Some standard content:
Machinery Industry Standard of the People's Republic of China
JB/T 8509 - 1996
High Voltage Line Post Porcelain Insulators
1996-11-07 Issued
Ministry of Machinery Industry of the People's Republic of China
1997-07-01 Implementation
JB/T8509-1996
This standard adopts the following standards of the International Electrotechnical Commission (IEC) in a non-equivalent manner: IEC Standard 720 (1981 First Edition) Line Post Insulator Characteristics; a.
IEC Standard 383-1 (1993 First Edition) Overhead Line Insulators with Rated Voltages Higher Than 1000V Part 1: AC Systems b.
Porcelain or glass insulator components - Definitions, acid test methods and acceptance criteria. Based on the production and use conditions in my country and the principle of being consistent with IEC standards as much as possible. In terms of size and characteristics, the rated lightning impulse withstand voltage value has been increased by two levels, 105kV and 150kV; the rated bending damage value has been increased by two levels, 3kN and 5kN; the connection method between the steel foot and the base has been increased to inseparable type (glue fixing); the dimensional deviation of the structure height and the umbrella diameter of the porcelain parts is stricter than EC720 and IEC383-1. In terms of technical requirements, the hole image test is stricter than IEC383; ultrasonic inspection and impact test are added to each test item to eliminate porcelain parts with internal defects; the measurement sampling plan is in accordance with the corresponding provisions of JB3384. This standard was proposed by the National Insulator Standardization Technical Committee; this standard is under the jurisdiction of the Xi'an Electric Porcelain Research Institute; this standard was drafted by the Xi'an Electric Porcelain Research Room; the main drafters of this standard are Ding Jingling and Cai Mei. The cost standard was first issued on November 7, 1996; this standard was entrusted to the Xi'an Electric Cable Research Institute for interpretation. I
1 Scope
Machinery Industry Standard of the People's Republic of China
High Voltage Line Post Porcelain Insulators
JB/T8509-1996
This standard specifies the type and size, main electromechanical characteristics and technical requirements of high voltage line post porcelain insulators (hereinafter referred to as insulators), as well as the conditions, inspection rules, test methods, packaging and marking for testing the characteristic parameters in these technical requirements. This standard is applicable to insulators used for insulation and supporting conductors in AC overhead power lines with a nominal voltage higher than 1000V, a frequency not greater than 100Hz, an altitude not exceeding 1000m, and in ordinary areas and medium and heavy pollution areas. The ambient temperature of the installation site is between -40 and +40℃. This standard does not apply to insulators used under conditions of severe corrosion of insulating parts and metal accessories. Note: When the altitude exceeds 1000m, its applicability shall be determined according to the correction method specified in the corresponding standard. 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, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest versions of the following standards. GB772-87
GB775.1～775.3—87
GB2900.8-83
GB3970—83
GB5958-86
JB3384—83
JB4307-86
JB5891--91
JB/Z262-86
JB/Z9489
3 Terminology
High Voltage Insulators Technical conditions for porcelain insulators
Test methods for insulators
Electrical terminologyInsulators
Pin insulators for power and communication linesSteel foot insulatorsGeneral technical conditions for hot-dip galvanized coatings on metal accessoriesSampling plan for high-voltage insulators
Technical conditions for cement adhesives for insulator bondingTechnical conditions for ferrous metal castings for insulatorsUltrasonic detection of internal defects in porcelain parts
Packaging of insulator products
The definitions of terms used in this standard shall be in accordance with the provisions of GB 2900.8. 4 Product classification
4.1 Insulators are divided into eight grades according to the rated lightning impulse withstand voltage value: 95, 105, 125, 150, 170, 200, 250 and 325kV; according to the rated bending failure load value, they are divided into four grades: 3, 5, 8 and 12.5kN; according to their installation methods, they are divided into two types: vertical installation (Figure 1, 2) and horizontal installation (Figure 1, 3); according to their connection method with the high-voltage conductor, they are divided into two types: top binding type (Figure 1) and top wire clamp type (Figure 2, 3); according to the connection method between the steel foot and the base, they are divided into two types: detachable (threaded connection) and inseparable. 4.2 The structure and main dimensions of the insulator shall comply with the provisions of Table 1 and Table 2. 4.2.1 The head size of the top binding type insulator shall comply with the provisions of Figure 4; the size of the fixed wire clamp of the pre-clamp type insulator shall comply with the provisions of Figure 5.
