This standard specifies the following test methods: - Test method 12: Solvent resistance - Test method 16: Refrigerant resistance - Test method 17: Direct solderability - Test method 20: Hydrolysis and transformer oil resistance For definitions, general principles of test methods and a list of winding wire test methods, see GB/T 4074.1. GB/T 4074.4-1999 Winding wire test methods Part 4: Chemical properties GB/T4074.4-1999 Standard download decompression password: www.bzxz.net

GB/T4074.1~4074.6—1999
This standard is equivalent to the International Electrotechnical Commission (IEC) standard IEC60851 "Winding Wire Test Method" series of standards. This series of standards are:
IEC60851-1:1996
IEC60851-2:1996
IEC60851-3.1996
IEC60851-4:1997
IEC60851-5.1996
IEC60851-6:1996
Winding Wire Test Method Test methods
Part 1: General provisions
Test methods for winding wires
Part 2: Dimensional measurement
Test methods for winding wires
Part 3: Mechanical properties
Test methods for winding wires
Part 4: Chemical properties
Test methods for winding wires Part 5: Electrical properties Test methods for winding wires
Part 6: Thermal properties||t t||Corresponding to the IEC60851 series of standards, this standard is divided into the following parts under the general title of "Test methods for winding wires": Test methods for winding wires Part 1: General provisions GB/T4074.1—1999
GB/T4074.2—1999
Test methods for winding wires Part 2: Dimensional measurement GB/T4074.3—1999
Test methods for winding wires Part 3: Mechanical properties Test methods for winding wires Part 4: Chemical properties GB/T4074.4—1999
GB/T4074.5—1999
Test methods for winding wires Part 5: Electrical properties GB/T4074.6—1999
Test methods for winding wires Part 6: Thermal properties Parts 2, 3, 4, 5 and 6 should be used together with Part 1. According to the provisions of GB/T1.1-1993 and the first amendment (1995), the foreword of the adopted object should be retained when adopting an international standard. Since the IEC60851 standard consists of 6 parts, all 6 parts have a foreword. Therefore, they are combined into the "IEC Foreword" of this standard. The "Introduction" of each part is also combined into the IEC Introduction of this standard. In addition, some editorial errors in IEC60851 were corrected when formulating this standard.
This standard cancels GB/T4074.15-1983\Reciprocating paint scraping test method", GB/T4074.18-1983\Breakdown voltage aluminum foil method", GB/T4074.28-1983 trichloroethylene and methanol extraction method", GB/T4074.30-1983\Chlorodifluoromethane solvent method" and GB/T4074.31-1983\Chlorodifluoromethane foaming method". This standard adds the self-adhesive layer thickness of enameled round wire, the bonding strength of twisted coils and the friction test methods. This standard revises GB/T4074.23-1983 "Test method for resistance to water-containing transformer oil". This standard retains the type test (T), extraction test (T) and extraction test (T) in GB/T4074.1-1983. The definitions of sample test (S) and routine test (R) are used to facilitate the implementation of the enameled wire product standard. Since the first amendment to IEC60172 (1998) has specified the temperature index determination method for enameled flat wire and film wrapped wire, the test method 15 "Temperature Index" in Part 6 "Thermal Properties" of this standard has been modified accordingly. This standard replaces GB/T4074-1983 and GB/T1343-1984 standards from the date of implementation. The appendices to this standard are all suggestive appendices. This standard was proposed by the State Bureau of Machinery Industry. This standard is under the jurisdiction of the National Technical Committee for Standardization of Wires and Cables. The main drafting units of this standard: Shanghai Cable Research Institute, Fuzhou Datong Electromechanical Co., Ltd., Tongling Jingda Copper Materials Group Co., Ltd., Zhengzhou Electromagnetic Wire Factory, Hengyang Instrument Machinery Factory. The main drafters of this standard: Chen Huimin, Shu Yingchun, Zheng Qirong, Zhu Qiang, Hu Jie, Yin Yuelu. 1
GB/T4074.14074.6—1999
IEC Foreword
1.IEC (International Electrotechnical Commission) is an international standardization organization composed of national electrotechnical committees (IEC National Committees). The purpose of EC is to promote international cooperation on all issues of standardization in the electrical and electronic fields. To achieve this purpose, in addition to organizing various activities, EC also publishes international standards and entrusts technical committees to formulate these standards. Any national committee interested in a certain standard may participate in the formulation of the standard. 2. Technical Committee IEC formal resolutions or agreements drawn up on behalf of the National Committees on technical issues of particular concern to them express as far as possible the international consensus on these issues. 3 These resolutions or agreements are published in the form of standards, technical reports or guidelines, which are used internationally in the form of recommended documents and are recognized by the National Committees in this sense. 4 In order to promote international unification, the IEC National Committees frankly adopt IEC International Standards in their countries and regions to the greatest extent possible. Any differences between EC standards and corresponding national or regional standards should be clearly pointed out in the national or regional standards. 5. IEC does not provide a marking method to indicate IEC approval, nor does IEC assume responsibility for any equipment that claims to comply with the requirements of a standard.
