GB 8287.1-1998 High voltage post porcelain insulators Part 1: Technical requirements
Some standard content:
GB8287.1—1998
This standard adopts IEC168:1994 "Tests for indoor and outdoor pillar porcelain or glass insulators with nominal voltage higher than 1000V" in a non-equivalent manner.
This revision introduces the provisions of electrical equivalence and mechanical equivalence in type test according to IEC168, and also introduces some other provisions of IEC168. "Rated voltage value of the product" is changed to "the maximum voltage value of the electrical equipment used". The number of type test samples is reduced compared with that specified in GB 8287.1--87, but more than that specified in IEC168. The size inspection (except height) is changed from one-by-one testing to sampling testing, and the requirements for the pollution level of the product's external insulation and the provisions of environmental conditions are added. Some new standards are cited. This standard replaces GB 8287.1-87 from the date of effectiveness. Appendix A of this standard is a suggestive appendix.
This standard was proposed by the Ministry of Machinery Industry.
This standard is under the jurisdiction of Liang'an Electric Ceramics Research Institute. Xi'an Electric Ceramics Research Institute is entrusted with the interpretation of this standard. The drafting unit of this standard: Xi'an Electric Ceramics Research Institute. The main drafters of this standard: Li Danan, Qiu Zhixian. 1 General provisions
1.1 Scope
National Standard of the People's Republic of China
High voltage post insulators of ceramic materialPart 1: Technical specificationsGB 8287. 1-1998
neqIEC168:1994
Agency GIB 8287. 1--87
This standard applies to indoor and outdoor post porcelain insulators of power equipment and devices1 operating in converter systems with a nominal voltage higher than 1 000 V and a frequency not exceeding 100 Hz.
The indoor post insulators in this standard are not applicable to indoor exposed spare parts: in that condition, outdoor post insulators or special indoor post insulators can be restored.
This standard does not include some requirements involved in selecting post insulators for specific operating conditions. This standard can be used as a reference for post insulators for DC systems. Note: G 8287.2 specifies the dimensions and characteristics of post insulators. 1.2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of this standard, the versions shown are valid. All standards will be revised, and parties using this standard should discuss the possibility of using the latest version of the following standards. GB156-1993 Standard voltage (neq1EC38:1983) GB/T197-1981 General thread tolerances and fits GB311.1-1997 Insulation coordination of high-voltage transformer substation equipment (neqTEC71-1:1993) GB/T494-1998 Petroleum asphalt for construction (eqVASTMD312:1995) GB772-1987 Technical conditions for high-voltage insulator porcelain parts (negIEC233.1974; IEC168:1979) GB/T775.1.1987 Insulator test methods Part 1: General test methods GB/T775.2-1987 Insulator test methods Part 2: Electrical test methods GB/T 775. 3---1987
Insulator test methods Part 3: Mechanical test methods GB/T1800-1979 Tolerances and fits General standard tolerances and basic deviations GB/T2900.8-1995 Electrical terminology Insulators (neqIEC 471) GB/T4585.1-1984 Artificial pollution transfer test method for high-voltage insulators for AC systems Salt spray method (idtIEC507:1975 part)
GB/T4585.2-1991 Artificial pollution transfer test method for high-voltage insulators for AC systems Solid layer method (evIEC507:1975 part)
GB/T5582--1993 Pollution degree of external insulation of high-voltage power equipment (neg1EC507:1991;1 EC:815:1986 GB/T8287.2—1987 High-voltage post porcelain insulators Part 2: Dimensions and characteristics (neqIEC273:1979) GB/T8411.1--1987 Electric porcelain materials Part - Definitions, classification and properties (neqIEC672-1:1980; IEC67231984)
Approved by the State Administration of Quality and Technical Supervision on August 24, 1998 and implemented on September 1, 1999
GB 8287. 11998
GB12744—1991 Pollution-resistant outdoor trapezoidal pillar porcelain insulator (negIEC168: 1988; IEC273: 1979) GB/T 16927.1—1997 Commercial voltage test technology Part—General test requirements (eqvIEC 60-1: 1989) JB3384—1983 Sampling plan for high-voltage insulators JB367—1984 Radio interference test method for high-voltage insulators Technical conditions for cement adhesives for insulator glueing JB4307—1986
Technical conditions for non-ferrous metal castings for insulators JB 5889 1991
JB5891—1991 Technical conditions for ferrous metal castings for insulators JB/T8177—1995 General technical conditions for hot-dip galvanized layer of metal accessories for insulators JB/Z94—1989 Insulator product packaging
JB/Z2621986 Ultrasonic testing of internal defects of porcelain parts ZB G51 0291987L01—6 Asphalt varnish 1.3 Definitions
Except for the following definitions, the terms used in this standard comply with GB/T2900.8. 1.3.1 Insulators
The term "insulator or post insulator" used in this standard refers to a complete post porcelain insulator or post porcelain insulator element with metal accessories.
