test specimen may be ground to obtain a flat surface. In this case, the surface texture according ISO 4287 (e.g., Rz values) shall be reported (see 10.2 and 11.5). NOTE 6: Any grinding can damage the specimen. In this case, material surface made by grinding has higher or lower tracking value than the original surface.

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