This standard specifies the type and size, technical requirements, test methods, inspection rules, marking and packaging of porcelain sleeves for electrostatic precipitators. This standard applies to DC rated voltages of 72, 80, 90, 100 kV, operating temperatures of 150, 200, 250 °C, and installation locations with an altitude of no more than 1000 m. This standard does not apply to insulators used in working environments that are sufficient to reduce the performance of the porcelain sleeves and cause condensation on the surface of the porcelain sleeves. JB/T 6746.1-1993 Porcelain insulators for electrostatic precipitators Porcelain sleeves JB/T6746.1-1993 Standard download decompression password: www.bzxz.net

Subject content and scope of application
Machinery Industry Standard of the People's Republic of China
Porcelain insulators for electrostatic precipitators:
JB/T 6746.193
This standard specifies the type and size, technical requirements, test methods, inspection rules, marking and packaging of porcelain bushings for electrostatic precipitators (hereinafter referred to as porcelain bushings).
This standard applies to insulators with a DC rated voltage of 72, 80, 90, and 100 kV, a working temperature of 150, 200, and 250°C, and an installation location with an altitude not exceeding 1000m.
This standard does not apply to insulators used in working environments that are sufficient to reduce the performance of the porcelain bushing and cause condensation on the surface of the porcelain bushing. 2 Reference standards
Technical conditions for high-voltage insulator porcelain parts
GB775.1~775.3 Test methods for insulators GB2900.8 Electrician's nomenclature insulators
JB/T94
3 Terminology
Insulator product packaging
The terms used in this standard conform to the provisions of GB2900.8 4 Types and dimensions
4.1 The porcelain sleeve shall be manufactured according to the drawings approved by the prescribed procedures, and its form and main dimensions shall conform to the provisions of Figure 1, Figure 2 and Table 1. Figure 1 Cylindrical porcelain bushing
Approved by the Ministry of Machinery Industry on 1993-08-21
Figure 2 Conical porcelain bushing
Implemented on 1993-10-01
JH07201A
JH-07202A
JH-07251A
JH-07252AwwW.bzxz.Net
JH-07253
JH-0S001B
JH-08051B
JH-08052B
JH-08 053B
JH-09001C
JH-09051C
JH-10051C
JH-10052C
The model of the porcelain bushing is as follows:
5 Technical requirements
JB/T6746.1—93
Main dimensions of the porcelain bushing
Working temperature: divided into three types: A, B, and C, representing 150℃, 200℃, and 250℃ respectively
Product design serial number: 01 is cylindrical; 51 is conical. DC rated voltage: kv
·Porcelain bushing for electrostatic precipitator
5.1 The porcelain bushing should be made of heat-resistant porcelain material, and its appearance quality should meet the corresponding provisions of GB772. 5.2 The cross section of the porcelain sleeve should be homogeneous and dense, and there should be no penetration after the porosity test. The pressure during the porosity test is not less than 20MPa, and the product of pressure and time is not less than 180MPa·h. 5.3 The maximum allowable value of the surface roughness parameter Ra of the upper and lower end surfaces of the porcelain sleeve is 12.5μm. 5.4
The dimensional tolerance of the porcelain sleeve shall meet the following requirements: a
The axial direction shall not exceed 1%Hmm;
The radial direction shall not exceed 2.2%D
The wall thickness shall not exceed 10%8
The shape and position tolerance of the porcelain sleeve shall meet the following requirements: 8.
The flatness of the upper and lower end faces shall not exceed 0.5mm;
The parallelism of the upper and lower end faces shall not exceed 0.52%D
The roundness of the upper and lower ends shall not exceed 2%D
When H≤500mm, the coaxiality of the upper and lower end faces shall not exceed 5mm; when H>500mm, the coaxiality of the upper and lower end faces shall not exceed 0.9%Hmm.
JB/T 6746.193
5.6The electrical performance of the porcelain sleeve shall meet the following requirements. When the power frequency AC voltage is used instead of the DC voltage test, the qualified range of the power frequency voltage value is the DC voltage divided by √2.
5.6.1 The wall thickness breakdown voltage shall not be lower than the corresponding provisions of GB772. 5.6.2 The porcelain wall shall withstand a 5-minute power frequency voltage test without breakdown, damage or abnormal heating. Its voltage value shall comply with the corresponding provisions of GB772.
5.6.3 It shall withstand room temperature and high temperature DC withstand voltage tests without breakdown, damage or flashover. The temperature and DC voltage values ​​during the test shall comply with the provisions of Table 2. When the power frequency AC voltage is used instead of the DC voltage test, the qualified range of its power frequency voltage value is the DC voltage value divided by √2. Table 2 Room temperature and high temperature DC withstand voltage
Rated DC voltage
DC test voltage
200℃
5.7 The porcelain sleeve shall withstand three rapid temperature changes without damage, and its test temperature shall comply with the corresponding provisions of GB772. 5.8 The compression failure load of the porcelain sleeve at room temperature shall not be less than 500kN. kv
5.9 Within two years from the date of delivery, if the user finds that the porcelain sleeve does not meet the requirements of this standard under the conditions of transportation, storage, installation and operation approved in accordance with the prescribed procedures, the manufacturer must replace it free of charge. 6 Test methods
Except for the test methods specified in this standard, the rest shall be carried out in accordance with the corresponding provisions of GB775.1~775.3. 6.1 Room temperature and high temperature DC withstand voltage test The clean and dry test sample is installed in a closed device, and the distance between the test sample and the high-voltage electrode and the inner wall of the device is not less than one time of the dry flashover distance of the test sample. During the test, the test sample is in a vertical state, and the voltage is applied between the two electrodes of the test sample; when testing at room temperature, the test sample should be in thermal equilibrium with the ambient temperature; when testing at high temperature, the test sample should not be heated by local heating such as direct baking or baking, and the heating rate shall not exceed 100℃/h.