4.2.2 The size of the recessed part and screw hole of the insulator base shall comply with the provisions of Figure 7. 4.2.3 The deviation of the main dimensions of the insulator shall comply with the following provisions, and the deviation of other dimensions of the porcelain parts shall comply with the corresponding provisions of GB772. Approved by the Ministry of Machinery Industry on November 7, 1996
Implementation on July 1, 1997
Structural height H: taHmm;
Porcelain part umbrella diameter D: ±0.04Dmm;
Minimum nominal creepage distance L:
When L<300mm: ±(Add 1.5)mm;
When L>300 mm: ±(Number*+e) mm;Insulator models and symbol meanings
Model representation method:
Symbol meaning:
PS-line post porcelain insulator;
JB/T8509-1996
Connection method between base and steel foot
Installation method
Rated bending failure load, kN
Rated lightning full-wave impulse withstand voltage, kVDesign serial number (expressed in Arabic numerals)
Structural features
Product name
One-line clamp type, binding type is not indicated;
NLonger creepage distance (normal creepage distance is not indicated);Z
Vertical installation, horizontal installation is not indicated;
-Threaded connection type.
For example: Ps
N--200/12.5
Threaded connection
Vertical installation
-Bending failure load, kiV
Lightning full-wave impulse withstand voltage, kv
-Longer creepage distance
One-wire clamp type
Line post porcelain insulator
JB/T8509-1996
Figure 1 Top-binding type line post porcelain insulatorFigure 2 Vertical installation top wire clamp type line post porcelain insulatorJB/T8509-19 96
Figure 3 Horizontally mounted top clamp type line post porcelain insulator 100
Head dimensions for horizontal or vertical installation
8124max
873±3
Figure 4b Head dimensions for horizontal or vertical installation 8170
152±3
Figure 4c Head dimensions for vertical installation
Figure 4 Standard dimensions for tied head
JB/T8509-1996
Bolt with locking device
Section AA||tt| |Note: Dimensions a, b, c and the minimum values shown in the figure should be checked with a gauge (see Figure 6) Figure 5 Head clamp dimensions
Note: Except for the figure, the deviation is ±0.05mm
Figure 6 Clamp gauge dimensions
Upper part of cap outline
Insulator model
PS—105/3Z
PSN-105/5ZS
PSN-95/8ZS
PSN—125/8ZS
PSN-170/8ZS
PS—150/12.5Z| |tt||PS — 170/12.5ZS | 12.5ZS
PSN--200/12.5ZS
PSN—250/12.5ZS
PSN—325/12.5ZS
JB/T8509-1996
M16, M20 engagement length 22
M24 engagement length 25
Bottom metal accessories recessed part and screw hole size Top binding type line post porcelain insulator size and characteristics Lightning
Full wave impulse
Withstand voltage
kv (peak value)
Not less than
Power frequency moisture withstand minimum nominal rated bending nominal total height Insulation
Voltage
Creep distance Destruction load
Maximum nominal
(effective value)
Not less than
Head size
Inch Drawing number
4b or 4c
4b or 4c| |tt||4b or 4c
4b or 4c
4b or 4c
4b or 4c
Base connection
Contact face
Nominal diameter
Base center
Insulator model
PSJ--125/12.5ZS
PSJ125/12.5S
PSJ-170/12.5ZS
PSJ--170/12.5S
PSJ-200/12.5ZS
PSJ-200/12.5S
PSJ—250/12.5ZS
PSJ—250/12.5S
PSJ— 325/12.5ZS
PSJ-325/12.5S
PSJN--95/12.5ZS
PSJN—95/12.5S
PSJN—125/12.5ZS
PSJN125/12.5S
.5 ZS
PSJN--170/12.5S
PSJN--200/12.5ZS
PSJN--200/12.5S
PSJN--250/12.5ZS
PSJN-325/12.5S Technical requirements JB/T8509-1996 Dimensions and characteristics of pre-clamp type line post porcelain insulators Table 2 Insulators Full wave impulse withstand voltage V (peak value) Not less than Rated bending nominal height of base contact Insulating parts Maximum nominal contact surface Creepage distance Destruction load Voltage (effective value) Not less than Nominal diameter Center of base Insulators should be manufactured according to the drawings approved by this standard and the prescribed procedures. The electromechanical properties of insulators should comply with the requirements of Tables 1 and 2. 5.1