6. It must be noted that some of the contents of this international standard may be subject to patent rights. IEC shall not be responsible for identifying any or all such patent rights.
International Standard IEC60851-160851-6 was prepared by IEC Technical Committee 55 "Winding Wire". The second edition of IEC60851-1 standard cancels and replaces the first edition of 1985 and makes technical revisions. The text of this standard is based on the following documents: FDIS Documents
55/470A/FDIS
Voting Report
55/511/RVD
Full information on the voting for the approval of this standard can be found in the "Voting Report" listed in the table above. Appendix A is an informative appendix only.
The second edition of IEC60851-2 standard cancels and replaces the first edition published in 1985 and Amendment No. 1 (1992), and is technically revised.
The text of this standard is based on the following documents: FDIS Documents
55/471A/FDIS
Voting Report
55/512/RVD
Full information on the voting for the approval of this standard can be found in the "Voting Report" listed in the table above. The first amendment to IEC60851-2 is based on the following documents: FDIS Document
55/587/FDIS
Voting Report
55/605/RVD
All information on the voting to approve this standard can be found in the "Voting Report" listed in the table above. 1
GB/T4074.1~4074.6—1999
The second edition of IEC60851-3 standard cancels and replaces the first edition published in 1985 and its first and second amendments (1992), and makes technical revisions.
The text of this standard is based on the following documents:FDIS Document
55/472A/FDIS
Voting Report
55/513/RVD
Full information on the voting for the approval of this standard can be found in the "Voting Report" listed in the table above. Appendices A and B are only informative appendices. Amendment No. 1 to IEC60851-3 is based on the following documents:FDIS Document
55/592/FDIS
Voting Report
55/612/RVD
Full information on the voting for the approval of this standard can be found in the "Voting Report" listed in the table above. The second edition of IEC60851-4 standard cancels and replaces the first edition published in 1985 and its amendment No. 1 (1992), and makes technical revisions.
The text of this standard is based on the following documents: FDIS Documents
55/473A/FDIS
Voting Report
55/514/RVD
Full information on the voting and approval of this standard can be found in the "Voting Report" listed in the table above. Amendment No. 1 to IEC60851-4 is based on the following documents: FDIS Documents
55/597/FDIS
Voting Report
55/614/RVDWww.bzxZ.net
Full information on the voting and approval of this standard can be found in the "Voting Report" listed in the table above. IEC60851-4 Amendment No. 2.The first edition is a combination of the second edition of EC60851-4 (1996) and its first amendment (1997). The third edition of IEC60851-5 standard cancels and replaces the second edition published in 1988 and its first amendment (1990), and makes technical revisions.
This standard text is based on the following documents: FDIS document
55/474A/FDIS
Voting report
55/515/RVD
Full information on the voting to approve this standard can be found in the "Voting Report" listed in the table above. The first amendment to IEC60851-5 is based on the following documents:1
GB/T4074.1～4074.6—1999
FDIS Document
55/542/FDIS
Voting Report
55/572/RVD
Full information on the voting for the approval of this standard can be found in the "Voting Report" listed in the table above. The second edition of IEC60851-6 standard cancels and replaces the first edition published in 1985 and makes technical revisions. The text of this standard is based on the following documents:FDIS Document
55/475A/FDIS
Voting Report
55/516/RVD
Full information on the voting for the approval of this standard can be found in the "Voting Report" listed in the table above. Appendix A is an informative appendix only.
The first amendment to IEC60851-6 is based on the following documents:FDIS Document
55/561/FDIS
Voting Report
55/593/RVD
All information on the voting to approve this standard can be found in the "Voting Report" listed in the table above. N
GB/T4074.14074.6—1999
GB/T4074.1~4074.6 is a part of the series of standards for insulated wires for windings of electrical equipment. This series of standards consists of 3 parts:
a) Test methods (GB/T4074);
b) Product standards (IEc60317);
c) Packaging (JB/T8135).
