JB/T 10441.2-2004 Corrugated insulating paper for electrical use Part 2: Test methods
Some standard content:
1CS29.035.99
Machinery Industry Standard of the People's Republic of China
JB/T10441.2—2004
Crepe insulating paper for electrical purposes Part 2: Methods of test
(IEC60554-2:1977, MOD)
Published on March 12, 2004
Implemented on August 1, 2004
Published by the National Development and Reform Commission of the People's Republic of ChinaForeword
Normative references
Test description.…
Appearance,
Thickness,
Number of wrinkles
Longitudinal extensionStretch index and elongation at breakOil absorption height
Conductivity of water extract
pH value of water extract,
Electrical strength
Transformer oil Pollution
JB/T10441.2—2004
JB/T1044】(Corrugated insulating paper for electrical use) is divided into three parts: Part 1: Definitions and general requirements: Part 2: Test methods: Part 3: Technical requirements.
This part is the second part of JB/T10441. JB/T10441.2—2004
This part is modified to adopt IEC60554-2 "Specification for fiber paper for electrical use Part 2: Test methods" (English version of 1977). The relevant technical differences have been compiled into the text and are included in the text where they are involved. The margins of clauses are marked with a single vertical line. The main differences between this part and IEC60554-2 are as follows: The foreword of IEC60554-2 has been deleted, and the content of the standard structure in its introduction has been incorporated into the foreword of this part: A chapter on "Normative Reference Documents" has been added: The test methods for friction, quantitative, elongation, moisture, ash content, conductivity and pH value of water extracts, and electrical strength have been retained, and the tensile strength has been changed to the extension tensile index: The test methods for transformer oil contamination and oil absorption height have been added. This part was proposed by the China Machinery Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Insulating Materials, and some drafting units are: Guilin Electric Science The main drafters of this part of the Institute are Li Bingsong and Jian Xuemei. This part is formulated for the first time
Corrugated insulation paper for electrical use
Part 2: Test methods
This part of JB/T10441 specifies the test methods for corrugated insulation paper for electrical use. This part applies to corrugated insulation paper for electrical use. 2 Normative references
JB/T10441.2—2004
The clauses in the following documents become the clauses of this part through reference in this part of JB10441. All subsequent amendments (excluding errata) or revisions of dated references are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated references, the latest versions apply to this part. GB/T461.1-2002 Determination of capillary absorption height of paper and paperboard (Krem method) (eqvISO8787:1989 (199] confirmed)) GB/1408.1-1999 Test method for electrical strength of solid insulating materials Test under power frequency (egvIEC60243-1:1988) GB/T1545.2-1989 Determination of pH value of aqueous extract of paper, paperboard and pulp (eqvISO6588:198) GB2536-1990 Transformer oil (negEC60 296:1982) GB/T5654-1985 Measurement of power frequency relative dielectric constant, dielectric loss factor and volume resistivity of liquid insulating materials (negIEC60247:1978)
GB/T7196-1987 Test method for determination of ionic impurities in electrical insulating materials by liquid extraction (eqvIEC60589:1977) 3 Test description
Electrical crepe insulating paper products are roll paper, and the sample is a section of the roll paper. When sampling, there should be no stretching effect on it. Unless otherwise specified, the sample should be normalized for 16 hours in an environment of 23℃±2℃ and relative humidity of 50%±5%. In case of dispute, the normalization treatment should be to dry the sample at 70℃±2℃ to less than 4% moisture, and then transfer it to an environment of 23℃±1℃ and relative humidity of 50%±2℃ for 16 hours.
