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GB/T 17948.1-2018 English PDF

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GB/T 17948.1-2018: Rotating electrical machines -- Functional evaluation of insulation systems -- Test procedures for wire-wound windings -- Thermal evaluation and classification
Status: Valid

GB/T 17948.1: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 17948.1-2018English754 Add to Cart 7 days [Need to translate] Rotating electrical machines -- Functional evaluation of insulation systems -- Test procedures for wire-wound windings -- Thermal evaluation and classification Valid GB/T 17948.1-2018
GB/T 17948-2003English679 Add to Cart 3 days [Need to translate] Functional evaluation of insulation systems for rotating electrical machines -- General guidelines Obsolete GB/T 17948-2003
GB/T 17948.1-2000English999 Add to Cart 4 days [Need to translate] Rotating electrical machines. Functional evaluation of insulation systems. Test procedures for wire-wound windings. Thermal evaluation and classification Obsolete GB/T 17948.1-2000

PDF similar to GB/T 17948.1-2018


Standard similar to GB/T 17948.1-2018

GB/T 20834   GB/T 20833.1   GB/T 20835   GB/T 17948.7   GB/T 17948.4   GB/T 17948.6   

Basic data

Standard ID GB/T 17948.1-2018 (GB/T17948.1-2018)
Description (Translated English) Rotating electrical machines -- Functional evaluation of insulation systems -- Test procedures for wire-wound windings -- Thermal evaluation and classification
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K20
Classification of International Standard 29.160.01
Word Count Estimation 40,479
Date of Issue 2018-07-13
Date of Implementation 2019-02-01
Older Standard (superseded by this standard) GB/T 17948.1-2000
Quoted Standard GB/T 17948.7-2016; IEC 60034-1; IEC 60085; IEC 60216-1; IEC 60216-5; IEC 60455-1; IEC 60455-2; IEC 60455-3; IEC 60464-1; IEC 60464-2; IEC 60464-3; IEC 60505
Adopted Standard IEC 60034-18-21-2012, IDT
Regulation (derived from) National Standard Announcement No. 10 of 2018
Issuing agency(ies) State Administration for Market Regulation, China National Standardization Administration
Summary This standard specifies the test procedures for the thermal evaluation and classification of insulated winding structures for AC or DC rotating electrical machines or intended for application. The test performance of the insulation structure to be evaluated is compared with the test performance of the reference insulation structure which has been proved by operational experience. GB/T 17948.7-2016 describes the basic test principles for the heat resistance test of rotating electrical insulation structures. Except as otherwise provided in this standard, follow the principles of GB/T 17948.7-2016.

GB/T 17948.1-2018: Rotating electrical machines -- Functional evaluation of insulation systems -- Test procedures for wire-wound windings -- Thermal evaluation and classification


---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Functional evaluation of insulation systems.Test procedures for wire-wound windings.Thermal evaluation and classification ICS 29.160.01 K20 National Standards of People's Republic of China Replace GB/T 17948.1-2000 Functional Evaluation of Insulation Structure of Rotating Electric Machine Winding winding test procedure for thermal evaluation and grading (IEC 60034-18-21.2012, Rotating electricalal machines-Part 18-21. 2018-07-13 released.2019-02-01 implementation State market supervision and administration China National Standardization Administration issued

Content

Foreword III Introduction IV 1 Scope 1 2 Normative references 1 3 General 1 4 sample and sample 2 5 Test procedure 3 6 diagnosis cycle 5 7 Reporting and functional assessment of the structure and baseline structure data to be assessed 6 8 Procedure 1. Test procedure for scattered coils 10 9 Procedure 2. Test procedure for the whole machine 13 10 Procedure 3. Test procedure for stator windings in the groove 15 11 Procedure 4. Magnetic pole winding test procedure 17 12 Procedure 5. Groove rotor winding test procedure 19 Appendix A (Informative Appendix) Scattered Model Coil Structure (Example) 21 Appendix B (informative) Pole winding model (example) 26 Appendix C (informative) Moisture test equipment 33 Figure 1 Identification of structures with the same heat resistance rating and the same life expectancy Figure 2 Identification of structures with the same heat resistance rating and different expected lifespans 8 Figure 3 Identification of structures to be evaluated for different heat resistance grades and the same expected lifespan 9 Figure 4 Identification of structures to be evaluated for different heat resistance levels and life expectancy 10 Figure A.1 The pre-assembly loose-wound model coil assembly 23 Figure A.2 After assembly and after immersion of the wound model coil 24 Figure A.3 Assembly of the winding model coil Figure 25 Figure B.1 Wound-wound excitation coil test device 27 Figure B.2 Wound excitation coil 27 mounted on the test device Figure B.3 Manufacturing diagram of the test device for the scattered magnetic coil of the analog magnetic pole 28 Figure B.4 Schematic diagram of the manufacturing of the test frame for the scattered coil excitation coil simulation device 29 Figure B.5 Precision winding excitation coil test device 30 Figure B.6 Precision winding excitation coil 30 mounted on the pressure device Figure B.7 Schematic diagram of simulation processing of the precision winding excitation coil test device 31 Figure B.8 Schematic diagram of the manufacturing of the precision winding excitation coil simulation frame test device 32 Figure C.1 Schematic diagram of the basic principle of cooling the test sample condensation chamber 24 Figure C.2 Sectional view of the condensation chamber containing the cooled sample 35 Table 1 Heat resistance class 3 Table 2 Recommended aging temperature and aging cycle exposure time 4 Table 3 Identification conditions of the structure to be evaluated 6 Table 4 Test voltage 12

