JB/T 10305-2001 Technical requirements for organic material post insulators for 3.6kV~40.5kV high voltage equipment users
Some standard content:
ICS29.080.10
Machinery Industry Standard of the People's Republic of China
JB/T103052001
neqIEc60660:1999
2001-08-30Tea
Wa Xian Ji Dong
2002-02-01Small Cable
JB/T103052001
Foreword·
Scope·
Cited Standards
Conditions of Use
Definition·
Technical Requirements·
Test Classification and Test Items…|| tt||Test methods ·
Packaging, marking, recording and storage ·
Verification of geometric tolerances
Record A (suggestive appendix)
Minimum height of indoor organic material pillar insulation ·Appendix (suggestive appendix)
Appendix C (suggestive record) Raw material standards and factory test items for insulating parts Date ·, 8
JB/T103052001
This standard is not equivalent to TEC60660:1999 "Insulators - Test of indoor organic material pillar insulators for systems with nominal voltages higher than 1090V and lower than 300kV". This standard is a product standard. In addition to test regulations, it also includes technical requirements, marking, packaging and requirements for raw materials.
This standard was first formulated in August 2001.
The appendix, Appendix B and Appendix C of this standard are all suggestive appendices. This standard is proposed and managed by the National Technical Committee for Standardization of Insulators. The drafting units of this standard are Xi'an Electric Ceramics Research Institute and Xi'an High Voltage Electric Appliance Research Institute. The main drafters of this standard are Li Da, Su Yufu, Liu Jingbo and Yang Jianhu. This standard is interpreted by the National Technical Committee for Standardization of Insulators.
Jia Kui Lu Wa Yi
3.6kV40.5kV
JB/T103052001
neqIEC60660:1999
This standard specifies the scope of application, definition, use conditions, technical requirements, inspection rules and test methods, acceptance criteria and general requirements for packaging, marking and storage of organic material post insulators. This standard applies to indoor organic material post insulators used under atmospheric conditions on AC electrical devices or equipment with rated voltages of 3.6kV to 40.5kV and frequencies not exceeding 100Hz. This standard does not include composite insulators. Note:
1. The organic material post insulator type high voltage live display device, used as indoor post insulator, shall meet the requirements of the standard. 2. Indoor organic material post insulators used on high voltage equipment above 40.5kV can refer to this standard. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When the standard is published: the versions shown are valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB 156-1993 Standard voltage (neqIEC 600:38:198:) GB191-2000 Pictorial symbols for packaging, storage and transportation
GB/T775.1-1987 Test methods for insulators Part 1: General test methods GB/T2900.8-1995 Electrical terminology for insulation (egvIEC 60050--471:1984) GB3906-1991 3kV~35kV AC metal-enclosed switchgear (nenIEC60298:1990) GB/T6553-1986 Test methods for evaluating the resistance to tracking and electrical erosion of electrical insulating materials used under severe environmental conditions (eqvIEC 60587: 1984)
Partial discharge measurement (e[60270:1981) GB/T7354-1987
GH8287.1--1988 High-voltage post porcelain insulators Part 1: Technical conditions (neQIEC60168:1994) GB/T11020--1989 Test method for determining the combustion performance of solid electrical insulating materials after exposure to an ignition source (eqVIEC607071981)
GB/T11022-1999 Standard for high-voltage switchgear and controlgear Common technical requirements (eqvIEC60694:1996) GB/16927.1-1997 High voltage technology - Part -: - Test requirements (eqvIEC60060-1:1989) 3 Conditions of use
3.1 Normal conditions of use Same as 2.1.1 of GB/T11022 2001-08-30
2002-02-01 Small lock
JB/T103052001
3.2 Condensation and pollution conditions Same as Appendix E of GB3906. 4 Definitions
Except for the following definitions, the terms used in the standard shall comply with GB/T2900.84.1 Organic material post insulators
Post insulators are used to provide rigid support for a live part and insulate the part from the ground or another live part. The whole or part of the organic material post insulator is composed of organic materials, that is, carbon compounds or carbon and silicon compounds. These organic materials can be used alone or in combination with other materials (minerals or organic matter) as fillers and reinforcing agents.
