HG/T 2812-1996 Cork and rubber sealing products. Part 1: For transformers and high voltage electrical appliances
Some standard content:
HG/T2812—1996
This standard is formulated based on the P2245A cork rubber material specification in the American Society for Testing and Materials standard ASTM F104-93 "Classification Method for Non-metallic Gasket Materials" and in combination with my country's actual situation. Under the general title of "Cork Rubber Sealing Products", it includes the following two parts: Part I (i.e. HG/T2812): For transformers and high-voltage electrical appliances; Part II (i.e. HG/T2813): For motor vehicles. This standard is an independent part under the general title "Cork Rubber Sealing Products". Appendix A, Appendix B and Appendix C of this standard are all standard appendices. Appendix A is equivalent to ASTM F36-92 "Standard Test Method for Compressibility and Recovery of Gasket Materials" Appendix B is equivalent to ASTM F147-87 (93) "Standard Test Method for Flexibility of Non-metallic Gasket Materials", and Appendix C is equivalent to ASTM D3455--89 "Test Method for Compatibility of Structural Materials and Electrical Insulation Sleeves", this standard was proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China, and 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 Shaanxi Qianxian Cork and Rubber Factory, and participated in by the Northwest Rubber Industry Products Research Institute of the Ministry of Chemical Industry, Kunshan Rainbow Composite Materials Co., Ltd., and Henan Neiduo Fengshen Rubber Soft Technology Co., Ltd. The main drafters of this standard are: Zhu Haifeng, Li Zongqi. Cao Yuanli, Zhu Zhenpeng, Chen Yu. 13
1 Scope
Chemical Industry Standard of the People's Republic of China
Cork and Rubber Sealing Products
Part 1: For Transformers and High-Voltage Apparatus HG/T 2812 — 1996bzxz.net
This standard specifies the requirements, sampling, test methods, marking, labeling, packaging, transportation and storage of cork and rubber sealing products for oil-filled transformers and high-voltage electrical apparatuses.
This standard is applicable to cork and rubber sealing products for oil-filled transformers and high-voltage electrical apparatuses and their supporting components. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard was published, the versions shown were all valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T 264-B3 Determination of acid value of petroleum products GB/T 528-92 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T 531-92 Test method for part A hardness of vulcanized rubber (ne9ISO7619:1986) GB/T 1682-82 (89) Test method for temperature resistance of alkalized rubber GB/T 1690-92 Test method for liquid resistance of chemically modified rubber (negISO1817:1985) GB/T 2536-90 Transformer oil
GB/T2828-87 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) GB/T3512-83 (89) Rubber hot air aging test method (neISO188:1976) GB/T5654-85 Liquid insulating material power frequency relative dielectric band number, dielectric loss factor and volume resistivity measurement GB/T5721-93 Rubber sealing product marking, packaging, transportation and storage general provisions GB/T6541-86 Petroleum products Determination of interfacial tension of oil to water (ring method) GB/T7759-B7 Determination of permanent deformation of vulcanized rubber at room temperature and high pressure compression set naq.ISO815:1972)
GB 9865—88
Preparation of vulcanized rubber samples and test specimens (ncIS04661/1:1986) 3 Requirements
3.1 Materials
Cork particles should be clean, free of impurities, soft and elastic. Rubber and its compounding ingredients should comply with the provisions of relevant national standards or industry standards.
3.2 Physical properties
Physical properties are shown in Table 1.
Ministry of Chemical Industry of the People's Republic of China Approved on June 28, 1996 Implementation on January 1, 1997
Compressibility, %
Recovery, min. %
Elongation, min., MPa
Flexibility index, F, max.
Hardness. Yaner A type
HG / T 2812 -- 1996
Table 1 Physical properties
Hot air aging, 100℃×10h, pick index F, max. Hot air compression set, compression 25%, 70℃×2h, max., % 25# transformer oil compression set, compression 25%, 100℃×168h, max., % 25# transformer oil resistance, 100℃×70h, volume change, % dielectric consumption rate (t) change, max. %
Compatibility with transformer oil
100±×164 h
Acid value, max. mKOH /
Interfacial tension. mN/㎡
Transistor temperature. Not higher than,
3.3 Product size and tolerance
3.3.1 Plate
3.3.1.1 The maximum width of the plate is 915 mm; the thickness is 1 m:m~ 25 mm: refers to
30 ± 5
.70±10
-5-~+10
The difference compared with blank oil is 0~2
3.3.1.2 The thickness tolerance of the plate is shown in Table 2. The thickness of the same rubber plate shall not exceed 0.25m, and the length and width tolerance of the plate shall be ±1%
Table 2 Thickness Tolerance of Products
3.3.2 Profile
Public
The size and tolerance of the profile shall be agreed upon by the supply and demand parties. 3.4 Appearance
HG / T 2812 1996
The product surface should be flat and clean, without impurities and defects harmful to product processing and performance. 4 Sampling
41 Batch
The rubber material is produced by the same shift and the same machine in a batch of no more than 300k, and the products are the same batch of rubber material, the same production process conditions, the same specification products, no more than 5000 pieces in a batch. 4.2 Product appearance inspection
The appearance of the product should be inspected piece by piece.