4 Appearance
Inspect by visual inspection under soft, diffuse light. 5 Thickness
5.1 Instrument
Constant pressure thickness gauge: The diameter of the measuring surface of the upper measuring head is 16.0mm±0.5mm, and the lower measuring head should be larger than this value, so that the pressure measuring area during measurement is 200mm: The pressure applied to the sample is 100kPa±10kPa. The division value of the measuring dial is 0.001mm, and the allowable estimated value of the reading is 0.0005mm. When calibrated with a calibrated gauge block, the measurement accuracy should be within 0.0005mm. 5.2 Measurement of the thickness of a single layer of material
Cut a sample with a full width and a length of 50mm in the longitudinal direction, and measure nine points evenly spaced from about 20mm away from the edge along the width. Take the median of the nine measured values as the result, and report the maximum and minimum values. The unit of 6 wrinkle number is mm. Cut a sample of 100 mm in length and 50 mm in width longitudinally at 1/3 and 2/3 of the width of the paper roll. Place the sample on a flat plate without any stretching or compression. Place a straight ruler longitudinally on the sample. Let the light shine obliquely on the paper surface through the ruler so that a deep shadow is cast. Use a 4x magnifying glass to magnify the sample. Mirror, carefully count the number of main wrinkles in the total width of the sample of 50mm, then take another sample and repeat the test twice. The sum of the two measured numbers is divided by 10. The number of wrinkles is expressed as pieces/10mm. 7 Quantification
7.1 Instruments and tools
Analytical balance: Sensitivity is 0.001g:
Steel ruler: Graduation value is 0.5mm:
Sampling metal plate: 100mm×100mm.
7.2 Samples
Use the sampling plate to cut three samples of 100mm×100mm evenly at least 20mm away from the edge along the width, and perform normalization.
7.3 Test procedure
7.3.1 Weigh the weight of each sample. Accurate to 0.001g: and use a steel ruler to measure the length and width of the sample, accurate to 0.5mm. 7.3.2 Quantitative value is calculated according to formula (1):
G=mx100
Where:
G is the quantitative value of the sample, in g/m
is the weight value of the sample, in g:
is the area value of a sample, in mm2. 7.4 Results
The median of the test values of three samples is taken as the result, and the maximum and minimum values are reported. 8 Longitudinal extension tensile index and elongation at break 8.1 Equipment
(1)
The constant speed mobile testing machine has a speed adjustment that allows the sample to break within 20s ± 5s. It has a device for measuring and recording tensile force and elongation, and the graduation value can read 10% of the value required by the single material specification. 8.2 Samples
8.2.1 Sample size and quantity
The sample length should be such that the distance between the two clamps of the testing machine is an appropriate length. The width can be 15mm, 25mm or 50mm, with an allowable deviation of -0.1mm to +0.2mm. The number is nine in each direction. 8.2.2 Sampling method
Longitudinal specimens should be sampled evenly along the width of the web at a distance of more than 20mm from the edge of the web. Transverse specimens should also not be sampled at the same virtual latitude. 8.3 Test procedure
Fix the specimen in the fixture. Keep the distance between the fixtures at 200mm. Select the test speed and conduct the test, recording the tensile force (F) and elongation (AL) when the specimen breaks. The specimen must break within 20s±5s, otherwise the test speed should be adjusted. If the specimen breaks in or at the chuck, the result is invalid and resampling is required. The tensile strength is calculated according to formula (2):
Wu Zhong:
7. A—Numerical value of tensile strength of the sample, unit is kN/m: 2
F—Numerical value of the maximum tensile force that the sample can withstand, unit is N: b—Numerical value of the width of the sample, unit is mme—Elongation is calculated according to formula (3):
Where:
E—Numerical value of elongation when the sample breaks, %: AL—Numerical value of the length increase when the sample breaks, unit is mm: L—Numerical value of the initial distance between the sample and the fixture, unit is mm. Test quantitatively according to Chapter 7.
Longitudinal extension tensile index is calculated according to formula (4): 8.5
Wherein:
y—value of the elongation index, in Nm/g: T, value of the tensile strength tested, in kN/m: G—value of the quantitative median tested, in g/m2: E——value of the elongation at break tested, %. 8.6 Results
JB/T10441.2—2004
8.6.1 The longitudinal elongation index is the median of the values tested nine times, and the maximum and minimum values are reported. 8.6.2 The elongation is the median of the values tested nine times, and the maximum and minimum values are reported. 9·Oil absorption height
According to GB/461.1. And the following provisions are made: Transformer oil: in accordance with GB2536 requirements:
Sampling: Take five specimens with a length of 250mm and a width of 15mm±0.5mm in each longitudinal and transverse directions. The longitudinal specimens shall be cut evenly along the entire width. The transverse specimens shall not be cut on the same virtual latitude. Results: The median of the test values of the five specimens shall be taken as the result of the oil absorption height and the maximum and minimum values shall be reported. 10 Moisture
10.1 Instruments and equipment
Analytical balance: Sensitivity 0.001g:
Oven: Temperature control accuracy ±2℃:
Sample container: Erlenmeyer flask with lid.
