This standard specifies the following test methods: - Test method 9: Thermal shock - Test method 10: Softening breakdown - Test method 15: Temperature index - Test method 12: Weight loss For the definition, general principles of test methods and a list of winding wire test methods, see GB/T 4074.1. GB/T 4074.6-1999 Winding wire test methods Part 6: Thermal properties GB/T4074.6-1999 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/RVD
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 6: Thermal properties
This standard specifies the following test methods:
-Test method 9: Thermal shock
-Test method 10: Softening breakdown
-Test method 15: Temperature index
-Test method 12 Weight loss
GB/T4074.6—1999
idtIEC60851-6:1996
AmendmentNo.1:1 997
Replaces GB4074.11~4074.13—1983
GB4074.21—1983bZxz.net
GB4074.24~4074.25—1983
For definitions, general principles of test methods and a list of winding wire test methods, see 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 Test methods for winding wires Part 1: General provisions (idtIEC60851-1: 1996) GB/T4074.3—1999 Test methods for winding wires Part 3: Mechanical properties (idtIEC60851-3: 1996) GB/T4074.5—1999 Test methods for winding wires Part 5: Electrical properties (idtIEC60851-5: 1996) IEC601721987 Test method for measuring temperature index of enameled wire 3 Test method 9: Thermal shock (applicable to enameled wire and film winding wire) Thermal shock reflects the ability of the enameled wire to withstand temperature after being stretched and/or wound or bent on a round rod. 3.1 Preparation of test specimens
3.1.1 Round wire
Test specimens shall be prepared in accordance with the following provisions:
For enameled wires with a conductor nominal diameter of 1.600 mm or less, follow Article 5.1.1 of GB/T4074.3-1999; For enameled wires with a conductor nominal diameter of more than 1.600 mm, follow Article 5.2 of GB/T4074.3-1999: For film-wound wires with a conductor nominal diameter of 1.600 mm or less, follow Article 5.1.1 of GB/T4074.3-1999; For film-wound wires with a conductor nominal diameter of more than 1.600 mm, follow Article 5.5.4 of GB/T4074.3-1999. 3.1.2 Flat wire
The specimens shall be prepared in accordance with 5.1.2 of GB/T4074.3-1999, but only the wide side shall be bent (on the narrow side). 3.2 Test procedure
The specimens shall be heated in a forced-air oven for 30 min at a temperature specified in the relevant product standard ± 5°C. Remove the specimens from the oven and cool to room temperature, then check the insulation for cracks using a magnifying glass with a magnification as specified in Table 1. Approved by the State Administration of Quality and Technical Supervision on November 11, 1999, and implemented on May 1, 2000
3.3 Test results
GB/T4074.6-1999
If it is round wire, measure 3 specimens; if it is flat wire, measure 2 specimens. Any cracks detected shall be recorded. Table 1 Magnification
Specimen size
Round wire with a conductor nominal diameter of 0.040 mm or lessRound wire with a conductor nominal diameter of 0.040 mm or moreRound wire with a conductor nominal diameter of 0.500 mm or lessRound wire with a conductor nominal diameter of 0.500 mm or moreRound wire with a conductor nominal diameter of 0.500 mm or moreFlat wire
10~15 times
1~10 times
1~6 times
6~10 times
Magnification
4 Test method 10: Softening breakdown (applicable to enameled round wire and film-wrapped round wire with a conductor nominal diameter of 0.100 mm or more and 1.600 mm or less)
Two enameled wire specimens intersect vertically, and a specified load is applied to the intersection. The softening breakdown is expressed by the temperature when a short-circuit current is generated between the specimens.
Note: In many cases, the softening breakdown temperature indicates the temperature at which the insulation decomposes. 4.1 Test equipment
The following test equipment should be used:
Brass or aluminum metal block. With electrical heating and temperature measurement and control devices, there are two sockets on it to insert two specimens that cross vertically in the center of the metal block, and a ceramic pressure rod used to apply a load on the intersection, as shown in Figure 1; a transformer with a capacity of at least 100VA and an output AC test voltage of (100±10)V, connected to an overcurrent device that operates when the current is (5±1)mA, and a current limiting resistor used to limit the current to not more than 50mA. 4.2 Test procedure
Insert two vertically intersecting straight specimens into a metal block preheated to the temperature specified in the relevant product standard. The temperature should be measured as close to the intersection as possible, and the measured value should be within the specified value ±3℃. The intersection should be centered under the pressure rod. If the conductor nominal diameter is less than 0.200mm, two specimens should be inserted into the jack in parallel, and the third specimen should be placed vertically on the first two specimens, and their intersection should be symmetrical to the axis of the pressure rod.
