Some standard content:
ICS83. 140,50
Registration No. 464—1997
Chemical Industry Standard of the People's Republic of China
HG/T 2887—1997
Rubber material used for transformers
Rubher material used for transformers1997-04-21 Issued
Ministry of Chemical Industry of the People's Republic of China
Implementation on October 1, 1997
HG / T 2887 —1997
This standard is formulated based on the production and use of rubber materials for transformers. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry. This standard was drafted by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, and the Shenyang Transformer Parts Factory Branch and Xiangfan Rubber Factory No. 2 participated in the drafting.Www.bzxZ.net
The main drafters of this standard are Huang Zuchang, Li Zongqi, Wei Benrong, Cao Yang, and Shuai Fanming. 1 Scope
Chemical Industry Standard of the People's Republic of China
Rubber material used for transformers
Rubber material used for tramsformcrHG/T 2887—1997
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of rubber materials used for transformers. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. All parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T264--83 Determination of acid value of petroleum products GB/T528-92 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T52991 Determination of tear strength of vulcanized rubber (trouser-shaped, rectangular and crescent-shaped test specimens) (cqVISO34:79) GB/T531-92 Test method for Kiel A hardness of vulcanized rubber (neqTSO7619:1986) GB/T 1682-82 (89)
GB/T 1690-92
GB/T2536-90
GB/T2828-87
Test method for brittle temperature of vulcanized rubber
Test method for liquid resistance of vulcanized rubber (negISO1817:85)Transformer oil
Batch inspection counting sampling procedure and sampling table applicable to the inspection of continuous batches)GB/T3512--83(89)
GB/T 5654-85
GB/ T 5721-93
Rubber hot air aging test method (negISO188:76)Liquid insulating material power frequency: measurement of relative dielectric constant, dielectric loss factor and volume resistivityGeneral provisions for marking, packaging, transportation and storage of rubber sealing productsGB／T6541-86Petroleum productsDetermination of interfacial tension of oil to water (ring method)GB/T 7529—87
General provisions for appearance quality of molded and extruded rubber products GB/T 7759--87
Determination of permanent deformation of vulcanized rubber under constant deformation compression at room temperature and high temperature (neISO815:2)
GB/T 7762—87 Ozone aging test for vulcanized rubber Static tensile test method (negISO1431/1:80) HG/T2812—1996 Cork and rubber sealing products Part 1: For transformers and high-voltage electrical appliances 3 Requirements
3.1 The raw materials and manufacturing process of rubber materials for transformers shall comply with the provisions of the relevant technical documents. 3.2 The physical properties requirements of the materials are shown in Table 1.
Ministry of Chemical Industry of the People's Republic of China 1007-04-71 Standard No.
Hardness. Shore A degrees
Tensile strength, MPa
Elongation at break, %
Shrinkage permanent deformation:
HG/ T 2887 —1997
Table 1 Physical properties of materials
125×24h, in air, %
125×168h, in 25# transformer oil, %Tear strength, kN/m
Resistant to 25# transformer oil, 125×24h
Volume change, %
Weight change, %
Hot air aging, 100℃×72h
Degree change, degrees
Tensile strength change rate. %
Change of elongation at break, %
Brittle temperature,
Compatibility with 25* transformer oil:
Change of dielectric loss rate (tg), %
Surface tension, Difference from blank test value, MN/mAcid value, mg KOH / g
Ozone aging, 50pphm, 40℃×72h, stretching 15% (static) 3.3 The dimensions and tolerances of the products shall conform to the user's drawings or contract requirements, not less than
not less than
not greater than
not greater than
not less than
not less than
not less than
not less than
not greater than
-5~+10
no cracks
3.4 The working surface of the product shall be flat and smooth, and no defects such as bubbles, impurities, pitting, cracks or cracks that affect practical performance are allowed. The appearance quality of the non-working surface shall conform to the relevant provisions of GB/T7529. 4 Sampling
The rubber compound is produced in the same shift and on the same machine in batches of no more than 300kg. The same specifications of products produced with the same batch of rubber compound and the same production process conditions are considered as a batch based on the daily output. 4.2 Product appearance inspection
The appearance of the products should be inspected piece by piece
4.3 Product size inspection
Sampling inspection shall be carried out according to the general inspection level II in GB/T2828 and the acceptable quality level (AQL) of 4.0. 4.4 Inspection types
4.4.1 Factory inspection. Each batch of materials shall be inspected according to the requirements of items 1 to 4 in Table 1. HG/T2887—1997
4.4.2 Type inspection, when one of the following situations occurs, all requirements specified in this standard shall be subject to type inspection, and trial type identification shall be conducted for new and old products when they are transferred to the factory for production; a)
After formal production, if there are major changes in materials and processes that may affect product performance; during normal production, inspections shall be conducted at least once every six months; when the product is resumed after three months of suspension; when there is a major difference between the factory inspection results and the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 4.5 Re-inspection
4.5.1 When the size of the product is unqualified, the batch of products shall be judged as unqualified products; when the appearance quality of the product is unqualified, the product shall be judged as unqualified.
4.5.2 When the physical property test of the material fails, double samples should be taken to test the unqualified items. If the test is still unqualified, the rubber material is allowed to be refined once. After the refinement, the gold item performance test should be carried out. If there is still one unqualified item, the batch of rubber materials is unqualified. 5 Test method
5.1 Appearance
The appearance of the product shall be inspected by visual method. 5.2 Dimensions
The dimensions of the product shall be inspected with a measuring tool with a graduation value of 0.02mm. 5.3 Physical properties
5.3.1 The test specimens shall be prepared from the product. If they cannot be prepared directly from the product, they can also be prepared from the same batch of rubber materials used to manufacture the product, using a film of appropriate thickness made under the same process conditions as the production product. 5.3.2 Hardness, test according to GB/T531. 5.3.3 Tensile strength and elongation at break, test according to GB/T528, using type 1 specimen. 5.3.4 Compression set, test according to GB/T7759, using type B specimen. 5.3.5 Tear strength, test according to GB/T529, using right-angle specimen. 5.3.6 Resistance to 25# transformer oil, test according to GB/1690. 5.3.7 Hot air aging, test according to GB/T3512. 5.3.8 Kneading resistance, test according to GB/T1682. 5.3.9 Compatibility with 25# transformer oil, test according to Appendix C of HG/T2812, where the dielectric consumption rate (tg§), surface tension and acid value, are tested according to GB/T5654, GB/T6541 and GB/T264 respectively. 5.3.10 True oxygen aging, test according to GB/T7762 6 Marking, packaging, transportation. Single storage
6.1 Unless otherwise specified, the marking, packaging, transportation and storage of materials shall be carried out according to GB/T5721 6.2 In the case of complying with the storage regulations of GB/T5721, the storage period of the product is two years. Products that exceed the storage period must be fully tested for performance and can only be used after passing the test. People's Republic of China
Chemical Industry Standard
Rubber Materials for Transformers
HG/T 2887 - 1997
Editor Chemical Industry Standard Editing and Publishing Group
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100011
Printing China Ministry of Chemical Industry Standardization Research Institute
Copyright reserved. No reproduction allowed
Format. 880×12301/16, number of characters on a sheet 7000 First edition in October 1997
First printing in November 1997
Printing Quantity 1 300
Industry Report 4.00
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