1 Scope
National Standard of the People's Republic of China
Test methods for winding wiresPart 4: Chemical properties
This standard specifies the following test methods:
-Test method 12: Solvent resistance
-Test method 16: Refrigerant resistance
-Test method 17: Direct solderability
-Test method 20: Hydrolysis resistance and transformer oil resistanceGB/T4074.4—1999
idtIEC60851-4:1997
Replaces GB/T4074. 16—1983
GB/T4074.23—1983
GB/T4074.26—1983
GB/4074.28~4074.31—1983
For definitions, general principles of test methods and a list of winding wire test methods, please refer to GB/T4074.1. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T4074.1-1999 Winding wire test methods Part 1: General provisions (idtIEC60851-1: 1996) GB/T4074.3-1999 Winding wire test methods Part 3: Mechanical properties (idtIEC60851-3: 1996) GB/T4074.5-1999 Winding wire test methods Part 5: Electrical properties (idtIEC60851-5: 1996) IEC60296: 1982 Specification for unused mineral insulating oils for transformers and switches IEC60554-1: 1977 Specification for fiber paper for electrical use Part 1: Definitions and general performance requirements 3 Test method 12: Solvent resistance (applicable to enameled round wires and enameled flat wires with conductor nominal diameters of 0.250 mm or more) Solvents have no obvious effect on the enamel of enameled wires of 0.250 mm and below. This test is only applicable to enameled wires above 0.250 mm. Solvent resistance is expressed by the pencil hardness of the enameled wire after solvent treatment. 3.1 Test equipment
The following solvents should be used:
-Standard solvents specified below, or
-Solvents agreed upon by both parties.
Standard solvents are mixtures of the following proportions (volume ratio):
-60% petroleum solvent, with a maximum aromatic content of 18%-30% xylene;
-10% butanol.
Approved by the State Administration of Quality and Technical Supervision on November 11, 1999, and implemented on May 1, 2000
GB/T4074.4-1999
The pencil hardness used should comply with the provisions of the relevant product standards. Before each test, the pencil tip should be sharpened with a fine file and ground to a 60° angle symmetrical to its axis as shown in Figure 1.
3.2 Test procedure
A straightened sample of enameled wire about 150 mm long shall be pre-treated in a forced-air oven at (130 ± 3) °C for 10 min. The effective length sample shall then be immersed in a glass container containing a standard solvent at a temperature of (60 ± 3) °C for 30 min. The sample shall then be removed from the solvent. The hardness of the surface shall be measured within 30 s after the sample is removed. The sample shall be placed on a smooth hard surface as shown in Figure 1. If it is a flat wire, the test shall be carried out on its wide side. The pencil shall be placed at an angle of about 60° on the surface of the enameled wire and the pencil tip shall be slowly moved along the surface of the enameled wire with a pressure of about 5 N. Measure 3 times. If the paint film is scraped off to expose the conductor, it shall be recorded in the report. Note
1 This test method is also applicable to resistance to other solvents, such as oil. 2 If the hardness of the paint film is to be measured, the pencil hardness that just does not remove the insulation on the conductor surface shall be taken as the hardness of the enameled wire surface and expressed as pencil hardness. The pencil hardness series is as follows:
6B5B4B8B2BBHB
4 Test Method 16: Resistance to Cryogens (Applicable to Enameled Round Wire) 11
Resistance to Cryogen R22 is expressed by the amount of extracts and the breakdown voltage of the enameled wire film placed in the cryogen. NOTE
1 Refrigerants other than monochlorodifluoromethane (refrigerant R22) may be used. In this case, critical data for this solvent should be obtained and the autoclave should be designed according to the changed test conditions.
2 Refrigerants such as monochlorodifluoromethane and cleaning agents such as trichlorotrifluoroethane (R113) are ozone depleting chemicals (ODC). Therefore, it will be necessary to revise this test method as soon as such substitutes are found. 4.1 Extraction
4.1.1 Test Principle
The siphon cup containing the enameled wire sample is placed in an autoclave. The extracts of the enameled wire sample placed in the cryogen under high temperature and pressure are measured.