4.2 Indoor support insulators
Indoor support insulators are designed to be used without being exposed to outdoor atmospheric conditions. They are divided into standard support insulators for indoor use under normal use conditions (according to 2.1.1 of GB/T11022) and a type of support insulator for indoor use under condensation and pollution conditions (according to Appendix E of GB3906). 4.3 Structural type
Organic material post insulators are divided into two types according to their structure. Type A
The shortest breakdown distance through solid insulation is at least equal to half of the shortest breakdown distance through the outside air of the insulation (epoxy resin material The shortest breakdown distance through the solid insulating material is less than one-third (for resin insulation) or one-half (for other organic material insulators) of the shortest dry arc distance through the air outside the insulator. 4.4 Batch A group of post insulators provided for acceptance, they should have the same structure, the same material, and be manufactured under the same production conditions! Production. One or more batches can be provided for acceptance at the same time, and the batch submitted can be all or part of the quantity of one batch. 4.5 Flashover A destructive discharge on the external surface of the insulation, causing a connection between two accessories that are normally connected to a running voltage. The term "flashover" used in this standard includes flashovers across the surface of an insulator, including sparks in the air near the insulation. 4.6 Flashover
A destructive discharge through the insulating material of the insulator body, which will cause a permanent loss of dielectric strength. Fragmentation of the umbrella edge or damage to the insulator due to surface discharge and heating should not be considered as low flashover. 4.7 Lightning impulse dry withstand voltage
The lightning impulse voltage that a dry post insulator can withstand under specified test conditions. 4.850% lightning impulse dry flashover voltage
Under the specified test conditions, the lightning impulse voltage value with only 50% flashover probability for dry state support insulators 4.9 Power frequency dry withstand voltage
Under the specified test conditions, the power frequency voltage that dry state support insulators can withstand. 2
4.10 Power frequency flashover voltage
JB/T103052001
Under the specified test conditions, the arithmetic mean of the voltage measured when flashover occurs under dry state support insulation. 4.11
Mechanical damage load
Under the specified test conditions, the maximum load that can be reached when testing organic material support insulators. 4. 12 Creepage distance
The shortest distance between two parts along the outer surface contour of the insulating part of the support insulator is usually the creepage distance of the post insulator. However, considering that the post insulator is equipped with metal accessories, the distance involved in the metal accessories under working conditions should not be included in the creepage distance:
1 If the high-resistance coating covers part of the insulating part on the post insulator, such a coating should be considered as an effective creepage surface, and the distance between this surface should be included in the creepage distance.
2. The surface resistivity of this high-resistance coating is generally about 100, but can be as low as 102. 3. If the entire surface of the post insulator is covered with a high-resistance coating (i.e., stabilized insulator), the surface resistivity and creepage distance issues should be agreed upon by the manufacturer and the purchaser.
4.13 Specified characteristics
Specified characteristics are:
It can be any other value specified in the voltage value or mechanical load value standard; it can also be the value of any other characteristic agreed upon by the manufacturer and the purchaser. The specified withstand and flashover voltages refer to standard atmospheric conditions. 4.14 End face parallelism
The maximum difference in the height of the post insulator measured between the surfaces of the metal accessories at both ends. 4.15 Concentricity
The displacement of the vertical three-post insulation axis between the centers of the top and bottom metal accessories installation centers. 4.16 Angular deviation of fastening holes
The rotational offset of the corresponding installation holes of the top and bottom metal accessories of the post insulator expressed in angle. 5 Technical requirements
5.1 Requirements for raw materials of insulating parts
Organic material post insulators are mainly divided into epoxy resin insulation and unsaturated polyester glass fiber reinforced molding compound insulators. Note: When selecting non-ring micro-resin materials to manufacture post insulators, the experience of the leakage test conducted by Chengji GB6553 proves that the raw materials directly affect the quality of the insulator. The raw materials of the insulating parts shall meet the requirements of relevant standards and technical regulations. There should be an inspection report when the raw materials enter the factory: the post insulator and the manufacturer shall conduct necessary factory inspections on the raw materials. Note: Appendix C lists the standards of the main raw materials of the insulating parts used recently, as well as the items that the post insulator manufacturer shall conduct necessary inspections on the raw materials according to the listed standards. The use of other types of raw materials shall refer to the corresponding standards. 5.2 Dimensional requirements for post insulators
The dimensional characteristics are as follows:
-Height:
-Maximum nominal diameter of the insulating part:
-Insulating structure:
-Tolerance:
-Creep distance.