10.2 Sample
Three samples of 50g each shall be cut evenly along the width of the paper roll at least 20mm from the edge. 10.3 Test procedure
10.3.1 Wash and dry the sample container together with the lid, take it out and put it in a desiccator to cool to room temperature, then weigh it (mz), quickly put the sample into the container, seal it and weigh it again (m3). 10.3.2 Place the container containing the sample in an oven at 105℃±2℃. Open the lid (if necessary, take the sample out of the container and spread it in the oven). After 8 hours, cover the lid, take it out and put it in a desiccator to cool to room temperature, and weigh it (m4). In case of dispute, the operation can be repeated until it is cautious, that is, the difference between two consecutive measurements is not more than 0.1%. 10.3.3 The moisture content is calculated according to formula (5):
JB/T10441.2--2004
Where:
--the value of the moisture content of the sample, %:
M=\-\×100%
the value of the weight of the sample container, in g: the value of the weight of the sample container plus the sample before baking, in g: the value of the weight of the sample container plus the sample after baking, in g. mu
10.4 Take the median of the three test values as the moisture result, and report the maximum and minimum values, accurate to 0.1%. 11 Ash content
11.1 Instruments and equipment
Balance: Sensitivity 0.0001g:
High temperature furnace: Temperature control accuracy ±25℃:
11.2 Sample
As specified in 7.2, cut three samples of about 2g~5g, and remove the moisture according to the baking conditions for measuring moisture. You can also use 2g of dry samples that have not been damp after measuring moisture.
11.3 Test procedure
Pre-burn at 925℃±25℃, take out and put in a desiccator. And weigh after cooling to room temperature (ms), and then add the dried and exploded sample to weigh (m). Burn to carbonize. Then move it into a high temperature furnace and burn it at 925℃±25℃ until there is no black carbon. Take it out, cool it in a dryer and weigh it (mz). If necessary, repeat the burning until constant weight. All measurements should be accurate to 0.000lg. Ash content is calculated according to formula (6):
As=7-msx100%
Where:
A—the value of the ash content of the sample, %:
-the value of the weight, in g:
-the value of the weight of the sample in the crucible before burning, in g: the value of the weight of the sample in the crucible after burning, in g. 11.4 Results
The median of the three tests is taken as the ash content result, and the maximum and minimum values are reported, accurate to 0.1%. 12 Conductivity of water extract
According to 4.1 of GB/T7196-1987.
The median of the three tests shall be taken as the result of the conductivity of the water extract, and the maximum and minimum values shall be reported. 13 pH of water extract
13.1 Instrument
pH value measuring instrument: the accuracy of which can be read is 0.1 unit. 13.2 Preparation of water extract
Same as Chapter 9.
13.3 Determination of pH value
Perform according to 7.2 of GB/T1545.2-1989: the accuracy shall be 0.01(6)
JB/T10441.2-2004
13.4 Result
The median of the three test values shall be taken as the result of the pH of the water extract, and the maximum and minimum values shall be reported, the accuracy shall be 0.1 unit. 14 Electric Strength
Electrical strength is carried out in accordance with GB/T1408.1-1999, and the following provisions are made: a) The electrode is 25mm/75mm, and the boost is a continuous boost mode; b) For the test in air, the sample should be dried at 105℃±2℃ for 2h and then tested at room temperature. During the operation, it should be ensured that the sample does not absorb moisture again and significantly affect the test results.
c) For the test in oil, the sample should be dried at 105℃±2℃ for 2h, then taken out and placed in transformer oil preheated to 90℃, and tested in oil after cooling to room temperature.
d) The median value of the nine test values is taken as the result, and the maximum and minimum values are reported. 15 Contamination of transformer oil
15.1 Equipment and instruments
The test cell for determining the liquid dielectric loss factor or volume resistivity meets the requirements of GB/T5654. Container for sample preparation: A clean three-mouth container suitable for accommodating 75cm sample and 750mL insulating liquid, and convenient for measuring temperature and passing nitrogen flow.