5.2 The appearance quality of insulator porcelain parts shall comply with the provisions of GB772. The exposed surface of insulator porcelain parts shall be evenly covered with a layer of enamel. 5.3 The cross section of insulator porcelain parts shall be homogeneous, and there shall be no penetration after the porosity test. The pressure of the porosity test shall not be less than 20MPa, and the product of pressure and time (h) shall not be less than 180MPa·h. 5.4 Insulators shall be glued with cement adhesive of not less than Class II specified in JB4307. The porcelain parts and metal accessories shall be evenly coated with a buffer layer on the contact part with the cement, and a buffer pad shall be placed between the porcelain parts and the base. The maximum exposed sand size after glueing shall not exceed 10mm. 5.5 The insulator porcelain parts, base, wire clamp and stud bolts (or steel feet) shall be on the same axis, and there shall be no obvious skew. After consultation between the supply and demand parties, a "standard sample" shall be selected for comparison and inspection. 5.6 Before gluing, the porcelain parts of the insulators shall be subjected to ultrasonic inspection one by one. There shall be no defects that can be found by ultrasonic (such as raw burning, oxidation cracking and pore interlayer, etc.) inside the porcelain parts. When ultrasonic inspection cannot be used due to the structure of the porcelain parts, other effective methods such as impact test are allowed. 7
JB/T8509-1996
5.7 The insulator shall be able to withstand three temperature cycle tests without damage. The test temperature difference shall be determined in accordance with the provisions of GB772. 5.8 The surface of the metal accessories of the insulator shall be hot-dip galvanized, and its zinc layer shall comply with the relevant provisions of GB5958. After hot-dip galvanizing, the internal threads of the base screw holes are allowed to be returned. The zinc layer is not tested but anti-rust oil is required. 5.9 When the nominal height of the insulator is greater than 600mm, a four-way bending load test shall be carried out. The test load is 50% of the rated bending failure load, and each time lasts for at least 3$.
5.10 The fastening part of the insulator base shall comply with the provisions of Figure 7. The threaded parts of the base, steel foot and stud bolts shall comply with the corresponding provisions of GB3970.
5.11 The appearance quality and unmarked dimensional deviation of the insulator clamp, base, steel foot and stud bolts shall comply with the relevant provisions of JB5891 and GB3970 respectively.
5.12 Within two years from the date of delivery (i.e. the date on which the supplier issues the delivery notice), if the buyer finds that the insulator does not meet this standard under the conditions of complying with this standard and the transportation, storage and installation regulations approved according to the prescribed procedures, the supplier must replace it free of charge. 6 Inspection rules and test methods
6.1 Insulators shall be inspected by the supplier's quality inspection department, and the supplier shall ensure that the insulators shipped from the factory meet the requirements of this standard. 6.2 Insulators shall be inspected in batches, and the same model of insulators made by the same process method shall be counted as one batch, and the number N of each batch shall not exceed 3200. When there are more than 3200 insulators, they shall be divided into batches of 1200-3200 insulators each, and tested and assessed separately.
6.3 The inspection of insulators is divided into individual tests, sampling tests and type tests. In addition to complying with the provisions of this standard, the test methods shall also comply with the provisions of GB775.1~755.3, GB5958 and JB/Z262. 6.3.1 Individual tests: Insulators shall be inspected one by one according to the provisions of Table 3. If any of the requirements specified in Table 3 are found to be not met, the insulator shall be unqualified.
Table 3 Test items for insulators one by one
Test name
Appearance inspection
Ultrasonic inspection
Four-way bending withstand load test
Test basis
Articles 5.2, 5.4, 5.5, 5.8, 5.11 of this standard Article 5.6 of this standard
Article 5.9 of this standard
Test method
JB/Z262
6.3.2 Sampling test: The sampling test shall be carried out by randomly selecting specimens according to the number of specimens specified in Table 4 after each test is passed, and the test shall be carried out according to the procedures in Table 4.