1.3.2 Specified characteristics
refers to the value of voltage, mechanical load or other characteristic values specified in the standard, or any other characteristic values agreed upon by the supply and demand parties.
2 Structure, materials and specified characteristics of shrink insulators 2.1 Structure of insulators
The structure of insulators can be divided into the following types: a) Solid cylindrical post insulators, which have external glue-mounted metal accessories and belong to human-shaped insulators (see Figure 1); Note: Solid cylindrical post insulators are also called "pattern post insulators" 6) Cylindrical post insulators with internal cavities and joint glue-mounted or external glue-mounted metal accessories, each of which has an integrally fired internal porcelain partition, and belong to type B insulators (see Figure 2) c) Type A cylindrical post insulators with internal glue-mounted or joint glue-mounted metal accessories (see 3) d) Type B cylindrical post insulators with internal glue-mounted or joint glue-mounted metal accessories (see Figure 4), e) Pin post insulators, which belong to type B insulators (see Figure 5). Foreign: The term cylindrical insulator also includes truncated insulators. 2.2 Insulator materials
The materials of insulator porcelain parts shall comply with the provisions of GB&411.1. The metal accessories of insulators shall comply with the provisions of JB5889 or JB5891. The cement adhesive of insulators shall comply with the provisions of JB4307. The asphalt varnish or asphalt buffer layer evenly coated on the surface of the porcelain bamboo and accessories in contact with the water-mixed adhesive shall comply with the provisions of ZBG51029 or GB/T194. Note: Asphalt should be used after adding solvent. For insulation with higher strength requirements, asphalt varnish should be used. 2.3 Specified characteristics of insulators
The following values represent the characteristics of a complete post insulator: a) Rated voltage;
b) Standard lightning impulse dry withstand voltage;
c) Standard operating impulse wet withstand voltage (only for outdoor insulators with rated voltage of 363kV and above); d) Specified power frequency dry withstand voltage (only for indoor insulators); c) Specified power frequency withstand voltage (for outdoor insulators); GB 8287.1-1998
f) Specified power frequency breakdown voltage (only for insulators of structural types d) and e) specified in 2.1); g) Specified artificial pollution withstand characteristics (only for outdoor insulation of pollution level, m and I); h) Rated mechanical breaking load;
i) Specified important dimensions (including creepage distance). When the purchaser and the supplier have an agreement, the following values may also be included: 1) offset under load;
2) radio interference characteristics.
3 Technical requirements
The insulation shall be manufactured in accordance with this standard and the technical conditions and drawings approved by the prescribed procedures. 3.1. Dimensional and geometric deviations
Dimensional characteristics are specified as follows:
Height:
--Maximum nominal diameter of insulating parts:
--Minimum nominal creepage distance;
--Mounting structure +
Tolerance.