Heating device: Temperature control accuracy ±2℃.
Nitrogen: High-pressure bottled
Transformer oil: Meet the requirements of GB2356.
15.2 Sample preparation
Cut the normalized sample into small pieces with a surface area of less than 1cm2, a total of 75cm2 sample, put it in a container, and fill it with 750mL transformer oil. Fill another container with 750mL of the same transformer oil. Then slowly pass nitrogen flow into the container to drive out the air in the container and keep the container in a nitrogen atmosphere. After heating to 100℃±2℃ and keeping it for 96h, cool it to 70℃±2℃ and cut off the nitrogen flow. Transfer the transformer oil to the liquid dielectric loss factor test cell that has been preheated to 70℃±2℃. 15.3 According to the provisions of GB/T5654, the dielectric loss factors of the two transformer oils were tested at 70℃±2℃. 15.4 Results
The increase in the dielectric loss factor of the test oil to the blank oil was taken as the contamination of the transformer oil. People's Republic of China
Mechanical Industry Standard
Electrical Corrugated Insulating Paper
Part 2: Test Method
JB/T10441.2—2004
Published and distributed by Machinery Industry Press
No. 22, Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm
1/16·0.75 Printing Sheet· 15,000 words
1st edition, 1st printing, August 2004
Book number: 151117352
Website: http://cmpbook.comEditorial office phone: (010) 88379779
Direct sales center phone:
(010 88379693
All books without anti-counterfeiting labels on the cover are pirated
Copyright reserved
Infringements will be prosecuted001g:
Oven: Temperature control accuracy ±2℃:
Sample container: Erlenmeyer flask with lid.
10.2 Samples
Take three samples of 50g each at intervals at least 20mm from the edge of the paper roll width. 10.3 Test procedure
10.3.1 Wash and dry the sample container and the lid, take it out and put it in a desiccator to cool to room temperature, then weigh it (mz), quickly put the sample into the container, seal it and weigh it again (m3). 10.3.2 Put the container with the sample into an oven at 105℃±2℃. Open the lid (if necessary, you can also take the sample out of the container and spread it in the oven). After 8h, cover the lid, take it out and put it in a desiccator to cool to room temperature, and weigh it (m4). In case of dispute, the operation can be repeated until it is determined that the difference between two consecutive measurements is not greater than 0.1%. 10.3.3 The moisture content is calculated according to formula (5):
JB/T10441.2--2004
Wherein:
The value of the moisture content of a sample, %:
M=\-\×100%
The value of the weight of the sample container, in g: The value of the weight of the sample container plus the sample before baking, in g: The value of the weight of the sample container plus the sample after baking, in g. mu
10.4 The median of the three test values is taken as the moisture result, and the maximum and minimum values are reported, accurate to 0.1%. 11 Ash content
11.1 Instruments and equipment
Balance: Sensitivity 0.0001g:
High temperature furnace: Temperature control accuracy ±25℃:
11.2 Sample
As specified in 7.2, three samples of about 2g~5g are cut and the moisture is removed according to the baking conditions for measuring moisture. It is also possible to use 2g of dry samples that have not been dampened after the moisture measurement.