Foreword

GB/T 17948 "Rotor motor insulation structure functional assessment" is divided into the following parts. --- Thermal evaluation and classification of test procedures for loose windings (GB/T 17948.1); --- Change of test procedure for loose winding and replacement of insulation components (GB/T 17948.2); --- Forming winding test procedure Thermal evaluation and classification of rotating electrical insulation structure (GB/T 17948.3); ---Formed winding test procedures voltage durability assessment (GB/T 17948.4); ---Formed Winding Test Procedures Multi-factor evaluation of thermal and electrical comprehensive stress durability (GB/T 17948.5); ---Formed Winding Test Procedures Thermal Mechanical Durability Assessment of Insulation Structures (GB/T 17948.6); --- General (GB/T 17948.7). This part is the first part of GB/T 17948. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 17948.1-2000 "Rotating electrical machine insulation structure functional evaluation of the winding test specification heat evaluation and Classification, the main technical changes compared with GB/T 17948.1-2000 are as follows. --- Added "recommended aging temperature and aging cycle exposure time" (see Table 2); --- Modified the withstand voltage test (see 8.4.4,.2000 version 4.4.3, 5.4.2, 6.4.3, 7.4.3, 8.4.3); --- Increased eligibility criteria in different situations (see Chapter 7). This part uses the translation method equivalent to IEC 60034-18-21.2012 "Rotating electrical machines Part 18-21. Functional evaluation of insulation structures Thermal Evaluation and Classification of Test Procedures for Decentralized Winding Windings. The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. ---GB/T 755-2008 Rotating electrical machine rating and performance (IEC 60034-1.2004, IDT) ---GB/T 11021-2014 Electrical insulation heat resistance and indication method (IEC 60085.2007, IDT) GB/T 11026.1-2016 Thermal insulation of electrical insulating materials - Part 1 . Assessment of aging procedures and test results (IEC 60216-1.2013, IDT) Thermal insulation of electrical insulating materials - Part 7. Determination of relative thermal index of insulating materials (RTE) (IEC 60216-5.2008, IDT) ---GB/T 15022 (all parts) resin-based reactive composite for electrical insulation [IEC 60455 (all parts)] ---GB/T 20112-2015 Assessment and identification of electrical insulation systems (IEC 60505.2011, IDT) This section has made the following editorial changes. --- In order to be consistent with China's existing standard system, the name of this part was changed to "Rotating electrical machine insulation structure functional evaluation loose winding Test Procedure Thermal Assessment and Classification. This part was proposed by China Electrical Equipment Industry Association. This part is under the jurisdiction of the National Rotating Electric Machine Standardization Technical Committee (SAC/TC26). This section drafted by. Shanghai Electric Apparatus Research Institute (Group) Co., Ltd., Shanghai Motor System Energy Conservation Engineering Technology Research Center Limited Company, Shandong Huali Motor Group Co., Ltd., Shanghai Dexuchi Electric Co., Ltd., Kaifeng Shengda Motor Technology Co., Ltd., Haidian Electric Research Institute, Shanghai Electrical Equipment Testing Co., Ltd., Zhejiang Rongtai Electrical Equipment Co., Ltd., Zhejiang Hulong Technology Co., Ltd. Limited company, Jiangmen Jiangyan Motor Factory Co., Ltd., Xi'an Taifu Xima Motor Co., Ltd. The main drafters of this section. Zhang Shengde, Zhou Hongfa, Zhao Chao, Wang Qingdong, Chen Xiangen, Zhu Ruizhen, Yao Peng, Huang Huijie. The previous versions of the standards replaced by this section are. ---GB/T 17948.1-2000.

