Some standard content:
Mechanical Industry Standard of the People's Republic of China
Insulation barrel for SN10 series circuit breakers
Subject content and scope of application
This standard specifies the technical requirements, inspection rules, test methods, etc. for insulation barrels for SN10 series circuit breakers. JB
This standard applies to insulation barrels for SN10 series circuit breakers made of alkali-free glass fiber cloth for electrical use impregnated with epoxy phenolic resin, which are heated, rolled, baked, cured, machined and surface treated. Cited standards
GB1305
GB1408
GB5132
GB10064
3 Product classification
Heating of AC high-voltage electrical appliances during long-term operationGeneral rules for inspection, marking, packaging, transportation and storage of electrical insulation thermosetting laminated materialsTest methods for power frequency electrical strength of solid insulating materialsTest methods for electrical insulation laminated tubes
Test methods for insulation resistance of solid insulating materialsThe products are divided into three categories according to their use, as shown in Table 1. Table 1
Product name
SN10-101 insulation tube
SN10-101 insulation tube
SN10-35 insulation tube
4 Technical requirements
For SN10-101 circuit breaker
For SN10-10I circuit breaker
For SN1G-10I circuit breaker
For SN1035 series circuit breaker
Long-term allowable working temperature
65~155
4.1 The surface of the insulation tube should be smooth, without delamination, cracks, wrinkles, scratches, bubbles and other undesirable phenomena. The outer surface should be coated with brown insulation paint (SN10-35 insulation tube is colored according to the contract), the color of the coating should be uniform, without mottled flow marks, and the coloring degree of each batch of products should be consistent. 4.2 The machined parts are not allowed to have slag, delamination, etc. (except for the 1/2 turn at the beginning and end of the thread), and the surface should be insulated. 4.3 The dimensions, tolerances and surface roughness should meet the requirements of the product drawings. The physical, mechanical and dielectric properties should meet the requirements of Table 2. 4.4
Ministry of Machinery Industry 1993-
Flexural strength
21 approved
Compressive strength (axial)
Shear strength
Water absorption
Insulation resistance
24h/23C evaporated water
Dissipation factor (50Hz)
JB6775-93
Continued Table 2
Vertical dielectric strength (wall thickness greater than 3 to 6mm) Withstand voltage along the layer (in transformer oil at a temperature of 90±2C, pressurized for 5min)
The thread of the insulating tube should be able to withstand the tensile force specified in Table 3, and displacement and obvious deformation are not allowed. Table 3
Product name
SN10-101 insulation cylinder
SN10-10I insulation cylinder
Insulation cylinder should not leak oil
Insulation cylinder should be able to withstand the working voltage specified in Table 4. 4.7
Product name
SN10-10I insulation cylinder
SN10-10I insulation cylinder
SN10-35 insulation cylinder
Rated voltage
Voltage holding time
≥1.0×10*
≥1.0×10m
Electrode distance H\
Note: 1) See Figure 1.
After the SN10-35 insulation cylinder is damp, its surface should be able to withstand 103kV power frequency voltage in normal air for 1min. 4.8
The heat generated by the insulating tube during long-term operation shall comply with the provisions of Table 2 of GB763. 4.9
The insulating tube shall meet the requirements of the breaking and closing performance of the SN10 series indoor high-voltage oil-free circuit breakers. 5 Test methods
The appearance and surface roughness shall be evaluated by observation with eyes and mouth. 5.1
5:2 The dimensions shall be checked with a caliper, depth gauge, height gauge and special tools. 5.3 The physical, mechanical and dielectric properties tests shall be carried out in accordance with relevant standards and regulations (the samples to be treated for the dielectric properties test shall be placed in an oven at a temperature of 105±2℃ for 1h)
5.3.1 The density inspection shall be carried out in accordance with Article 7 of GB5132. The compression strength inspection shall be carried out in accordance with Article 5 of GB5132. 5.3.2
The water absorption inspection shall be carried out in accordance with Article 6 of GB5132. 5.3.3
The inspection of loss factor shall be carried out in accordance with Article 9 of GB5132. 5.3.4
The inspection of vertical dielectric strength shall be carried out in accordance with Article 6.1.6 of GB1408. 5.3.5
5.3.5. The inspection of layer withstand voltage shall be carried out in accordance with Article 6.2.3 of GB1408. The inspection of insulation resistance shall be carried out in accordance with GB10064. 5.3.7
JB677593
5.3.8 The inspection of bending strength shall be carried out in accordance with Article 3 of Appendix A. 5.3.9 The inspection of shear strength shall be carried out in accordance with Article 4 of Appendix A. 5.4 The inspection of tensile test shall be carried out in accordance with Article 5 of Appendix A. 5.5 During the oil leakage test, clean the outer surface of the insulating cylinder, evenly apply a layer of white powder, fill the cylinder with transformer oil, and let it stand for 24 hours under normal conditions. The white powder shall not change color.
