HG/T 2868-1997 Rubber diaphragm for transformer HG/T2868-1997 Standard download decompression password: www.bzxz.net

HG/T2868--1997
This standard is formulated based on the actual production of manufacturers over the years and the actual needs of the user units. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry. This standard is under the jurisdiction of the National Rubber and Rubber Products Standardization Technical Committee Coated Fabrics and Products Sub-Technical Committee. This standard is drafted by the Shenyang Rubber Industrial Products Research Institute of the Ministry of Chemical Industry, and the Northwest Rubber General Factory participated in the drafting. The main drafters of this standard are Cheng Hongyu and Li Renrong. 1 Scope
Chemical Industry Standard of the People's Republic of China
Rubber diaphragm for transformer
Rubber diaphragm for transformerHG/T 2868-1997
This standard specifies the technical requirements, sampling and test methods and marking, packaging, transportation, storage, etc. of rubber diaphragms for transformers (referred to as diaphragms - hereinafter referred to as diaphragms).
This standard applies to all kinds of transformer diaphragms made of rubber-coated fabric with working temperature of
40℃~-90'℃. 2 Reference 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, and the parties using this standard should explore the possibility of using the latest versions of the following standards. G3/T528—1992 Determination of tensile properties of vulcanized rubber and thermoplastic rubber GB/T5311992 Test method for Shore A hardness of vulcanized rubber (neqlISO7619:1986) GB/T1682—1994 Determination of low temperature brittleness of vulcanized rubber Single specimen method GB/T16901992 Test method for liquid resistance of vulcanized rubber (1eqIS01817:1985) GB/T3512—1989 Test method for hot air aging of rubber (negIS0188:1976) GB/T 7538—1987 Determination of the properties of rubber-coated fabrics as a whole roll (eqV[ISO2286:1972) GB/T 10720--1989 Determination of adhesion of coating layer of rubber or plastic coated fabrics (egVIS02411:1973) HG/T 2580-1994
Determination of tensile strength and elongation at break of rubber or rubber coated fabrics (eg VISO1421:1977) 3 Structure and classification
3.1 Structure
The structure of the diaphragm shall comply with the requirements of the drawings provided by the user. 3.2 Classification
The diaphragm is divided into the following three types:
Type A: Oil pillow diaphragm for transformers;
B: Diaphragm for T. Sensors
Type C: Diaphragm for oil level gauges.
4 Requirements
4.1 Materials
4. 1. 1 The properties of the rubber compound used to make the diaphragm are given in Table 1. Approved by the Ministry of Chemical Industry of the People's Republic of China on April 21, 1997, and implemented on October 1, 1997
Hot tensile strength/MPa
Elongation at break/%
Yuer A hardness/degree
Month name
Transformer oil, 70Y:×48 h, volume change rate/%Brittle temperature/C
Transformer oil.100℃X24h
Change rate of tensile strength/%
Change rate of elongation at break/%
Hot air aging, 1G0C:×72 h
Change rate of tensile strength/%
Change rate of elongation at break/%
HG/T 2868: 1997
Properties of rubber
Not less than
Not less than
Not higher than
Not lower than
Not less than
4.1.2 The properties of the main coated fabric used to manufacture diaphragms are given in Table 2: Table 2 Properties of coated fabrics
Original thickness/
Tensile strength/(kN/m)
Adhesion strength/(kN/m)
Not greater than
Not less than
Not smaller than
4.1.3 The rubber molded parts used to manufacture diaphragms shall comply with the relevant provisions of the drawings. 4.2 Dimensions
The diaphragm dimensions shall comply with the drawing requirements provided by the user. 4.3 Appearance
Performance requirements
Performance requirements
4.3.1 The outer surface of the diaphragm should be kept clean, and no defects such as pinholes, fabric breaks, exposed fabric, bubbles, debonding, delamination, rough edges, dead folds, etc. are allowed. 4.3.2 The overlap width of the diaphragm shall not be less than 15 mm. 4.3.3 Defects that do not meet the above requirements are allowed to be repaired, among which: Type A diaphragms are allowed to be repaired once per square meter of the outer surface; Type B diaphragms are allowed to be repaired once. The area of ​​each repair scar shall not exceed 50 cm\. Type C diaphragms are not allowed to be repaired fraudulently. 4.4 Air tightness
Under normal circumstances, the diaphragm is filled with air at a pressure of 2.0 kPa and left for 30 minutes. There should be no leakage. 5 Sampling and test methods
5.1 Sampling Www.bzxZ.net
5.1.1 The rubber materials used to manufacture the diaphragm are grouped into five batches. Each batch is tested in accordance with the provisions of 4.1.1. The 100C transformer oil test and the hot air aging test are sampled once each. If any item in the test fails, double samples should be taken to repeat the test. If it still fails, the batch of rubber materials is allowed to be changed to full test roll by roll, and the unqualified ones are discarded. 5.1.2 The rubber coated fabric for the diaphragm is grouped into 500m of continuous production. Each batch is tested in accordance with the provisions of 4.1.2. If any item of the test result fails, double samples should be taken from the roll to repeat the test. If it still fails, the material is taken roll by roll for testing, and the unqualified ones are discarded.
5.2 Test methods
5.2.1 Performance test of rubber compound for manufacturing diaphragm
5.2.1.1 Holding strength and tearing elongation according to 528 ranking 5. 2. 1.2 Hardness: According to GB/T 531, HG/T 2868---1997
5.2.1.3 Transformer oil resistance test. According to CB/T1690 5.2.1.4 Brittle temperature test. According to GB/T 1682. 5.2.1.51) 0℃C transformer oil aging test. According to GB/T3512. 5.2.1.6 Hot air aging test. According to CB/T3512. 5.2.2 Performance test of rubber coating for manufacturing diaphragm 5.2.2.1 Thickness. According to GB/T7538 escape. 5.2.2.2 Tensile strength shall be tested in accordance with HG/T2580. 5.2.2.3 Adhesion strength shall be tested in accordance with GB/T10720. 5-2.3 Diaphragm performance test
5.2.3.1 Visual inspection of appearance and measurement of dimensions with a steel ruler. 5.2.3.2 Air tightness shall be tested in the following manner!
In a humid and unconstrained environment, slowly fill the diaphragm with compressed air, leave it for 30 minutes, stabilize the pressure to 2.0 kPa, apply 1.5% soapy water on its outer surface and observe whether bubbles are generated.
6 Marking, packaging, transportation, storage
6-1 Marking
Each diaphragm should have obvious and durable markings on its outer surface at the position specified in the drawing. The markings include: a) manufacturer code or name;
b) product name and label number;
c) product model and specification;
d) manufacturing date.
6.2 Packaging and transportation
The diaphragm should be folded and packed in a plastic bag or carton. The packaging should be firm and reliable to ensure the safety of the product during handling and transportation. The packer should indicate the product name, specification, quantity, packaging date, manufacturer name, factory address, etc. The product qualification certificate should be attached to the package, and the certificate of conformity should be stamped with the seal of the quality supervision department. 6.3 Storage
The diaphragm should be stored in a warehouse with a temperature of -5-~35 and a relative humidity of no more than 80%. It should be kept away from direct sunlight and avoid contact with substances that affect product quality, such as acids, acids, oils and organic solvents. It should be kept at a distance of 1 meter from heat sources and prevented from mechanical damage.
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