The dimensions of insulators shall be inspected as specified in the drawings. Special attention shall be paid to dimensions that affect interchangeability. 3.1.1--General requirements
Unless otherwise agreed by the supplier and the buyer, the allowable deviation of the scale with specified special tolerances is: when d300, ±(0.04d+1.5)mm
and when d>300: ±(0.025+6)mm
Where d is the dimension to be inspected, in mm. 3.1.2 Creepage distance tolerance
The creepage distance shall comply with the following tolerances:
When the creepage distance is specified in nominal values, including the minimum nominal value: Class 1: ±(0.04d+1.5) mm Class +: negative deviation is -(0.04d+1.5) mm, and positive deviation is not specified. When the creepage distance is specified in minimum values, there shall be no negative deviation, and the positive deviation shall be: Class I: 2×(0.04d+1.5) mm Class I: positive deviation is not specified. 3.1.3 Other tolerances
a) The allowable deviation of the insulator height () is: when h1220 mm, Class 1: ±1 mm, Class I: =2 mm; when h>l 220 mm, =(1.5+0.00]) mm, (h is in mm). b) The tolerance values of the axis straightness of the insulator element and the parallelism of the upper and lower accessory end faces, the maximum offset between the center axes of the upper and lower mounting holes, and the angular offset of the upper and lower mounting holes are as follows (h is the element height): axis straightness
(1.5+0,008h)mm, (h is measured in mm), upper and lower accessory end face parallelism
When h≤1m, [Level I: 0.5 mm, Level I: 1 mmiWhen h>1m, Level II: 0.5h mm, Level I: (0.5+h)mtm, (h is measured in m) Maximum offset between the center axes of the upper and lower mounting holes -2(1+h)mm, th is measured in m).
Angle offset of the upper and lower mounting holes
1\ (original clockwise or counterclockwise direction).
3.1.4 Installation structure
GB 8287. 1-1998bzxZ.net
The center distance deviation of the installation screw hole should not exceed ±0.5mm. The center distance deviation of the installation light hole should not exceed ±1 mm. The installation screw hole deviation shall comply with the medium precision of GB/T 197. The installation light hole deviation shall comply with the ~H116 level in GB/T1800. The effective length of the thread of the operating hole shall not be less than the nominal thread diameter. 3.2 Voltage level and withstand voltage of insulators The rated voltage of the post insulator shall comply with the following levels: 7.2, 12, 24+40.5, 72.5, 126.252, 363, 550 kV. The withstand voltage of the post insulator shall comply with GB311.1. The power frequency breakdown voltage of the B-type insulator with a rated voltage of 40.5 kV and below shall not be less than 1.75 times of the power frequency dry withstand voltage. The withstand voltage values of insulators installed at an altitude of 1 000 m or less and with an ambient temperature within the range of -40°C to +40°C are listed in Table 1. Electrical characteristics of post insulators
Corresponding system
Rated voltage
Rated voltage
+withstand
Power frequency voltage
k (effective value) shall not be less than
Wet withstand
1 tnin
The rated voltage value of the post insulator is selected according to the highest voltage value of the equipment specified in GB156. 2 The power frequency breakdown voltage is only carried out on B-type insulation with a rated voltage of 40.5V or less. 3 The power frequency and switching impulse wet withstand test is only carried out on outdoor insulators. : The wet withstand value of this voltage level should be agreed upon by both the supply and the demander. 3.3 Mechanical strength grade of insulator
Standard lightning impulse
Withstand voltage K
kv (peak value)
not less than
The mechanical strength grade of insulator is determined according to the specified Li Qu destruction load value. The standard values of mechanical strength are as follows: a) Indoor post insulation
2,4+816.25 kN.
h) Outdoor buckled post insulator
2.4.6,8,10,12.5,16.20,25,31,5,40 kN.
Outdoor pin post insulator
3. 75.5.10.20 kN.
Standard operating shock
Mixed withstand voltage
V (grid)
The standard value of mechanical strength is based on the minimum destructive load GB 8287. 1--1998 when the post insulator is installed upright and the load is applied horizontally to its top for bending test.