The insulator bending failure load test in the sampling test items adopts the metrological secondary sampling plan, and the size inspection, temperature cycle test and porosity test adopt the piece-count secondary sampling plan. The acceptance quality level (AQL) is 2.5%, and the determination constant, determination criteria and determination procedure are in accordance with the provisions of GB3384. The zinc layer test, inspection rules and determination criteria are in accordance with the provisions of GB5958. 8
Test name
Dimension inspection
Zinc layer testbZxz.net
Temperature cycle test
Insulator bending and breaking load test
Hole gland test
JB/T8509-1996
Table 4 Insulator sampling test items
Number of test batches (pieces)
Test basis
Articles 4.2, 5.4, 5.5, 5.10, 5.11 of this standard Article 5.8 of this standard
Article 5.7 of this standard
Article 5.1 of this standard
Article 5.3 of this standard
N≤1200
12005ZS
PSJ-200/12.5S
PSJ—250/12.5ZS
PSJ—250/12.5S
PSJ—325/12.5ZS
PSJ-325/12.5S
PSJN--95/12.5ZS
PSJN—95/12.5S
PSJN—125/12.5ZS
PSJN125/12.5S
PSJN—170/12.5ZS
PSJN—170/12.5S
PSJN—200/12.5 ZS
PSJN—200/12.5S
PSJN—250/12.5ZS
P SJN—250/12.5S
PSJN—325/12.5ZS
PSJN-325/12.5S
Technical requirements
JB/T8509-1996
Table 2: Dimensions and characteristics of pre-clamp type line post porcelain insulators
Insulator
Full wave impulse
Withstand voltage
V (peak Value)
not less than
work load minimum nominal rated bending nominal total height base connection
insulating part
maximum nominal contact surface diameter
climbing The electric distance damage load
under voltage
(effective value)
is not less than
the nominal diameter
the center of the base
the insulator should be based on this The insulator shall be manufactured according to the drawings approved by the standards and prescribed procedures. The electromechanical properties of the insulator shall comply with the provisions of Table 1 and Table 2. 5.1
5.2 The appearance quality of the insulator porcelain parts shall comply with the provisions of GB772. The exposed surface of the insulator porcelain parts shall be evenly 5.3 The cross section of the insulator porcelain should be homogeneous and there should be no penetration after the porosity test. The pressure of the porosity test should be no less than 20MPa, and the product of pressure and time (h) should be no less than 180MPa. h. 5.4 The insulator should be glued with cement adhesive of not less than Class II specified in JB4307. The porcelain parts and metal accessories should be evenly coated with a buffer layer on the contact part with the cement. A buffer pad should be placed between the porcelain parts and the base. The maximum exposed sand size after installation shall not exceed 10mm. 5.5 The porcelain parts, base, wire clamp and stud bolts (or steel feet) of the insulator shall be on the same axis and shall not be obviously skewed. The selection of " 5.6 Before gluing, each insulator porcelain piece shall be subjected to ultrasonic inspection. There shall be no defects that can be found by ultrasonic waves (such as raw burning, oxidation cracking and pore interlayer, etc.) inside the porcelain piece. When ultrasonic inspection is not possible due to reasons other effective methods such as impact test are allowed, 7
JB/T8509-1996
5.7 Insulators should be able to withstand three temperature cycle tests without damage. The test temperature difference Determined according to the provisions of GB772. 5.8 The surface of the metal accessories of the insulator shall be hot-dip galvanized, and the zinc layer shall comply with the relevant provisions of GB5958. The internal thread of the base screw hole shall be hot-dip galvanized to allow for wire return, and the zinc layer is not required to be tested but anti-rust oil shall be applied. When the height is greater than 600mm, a four-way bending load test shall be carried out, with the test load being 50% of the rated bending load, and each test lasting at least 3 hours.
5.10 The fastening parts of the insulator base shall comply with the provisions of Figure 7. The threaded parts of the base, steel foot and stud bolts shall comply with the relevant provisions of GB3970.
5.11 The appearance quality and unmarked dimensional deviation of the insulator item clamp, base, steel foot and stud bolts shall be respectively It complies with the relevant regulations of JB5891 and GB3970.