4.1.2 Test equipment
The following test equipment shall be used:
A siphon cup as shown in Figure 2, with a volume of 450 mL to the siphon level; a 2000 mL autoclave with an inner diameter of about 100 mm and a pressure resistance of 20 MPa. It is preferably a weld-free structure with a heating control system; a top cover of the autoclave with a condenser, as shown in Figure 3; a forced air oven.
4.1.3 Test specimens
Eight enameled wire specimens, each containing (0.6±0.1) g of paint film, are respectively wound into a coil of 70 turns. The specimens shall be degreased and treated in a forced air oven at (150±3)°C for 15 min. After cooling for 30 min, weigh the eight specimens to the nearest 0.0001 g and record the initial total weight M1.
4.1.4 Test procedure
Place 8 samples in the siphon cup, and the siphon cup is suspended below the condenser on the top cover of the autoclave (25±5) mm. Then install the pressure gold, and the autoclave should be filled with R22 refrigerant (70025). Connect the inlet and outlet water pipes of the condenser, and use the heating control system to heat the autoclave to 70℃～80℃. Adjust the water flow of the condenser to keep the reflux frequency of the siphon cup at 20 to 25 times per hour. The extraction time is 6h. 2
GB/T4074.4—1999
Within the above-specified temperature range, the vapor pressure of R22 refrigerant is 3MPa～3.7MPa. The critical pressure of R22 refrigerant is 5MPa. The pressure in the autoclave should not exceed 4MPa. Therefore, before use, the overpressure control valve (safety valve) should be checked to ensure its normal function.
Note: If the pressure exceeds 4MPa or if the water flow through the condenser is interrupted, it is recommended to use a heating system that can automatically cut off. After the extraction is completed, the autoclave is cooled by liquefying the refrigerant with dry ice. Then vent and open the autoclave. Elute the sample and siphon cup with distilled trichlorotrifluoroethane (oil-free R113) (see Note 2 in this chapter). The eluent should be poured into the autoclave. Then evaporate the refrigerant until about 5mm of refrigerant remains at the bottom of the autoclave. Rinse the autoclave wall with dichloromethane twice in succession, 100mL each time. Then evaporate the solvent in a fume hood or a well-ventilated place until about 5mm of solvent remains at the bottom of the autoclave. Pour the above extract into a pre-dried and weighed aluminum weighing scale III, rinse with 15mL of dichloromethane, and then dry and evaporate at (150±3℃) for 1h. Cool the weighing dish in a desiccator to room temperature. Weigh the weighing scale III containing the residual extract to an accuracy of 0.0001g. Subtract the original weight of the same weighing scale III, and the difference is the total weight of the extracts of the 8 samples M2. Use appropriate chemical methods to remove the insulation on the coil sample without damaging the conductor. The bare conductor should be dried at (150±3)℃ for (15±1)min and then cooled to room temperature in a desiccator. Weigh and be accurate to 0.0001g, the total weight of the 8 conductors is Ms. 4.1.5 Test results
The extract is calculated as follows:
Extract = M, = m×1 00%
Do a test. Record the weights M1, M, and Ms, the temperature, the pressure of the autoclave and the percentage of extract. 4.2 Breakdown voltage
4.2.1 Test principle
The sample prepared in accordance with Article 4.4.1 of GB/T4074.51999 is placed in the autoclave specified in Article 4.2.2. Measure the breakdown voltage of the sample placed in a refrigerant under high temperature and pressure. 4.2.2 Test procedure
The sample should be treated in an oven at (150 ± 3) °C for 4 h and then placed in a pressure vessel filled with (1400 ± 50 g) of refrigerant. The autoclave should be heated for (72 ± 1) h in accordance with Article 4.1.4 of this standard. After the test, cool the autoclave and vent according to Article 4.1.4. When the pressure in the autoclave is less than 0 .2MPa absolute value, open the autoclave and transfer the sample to an oven at (150±3)℃ within 25s~30s, and heat for (10±1)min. After taking out the sample from the oven and cooling it to room temperature, measure the breakdown voltage according to Article 4.4.1 of GB/T4074.5-1999. 4.2.3 Test results
Measure 5 samples. Record 5 test values. 5 Test method 17: Direct solderability (applicable to enameled round wire and bundled wire) Direct solderability is expressed by the time required for the sample to be immersed in the solder tank to remove the paint film and plate the tin layer. 5.1 Test equipment
The following test equipment should be used:
--temperature-controlled solder tank. When the sample is immersed at the temperature specified in the relevant product standard, its volume should be large enough to maintain a constant solder temperature. degree. The solder composition shall be tin and lead in a weight ratio of 60/40; a clamping device that holds the specimen when immersed in the solder vat and has a free length of at least 20 mm between the clamping points. The material of the specimen clamping device shall not contaminate the solder and its size shall be such that it does not significantly affect the temperature of the solder vat during immersion. Note that solder contamination caused by oxidation or copper may affect the test results. 5.2 Preparation of specimens
GB/T4074.4—1999
5.2.1 Eight straight enameled wire specimens with a conductor nominal diameter of 0.050 mm and below shall be twisted together without abnormal tension and then wound on the specimen clamping device. 5.2.2 One straight enameled wire specimen with a conductor nominal diameter of more than 0.050 mm and less than 0.100 mm shall be wound on the specimen clamping device. 5.2.3 One straight enameled wire specimen with a conductor nominal diameter of more than 0.100 mm shall be 200 mm.