11.3 Test procedure
Pre-burn at 925℃±25℃, take out and put in a desiccator. And weigh after cooling to room temperature (ms), then add the dried and exploded sample and weigh (m). Burn to carbonize. Then move it into a high temperature furnace and burn at 925℃±25℃ until there is no black carbon, take it out, cool it in a desiccator and weigh it (mz). If necessary, the burning can be repeated until constant weight. All measurements should be accurate to 0.000lg. The ash content is calculated according to formula (6):
As=7-msx100%
Wherein:
A—the value of the ash content of the sample, %:
—the value of the weight, in g:
—the value of the weight of the sample in the crucible before calcination, in g: the value of the weight of the sample in the crucible after calcination, in g. 11.4 Results
The median of the three tests is taken as the ash content result, and the maximum and minimum values are reported, accurate to 0.1%. 12 Conductivity of water extract
Carry out according to 4.1 of GB/T7196-1987.
The median of the three tests is taken as the result of the conductivity of water extract, and the maximum and minimum values are reported. 13 pH value of water extract
13.1 Instrument
pH value measuring instrument: with an accuracy of 0.1 unit. 13.2 Preparation of water extract
Same as Chapter 9.
13.3 Determination of pH value
According to 7.2 of GB/T1545.2-1989: with an accuracy of 0.01(6)
JB/T10441.2-2004
13.4 Result
Take the median of the three test values as the result of pH of water extract, and report the maximum and minimum values, with an accuracy of 0.1 unit. 14 Electric Strength
Electrical strength is carried out in accordance with GB/T1408.1-1999, and the following provisions are made: a) The electrode is 25mm/75mm, and the boost is a continuous boost mode; b) For the test in air, the sample should be dried at 105℃±2℃ for 2h and then tested at room temperature. During the operation, it should be ensured that the sample does not absorb moisture again and significantly affect the test results.
c) For the test in oil, the sample should be dried at 105℃±2℃ for 2h, then taken out and placed in transformer oil preheated to 90℃, and tested in oil after cooling to room temperature.
d) The median value of the nine test values is taken as the result, and the maximum and minimum values are reported. 15 Contamination of transformer oil
15.1 Equipment and instruments
The test cell for determining the liquid dielectric loss factor or volume resistivity meets the requirements of GB/T5654. Container for sample preparation: A clean three-mouth container suitable for accommodating 75cm sample and 750mL insulating liquid, and convenient for measuring temperature and passing nitrogen flow.
Heating device: Temperature control accuracy ±2℃.
Nitrogen: High-pressure bottled
Transformer oil: Meet the requirements of GB2356.
15.2 Sample preparation
Cut the normalized sample into small pieces with a surface area of less than 1cm2, a total of 75cm2 sample, put it in a container, and fill it with 750mL transformer oil. Fill another container with 750mL of the same transformer oil. Then slowly pass nitrogen flow into the container to drive out the air in the container and keep the container in a nitrogen atmosphere. After heating to 100℃±2℃ and keeping it for 96h, cool it to 70℃±2℃ and cut off the nitrogen flow. Transfer the transformer oil to the liquid dielectric loss factor test cell that has been preheated to 70℃±2℃. 15.3 According to the provisions of GB/T5654, the dielectric loss factors of the two transformer oils were tested at 70℃±2℃. 15.4 Results
The increase in the dielectric loss factor of the test oil to the blank oil was taken as the contamination of the transformer oil. People's Republic of China
Mechanical Industry Standard
Electrical Corrugated Insulating Paper
Part 2: Test Method
JB/T10441.2—2004
Published and distributed by Machinery Industry Press
No. 22, Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm
1/16·0.75 Printing Sheet· 15,000 words
1st edition, 1st printing, August 2004
Book number: 151117352
Website: http://cmpbook.comEditorial office phone: (010) 88379779
Direct sales center phone:
(010 88379693
All books without anti-counterfeiting labels on the cover are pirated
Copyright reserved
Infringements will be prosecuted001g:
Oven: Temperature control accuracy ±2℃:
Sample container: Erlenmeyer flask with lid.