5.12 Within two years from the date of delivery (i.e. the date on which the supplier issues the delivery notice), under the conditions of compliance with this standard and the transportation, storage and installation regulations approved in accordance with the prescribed procedures, if the purchaser finds that the When the insulator does not meet the requirements of this standard, the supplier must replace it free of charge. 6 Inspection rules and test methods
6.1 The insulator shall be inspected by the supplier's quality inspection department. The supplier shall ensure that the insulators shipped from the factory meet the requirements of this standard. 6.2 Insulators should be inspected in batches. Insulators of the same type made by the same process are counted as one batch. The number N of each batch should not exceed 3200. When there are more than 3200 insulators, they should be divided into batches of 1200-3200. The batches consisting of only insulators are tested and evaluated separately.
6.3 The inspection of insulators is divided into individual tests, sampling tests and type tests. In addition to complying with the provisions of this standard, the test methods shall also comply with the provisions of GB775.1~755.3, GB5958 and JB/Z262. 6.3. 1 Test one by one: Insulators should be checked one by one according to the requirements of Table 3. If any of the requirements specified in Table 3 are found not to be met, the insulator is unqualified.
Table 3 Insulator test items one by one
Test name
Appearance inspection
Ultrasonic inspection
Four-way bending withstand load test
Test Based on
Articles 5.2, 5.4, 5.5, 5.8, 5.11 of this standard Article 5.6 of this standard
Article 5.9 of this standard
Test method
JB/Z262| |tt||6.3.2 Sampling test: Sampling test shall be carried out by randomly selecting samples according to the number of samples specified in Table 4 after each test is qualified, and the test shall be carried out according to the procedure in Table 4.
The insulator bending failure load test in the sampling test project adopts a metrological secondary sampling plan, and the size inspection, temperature cycle test and porosity test adopt a piece-count secondary sampling plan. The acceptance quality level (AQL) is 2.5%. The determination constants, determination criteria and determination procedures shall comply with the provisions of GB3384. The zinc layer test, inspection rules and determination criteria shall comply with the provisions of GB5958. 8
Test name
Dimension inspection
Zinc layer test
Temperature cycle test
Insulator bending and breaking load test
||Glandularity test
JB/T8509-1996
Table 4 Insulator sampling test items
Number of test batches (pieces)
Test basis||tt| |Articles 4.2, 5.4, 5.5, 5.10, 5.11 of this standard Article 5.8 of this standard
Article 5.7 of this standard
Article 5.1 of this standard
Article 5.3 of this standard| |tt||N≤1200
12005ZS
PSJ-200/12.5S
PSJ—250/12.5ZS
PSJ—250/12.5S
PSJ—325/12.5ZS
PSJ-325/12.5S
PSJN--95/12.5ZS
PSJN—95/12.5S
PSJN—125/12.5ZS
PSJN125/12.5S
PSJN—170/12.5ZS
PSJN—170/12.5S
PSJN—200/12.5 ZS
PSJN—200/12.5S
PSJN—250/12.5ZS
P SJN—250/12.5S
PSJN—325/12.5ZS
PSJN-325/12.5S
Technical requirements
JB/T8509-1996
Table 2: Dimensions and characteristics of pre-clamp type line post porcelain insulators
Insulator
Full wave impulse
Withstand voltage
V (peak Value)
not less than
work load minimum nominal rated bending nominal total height base connection
insulating part
maximum nominal contact surface diameter
climbing The electric distance damage load
under voltage
(effective value)
is not less than
the nominal diameter
the center of the base
the insulator should be based on this The insulator shall be manufactured according to the drawings approved by the standards and prescribed procedures. The electromechanical properties of the insulator shall comply with the provisions of Table 1 and Table 2. 5.1
5.2 The appearance quality of the insulator porcelain parts shall comply with the provisions of GB772. The exposed surface of the insulator porcelain parts shall be evenly 5.3 The cross section of the insulator porcelain should be homogeneous and there should be no penetration after the porosity test. The pressure of the porosity test should be no less than 20MPa, and the product of pressure and time (h) should be no less than 180MPa. h. 5.4 The insulator should be glued with cement adhesive of not less than Class II specified in JB4307. The porcelain parts and metal accessories should be evenly coated with a buffer layer on the contact part with the cement. A buffer pad should be placed between the porcelain parts and the base. The maximum exposed sand size after installation shall not exceed 10mm. 5.5 The porcelain parts, base, wire clamp and stud bolts (or steel feet) of the insulator shall be on the same axis and shall not be obviously skewed. The selection of " 5.6 The insulator porcelain parts should be ultrasonically inspected before gluing. There should be no defects that can be found by ultrasound (such as raw burning, oxidation cracking and pore interlayer, etc.) inside the porcelain parts. When ultrasonic inspection is not possible due to reasons other effective methods such as impact test are allowed, 7
JB/T8509-1996
5.7 Insulators should be able to withstand three temperature cycle tests without damage. The test temperature difference Determined according to the provisions of GB772. 5.8 The surface of the metal accessories of the insulator shall be hot-dip galvanized, and the zinc layer shall comply with the relevant provisions of GB5958. The internal thread of the base screw hole shall be hot-dip galvanized to allow for wire return, and the zinc layer is not required to be tested but anti-rust oil shall be applied. When the height is greater than 600mm, a four-way bending load test shall be carried out, with the test load being 50% of the rated bending load, and each test lasting at least 3 hours.