When the temperature of each part of the device reaches the specified working temperature and stabilizes, apply voltage to the specified value and maintain for 1 minute. If the test piece does not break down, be damaged or flash over, the test is passed.
6.2 Compression failure test
Place the test piece on the test device at room temperature, add soft pads at both ends, and apply pressure until it is destroyed according to the provisions of GB775.3. The load at this time is the compression failure load.
7 Inspection rules
The porcelain bushing shall be inspected by the factory quality inspection department. The manufacturer shall ensure that all porcelain bushings delivered meet the requirements of this standard. 7.1
7.2 According to the inspection rules specified in this standard, the user has the right to inspect whether the quality and indicators of the porcelain bushing meet the requirements of this standard. 7.3 The porcelain bushing shall be inspected in batches. Porcelain bushings of the same model manufactured by the same process method are a batch, and the number of each batch shall not exceed 100. 7.4 The inspection of porcelain bushings is divided into individual tests, sampling tests and type tests. 7.4.1 Test one by one
Test one by one in accordance with the provisions of Table 3. If any of the requirements specified in Table 3 are not met, the porcelain bushing is unqualified. 9
Test item name
Appearance inspection
Dimension inspection
Ceramic wall power frequency withstand voltage test
Sampling test
JB/T 6746. 193
Table 3 Test items one by one
Test basis
Article 5.1 of this standard
Article 4.1 of this standard
Article 5.6.2 of this standard
Test method
Sampling test After all the tests are qualified, randomly select 2 pieces and conduct the test in accordance with the provisions of Table 4. During the test, if two samples do not meet any of the requirements specified in Table 4, the batch of products shall be unqualified; if one product fails in any item, twice the number of samples shall be sampled from the same batch of products for repeated testing. If there is still one sample that does not meet any of the requirements in Table 4, the batch of porcelain bushings shall be unqualified; but if only the size inspection fails, only the size shall be doubled; if there is any failure, the manufacturer is allowed to select each one. Table 4 Sampling test items
Test item name
Dimension and geometric tolerance inspection
Temperature cycle test
Acid test of hole
Form test
Test basis
Articles 4.1, 5.4, 5.5 of this standard
Article 5.7 of this standard
Article 5.2 items
Test quantity (pieces)
All after item 1
Porcelain blocks after item 2
Test method
When new products are trial-formed or the structure of normal products is modified, the raw material formula and process methods are changed, a type test must be carried out. The number of samples for the type test shall not be less than 4, and after each test is qualified, it shall be carried out according to Table 5. During the type test, even if one sample does not meet any of the requirements specified in Table 5, the type test is unqualified. Table 5 Formal test items
Appearance inspection
Test item name
Dimension and geometric tolerance inspection
Temperature cycle test
Compression failure test
Ceramic wall withstand voltage test
Room temperature and high temperature DC withstand voltage test
Wall thickness breakdown voltage test
Porosity test
Marking and packaging
Test basis
Article 5.1 of this standard
Articles 4.1, 5.4 and 5.5 of this standard
Article 5.7 of this standard||t t||Article 5.8 of this standard
Article 5.6.2 of this standard
Article 5.6.3 of this standard
Article 5.6.1 of this standard
Article 5.2 of this standard
Test quantity (pieces)
All after item 1
Ceramic blocks after item 3
Each ceramic block after items 4, 5 and 6
Test method
Article 6.1 of this standard
Ceramic bushings should be packed in wooden boxes and ensure that they will not be damaged due to poor packing during transportation. The packaging shall refer to the relevant provisions of JB/Z94. The packaging box should indicate:
Manufacturer name;
Porcelain bushing model;
Number of porcelain bushings;
Total weight of packaging box;
"Handle with care", "Porcelain parts" and other words or indication marks. The porcelain bushing should have a clear and firm manufacturer's trademark and manufacturing year. 8.3
JB/T6746.1—93
Each batch of porcelain bushings delivered should be accompanied by a product certificate, which should have the seal of the manufacturer's quality inspection department. Additional notes:
This standard was proposed by the National Technical Committee for Standardization of Insulators. It is under the jurisdiction of Xi'an Electric Porcelain Research Institute, which is entrusted with the interpretation.
This standard was mainly drafted by Jiujiang Electric Porcelain Factory. This standard was mainly participated in by Tongchuan Electric Porcelain Motor Factory. This standard was mainly drafted by Shu Guodong and Liu Jisheng. This standard was mainly participated in by Li Musen and Zhao Jincai.
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