The destructive load F applied at ε (mnm) above the top of the post insulator can be specified. This load needs to be agreed upon by the supply and demand parties. For indoor post insulators, the value of Pam (z=50mm) is specified. The mechanical strength of tension or compression is not specified. The mechanical strength of torsion is only specified for outdoor rod post insulators. 3.4 Altitude and ambient temperature conditions of the installation site The installation site is generally 1 000 m2 or less. The ambient temperature of the installation site is generally -40℃~+40℃. The external insulation characteristics of the insulator in plateau areas or when the ambient temperature is higher than +10℃ shall comply with the provisions of GB311.1. 3.5 Requirements for individual mechanical tests
For post insulators with a nominal height h>770mm of structural type n) (see 2.1), individual bending tests shall be carried out. The test load shall be equal to 50% of its specified breaking load, and the load shall be applied to four mutually perpendicular directions, and each direction shall last for at least 3s. As an individual bending test on the installed post insulator, it can be replaced by an individual mechanical vibration test on the insulator porcelain before installation with the agreement of both parties. The load should be of sufficient magnitude to ensure that the bending stress reached at each position along the length of the porcelain is at least equal to 70% of the stress at that position at the specified minimum failure load, and should not exceed 100% of the design stress of the porcelain material. Note: For the appropriate method of testing the unassembled fired individual insulators, see Appendix A (suggestive Appendix). 3.6 Requirements for individual electrical tests
For insulators of structural types d) and e) see 2.1), a power frequency or high frequency spark voltage test should be carried out individually: the power frequency spark voltage test should last for 5 min. The commercial frequency spark voltage test should last for 3 s. Note: For pin-type and post insulators, the test on the porcelain before assembly can be used instead of the test on the insulator after assembly, with the agreement between the supplier and the buyer. For insulators of structural type b) (see 2.1), a power frequency spark voltage test should be carried out individually on the porcelain before assembly, and the test should last for 5 min.
3.7 External insulation pollution level of outdoor insulators The external insulation pollution level of outdoor insulators, the artificial pollution tolerance value of each level of external insulation and the creepage distance shall comply with the provisions of CB/T5582.
3.8 Requirements for porcelain parts of insulators
The porcelain parts of insulators shall comply with the provisions of GE772. Note: The impact test is recommended as an effective test method for porcelain parts. The test method shall be determined by the enterprise. 3.9 Temperature cycle test
Insulators shall be subjected to temperature cycle test without damage according to the provisions of GB/T775.1. The temperature difference between hot water and cold water is 50K, and the cycle is 3 times.
3.10 Hot-dip galvanizing of insulator accessories
The hot-dip galvanizing layer of the ferrous metal accessories of insulators shall comply with the provisions of JB/T81771995. 3.11 After-sales service
Within two years from the date of delivery (i.e. the date on which the manufacturer issues the notice of delivery), if the user finds that a product does not meet the requirements of this standard under the conditions of transportation, storage, installation and operation approved by this standard and the prescribed procedures, the manufacturer must replace it free of charge! 4 Test classification, sampling rules and sampling procedures 4.1 Test classification
Insulator tests are divided into the following three categories:
4.1.1 Type test
Type test is used to test the main design characteristics of an insulator. Type test is only carried out for a new design of insulator, and it is repeated only if its structure, material or process changes in the future. When the change affects certain characteristics, only the tests related to these characteristics are repeated. ..comGB 8287. 1---1998
If a certain insulator has passed the wide type test and has a valid test report certificate (this insulator is called a tested insulator), and another newly designed insulator is equivalent to it in mechanical design or electrical design, it is not necessary to conduct mechanical type test or electrical type test, unless otherwise agreed by the supply and demand parties. For the provisions of mechanical design equivalence, see 4.2.3, and for the provisions of electrical design equivalence, see 4.2.2. For the provisions of equivalent artificial pollution tolerance characteristics, see GB12744. The mechanical test report certificate of the type test is valid for 10 years: the electrical test report certificate of the type test is valid forever. 4.1.2 Sampling test
The sampling test is used to check the characteristics of the insulator that change due to the manufacturing process and material properties. The sampling test is used as an acceptance test and should be carried out on the insulators randomly selected from the batch of insulators that have met the requirements of the test. 4.1.3 One-by-one test
The test is used to eliminate defective products. The test is carried out during the manufacturing process. This test is carried out on each insulator. 4.2 Requirements for type test
4. 2.1 Selection of test products
During the type test, the number of test products selected for each destructive test item is 3. The test products should first undergo sampling test and one-by-one test (items repeated with type test are only conducted once) and meet the requirements. Insulators whose performance is affected in the type test should not be submitted for use. Before the type test, the relevant dimensions of the post insulators used for the type test shall be checked: Insulation with dimensions exceeding the tolerance specified in the drawing or this standard may be used for type test, but it shall be considered that it will not affect the test results. Insulators with defect areas on the surface exceeding the allowable value can also be used for type test. 4.2.2 Electrical type test
Electrical type test items shall comply with the provisions of Table 4. The results obtained from the electrical type test of the tested insulators can represent all post insulators that are "electrically equivalent" to it. "Post insulators that are "electrically equivalent" to it refer to post insulators that use the same materials and process as the tested insulators and have the following characteristics compared with the tested insulators: a) The electrical distance is the same or larger!