4.3 Product size inspection: According to the general inspection level II in GB/T2828: the acceptable quality level (AQL) is 4.0, random sampling inspection is carried out.
4. 4 Inspection types
4.4.1 Factory inspection: Each batch of rubber materials shall be subject to factory inspection in accordance with the requirements of items 1 to 4 in Table 1. 4.4.2 Type inspection: When any of the following circumstances occurs, type inspection shall be carried out for all the requirements specified in this standard.)
4. 5 Re-inspection
Trial production and identification of old and new products for transfer of production; When there are major changes in material structure and process after formal production, which may affect product performance: During normal production, inspection shall be carried out at least once every six months; When production is resumed after a product has been discontinued for three months; When there is a major difference between the factory inspection result and the last type inspection result; When the national quality supervision agency proposes a requirement for type inspection. 4.5.1 When the size of the product is unqualified, it is allowed to be repaired and inspected again. If it is still unqualified, the batch of products is judged as unqualified products; when the appearance quality of the product is unqualified, it is allowed to be repaired once and inspected again. If it is still unqualified, it is a unqualified product. 4. 5.2 When the physical property test of the product is unqualified, double-staggered samples should be taken to inspect the unqualified items. If there is still one unqualified item, it is a unqualified product.
4.6 Test Specimens
The specimens should be cut from the product. If it is not possible to make them directly from the product, they can also be cut from the same batch of rubber materials used to manufacture the product and the same vulcanization conditions as the product. 4. 7 Test conditions
4.7.1 Standard conditions: Unless otherwise specified, all tests should be carried out at a temperature of 23 ± 2 °C. 4.7.2 Sample conditioning: Unless otherwise specified, all samples should be conditioned at standard conditions for at least 46 hours before testing. 4.8 Inspection and rejection
4.1 The supplier shall complete the specified tests and provide the test results to the purchaser in accordance with the specified requirements. The purchaser has the right to conduct inspections when it deems it necessary to ensure that the products meet the requirements of this standard. 4.2 Any product that does not meet the requirements of this standard or the requirements agreed upon by the supplier and the purchaser may be rejected. If there is a dispute between the two parties, the arbitration unit shall make the final decision.
5 Test method
5. 1 Appearance of the product
Inspect visually.
5.2 Thickness of the product
Measure the product 10 times at different points with a thickness gauge or vernier caliper with a graduation value of 0.02 m, and take the arithmetic average as the measurement result.
5.3 Physical property test methods
HG/T 2812 —1996
5.3.1 Compressibility and recovery shall be tested in accordance with the provisions of Appendix A, 5.3.2 Tensile strength shall be tested in accordance with the provisions of GB/T528, using *I\ type specimens, 5.3.3 Flexibility shall be tested in accordance with the provisions of Appendix B, 5.3.43
Hardness shall be tested in accordance with the provisions of GB／T531, and the measured values of 10 points shall be taken for each specimen, and the arithmetic mean shall be taken as the measurement result.
5.3.5 Hot air aging shall be tested in accordance with the provisions of GB/T3512, 5.3.6 Hot air compression permanent deformation and immersion in 25 sections of transformer oil compression permanent deformation shall be tested in accordance with the provisions of GB/T7759, using B type specimens.
5.3.7 Resistance to 25# transformer oil: Test according to the provisions of GB/T1690. 5.3.8 Compatibility with transformer oil: Test according to the provisions of Appendix C. 5.3.9 Temperature: Test according to the provisions of GB/T1682. After impact, the specimen is bent 180” along the impact direction around a mandrel that is 5 times the thickness of the specimen. Use a 5x magnifying glass to observe whether there are any cracks or splits in the bonded part of the cork particles. 6 Marking, labeling, packaging, transportation, purchase and storage 6.1 Marking
6. 1. 1 Product labeling
Products are marked with oil-resistant, non-toxic red dye for the month. 6.1.2 Packaging labeling
6.1.2.1 Each package should have a label. If transparent or translucent materials are used for packaging, a separate card should be placed in the packaging bag so that the label can be identified from the outside of the package without damaging the seal of the package. The labeling content includes: product specification code;
Standard name or code:
Production date:
Product quantity:
e) Manufacturer inspection batch number and qualified mark; manufacturer name or code.