Introduction

IEC 60034-18 contains several parts, giving functional evaluation and special test procedures for the insulation structure of rotating electrical machines. General rules for these procedures and qualification criteria are given in IEC 60034-18-1. IEC 60034-18-21, IEC 60034-18-31, IEC 60034-18-32, IEC 60034-18-33, IEC 60034-18-34, Detailed procedures for different types of windings are given in IEC 60034-18-41 and IEC 60034-18-42. Thermal evaluation and classification of the insulated structure of the wound winding is given in IEC 60034-18-21. The relevant parts are as follows. ---IEC 60034-18-1. General; ---IEC 60034-18-31. test procedure for forming windings; ---IEC 60034-18-41. Identification and type test of type I insulation structure of rotary electric machines powered by voltage type inverters; ---IEC 60034-18-42. Identification and identification of electrical insulation structures (type II) for partial discharge electric motors Can be tested. Functional Evaluation of Insulation Structure of Rotating Electric Machine Winding winding test procedure for thermal evaluation and grading

1 Scope

This part of GB/T 17948.1 specifies the thermal evaluation of the winding winding insulation structure for AC or DC rotating electrical machines or for application. Test procedures for determination and grading. The test performance of the insulation structure to be evaluated is compared with the test performance of the reference insulation structure which has been proved by operational experience. GB/T 17948.7-2016 describes the basic test principles for the heat resistance test of rotating electrical insulation structures. Except as otherwise provided in this section In addition, follow the principles of GB/T 17948.7-2016.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 17948.7-2016 General rules for functional evaluation of insulating structures for rotating electrical machines (IEC 60034-18-1.2010, IDT) IEC 60034-1 Rotating electrical machines - Part 1. Quantitative and performance (Rotating electrical machines - Part 1 . Rating Andperformance) IEC 60085 Electrical Insulation Heat Resistance and Representation (ElectricalInsulation-Thermalevaluationanddesig- Nation) Thermal insulation of electrical insulating materials - Part 1 . Assessment of aging procedures and test results (Electrical insulatingmaterials-Propertiesofthermalendurance-Part 1.Ageingproceduresandevaluationof Testresults) Thermal insulation of electrical insulating materials - Part 5. Determination of relative heat index (RTE) of insulating materials [Electricalinsulatingmaterials-Thermalenduranceproperties-Part 5.Determinationofrelative Thermalenduranceindex(RTE)ofaninsulatingmaterial] IEC 60455 (all parts) Resin based reactive active compound for electrical insulation (Resinbasedreactivecompoundsusedfor Electricalinsulation) IEC 60464 (all parts) Varnishes for electrical insulation (Varnishesusedforelectricalinsulation) IEC 60505 Electrical Insulation System Assessment and Identification (Evaluationandqualificationofelectricalinsulationsys- Tems)

3 General

3.1 Reference insulation structure The reference insulation structure described in 4.3 of GB/T 17948.7-2016 shall be tested using the same procedure as the insulation structure to be evaluated. 3.2 Test procedures Each heat aging test usually consists of a series of cycles, each cycle containing a heat aging cycle and subsequent treatment cycles and diagnosis Breaking cycle. According to the type of test, it is divided into five different test procedures, which are described in Chapters 8 to 12. --- Procedure 1. Test procedure for the winding coil (Motorette); --- Procedure 2. Test procedures for the whole machine; --- Procedure 3. Test procedure for stator windings in the groove; --- Procedure 4. Pole winding test procedures; --- Procedure 5. Test procedure for the rotor winding of the groove. The heat aging test procedure consists of several cycles, each cycle including. --- Thermal aging sub-cycle; --- Diagnostic cycle, including sequential mechanical and wet processing and diagnostic voltage testing. In addition to the required tests, other destructive tests can be used.