b) The nominal rod diameter is the same or smaller;
c) The number and position of metal accessories are the same; ) The nominal umbrella distance is the same, with a difference of 5%
e) The nominal umbrella extension is the same, with a difference of =10% f) The umbrella shape is the same:
1 The situation of "electrical design is equivalent" is generally seen on "outdoor rod-shaped support insulators", and is not likely to appear on other support insulators, especially needle support insulators
2 The influence of the shape and size of metal accessories on "electrical design is equivalent" should be considered 4.2.3 Mechanical damage load type test
Bending damage load test is usually carried out on all types of support insulators. When required, tensile, transfer and compression tests can also be used as type tests. In addition to the bending failure load test, the outdoor rod-shaped post insulators shall also be subjected to a torsion test. The results of the mechanical failure load type test of the tested insulators can represent all the post insulators that are "mechanically equivalent". The post insulators that are "mechanically equivalent" are post insulators that are produced in the same manufacturer using the same materials and the same manufacturing process as the tested insulators and have the following characteristics compared with the tested insulators: a) the same nominal rod diameter; ii) the same connection structure between the porcelain parts and the metal accessories; c) the same shape and size of the connection between the metal parts and the porcelain parts; d) the difference in nominal height does not exceed 20%. Notes: 1. Since all these factors affecting the strength of the post insulator (materials, manufacturing process and dimensions) are very different for the "mechanically equivalent", the bending moment strength value (PX), tensile strength value and torsion neck value of the insulators of the "mechanical design H" should be the same as those of the "mechanical design H". 2. When applying the "mechanical design H", the influence of different heights on the compressive strength of the post runner should be considered. CB 8287. 1—1998
3 When determining the "machine design level", the influence of umbrella extension, umbrella distance and umbrella shape changes should be considered. 4.3 Rules and procedures for sampling test
Insulators should be sampled and tested in batches.
The sampling test should be carried out in accordance with JB3384. Sampling should be carried out from batches of insulators that have passed the test one by one. Only the sampling is authorized. Insulators whose performance is affected during the sample test should not be submitted for use. The sample capacity is specified in Table 2. Sampling is carried out in groups according to the insulator test requirements. Each The sample capacity of one group is n2, which is suitable for tests with bending requirements; the sample capacity of the second group is n2, which is suitable for tests with torsion requirements! The sample capacity of the second group is n2, which is suitable for tests with breakdown test requirements.
Table 2 The sample capacity value table of the first sampling
26-~50
First group
Sample capacity
Second n2
Third group
51~500
501~1200
1 201--2 000
Group II
Sample volume wall
Group IIna
Third rough n3
The sampling test is carried out according to the piece-counting primary test procedure. However, if the number of samples in the mechanical destruction test item is greater than or equal to 3, the test is carried out according to the measurement secondary test procedure of AQL-2.5% in JB 3384-83, and its judgment constant is extracted in Table 3. Table 3 Sampling judgment constant
Sample volume cocoon
em Or 2na
If only one test piece does not meet any requirement of the sampling group in the sampling test (if it is judged as a repeated test, it will be counted as one insulator that does not meet the requirement), then a number of insulators twice the size of the first sample should be sampled from the same batch for repeated testing. The repeated test should include the test that failed and the items before the test that have an impact on the test. If any item is still unqualified in the repeated test, the batch is considered unqualified. If 2 or more test pieces do not meet any requirement in Table 5 in the second sampling test, or if they are judged as rejected in the first sampling in a sampling group measurement inspection, the batch is considered unqualified. If only the size inspection fails, it is allowed to select one by one. 5. Test method
The items of type test, sampling test and individual test of insulators are shown in Table 4, Table 5 and Table 6. 5. 1 Dimension and appearance inspection method