After the heating time specified in Table 2 is over, the pressure rod is used to apply the load specified in Table 3. Then immediately apply the test voltage between the upper and lower specimens. If there are two parallel specimens below, they should be connected to each other. The load and test voltage are applied for 2min. Perform 3 tests. The number of short circuits should be recorded.
Heating time
Conductor nominal diameter, mm
Instructions for use:
17 The original text 0~6 times is wrong.
and below
Time interval from inserting the specimen to applying the loadmin
GB/T4074.6—1999
Table 3 Load applied at the crossover point
Conductor nominal diameter, mm
and below
5 Test method 15: Temperature index
5.1 Enameled wire
5.1.1 Round wire
The temperature index shall be measured in accordance with IEC60172 (on the un-immersed specimen). 5.1.2 Flat wire
The temperature index shall be measured in accordance with IEC60172 (on the un-immersed specimen). 5.2 Film wrapped wire 1
The temperature index shall be measured in accordance with IEC60172 (on unimpregnated specimens). 6 Test method 21: Weight loss (applicable to enameled round wire) Weight loss is a property related to the degree of curing of the enameled wire film. 6.1 Sample preparation
A sample with a film content of not less than 0.5 g shall be scrubbed clean by an appropriate method that does not affect the film. The sample shall be heated in a forced-draft oven at (130 ± 3) °C for 1 h. After removing the sample from the oven, place it in a desiccator and cool it to room temperature for at least 30 min. Then weigh the sample to an accuracy of 0.1 mg (M1).
6.2 Test procedure
The crucible shall be heated at (150 ± 3) °C for 2 h. Then place the pan containing the sample in a forced-draft oven for 2 h, and the oven temperature shall be ± 3 °C as specified in the relevant product standard. After removing the sample from the oven, place it in a desiccator and cool it to room temperature for at least 30 min. Then weigh the sample to an accuracy of 0.1 mg (M2). Remove the paint film by appropriate chemical methods, but do not damage the conductor. Dry the bare conductor at (150 ± 3) ° C for (15 ± 1) min, and then place it in a desiccator to cool to room temperature for at least 30 min. Weigh the bare conductor to an accuracy of 0.1 mg (Ms). The weight loss should be calculated as follows:
Perform 2 tests. Record 2 weight loss values.
Instructions for use:
M-Mz×100%
1] Since the first amendment to EC60172 (1998) has specified the method for determining the temperature index of enameled flat wire and film wrapped wire, this article has been modified accordingly.
GB/T4074.6—1999
1-sample; 2-sample; 3-pressure rod; 4-ceramic; 5-load; 6-metal block (copper or brass); 7-sample insertion hole; 8-temperature controller insertion hole; 9-thermocouple insertion hole; 10-load pressure rod insertion hole; 11-electric heating device; 12-temperature controller 13-insulating material in contact with the sample; 14-insulating bottom plate Figure 1 Schematic diagram of softening breakdown tester
GB/T4074.6—1999
Appendix A
(Suggestive Appendix)
High temperature failure test (applicable to enameled round wire) The high temperature failure test is expressed by the failure time of the sample under the test voltage at high temperature. Note: This test is intended to assess the ability of enameled wire to withstand voltage when overloaded at 450℃ or below. This test is not suitable for enameled wire with a failure time of only a few seconds or minutes, because the minimum failure time required by this test is 15mi. If the above short-time failure performance is required, other test methods should be used. A1 Test Equipment
The following test equipment should be used:
--Oven (forced ventilation or non-forced ventilation) with a maximum temperature of 450°C. The set temperature deviation is ±5°C. The oven should be able to reach the set temperature ±1% within 3 minutes. The oven is equipped with suitable terminals to apply the test voltage in accordance with Table 1. A transformer with a capacity of at least 100VA, which can output a 50Hz or 60Hz AC test voltage in accordance with Table A1, and is connected to an overcurrent device that operates when the overcurrent is (10±5) mA. To avoid overvoltage shock, a 1μF~2μF capacitor should be connected in parallel to the secondary terminal of the transformer. The overcurrent device can indicate a failure and disconnect the corresponding timer. Table A1 Test voltage
Insulation thickness, mm
Specimen preparation
and below
Test voltage (AC)
Prepare the specimen according to Article 4.4 of GB/T4074.51999. Experience shows that enameled wire with a nominal conductor diameter of about 1mm and a film thickness of level 2 is most convenient to handle.
Test procedure
Connect the specimen to the terminal and place it in an oven preheated to the test temperature. Immediately apply the test voltage and start timing. Measure 5 specimens. Record the failure time. The test is considered invalid if the failure time is within 15 minutes. 5
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