The labeling content should be clear, eye-catching, and not easy to wear. 6 .1.2.2 The external markings of the packaging box include name, specification, production date, manufacturer name, trademark and moisture-proof and fire-proof marks. 6.2 Labels
Each batch of products should be accompanied by a label indicating: technical standard number, product name (or code), batch number, quantity, production unit (or code), manufacturing date, and the inspection department's qualified seal. 6.3 Packaging
The products can be packed in wooden boxes, cartons, plastic woven boxes or according to user requirements. The packaging should be strong and moisture-proof, with appropriate filling. The total weight of each package should not exceed 25kg
6.4 Transportation and storage shall be in accordance with the provisions of GB/T5721. 18
Appendix A (Appendix to the standard)
A1 Apparatus
Test method for compressibility and recovery of cork glue sealing materials A1.1. The test apparatus shall consist of the following components: A 1.1.1 Adhesive base
Minimum diameter 31.7 mm, surface quenched and ground A1.1.2 Indenter
Steel cylinder with a diameter of 12.8 mm ± 0.025 mm, the surface of the cylinder end quenched and ground A1.1.3 Dial indicator
Dial indicator with a graduation value of 0.01 mm, used to indicate the thickness of the sample during the test. A 1.1. 4 Preload applying device
Includes the weight of the pressure head itself and the additional weight, and its value is 4.4±0.44N.A1.1.5 Total load applying device
This device can be a set of weights, a hydraulic cylinder, a cylinder, or any other device that can apply the load evenly and slowly. Its value is 351±3.51N, and the total load is 356±3.56N.A2 Test specimen
A2.1 Preparation of test specimen and environmental adjustment
A2.1.1 The test specimen shall be prepared in accordance with GB9865. A2.1.2 The surface of the test specimen shall comply with the provisions of 3.4. The test specimen shall be round or square, with a minimum area of 6.5cm and a thickness of 3.2mm±0.38mm. There shall be no interface or gap within the minimum test area of the test specimen. A2.1.3 Specimen Environmental Conditioning
2.1.3.1 Prior to testing, the specimen shall be conditioned at a temperature of 23 ± 2°C and a relative humidity of (50 ± 4)% for at least 46 h. A2.1.3.2 If the relative humidity of (50 ± 4)% cannot be maintained mechanically, a plate containing reagent grade magnesium nitrate (Mg(NO)·6H,O) hook and solution may be placed in the conditioning chamber to provide the required relative humidity. A2.2 The test temperature shall ensure that both the specimen and the instrument are at a temperature of 23 ± 2°C for the test. A3 Test Procedure
A3.1 Place the specimen in the center of the anvil and apply a preload and maintain for 15 min. Read the thickness of the specimen under the preload. Then, apply a balanced load to the indenter at a uniform speed to reach the total load within 10 min. During the operation of the indenter falling, the indenter surface and the anvil surface shall be kept parallel. The total load is maintained at 605, and the thickness of the sample is immediately read. Then the main load is removed, and the sample is allowed to recover 60 under the preload. The thickness of the sample after recovery is immediately read. A 3.2 Number of tests
The test should be carried out at least three times with different samples, and the results are taken as the arithmetic mean. A4 Calculation
A4.1 Compressibility and recovery are calculated as follows: c
Where: C--compressibility, %;
R--recovery, %;
P—thickness under preload, mm;
M—thickness under total load, mm;
N recovery thickness, mm.
A4.2 Accuracy
The allowable deviation of compressibility and recovery is ±10%Test report
The test report should include the following contents:
The number of this standard is adopted, i.e.: Appendix A of HG/T2812-1996;The mark and compound number of the tested material:
Nominal thickness of the specimen;
Number of tests;
Thickness of the specimen and test load:
The test results of each specimen and its arithmetic mean: Test date:
Tester.
Appendix B (Standard Appendix)
B1 Purpose
Compression flexure test method for cork rubber sealant This test method is used to measure the ability of cork rubber sealant to withstand operations. These operations are the same as those that the product undergoes before or during installation.
B2 Apparatus
82.1 Steel cutter with dimensions of 12.7mm×154.4mmB2.2 Circulating hot air oven, maintaining a temperature of 100±1℃, B2.3 Mandrel, a series of diameters of 5mm to 102mm, each diameter specification differing by 1mm, B3 Specimen
B3.1 Specimen prepared in accordance with GB9865.