4 test samples and samples

4.1 Sample structure First screen different insulation materials or components according to the factory screening procedures. These insulation materials or components are used to make the test as described in this section. Any insulation structure assessed by the inspection procedure. Temperature indices of insulating materials can be used, however, they only indicate potential in thermal aging tests Performance cannot be used to determine the heat resistance rating of the insulation structure. See IEC 60085 for the heat rating of electrical insulation structures. In any case, the economics and/or size of the motor should be considered. The actual motor or motor assembly should be used as the test sample. That is Although the length of the groove can be reduced, it is usually necessary to consider the actual clearance and creepage distance of the coil. The test sample can be an actual motor, motor assembly or model. The test model should contain all of the basic components used for the simulated windings and should be extremely similar. Should be used with the expected maximum rated voltage, set Insulation thickness, creepage distance and discharge protection (if necessary) in accordance with standard or actual conditions. For large high-voltage motors, when studying the aging of a part of a coil or wire rod, if a typical influence factor can be applied to the sample, A part of the coil or wire rod is used as a test model. The structure being compared should be consistent with the layout of the actual motor structure. Note. For the same insulation material, depending on the insulation thickness and creepage distance, a very different test life may be obtained. If the test can reliably repeat the stresses experienced during operation of the coil or winding components, a simulation of the coil or winding components can be used Sample. For some special models that have been successfully used, see Appendix A and Appendix B. The manufacturer shall ensure that the materials intended for the new insulation structure do not degrade in the intended production process. 4.2 Determination of changes in minor components of the insulation structure Minor component changes as described in GB/T 17948.7-2016, such as minor changes to the wound windings, may include purchasing technology from new suppliers. Require key materials that have not changed. If the insulation structure changed by the minor component is evaluated and the insulation structure has been evaluated, then A sample can be aged at a temperature point, and the sample should be composed of not less than the recommended number of samples. Simplified assessment of the proven structure should be performed using an aging temperature cycle within the known heat aging data. 4.3 Number of samples The number of samples for each insulation structure should be no less than 5 at each aging temperature, which is the minimum recommended number to meet the statistical confidence. 4.4 Quality Assurance Each insulating material to be used to prepare the sample should be individually tested to determine its consistency prior to preparation of the sample. Quality assurance tests for routine or expected production processes should be performed on each sample. Defective test specimens are removed by visual inspection and subsequent overvoltage test. Overvoltage test shall be carried out with test 1 for manufacturing motors or coils. Or, as specified in the chapter of the diagnostic test, take the larger of the two. Note. If appropriate, other screening (or quality) tests can be used, such as. ---Insulation resistance test; --- loss tangent and capacitance test; ---Partial discharge starting voltage test; --- Phase current balance during operation; --- Repeated impact; ---Leakage current; ---High pressure test. Any sample with a large defect should be discarded or checked for the cause of the deviation, and the tolerance of the deviation should be specified. 4.5 Initial diagnostic test Before the start of the first aging sub-cycle, all selected diagnostic tests should be performed for each complete test to determine if each sample can It is enough to pass the diagnostic test.