JB/T103052001
The dimensions of the post insulator shall meet the requirements of the relevant drawings. Special attention should be paid to the dimensions that affect interchangeability. Note: This standard does not involve the specific dimensions of insulators, but as a guide, Appendix B gives the maximum center height of insulators. Unless otherwise agreed by the supply and demand parties, the allowable deviation of the dimension without special tolerance is: ± (0.01 + 0.2) mm
Hd is the dimension to be checked: in nm
Unless specified in the drawing or otherwise agreed, the installation structure of the post insulator, concentricity (the maximum deviation between the center circle axis of the upper and lower mounting holes), angle deviation of the drawing hole (the deviation of the angle of the upper and lower mounting holes), axis straightness and creepage distance deviation shall comply with the provisions of GB8287.1, while the height deviation and end face parallelism shall comply with Class I specified in GB 8287.1. 5.3 Appearance
The installation of metal accessories on insulating parts shall comply with the drawing column. The color of the post insulator should be close to the color specified in the drawing. The surface of the epoxy resin insulator should be bright, smooth, and should not have defects such as missing materials, pores, cracks, creases, etc. The surface of the insulator (except the mold seam) is not allowed to be polished, doubled, repaired, or painted. However, if the purchaser or the design drawing requires painting, the outer surface is allowed to be painted with an insulating paint with three-proof properties. The paint film is required to be bright, uniform in color, without spots and flow marks, and the depth of the topcoat color should be consistent for each batch. The surface of the unsaturated polyester glass fiber reinforced molding compound insulator should be flat and bright, and should not have pores, fuzzing, cracking, missing materials, and 1 dew. The surface of the insulator (except the mold seam) is not allowed to be ground or processed, and no paint is allowed. Note: The appearance of insulators made of other materials can refer to the requirements for epoxy resin or unsaturated polyaldehyde glass fiber reinforced molding compound insulators. Any surface defects that may damage good operating performance are not allowed. 5.4 Rated voltage and withstand voltage of support insulators The rated voltage and rated withstand voltage of indoor organic material support insulators are shown in Table 1. 1
Rated voltage
1 min Three-frequency withstand voltage
(k, effective value)
1. The rated voltage value of the support insulator is selected according to the highest voltage value of the equipment specified in GB156. 2. For the case where the altitude is higher than 1000m, the requirements of 2.2.15.5 of GB/T11022 for partial discharge and partial discharge extinguishing voltage of support insulators a. The partial discharge of support insulators shall not exceed the value specified in Table 2. 4
Lightning impulse withstand voltage
(kv, peak value)
Applied voltage (k)
JB/T103052001
b. The partial discharge extinguishing voltage shall be 1.1U sequence, 5.6 The person who needs to be charged shall be charged!
Allowable partial discharge (pC)
Type B post insulators shall withstand 1.3 times the lightning surge voltage specified in Table 1 without breakdown. 5.7 Water absorption test
Post insulators shall be subjected to water absorption test. Note: To provide data for this test, the power frequency flashover voltage value of the post insulator needs to be measured. 5.8 Flammability test
In order to check the burning and white-out characteristics of the insulating material, the flammability test shall be carried out on the material sample of the same material as the insulator. 5.9 Temperature cycle test
Post insulators shall be subjected to temperature cycle test without damage: 5.10 Aging and humidity test
Post insulators operating under the use conditions specified in Article 3.2 shall be able to withstand the 1st or 2nd level aging test specified in Appendix E of GB 3906.