5.10 The fastening parts of the insulator base shall comply with the provisions of Figure 7. The threaded parts of the base, steel foot and stud bolts shall comply with the relevant provisions of GB3970.
5.11 The appearance quality and unmarked dimensional deviation of the insulator clamp, base, steel foot and stud bolts shall be respectively It complies with the relevant regulations of JB5891 and GB3970.
5.12 Within two years from the date of delivery (i.e. the date on which the supplier issues the delivery notice), under the conditions of compliance with this standard and the transportation, storage and installation regulations approved in accordance with the prescribed procedures, if the purchaser finds that the When the insulator does not meet the requirements of this standard, the supplier must replace it free of charge. 6 Inspection rules and test methods
6.1 The insulator shall be inspected by the supplier's quality inspection department. The supplier shall ensure that the insulators shipped from the factory meet the requirements of this standard. 6.2 Insulators should be inspected in batches. Insulators of the same type made by the same process method are counted as one batch. The number N of each batch should not exceed 3200. When there are more than 3200 insulators, they should be divided into batches of 1200-3200. The batches consisting of only insulators are tested and evaluated separately.
6.3 The inspection of insulators is divided into individual tests, sampling tests and type tests. In addition to complying with the provisions of this standard, the test methods shall also comply with the provisions of GB775.1~755.3, GB5958 and JB/Z262. 6.3. 1 Test one by one: Insulators should be checked one by one according to the requirements of Table 3. If any of the requirements specified in Table 3 are found not to be met, the insulator is unqualified.
Table 3 Insulator test items one by one
Test name
Appearance inspection
Ultrasonic inspection
Four-way bending withstand load test
Test Based on
Articles 5.2, 5.4, 5.5, 5.8, 5.11 of this standard Article 5.6 of this standard
Article 5.9 of this standard
Test method
JB/Z262| |tt||6.3.2 Sampling test: Sampling test shall be carried out by randomly selecting test samples according to the number of test samples specified in Table 4 after each test is qualified, and the test shall be carried out according to the procedure in Table 4.
The insulator bending failure load test in the sampling test project adopts a metrological secondary sampling plan, and the size inspection, temperature cycle test and porosity test adopt a piece-count secondary sampling plan. The acceptance quality level (AQL) is 2.5%. The determination constants, determination criteria and determination procedures shall comply with the provisions of GB3384. The zinc layer test, inspection rules and determination criteria shall comply with the provisions of GB5958. 8
Test name
Dimension inspection
Zinc layer test
Temperature cycle test
Insulator bending and breaking load test
||Glandularity test
JB/T8509-1996
Table 4 Insulator sampling test items
Number of test batches (pieces)
Test basis||tt| |Articles 4.2, 5.4, 5.5, 5.10, 5.11 of this standard Article 5.8 of this standard
Article 5.7 of this standard
Article 5.1 of this standard
Article 5.3 of this standard| |tt||N≤1200
12004 The insulator shall be glued with cement adhesive of not less than Class II specified in JB4307. A buffer layer shall be evenly applied to the porcelain parts and metal accessories and the cement contact part, and a buffer pad shall be placed between the porcelain parts and the base. The maximum exposed sand size after glueing shall not exceed 10mm. 5.5 The porcelain parts, base, wire clamps and stud bolts (or steel feet) of the insulator shall be on the same axis and shall not be obviously skewed. After consultation between the supply and demand parties, a "standard sample" shall be selected for comparison and inspection. 5.6 The porcelain parts of the insulator shall be ultrasonically inspected one by one before glueing, and there shall be no defects that can be found by ultrasound inside the porcelain parts (such as raw burning, oxidation cracking and pore interlayer, etc.). When ultrasonic inspection cannot be used due to the structure of the porcelain parts, other effective methods such as impact test are allowed. 7
JB/T8509-1996
5.7 The insulator shall be able to withstand three temperature cycle tests without damage, and the test temperature difference shall be determined according to the provisions of GB772. 5.8 The surface of the metal accessories of the insulator shall be hot-dip galvanized, and the zinc layer shall comply with the relevant provisions of GB5958. The internal thread of the base screw hole shall be hot-dip galvanized and the wire is allowed to be returned. The zinc layer is not tested but anti-rust oil is required. 5.9 When the nominal height of the insulator is greater than 600mm, a four-way bending load test shall be carried out. The test load is 50% of the rated bending failure load, and each test lasts for at least 3 hours.