Dimension and appearance inspection method shall be in accordance with GB/T775.1. 5.2 Mechanical test method
Mechanical test method of insulator shall be in accordance with GB/775.3. 5.3 Electrical test method
Except as provided below, electrical test method of insulator shall be in accordance with GB/T 775.2. a) Test air condition (including atmospheric condition modification) and wet test condition shall be in accordance with GB/T16927.1. b) For electrical test of insulator with rated voltage of 1 or above 383 kV, insulator shall be vertically mounted on an upright grounded metal support. The top of the metal support shall preferably be a square mounting surface. The width of the side shall be between times and twice the diameter of the metal accessory at the bottom of the insulator. Circular and rectangular mounting surfaces may also be used, but their dimensions shall be within the above-mentioned square mounting surface. To ensure that the shape of the support does not affect the test results, more than 30% of the support height should not exceed the vertical projection of the installation surface. c) The power frequency spark test of insulators of structural types d) and e) (see 2.1) shall be carried out in accordance with GB 775.2. During the high-frequency spark voltage test, the high-frequency voltage shall be an appropriately attenuated AC voltage with a frequency between 100kHz and 500kHz. The test voltage shall be applied continuously for at least 3s and shall be sufficient to produce continuous spark discharge. Then, the power frequency voltage shall be applied to the insulator for 2min or other appropriate methods shall be used to detect the broken insulator. The broken insulator shall be removed. d) The electrical test of cylindrical post insulators with hollows (see 2.1 structural type b)) shall be carried out on the porcelain parts before assembly. During the test, an electrode shall be placed in the cavity to contact the porcelain partition part of the porcelain part. The power frequency spark voltage test on the porcelain part shall be at least 5min. The broken porcelain parts during the test shall be removed by firing. 5.4 Artificial migration test method
The test method for artificial migration of insulation should be in accordance with GB/T 4585.1 or GB/T 4585.2. 5.5 Other test methods
The porosity test and temperature cycle test methods should be in accordance with GB/T 775.1. The test method for coating should be in accordance with JB/T 8177-1995. The ultrasonic flaw detection test method shall be in accordance with JB/Z 262. 6 Test items for insulators
6.1 Type test items
Type test items shall be in accordance with the provisions of Table 4.
Table 4 Type test items
Test name
Fluorescent shock
Voltage withstand test
Operational shock moisture withstand test
Enzyme withstand voltage test
Upper and lower withstand
Electromechanical test
Power frequency moisture withstand
Voltage test
Artificial pollution withstand
Electromechanical destruction
Resistance test
Test basis
Article 3.3 of this standard!
Article 3.2 Articles
Test methods
Article 3.3 of this standard
Article 5.3 of this standard
Article 3.2 of this standard: Article 5.3 of this standard Article 3.2 of this standard
Article 3.7 of this standard
Article 3.3 of this standard
Article 5.3 of this standard
Article 4 of this standard
Article 5.2 of this standard
1 Symbol \ means that this test is not to be carried out. Symbol “—” means that this test is not to be carried out. Indoor branch insulators
2 Impact adhesion voltage test is only applicable to the rated voltage of 363 kV and above outdoor post insulators. 3 The artificial pollution transfer test is only carried out on products of the same pollution transfer level, and the actual training data should be provided after the test. The electrical type test of outdoor post insulators is only carried out on one test piece, but the artificial calcium transfer acceptance test can be carried out on one or several test pieces according to the test conditions. Two test pieces are used to carry out a mechanical damage load test (such as bending). If two mechanical damage load tests are to be carried out, the same number of test pieces shall be selected for the test, but the selected insulators shall only be subjected to the mechanical damage load test. During the test, even if only one insulator does not meet any of the requirements of this table, the type test shall fail. When the supply and demand parties have an agreement, the following test offset test under no-load can also be carried out (test method connection B/I775.3). GB 8287.11998
Radio interference test (test method in accordance with JB3567). 6.2 Sampling test items
Sampling test items shall be in accordance with the provisions of Table 5.
Sampling test items
Serial number!