10.2 Samples
Take three samples of 50g each at intervals at least 20mm from the edge of the paper roll width. 10.3 Test procedure
10.3.1 Wash and dry the sample container and the lid, take it out and put it in a desiccator to cool to room temperature, then weigh it (mz), quickly put the sample into the container, seal it and weigh it again (m3). 10.3.2 Put the container with the sample into an oven at 105℃±2℃. Open the lid (if necessary, you can also take the sample out of the container and spread it in the oven). After 8h, cover the lid, take it out and put it in a desiccator to cool to room temperature, and weigh it (m4). In case of dispute, the operation can be repeated until it is determined that the difference between two consecutive measurements is not greater than 0.1%. 10.3.3 The moisture content is calculated according to formula (5):
JB/T10441.2--2004
Wherein:
The value of the moisture content of a sample, %:
M=\-\×100%
The value of the weight of the sample container, in g: The value of the weight of the sample container plus the sample before baking, in g: The value of the weight of the sample container plus the sample after baking, in g. mu
10.4 The median of the three test values is taken as the moisture result, and the maximum and minimum values are reported, accurate to 0.1%. 11 Ash content
11.1 Instruments and equipment
Balance: Sensitivity 0.0001g:
High temperature furnace: Temperature control accuracy ±25℃:
11.2 Sample
As specified in 7.2, three samples of about 2g~5g are cut and the moisture is removed according to the baking conditions for measuring moisture. It is also possible to use 2g of dry samples that have not been dampened after the moisture measurement.
11.3 Test procedure
Pre-burn at 925℃±25℃, take out and put in a desiccator. And weigh after cooling to room temperature (ms), then add the dried and exploded sample and weigh (m). Burn to carbonize. Then move it into a high temperature furnace and burn at 925℃±25℃ until there is no black carbon, take it out, cool it in a desiccator and weigh it (mz). If necessary, the burning can be repeated until constant weight. All measurements should be accurate to 0.000lg. The ash content is calculated according to formula (6):
As=7-msx100%
Wherein:
A—the value of the ash content of the sample, %:
—the value of the weight, in g:
—the value of the weight of the sample in the crucible before calcination, in g: the value of the weight of the sample in the crucible after calcination, in g. 11.4 Results
The median of the three tests is taken as the ash content result, and the maximum and minimum values are reported, accurate to 0.1%. 12 Conductivity of water extract
Carry out according to 4.1 of GB/T7196-1987.
The median of the three tests is taken as the result of the conductivity of water extract, and the maximum and minimum values are reported. 13 pH value of water extract
13.1 Instrument
pH value measuring instrument: with an accuracy of 0.1 unit. 13.2 Preparation of water extract
Same as Chapter 9.
13.3 Determination of pH value
According to 7.2 of GB/T1545.2-1989: with an accuracy of 0.01(6)
JB/T10441.2-2004
13.4 Result
Take the median of the three test values as the result of pH of water extract, and report the maximum and minimum values, with an accuracy of 0.1 unit. 14 Electric Strength
Electrical strength is carried out in accordance with GB/T1408.1-1999, and the following provisions are made: a) The electrode is 25mm/75mm, and the boost is a continuous boost mode; b) For the test in air, the sample should be dried at 105℃±2℃ for 2h and then tested at room temperature. During the operation, it should be ensured that the sample does not absorb moisture again and significantly affect the test results.
c) For the test in oil, the sample should be dried at 105℃±2℃ for 2h, then taken out and placed in transformer oil preheated to 90℃, and tested in oil after cooling to room temperature.
d) The median value of the nine test values is taken as the result, and the maximum and minimum values are reported. 15 Contamination of transformer oil
15.1 Equipment and instruments
The test cell for determining the liquid dielectric loss factor or volume resistivity meets the requirements of GB/T5654. Container for sample preparation: A clean three-mouth container suitable for accommodating 75cm sample and 750mL insulating liquid, and convenient for measuring temperature and passing nitrogen flow.
Heating device: Temperature control accuracy ±2℃.
Nitrogen: High-pressure bottled
Transformer oil: Meet the requirements of GB2356.