5.10 The fastening part of the insulator base shall comply with the provisions of Figure 7. The threaded part of the base, steel foot, and stud bolts shall comply with the corresponding provisions of GB3970.
5.11 The appearance quality and unnoted dimensional deviation of the insulator's wire clamp, base, steel foot, and stud bolts shall comply with the relevant provisions of JB5891 and GB3970 respectively.
5.12 Within two years from the date of delivery (i.e. the date on which the supplier issues a notice of delivery), if the purchaser finds that the insulator does not meet this standard, the supplier must replace it free of charge, subject to compliance with this standard and the transportation, storage and installation regulations approved in accordance with the prescribed procedures. 6 Inspection rules and test methods
6.1 Insulators shall be inspected by the supplier's quality inspection department, and the supplier shall ensure that the insulators leaving the factory meet the requirements of this standard. 6.2 Insulators shall be inspected in batches, and insulators of the same model made by the same process method shall be counted as one batch, and the number N of each batch shall not exceed 3,200. When there are more than 3,200 insulators, they shall be divided into batches of 1,200 to 3,200 insulators each, and tested and assessed separately.
6.3 The inspection of insulators is divided into individual tests, sampling tests and type tests. In addition to complying with the provisions of this standard, the test methods shall also comply with the provisions of GB775.1~755.3, GB5958 and JB/Z262. 6.3.1 Individual tests: Insulators shall be inspected one by one according to the provisions of Table 3. If any of the requirements specified in Table 3 are found to be not met, the insulator shall be unqualified.
Table 3 Test items for insulators one by one
Test name
Appearance inspection
Ultrasonic inspection
Four-way bending withstand load test
Test basis
Articles 5.2, 5.4, 5.5, 5.8, 5.11 of this standard Article 5.6 of this standard
Article 5.9 of this standard
Test method
JB/Z262
6.3.2 Sampling test: The sampling test shall be carried out by randomly selecting specimens according to the number of specimens specified in Table 4 after each test is passed, and the test shall be carried out according to the procedures in Table 4.