B3.2 The surface of the sample shall comply with the provisions of 3.4. B3.3 The thickness of the sample shall be 2.0mm±0.2mm. B3.4 The sample shall be conditioned for at least 46 hours at a temperature of 23±2°C and a relative humidity of (50±4)%. B3.5 The test temperature shall be 23±2°C.
4 Test procedure
B4.1 Place the sample close to the mandrel and use your fingers to slowly and firmly turn the sample around the mandrel 180°. Then use a new sample or the unbent part of the previous test sample to repeat this winding test on a mandrel with a smaller diameter until the sample is damaged. The required time for twisting the sample is 5±1. The damage that occurs shall refer to any cracks, breaks, or surface separations that can be seen visually. B4.2 After aging for 70 hours in a circulating hot air oven at 100±2℃, take out the sample and cool it for 24 hours±1 hour at a temperature of 23±200 million and a relative humidity of (50±4)%. Then complete the test procedure of B4.1 for the aged sample. B5 Result
The minimum mandrel diameter at which the sample can be bent without any signs of damage is divided by the thickness of the sample, which is the test result of the flexibility index. B6 Test report
The test report shall include the following:
The number of this standard is adopted. That is, Appendix B of HG/T2812-1996; Description of the sample for finishing, including the sample name, source, manufacturer and thickness; Production date of the sample:
Flexibility index:
When testing on materials with effective physical effects, two results in the longitudinal and transverse directions shall be reported: Test date:
Tester.
Appendix C (Standard Appendix)
C1 Purpose
Test method for compatibility of cork rubber sealing materials with transformer oilC1.1 Changes in the electrical properties of transformer oil are an important basis for determining whether the oil is contaminated by the sample.C1.2 Changes in the physical and chemical properties of transformer oil, such as changes in color, surface tension, acidity, etc., reflect that the sample is dissolved by the oil or otherwise damaged.
C2 Filling quantity
C2.1 Oven: A circulating ventilation oven that can control the temperature at 100±1°C and a drying oven at 105±5°C. C2.2 Glass container: A glass container with a volume of 1L. C2.3 Test equipment: The device specified in the relevant test method. C3 Sample
C3.1 Determination of sample size: Test with a sample with a surface area of the sample and the volume of the oil of 65cm/800mL. C3.2 The sample should be dried in a drying oven at 105±5°C for 16h. C3.3 Take the sample out of the oven (it is strictly forbidden to hold it with fingers), and put it in a glass container with a volume of 1L containing 800mL of transformer oil, and then cover it. Note: Qualified transformer oil refers to an oil that meets the requirements of GB/T2536 and is a type of oil specified by the local regulations. C3.4 A glass container containing only blank oil should be prepared for each test. C3.5 Place the glass container containing transformer oil and soaked sample and the glass container containing only blank oil in a 100 ± 1 °C oven at the same time. Aging for 164 h,
C3.6 Take out the glass container from the oven and cool it to room temperature. C4 Procedure
C4.1 Use a clean chain to take out the sample from the oil. Test the soaked sample oil and blank oil according to the following method. C4.1.1 Surface tension is tested in accordance with the provisions of GB/T6541. C4.1.2 Acid value is tested in accordance with the provisions of GB/T264. C4.1.3 Dielectric loss factor is tested in accordance with the provisions of GB/T5654. C5 Results
C5.1 Evaluation of Results
C5.1.1 The test results of the oil after soaking the sample must be compared with the test results of the blank oil. C5.1.2 If there is no difference in the test results between the sample oil and the blank oil, it means that the sample oil is not affected by the material. C5.1.3 If there is a significant difference in the results between the sample oil and the blank oil, it means that there may be a compatibility problem, indicating that the soft rubber material needs further assessment or should be combined. C5.1.3.1 The allowable fluctuation in the test results between the blank oil and the sample oil should be determined by negotiation between the supplier and the buyer before the test. C5.1.3.2 If the performance of the blank oil after aging exceeds the specified range of C5.1.4, you may suspect that there is a problem with the oil itself based on one or more of the following reasons:
The oil is unqualified:
The oil is contaminated:
The aging temperature exceeds the specified limit.
C5.1.4 The properties of the blank oil after aging should be as follows: Surface tension: minimum, 38mN/m
Acid value: maximum, 0.03 mgKOH/g;
Dielectric loss rate: %, maximum, 1.1.
C5.2 Accuracy and deviation
Since this test method is only used as a screening method to evaluate compatibility, it does not involve the accuracy and deviation related to 23
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