5.2.4 Wire harnesses with an outer diameter of 0.250 mm or less One wire harness is wound around one end of a clean, straight, tinned copper wire with a nominal conductor diameter of 0.800 mm and a length of 200 mm for a length of 15 mm to 20 mm. The number of turns is 5 to 10, with a slight gap between each turn. 5.2.5 Wire harnesses with an outer diameter of more than 0.250 mm
A straightened wire harness of about 200 mm is required. 5.3 Test procedure
The specimen should be placed vertically in the middle of the soldering vat, and the temperature of the soldering vat shall be in accordance with the provisions of the relevant product standards. The lower end of the specimen should be placed 20 mm below the liquid level of the soldering vat. The position where the specimen is immersed should be within 10 mm of the temperature measurement point. After the immersion time specified in the relevant product standards, the specimen should be moved sideways and then removed.
Use a 6x to 10x magnifying glass to check the surface of the tinned wire. In case of enameled wire with a nominal conductor diameter of less than 0.100 mm, the inspection shall be limited to the free length of the specimen.
Measure 3 specimens. Record the surface condition of the enameled wire. 6 Test method 20: Hydrolysis resistance and transformer oil resistance (applicable to enameled wire) Hydrolysis resistance is indicated by the appearance and adhesion of the specimen placed in aqueous transformer oil under high temperature and pressure. Transformer oil resistance is indicated by the breakdown voltage and flexibility of the specimen placed in transformer oil under high temperature and pressure. Note: The paint film may be affected by hydrolysis and/or absorption. If only absorption occurs, the specimen shall be dried at (125 ± 3) °C for 30 minutes before the breakdown voltage test to recover. For ease of handling specimens and testing, enameled wire with a nominal conductor diameter between 0.800 mm and 1.500 mm is usually used. 6.1 Round wire
6.1.1 Test equipment
The following test equipment should be used:
——Two sealable glass tubes, 25mm in diameter and 300mm in length; a 400mL500mL stainless steel autoclave, with a pressure resistance of 6×10°Pa. It is best to have a weld-free structure and a heating control system; a transformer oil that complies with IEC60296;
a paper that complies with Type I in IEC60554-1.
6.1.2 Sample preparation
The following samples should be prepared:
-12 straightened enameled wire samples of about 200mm in length:-10 twisted wire pair samples prepared in accordance with Article 4.4.1 of GB/T4074.5-1999;-3 round rod winding samples prepared in accordance with Article 5.1.1 of GB/T4074.3-1999. 6.1.3 Test procedure
6.1.3.1 Hydrolysis resistance
Place 6 straightened test specimens in accordance with 6.1.2 and 80 mL of degassed dry transformer oil in each glass tube. Add 0.24 mL ± 0.01 mL of distilled water to one of them. Seal the two test tubes and heat them in an oven at (150 ± 3) °C for 24 h. Then remove the test tubes from the oven, cool to room temperature and open. Inspect the specimens with normal vision. 4
GB/T4074.4—1999
Perform a test. Any changes in the appearance and adhesion of the specimens should be recorded. 6.1.3.2 Transformer oil resistance
Unless otherwise agreed between the supplier and the buyer, the autoclave should be filled with the mixture specified in Table 1. Table 1 Mixture composition
Transformer oil
*To be determined by negotiation between the supplier and the buyer.