5.6 During the power frequency withstand voltage test, the voltage should be accurately and steadily increased to the specified value, and then maintained at this value for 5 minutes. The insulation should not have breakdown, flashover or obvious heating. The configuration of the test electrodes is shown in Figure 1, and the electrode distance H is as specified in Table 4. 2
One steel plate electrode:
2—Test sample:
3 Metal foil electrode
5.7 After the SN1035 insulation is treated for 168h/23℃/93%, the surface withstand voltage test is carried out according to the requirements of Article 4.8. During the test, the voltage should be steadily increased to 103kV and maintained for 1 minute. There should be no breakdown or flashover. The test electrodes should be configured according to Article 8.2.4 of GB5132, and the distance between the two electrodes is 400mm.
5.8 The heating test of the insulation cylinder during long-term operation and the test of the breaking and closing performance of the circuit breaker can be carried out together with the circuit breaker type test according to the circuit breaker regulations.
6. Inspection rules
6.1 The insulation cylinder should be type tested at least once every three months. 6.2, Insulation cylinder type test items:
Physical, mechanical and dielectric performance tests (Article 4.4); a.
Tensile test (Article 4.5);
Oil leakage test (Article 4.6)
d. Power frequency withstand voltage test (Articles 4.7 and 4.8). 6.3 The factory test items of the insulation cylinder are Articles 4.1, 4.2, 4.3, 4.5, 4.6 and 4.7 of this standard. Among them, Articles 4.1, 4.2, 4.3 and Article 4.7 for SN10-35 insulation tubes are item-by-item inspection items; Articles 4.5, 4.6 and Article 4.7 for SN10-10I and SN10-10 insulation tubes are random inspection items. The sampling number of random inspection items is 5/1000 of each batch (but not less than five pieces). If one item does not meet the technical requirements, the unqualified items should be double-checked. If the doubled inspection still does not meet the requirements, the batch of products is judged to be unqualified. 7 Marking, packaging, transportation and storage
Marking, packaging, transportation and storage shall be carried out in accordance with the relevant provisions of GB1305. A1 Processing conditions
JB6775-93
Appendix A
Bending strength, shear strength and tensile test (supplement)
The processing conditions during the test shall be carried out in accordance with the provisions of Chapter 2 of GB5132. A2 Test equipment
A general material testing machine with an indication error not exceeding 1% of the minimum load should be used, and the specimen failure load should be between 15% and 85% of the scale range of the testing machine.
A3 Bending strength
A3.1 This method is to apply a bending load to the specimen to cause it to fail and calculate its bending strength. A3.2 The specimen is the original diameter of the insulating cylinder, and the length is 15±0.2mm. Each group of specimens is five. A3.3 Place the specimen between the pressure plates of the testing machine as shown in Figure A1. Adjust the moving speed of the chuck of the testing machine so that the speed is not greater than 1.3mm/min when the testing machine is unloaded, and then carry out the test in this state. P
A3.4 Bending strength is expressed by the following formula:
Flexural strength, MPa;
P-full load, N;
LSpecimen length, mm
-Insulating cylinder outer diameter, mm;
-Insulating cylinder inner diameter, mm.
3p(D+d)
Ld(Dd)
A3.5The arithmetic mean is used as the test result. Take three significant figures, A4
Shear strength
A4.1. This method is to apply pressure to the sample to make the layers shear until they are destroyed, so as to calculate their shear strength. A4.2The shape and size of the sample are shown in Figure A2. Each group of samples consists of five. 1.3mm/min, then carry out the test under this state, note that in Figure A2, D,-D;=4mm
A4.4 Shear strength is expressed by the following formula:
- Shear strength, MPa;
Where: 0.-
Failure load, N;
d——(D,+D,)/2, mm,
B Shear surface width, mm
D,±0,2
D+D,=D,+D:
A4.5 Take the arithmetic mean as the test result and take three significant figures. A5, Tensile test
A5.1 This method is to apply tension to the entire insulation tube until it is destroyed to test the minimum tensile strength of the insulation tube. The tensile test is only used to record the failure load, not to calculate the tensile strength. , A5.2 Five specimens per group.
A5.3 When implementing the internal thread tension test, the sample is installed according to Figure A3, and when implementing the external thread tension test, the sample is installed according to Figure A4. Adjust the weighing speed of the test machine chuck so that when the test machine is unloaded, the speed is not more than 1.3mm/min, and then implement the test in this state. TextbzxZ.net
Upper chuck
One sample;
One spring;
Lower chuck:
Failure load
Upper chuck
Sample,
JB6775-93
A5.4 Take the arithmetic mean as the test result and take three significant figures. Additional remarks:
This standard is proposed by the National Technical Committee for Standardization of High Voltage Switchgear. This standard is under the jurisdiction of the Xi'an High Voltage Electric Appliance Research Institute of the Ministry of Machinery Industry. This standard is drafted by Changchun Switch Factory of Jilin Province. The main drafters of this standard are Li Furun and Sun Shijie. Lower chuck;
Failure load
This standard refers to the Soviet standard rOCT12496-88 "Electrical epoxy phenolic glass cloth tubes and pipes" and the American Society for Testing and Materials standard ASTMD709-1978 "Specifications for thermosetting laminated materials" in the G-10 grade rolled round tube standard.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.