5. 11 Mechanical Strength
The mechanical strength grade of the support insulator is specified according to the breaking load of the insulator when the insulation is installed vertically and the load is horizontally applied to the top of the insulator for bending test. Its standard values are as follows:
4000 N.6000N.
16000 N,
25000 N
The load applied during the mechanical breaking load test is 100% of the specified mechanical breaking load value. Each test is usually applied with a load equal to the specified mechanical breaking load in the same direction, or a load of 70% of the specified mechanical load can be applied in one direction, or the breaking load P can be specified to be applied at a position X mm above the top surface of the insulator: h is the height of the insulator.
The value P= P.
Support insulators usually only need to undergo bending strength test. When required, the following tests can be carried out: Tensile test:
Twist test:
A pressure test,
5.12 Deflection measurement under load at normal ambient temperature Apply a bending load to the end of the support insulator, measure the deflection value of the top force point of the support insulator under 20%, 50% and 70% rated bending failure loads, the difference between the deflection values under 50% and 20% rated bending failure loads shall comply with the provisions of Table 3 Table 3
Insulator height
(mm)
200<500
Difference between the deflection values of the support insulator under 50 tons and 20% rated bending failure loads (rmum)
JB/T103052001
When the bending load is released, the residual deflection shall be less than 0.2% of the height of the support insulator. If required, the supply and demand parties shall negotiate the allowable range of the deflection angle under torsional load. 5.13 Determination of mechanical bending strength as a function of temperature Organic material insulation is required to function satisfactorily over a wide range of temperatures. It is therefore necessary to determine the change in mechanical strength due to temperature. For this purpose, only the mechanical bending load test (see 7.4) is used. Two temperature ranges are specified as follows: a) -40°C to +5°C;
b) -20°C to +75°C;
c) -5°C to 190°C
The mechanical bending load test shall be carried out in the temperature range selected by the purchaser. If the purchaser does not select a range, the range b) of 5.13 shall be used. Within the selected temperature range, the temperature-dependent breaking load shall be tested. Three temperature values shall be selected within the range as follows: a) -40°C, 120°C, 155°C:
b) -20°C.+20.+75°C;
c) 5°C, 20°C, 190°C.
For each selected temperature, the bending mechanical breaking load test should be carried out on at least 10 insulators. From the measured actual mechanical breaking load, the mean (R) and standard deviation (S) are calculated: RER
Here P is the breaking load of each test post insulator, K is the number of insulators tested at this selected temperature, E(RR)
By plotting the points corresponding to the temperature and connecting them (R-αs), the probability of reaching the specified breaking load at the selected temperature for an organic material post insulator of a specific structure can be evaluated. "Usually 2, but higher or lower values can be selected according to the required probability level through agreement between the manufacturer and the purchaser. 6 Test classification and test items
The tests are divided into the following three categories:
6.1 Type test
Type test is used to check the main characteristics of organic material post insulators, which mainly depend on its structure, materials used and manufacturing process. Type test is usually carried out on one insulator and one time for a new structure or new manufacturing process. It is repeated only when there is a change in its structural material or manufacturing process. When the change only affects some characteristics, only the tests related to these characteristics need to be repeated. The samples of type test should be tested one by one and sampled (items repeated with type test are not performed) and meet the requirements. Insulators that have undergone type test should not be used for operation. 6.1.1 Insulators shall be subjected to the following type tests, which shall be carried out in sequence: a) electrical impulse withstand voltage test (see 5.4 and 7.3); b) power frequency dry withstand voltage test and T frequency dry flashover voltage test (see 5.4, 5.7 and 7.3); c) temperature cycle test (see 5. and 7.11); d) water absorption test (see 5.7 and 7.8): e) partial discharge extinction voltage test (see 5.5 and 7.3); f) lightning impulse breakdown test (only for type B insulation) (see 5.6 and 7.3); Note: When the purchaser and the manufacturer agree, this test can also be carried out on the support insulation of structural type A, g) normal ambient temperature displacement test under load (see 5.12 and 7.5); h) mechanical damage load test (see 5.11 and 7.4). 6.1.2 The following type tests shall be conducted only once for each type of post insulator of the same material manufactured by the same production method.