Test name
Dimension inspection
Balance layer test
Temperature cycle test
Machine-photographed destructive load test
Breakdown test
Porosity test
Same as Table 4 Note 1
Test basis
Article 3.1 of this standard
Article 3.10 of this standard
Article 3.9 of technical standard
Article 3.3 of this standard
Article 3.2 of this standard
Article 3.8 of this standard Article
Test method
Article 5.1 of this standard
Article 5.5 of this standard
Article 5.2 of this standard
Article 5.3 of this standard
Article 5.5 of this standard
The test of the galvanized layer of the structural wall defined in 2.1 shall be carried out on the galvanized wall. If necessary, it is also allowed to test the accessories separately from the same batch of accessories used. In Table 5, the products of structural types a), b) and c) shall be tested according to Article 4.3.1 The first group of test pieces (nt) are selected for testing; for products with structural types d) and e), the first and third groups of test pieces are selected according to Article 4.3.1. Each group of test pieces (n) is tested according to the serial numbers 1.2.3.4.6, and the third group of test pieces (n) is tested according to the serial numbers 1, 3, and 5 in the table. One group of test pieces (such as the first group) can only be used to perform one destructive load test (such as bending). If two destructive load tests (bending and torsion) are to be performed, another group (the second group) of test pieces (n2) should be selected for the tests of serial numbers 1, 3, and 4 (serial number 4 is the torsion destructive load). 6. 3 Test items one by one
The items to be tested one by one shall be as specified in Table 6.
Table 6 Test items one by one
Test name
Appearance inspection
Height grid inspection
Ultrasonic flaw detection test
Bending test one by one
Electrical test one by one
Same as Note 1 of Table 4.
Test basis
Article 3.8 of this standard
Article 3.1.3 of this standard
Article 3.8 of this standard
Article 3.5 of this standard
Article 3.6 of this standard
2The symbol Y indicates that the test is carried out on the porcelain parts before binding. Test method
Article 5.1 of this standard
Article 5.1 of this standard
Article 5.5 of this standard
Article 5.2 of this standard
Article 5.3 of this standard
Structural type defined in 2.1
3Using ultrasonic flaw detector for outdoor rod-shaped support insulators and indoor A-type insulators with a rod diameter greater than 101 mm: bending one by one or testing instrument for insulators with a height h>770 mm. 6)
In the individual tests, if the insulator does not meet any of the requirements specified in Table 6, the insulator is deemed unqualified. 7 Packaging and marking
7.1 Packaging
GB 8287.1-1998
It is recommended that the packaging of insulators adopt the provisions of JB/Z94. 7.2 Marking
The manufacturer's trademark and the year of manufacture shall be clearly and firmly marked on the porcelain parts of the insulators at the positions specified in the drawings. For post insulators with a rated voltage of 126 kV and above, the month of manufacture shall also be marked. When required by the purchaser, the code of the post insulator element shall also be marked with self-adhesive labels or similar methods. Figure 1 Solid cylindrical post insulator (external glue mounting) (joint glue mounting) Cylindrical post insulator with cavity (joint glue mounting) (internal glue mounting) Figure 3 Cylindrical post insulator with internal glue mounting or joint glue mounting metal accessories (type A) (internal glue mounting) GB8287.1—1998 (joint glue mounting) Figure 4 Cylindrical post insulator with internal glue mounting or joint glue mounting metal accessories (type B) Figure 5 Pin post insulatorb) and c) products are tested according to 4.3.1 by extracting the first group of test pieces (nt); for products with structural types d) and e), extract the first and third groups of test pieces according to 4.3.1. Each group of test pieces (n) is tested according to the serial numbers 1.2.3.4.6, and the third group of test pieces (n) is tested according to the serial numbers 1, 3, and 5 in the table. One group of test pieces (such as the first group) can only be used to perform one destructive load test (such as bending). If two destructive load tests (bending and torsion) are to be performed, another group (the second group) of test pieces (n2) should be selected to perform the tests with serial numbers 1, 3, and 4 (serial number 4 is the torsion destructive load). 6.3 Test items one by one
The test items one by one shall be as specified in Table 6.
Table 6 Test items one by one
Test name
Appearance inspection
Height grid inspection
Ultrasonic flaw detection test
Bending test one by one
Electrical test one by one
Same as Note 1 of Table 4.