The insulator bending failure load test in the sampling test items adopts the metrological secondary sampling plan, and the size inspection, temperature cycle test and porosity test adopt the piece-count secondary sampling plan. The acceptance quality level (AQL) is 2.5%, and the determination constant, determination criteria and determination procedure are in accordance with the provisions of GB3384. The zinc layer test, inspection rules and determination criteria are in accordance with the provisions of GB5958. 8
Test name
Dimension inspection
Zinc layer test
Temperature cycle test
Insulator bending and breaking load test
Hole gland test
JB/T8509-1996
Table 4 Insulator sampling test items
Number of test batches (pieces)
Test basis
Articles 4.2, 5.4, 5.5, 5.10, 5.11 of this standard Article 5.8 of this standard
Article 5.7 of this standard
Article 5.1 of this standard
Article 5.3 of this standard
N≤1200
12004 The insulator shall be glued with cement adhesive of not less than Class II specified in JB4307. A buffer layer shall be evenly applied to the porcelain parts and metal accessories and the cement contact part, and a buffer pad shall be placed between the porcelain parts and the base. The maximum exposed sand size after glueing shall not exceed 10mm. 5.5 The porcelain parts, base, wire clamps and stud bolts (or steel feet) of the insulator shall be on the same axis and shall not have obvious skewness. After consultation between the supply and demand parties, a "standard sample" shall be selected for comparison and inspection. 5.6 The porcelain parts of the insulator shall be ultrasonically inspected one by one before glueing, and there shall be no defects that can be found by ultrasound inside the porcelain parts (such as raw burning, oxidation cracking and pore interlayer, etc.). When ultrasonic inspection cannot be used due to the structure of the porcelain parts, other effective methods such as impact test are allowed. 7
JB/T8509-1996
5.7 The insulator shall be able to withstand three temperature cycle tests without damage, and the test temperature difference shall be determined according to the provisions of GB772. 5.8 The surface of the metal accessories of the insulator shall be hot-dip galvanized, and the zinc layer shall comply with the relevant provisions of GB5958. The internal thread of the base screw hole is allowed to be returned after hot-dip galvanizing. The zinc layer is not tested but anti-rust oil is required. 5.9 When the nominal height of the insulator is greater than 600mm, a four-way bending load test shall be carried out. The test load is 50% of the rated bending failure load, and each test lasts for at least 3 hours.
5.10 The fastening part of the insulator base shall comply with the provisions of Figure 7. The threaded part of the base, steel foot, and stud bolts shall comply with the corresponding provisions of GB3970.
5.11 The appearance quality and unnoted dimensional deviation of the insulator's wire clamp, base, steel foot, and stud bolts shall comply with the relevant provisions of JB5891 and GB3970 respectively.
5.12 Within two years from the date of delivery (i.e. the date on which the supplier issues a notice of delivery), if the purchaser finds that the insulator does not meet this standard, the supplier must replace it free of charge, subject to compliance with this standard and the transportation, storage and installation regulations approved in accordance with the prescribed procedures. 6 Inspection rules and test methods
6.1 Insulators shall be inspected by the supplier's quality inspection department, and the supplier shall ensure that the insulators leaving the factory meet the requirements of this standard. 6.2 Insulators shall be inspected in batches, and insulators of the same model made by the same process method shall be counted as one batch, and the number N of each batch shall not exceed 3,200. When there are more than 3,200 insulators, they shall be divided into batches of 1,200 to 3,200 insulators each, and tested and assessed separately.
6.3 The inspection of insulators is divided into individual tests, sampling tests and type tests. In addition to complying with the provisions of this standard, the test methods shall also comply with the provisions of GB775.1~755.3, GB5958 and JB/Z262. 6.3.1 Individual tests: Insulators shall be inspected one by one according to the provisions of Table 3. If any of the requirements specified in Table 3 are found to be not met, the insulator shall be unqualified.
Table 3 Test items for insulators one by one
Test name
Appearance inspection
Ultrasonic inspection
Four-way bending withstand load test
Test basis
Articles 5.2, 5.4, 5.5, 5.8, 5.11 of this standard Article 5.6 of this standard
Article 5.9 of this standard
Test method
JB/Z262
6.3.2 Sampling test: The sampling test shall be carried out by randomly selecting specimens according to the number of specimens specified in Table 4 after each test is passed, and the test shall be carried out according to the procedures in Table 4.
The insulator bending failure load test in the sampling test items adopts the metrological secondary sampling plan, and the size inspection, temperature cycle test and porosity test adopt the piece-count secondary sampling plan. The acceptance quality level (AQL) is 2.5%, and the determination constant, determination criteria and determination procedure are in accordance with the provisions of GB3384. The zinc layer test, inspection rules and determination criteria are in accordance with the provisions of GB5958. 8
Test name
Dimension inspection
Zinc layer test
Temperature cycle test
Insulator bending and breaking load test
Hole gland test
JB/T8509-1996
Table 4 Insulator sampling test items
Number of test batches (pieces)
Test basis
Articles 4.2, 5.4, 5.5, 5.10, 5.11 of this standard Article 5.8 of this standard
Article 5.7 of this standard
Article 5.1 of this standard
Article 5.3 of this standard
N≤1200
12007 Articles
Article 5.1 of this standard
Article 5.3 of this standard
N≤1200
12007 Articles
Article 5.1 of this standard
Article 5.3 of this standard
N≤1200
1200
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