- Flammability test (see 5.8 and 7.10). 6.1.3 When organic rod material post insulators are required to operate satisfactorily over a wide temperature range, the following tests shall be conducted. The number of test pieces shall be as specified in 6.13. This test shall be conducted only once for insulators of similar shape and approximately the same size (within ±10% of the size of the test insulator) manufactured by the same production method and the same material. Mechanical bending strength test with temperature variation (see 5.13 and 7.6). 6.1.4 Post insulators operating under condensation and pollution transfer conditions (see 3.2) shall be subjected to the following tests. Aging and aging tests (see 5.10 and 7.9) 6.2 Simulated test
Sampling tests are used to verify the characteristics of insulators that may change due to manufacturing process and material quality. Sampling test As an acceptance test, samples of post insulators shall be randomly selected from the batch that meets the requirements of the individual tests. The number of samples selected for the test shall comply with Table 4. The actual purchaser can select the samples for the test: Table
Number of insulators in this batch
200500
Note: If the calculated number is not an integer, the next integer should be selected. The sampling test shall be carried out in the following order:
a) Dimensional check (see 5.2 and 1)
b) Water absorption test (see 5.7 and 7.8): c) Partial discharge extinction voltage test (see 5.5 and 7.3): (d) Deflection test under load at normal ambient temperature (see 5. 12 and 7.5); e) Mechanical damage load test (see 5.11 and 7.4). Sample Narrow Products
4-1.51/1 000
If only one post insulator fails to meet any of the sampling tests, an additional sample equal to twice the number of samples originally submitted for testing shall be submitted for testing. The repeated test shall include the test that failed and those tests that may have affected the initial test results before this. If two or more post insulators fail to meet any of the specified sampling tests, or any failure of the post insulator occurs during the repeated test specified above, the entire batch shall be immediately returned to the manufacturer for further inspection, and then the batch or part shall be submitted for testing again. JB/T103052001
Three times the number of samples selected for the first time shall be selected for testing. This repeated test shall include the test that failed and those tests that may have affected the initial test results before this. If any failure occurs in the post insulators submitted for testing again, the entire batch shall be considered not to comply with this standard.
Insulators subjected to the sample test shall not be used for operation. 6.3 Individual tests
Individual tests are used to identify defective insulators and are performed during the manufacturing process. Each insulator shall be individually tested. Insulators that have not passed the test shall be rejected.
Support insulators shall be individually tested in accordance with the following procedures: a) Visual inspection (see 5.3 and 7.2):
h) Individual electrical (withstand current at 1m power frequency, long) test and partial discharge measurement and partial discharge extinction test (see 5.4, 5.6 and 7.3).
1. The above test b) can be carried out under the same installation conditions: 2. This standard does not specify individual mechanical tests, but with the consent of the purchaser and the manufacturer, individual mechanical tests can be carried out on type A support insulators with a rated voltage of 40.5kV. The test method is as follows: 7. Individual tests shall be carried out before individual gas testing and individual partial discharge tests. Test methods
7.1 Dimension inspection
7.1.1 Inspection methodbZxz.net
The dimensions of the post insulators shall be inspected in accordance with the method specified in GB/773.1 or Appendix A of this standard. Other appropriate methods may also be used. 7.1.2 Acceptance criteria
If the measured dimensions meet the requirements of 5.2, the post insulators have passed the test. When measuring the creepage distance in the sampling test, if the measured value is greater than the specified value, that is, greater than the positive deviation, the batch can still be accepted as long as the purchaser and the manufacturer agree. 7.2 Appearance inspection
7.2.1 Inspection method
Visually inspect the appearance of the post insulators.