Test basis
Article 3.8 of this standard
Article 3.1.3 of this standard
Article 3.8 of this standard
Article 3.5 of this standard
Article 3.6 of this standard
2The symbol Y indicates that the test is carried out on the porcelain parts before binding. Test method
Article 5.1 of this standard
Article 5.1 of this standard
Article 5.5 of this standard
Article 5.2 of this standard
Article 5.3 of this standard
Structural type defined in 2.1
3Using ultrasonic flaw detector for outdoor rod-shaped support insulators and indoor A-type insulators with a rod diameter greater than 101 mm: bending one by one or testing instrument for insulators with a height h>770 mm. 6)
In the individual tests, if the insulator does not meet any of the requirements specified in Table 6, the insulator is deemed unqualified. 7 Packaging and marking
7.1 Packaging
GB 8287.1-1998
It is recommended that the packaging of insulators adopt the provisions of JB/Z94. 7.2 Marking
The manufacturer's trademark and the year of manufacture shall be clearly and firmly marked on the porcelain parts of the insulators at the positions specified in the drawings. For post insulators with a rated voltage of 126 kV and above, the month of manufacture shall also be marked. When required by the purchaser, the code of the post insulator element shall also be marked with self-adhesive labels or similar methods. Figure 1 Solid cylindrical post insulator (external glue mounting) (joint glue mounting) Cylindrical post insulator with cavity (joint glue mounting) (internal glue mounting) Figure 3 Cylindrical post insulator with internal glue mounting or joint glue mounting metal accessories (type A) (internal glue mounting) GB8287.1—1998 (joint glue mounting) Figure 4 Cylindrical post insulator with internal glue mounting or joint glue mounting metal accessories (type B) Figure 5 Pin post insulatorb) and c) products are tested according to 4.3.1 by extracting the first group of test pieces (nt); for products with structural types d) and e), extract the first and third groups of test pieces according to 4.3.1. Each group of test pieces (n) is tested according to the serial numbers 1.2.3.4.6, and the third group of test pieces (n) is tested according to the serial numbers 1, 3, and 5 in the table. One group of test pieces (such as the first group) can only be used to perform one destructive load test (such as bending). If two destructive load tests (bending and torsion) are to be performed, another group (the second group) of test pieces (n2) should be selected to perform the tests with serial numbers 1, 3, and 4 (serial number 4 is the torsion destructive load). 6.3 Test items one by one
The test items one by one shall be as specified in Table 6.
Table 6 Test items one by one
Test name
Appearance inspection
Height grid inspection
Ultrasonic flaw detection test
Bending test one by one
Electrical test one by one
Same as Note 1 of Table 4.
Test basis
Article 3.8 of this standard
Article 3.1.3 of this standard
Article 3.8 of this standard
Article 3.5 of this standard
Article 3.6 of this standard
2The symbol Y indicates that the test is carried out on the porcelain parts before binding. Test method
Article 5.1 of this standard
Article 5.1 of this standard
Article 5.5 of this standard
Article 5.2 of this standard
Article 5.3 of this standard
Structural type defined in 2.1
3Using ultrasonic flaw detector for outdoor rod-shaped support insulators and indoor A-type insulators with a rod diameter greater than 101 mm: bending one by one or testing instrument for insulators with a height h>770 mm. 6)
In the individual tests, if the insulator does not meet any of the requirements specified in Table 6, the insulator is deemed unqualified. 7 Packaging and marking
7.1 Packaging
GB 8287.1-1998
It is recommended that the packaging of insulators adopt the provisions of JB/Z94. 7.2 Marking
The manufacturer's trademark and the year of manufacture shall be clearly and firmly marked on the porcelain parts of the insulators at the positions specified in the drawings. For post insulators with a rated voltage of 126 kV and above, the month of manufacture shall also be marked. When required by the purchaser, the code of the post insulator element shall also be marked with self-adhesive labels or similar methods. Figure 1 Solid cylindrical post insulator (external glue mounting) (joint glue mounting) Cylindrical post insulator with cavity (joint glue mounting) (internal glue mounting) Figure 3 Cylindrical post insulator with internal glue mounting or joint glue mounting metal accessories (type A) (internal glue mounting) GB8287.1—1998 (joint glue mounting) Figure 4 Cylindrical post insulator with internal glue mounting or joint glue mounting metal accessories (type B) Figure 5 Pin post insulator
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