15.2 Sample preparation
Cut the normalized sample into small pieces with a surface area of less than 1cm2, a total of 75cm2 sample, put it in a container, and fill it with 750mL transformer oil. Fill another container with 750mL of the same transformer oil. Then slowly pass nitrogen flow into the container to drive out the air in the container and keep the container in a nitrogen atmosphere. After heating to 100℃±2℃ and keeping it for 96h, cool it to 70℃±2℃ and cut off the nitrogen flow. Transfer the transformer oil to the liquid dielectric loss factor test cell that has been preheated to 70℃±2℃. 15.3 According to the provisions of GB/T5654, the dielectric loss factors of the two transformer oils were tested at 70℃±2℃. 15.4 Results
The increase in the dielectric loss factor of the test oil to the blank oil was taken as the contamination of the transformer oil. People's Republic of China
Mechanical Industry Standard
Electrical Corrugated Insulating Paper
Part 2: Test Method
JB/T10441.2—2004
Published and distributed by Machinery Industry Press
No. 22, Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm
1/16·0.75 Printing Sheet· 15,000 words
1st edition, 1st printing, August 2004
Book number: 151117352
Website: http://cmpbook.comEditorial office phone: (010) 88379779
Direct sales center phone:
(010 88379693
All books without anti-counterfeiting labels on the cover are pirated
Copyright reserved
Infringements will be prosecuted000lg ash content is calculated according to formula (6):
As=7-msx100%
Wherein:
A—the value of the ash content of the sample, %:
—the value of the weight, in g:
—the value of the weight of the sample in the crucible before calcination, in g:
—the value of the weight of the sample in the crucible after calcination, in g. 11.4 Results
The median of the three tests is taken as the ash content result, and the maximum and minimum values are reported, with an accuracy of 0.1%. 12 Conductivity of water extract
According to 4.1 of GB/T7196-1987.
The median of the three tests is taken as the result of the conductivity of water extract, and the maximum and minimum values are reported. 13 pH value of water extract
13.1 Instrument
pH value measuring instrument: the accuracy can be read to 0.1 unit. 13.2 Preparation of water extract
Same as Chapter 9.
13.3 Determination of pH value
Perform according to 7.2 of GB/T1545.2-1989: accurate to 0.01(6)
JB/T10441.2-2004
13.4 Result
Take the median of the three test values as the result of pH of water extract, and report the maximum and minimum values, accurate to 0.1 unit. 14 Electrical strength
Electrical strength shall be carried out in accordance with GB/T1408.1-1999, and the following provisions shall be made: a) The electrodes shall be 25mm/75mm, and the voltage shall be continuously increased; b) For the test in air, the sample shall be dried at 105℃±2℃ for 2h before being tested at room temperature. During the operation, it shall be ensured that the sample does not re-absorb moisture and significantly affect the test results.
c) Test in oil: the sample should be dried at 105℃±2℃ for 2h, then taken out and put into transformer oil preheated to 90℃, and then tested in oil after cooling to room temperature.
d) The median of nine test values shall be taken as the result, and the maximum and minimum values shall be reported. 15 Contamination of transformer oil
15.1 Equipment and instruments
The test cell for determining the liquid dielectric loss factor or volume resistivity shall comply with the requirements of GB/T5654. Container for sample preparation: A clean three-mouth container suitable for accommodating 75cm sample and 750mL insulating liquid, and convenient for measuring temperature and passing nitrogen flow.
Heating device: Temperature control accuracy ±2℃.
Nitrogen: High-pressure bottled
Transformer oil: Comply with the requirements of GB2356.