7.2.2 Acceptance criteria
The post insulators should not have any phenomenon that does not meet the requirements of 5.3. 7.3 Electrical test
7.3.1 General requirements and installation arrangement for electrical test7.3.1.1 General requirements for electrical test
a) The test methods for lightning impulse and power frequency voltage shall be in accordance with GB/T16927.1. b) The lightning impulse voltage shall be expressed as its expected peak value. The power frequency voltage shall be expressed as its peak value divided by /2. c) When the natural atmospheric conditions during the test are different from the standard reference atmospheric conditions specified in GB/T16927.1, correction factors shall be adopted in accordance with GB/T16927.[.
d) Before the electrical test begins, the post insulators shall be clean and dry. 8
JB/T103052001
e) Care shall be taken to avoid condensation on the surface of the post insulators, especially when the relative humidity is high. For example, the post insulator shall be placed at the ambient temperature of the test site for a sufficient time to reach thermal equilibrium before the test is started. Unless the manufacturer and purchaser agree, the test shall not be carried out when the relative humidity exceeds 85%.
7.3.1.2 Standard mounting arrangement for electrical tests The post insulator shall be mounted vertically on a horizontal grounded metal support with a grooved surface and flange facing downward. The width of this grounded metal support shall be approximately equal to the point diameter of the test post insulator mounting surface, its length shall be at least equal to twice the height of the post insulator, and it shall be at least 1 m away from the ground.
A cylindrical conductor shall be installed at the tail of the post insulator, with the conductor core twisted in a horizontal plane and perpendicular to the ground support. The length of the conductor shall be at least equal to 1.5 times the height of the post insulator and extend at least 1 m on each side of the insulation axis. The diameter of the conductor shall be approximately 1.5% of the height of the post insulator and a minimum of 25 mm.
The test voltage shall be applied between the conductor and the ground support, and the high voltage connection shall be connected to one end of the conductor. During the test, no object other than that described in this clause shall come within 1 m of the post insulation or 1.5 times the height of the post blade, whichever is greater. Post insulators shall be complete with accessories which are necessary for the post insulator and which are specified by the manufacturer. Standard mounting arrangements are not applicable to partial discharge tests or ageing and humidity tests. For these tests, the mounting arrangements shall be agreed between the purchaser and the manufacturer.
7.3.1.3 The extent to which the mounting arrangements for electrical tests simulating service conditions simulate service conditions shall be agreed between the manufacturer and the purchaser. All factors which may affect the characteristics of the post insulator shall be considered and service conditions shall be simulated as closely as possible.
NOTE: Under these non-standard conditions, the characteristics may differ from those measured under the standard mounting method. This difference shall be taken into account when involving post insulators with a reduced height above the ground.
7.3.2 Lightning impulse withstand voltage tests
Post insulators shall be tested in accordance with the provisions of 7.3.1. The impulse generator should be adjusted to produce a 1.2/50 of the test voltage. Both positive and negative impulses should be used. If it is demonstrated that testing with one polarity gives a lower result, testing with that polarity only is permitted.
After an impulse test, some insulating materials may retain some charge. When the polarity is reversed, care should be taken to discharge the insulating material using a suitable method. For example, applying three impulses of opposite polarity with a minimum of % of the test voltage before the test is a recommended method.
Two test procedures are commonly used for lightning impulse withstand voltage tests: - 50% flashover voltage procedure:
- 15 impulse withstand voltage procedure.
Note: The 50% flashover voltage procedure gives more information. 7.3.2.1 Withstand voltage test using 50% flashover voltage procedure 7.3.2.1.1 Test procedure
50% lightning impulse voltage shall be calibrated according to the correction factor specified in GB/T16927.1: The specified lightning impulse withstand voltage is tested by the 0.5% lightning impulse flashover voltage determined by the rise-fall method described in GB/T116927.1. 7.3.2.1.2 Acceptance criteria
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