Volume, %
0.26±0.002
Place 10 twisted wire pair samples, 3 round rod winding samples and additional enameled wire in the autoclave to achieve the paint film amount specified in Table 11). The paper should be dried for 16 hours at a maximum pressure of 20Pa and a temperature of (90±3)℃, or dried for 4 hours at a maximum pressure of 20Pa and a temperature of (105±3)℃. After pretreatment, the autoclave should be filled with degassed dry transformer oil that meets the requirements of Table 1. The sealed autoclave should be heated at a temperature of (105±3)℃ for (1000±10)h. Then cool to room temperature, vent and open the autoclave. The breakdown voltage of 5 twisted wire pair samples should be measured in transformer oil at a temperature of (105±3)℃ according to Article 4.4.2 of GB/T4074.5-1999. The remaining 5 twisted wire pair samples should be dried at (125 ± 3) ° C for about 30 minutes, cooled to room temperature, and then the breakdown voltage should be measured in transformer oil at (105 ± 3) ° C according to GB/T4074.5-1999 Section 4.4.2. Check whether the round rod wound sample is cracked according to GB/T4074.3-1999 Section 5.1.1.1. Make a test. The breakdown voltage value and any cracking should be recorded. 6.2 Flat wire
6.2.1 Test equipment
Test equipment that complies with Section 6.1.1 should be used. 6.2.2 Sample preparation
The following samples should be prepared:
-10 straightened enameled wire samples of about 200 mm in length;-4 samples according to GB/T4074.5-1999 Section 4.6.1 U-shaped test specimen prepared in accordance with 5.1.2 of GB/T4074.3-1999; -2 round bar bending test specimens prepared in accordance with 5.1.2 of GB/T4074.3-1999. 6.2.3 Test procedure
6.2.3.1 Hydrolysis resistance
Place 5 straightened test specimens in accordance with 6.2.2 and 80mL of degassed dry transformer oil in each glass tube. Add 0.24mL±0.01mL of distilled water to one of them. Seal the two test tubes and heat them in an oven at (150±3)℃ for 24h. Then remove the test tubes from the oven, cool to room temperature and open. Inspect the specimens with normal vision. Perform a test. Any changes in the appearance and adhesion of the specimens should be recorded. 1) The total weight of enameled wire required to achieve the specified paint film amount can be calculated as follows: YXV
M=600××D
Wherein, V—volume of pressure vessel, mL;
Y——weight of 1m enameled wire, g
s—paint film thickness, mm;
D——outer diameter of enameled wire, mm.
6.2.3.2 Transformer oil resistance
GB/T4074.4—1999
Place 4 U-shaped specimens, 2 round bar bending specimens and additional enameled wire in the autoclave to achieve the paint film amount 1 specified in Table 1. The paper should be dried at a maximum pressure of 20Pa and a temperature of (90±3)℃ for 16h, or at a maximum pressure of 20Pa and a temperature of (105±3)℃ for 4h. After pretreatment, the autoclave should be filled with degassed and dried transformer oil that meets the requirements of Table 1. The sealed autoclave shall be heated at (105±3)℃ for (1000±10)h. Then cool to room temperature, vent and open the autoclave. The breakdown voltage of two U-shaped specimens shall be measured in transformer oil at (105±3)℃ according to Article 4.6.2 of GB/T4074.5-1999. The remaining two U-shaped specimens shall be dried at (125±3)℃ for about 30min, cooled to room temperature, and then measured in transformer oil at (105±3)℃ according to Article 4.6.2 of GB/T4074.5-1999. Check whether the round bar bending specimen is cracked according to Article 5.1.2 of GB/T4074.3-1999. Perform a test. The breakdown voltage value and any cracking shall be recorded. Figure 1 Pencil and sample for solvent resistance test
1) The total weight of enameled wire required to achieve the specified paint film can be calculated as follows: YXV
385X8X(B+A)
Wherein: V-
Volume of pressure vessel, mL,
-1m weight of enameled wire, g;
8—paint film thickness, mm;
-enameled flat wire wide side dimensions, mm, An——enameled flat wire narrow side dimensions, mm. Instructions for use:
1 The use of codes B and A instead of W and T specified in EC60851-4:1997 to indicate the wide and narrow side dimensions of enameled flat wire is to be consistent with the provisions of the current national standard GB/T6108-1985. 6
GB/T4074.4—1999
Cup height: 82mm; cup diameter: 84mm, tube diameter: 5mm Figure 2 Siphon cup for refrigerant extraction test
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