15.2 Sample preparation
Cut the normalized sample into small pieces with a surface area of less than 1cm2, a total of 75cm2 samples, put them in a container, and fill them with 750mL transformer oil. Fill another container with 750mL of the same transformer oil. Then slowly pass nitrogen gas into the container to drive out the air in the container and keep the container in a nitrogen atmosphere. After heating to 100℃±2℃ and keeping it for 96h, cool it to 70℃±2℃ and cut off the nitrogen gas flow. Transfer the transformer oil to the liquid dielectric loss factor test pool that has been preheated to 70℃±2℃. 15.3 According to the provisions of GB/T5654, test the dielectric loss factors of the two transformer oils at 70℃±2℃ respectively. 15.4 Results
The increase in the dielectric loss factor of the sample oil to the blank oil is taken as the contamination of the transformer oil. People's Republic of China
Mechanical Industry Standard
Electrical Corrugated Insulating Paper
Part 2: Test MethodswwW.bzxz.Net
JB/T10441.2—2004
Published and distributed by Machinery Industry Press
No. 22, Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm
1/16·0.75 Sheet· 15,000 words
1st edition, 1st printing, August 2004
Book number: 151117352
Website: http://cmpbook.comEditorial office phone: (010) 88379779
Direct sales center phone:
(010 88379693
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Infringements will be prosecuted000lg ash content is calculated according to formula (6):
As=7-msx100%
Wherein:
A—the value of the ash content of the sample, %:
—the value of the weight, in g:
—the value of the weight of the sample in the crucible before calcination, in g:
—the value of the weight of the sample in the crucible after calcination, in g. 11.4 Results
The median of the three tests is taken as the ash content result, and the maximum and minimum values are reported, with an accuracy of 0.1%. 12 Conductivity of water extract
According to 4.1 of GB/T7196-1987.
The median of the three tests is taken as the result of the conductivity of water extract, and the maximum and minimum values are reported. 13 pH value of water extract
13.1 Instrument
pH value measuring instrument: the accuracy can be read to 0.1 unit. 13.2 Preparation of water extract
Same as Chapter 9.
13.3 Determination of pH value
Perform according to 7.2 of GB/T1545.2-1989: accurate to 0.01(6)
JB/T10441.2-2004
13.4 Result
Take the median of the three test values as the result of pH of water extract, and report the maximum and minimum values, accurate to 0.1 unit. 14 Electrical strength
Electrical strength shall be carried out in accordance with GB/T1408.1-1999, and the following provisions shall be made: a) The electrodes shall be 25mm/75mm, and the voltage shall be continuously increased; b) For the test in air, the sample shall be dried at 105℃±2℃ for 2h before being tested at room temperature. During the operation, it shall be ensured that the sample does not re-absorb moisture and significantly affect the test results.
c) Test in oil: the sample should be dried at 105℃±2℃ for 2h, then taken out and put into transformer oil preheated to 90℃, and then tested in oil after cooling to room temperature.
d) The median of nine test values shall be taken as the result, and the maximum and minimum values shall be reported. 15 Contamination of transformer oil
15.1 Equipment and instruments
The test cell for determining the liquid dielectric loss factor or volume resistivity shall comply with the requirements of GB/T5654. Container for sample preparation: A clean three-mouth container suitable for accommodating 75cm sample and 750mL insulating liquid, and convenient for measuring temperature and passing nitrogen flow.
Heating device: Temperature control accuracy ±2℃.
Nitrogen: High-pressure bottled
Transformer oil: Comply with the requirements of GB2356.
15.2 Sample preparation
Cut the normalized sample into small pieces with a surface area of less than 1cm2, a total of 75cm2 samples, put them in a container, and fill them with 750mL transformer oil. Fill another container with 750mL of the same transformer oil. Then slowly pass nitrogen gas into the container to drive out the air in the container and keep the container in a nitrogen atmosphere. After heating to 100℃±2℃ and keeping it for 96h, cool it to 70℃±2℃ and cut off the nitrogen gas flow. Transfer the transformer oil to the liquid dielectric loss factor test pool that has been preheated to 70℃±2℃. 15.3 According to the provisions of GB/T5654, test the dielectric loss factors of the two transformer oils at 70℃±2℃ respectively. 15.4 Results
The increase in the dielectric loss factor of the sample oil to the blank oil is taken as the contamination of the transformer oil. People's Republic of China
Mechanical Industry Standard
Electrical Corrugated Insulating Paper
Part 2: Test Methods
JB/T10441.2—2004
Published and distributed by Machinery Industry Press
No. 22, Baiwanzhuang Street, Beijing
Postal Code: 100037
Format 890mm×1240mm
1/16·0.75 Sheet· 15,000 words
1st edition, 1st printing, August 2004
Book number: 151117352
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