5 test procedures

5.1 General principles of diagnostic testing Experience has shown that in many cases sequential mechanical stress tests, moisture exposure and withstand voltage tests are used to assess thermal degradation and thus The best diagnostic test for aging of the insulation structure in which cracks can be generated at the locations where mechanical stress is applied. In other cases, mechanical stress testing, moisture exposure, and withstand voltage testing may not be optimal diagnostic tests, which may be selected from dielectric The test is replaced (for example, partial discharge or dielectric loss) to check the insulation state after each heat aging sub-cycle. The test procedure includes a heat aging test at different aging temperatures to determine the life of the insulation structure at each aging temperature. With these lives Based on life, the life at the temperature level is estimated, which is related to the life of the reference structure at that temperature level. Each aging test is performed periodically, each cycle consisting of a heat aging cycle and a diagnostic cycle. Diagnostic cycle can include machinery Stress tests and moisture exposure tests, and subsequent diagnostic voltage tests and other diagnostic tests. 5.2 Aging temperature and cycle time It is recommended to test the number of samples recommended in this section at least at 3 aging temperatures. The expected heat resistance rating (or grade temperature) of the insulation structure to be evaluated and the known structure of the reference structure shall be selected from Table 1. Table 1 is The heat resistance rating specified in IEC 60085 and IEC 60505. Table 1 Heat resistance grade Heat resistance grade temperature/°C 105(A) 105 120(E) 120 130(B) 130 155(F) 155 180(H) 180 200(N).200 Note. Heat resistance grades 105, 120, and.200 are rarely used in current insulation structures and are therefore not listed in IEC 60034-1. For insulation structures with different heat resistance grades, Table 2 lists the recommended aging temperatures and corresponding exposure weeks for each heat aging cycle. period. In order to make better use of the equipment and to facilitate the test, the temperature and time can be adjusted, but the difference should be considered. The minimum aging temperature selected should be at least 5000h average life, and the maximum temperature should be at least 100h average life. through The minimum aging temperature is often selected according to the exposure period of 28d~35d or longer. In addition, at least two higher aging temperatures should be selected with a temperature difference of 20K or greater. When using more than four aging temperatures For the line test, a temperature difference interval of less than 20K can be used. The maximum temperature should produce an average life of at least 100h. In order to minimize the error caused by extrapolation, the minimum test temperature should not be higher than 25K of the extrapolated temperature. If the expected heat resistance level of the insulation structure to be evaluated is different from the known heat resistance level of the reference insulation structure, it should be selected in an appropriate manner. Aging temperature and aging cycle time. If there is only a small change in the structure to be evaluated and the structure of the determined grade, it can be carried out in accordance with 4.2. For the expected grade temperature, it is recommended to correctly select the fractional length of each aging temperature to produce an average lifetime of about 10 cycles. Table 2 Recommended aging temperature and aging cycle exposure time Expected heat resistance rating 105 120 130 155 180.200 T1 \u003cTA\u003cT2 T1 T2 T1 T2 T1 T2 T1 T2 T1 T2 T1 T2 Each aging score Number of days in the cycle Recommended aging temperature (TA) range/°C 170 180 185 195 195 205 220 230 245 255 265 275 1~2 160 170 175 185 185 195 210 220 235 245 255 265 2~3 150 160 165 175 175 185.200 210 225 235 245 255 4~6 140 150 155 165 165 175 190.200 215 225 235 245 7~10 130 140 145 155 155 165 180 190 205 215 225 235 14~21 120 130 135 145 145 155 170 180 195 205 215 225 28~35 110 120 125 135 135 145 160 170 185 195 205 215 45~60 Note. Table 2 allows the laboratory to select aging time and temperature to optimize manpower and equipment as much as possible, ideally (based on 10K rules) to allow old The temperature is reduced by 10K and the life is doubled. Allows aging tests at lower aging temperatures in multiples of one week (eg 1d, 2d, 4d, 7d, 28d and 49d). The 5d working system is also allowed to perform the aging test. For example, always start aging on Friday and diagnose on Monday. Tests (eg, aging lengths of 3d, 7d, 17d, 31d, and 59d). 5.3 Heating method Despite the obvious drawbacks of ovens, experience has shown that ovens provide a convenient and economical method of heat aging. Should use mandatory Wind oven. The oven method can withstand the full aging temperature for all parts of the insulation structure, while in actual operation most of the insulation is at the hot spot Run at a much lower temperature. At the same time, the insulation accessories may remain decomposed during the aging of the oven, and may be ventilated during actual operation. go. The aging temperature should be controlled and kept constant. The temperature difference is allowed to be ±2K below 180 °C, and the allowable temperature difference is ±3K between 180 °C and 300 °C. The oven heating method is not mandatory. If appropriate, a more straightforward approach that is very close to the simulated operating conditions can be used. --- Direct current heating; ---Positive and reverse test (motor test); --- DC current superimposed on the standard AC current when the motor is running at no load; --- Apply a flexible heater to the sample. 5.4 Heat aging cycle In each cycle, the cold sample (at room temperature) should be placed directly into the preheat oven to subject the sample to the same thermal shock. Similarly, should The hot test sample was directly transferred to room temperature air so that the test piece was subjected to the same thermal shock as when it was heated. It is well known that when the decomposition product remains in contact with the insulating surface, it may accelerate the aging of certain materials while continuously removing the decomposition. It can also accelerate the aging of other materials. For the pending and reference structure, the same oven ventilation conditions should be maintained during thermal aging. If the decomposition product remains in contact with the insulating surface during operation, such as in the case of a completely sealed motor, then the oven ventilation will not These decomposition products are completely removed. Ideally, the concentration of the decomposition product should not change with the aging temperature, but actually the concentration of the test decomposition product is not realistic. The air exchange rate during heat aging should be recorded on the report. Other methods of heating and treating the decomposition products may also be used depending on the test equipment, the type of test sample, and other factors. In addition to thermal aging that is periodically interrupted by diagnostic tests used to monitor thermal degradation, expansion and contraction of the test sample during temperature cycling may also Produces thermal-mechanical degradation of the insulating structure.

6 diagnostic cycle

6.1 Processing order After each heat aging cycle, each sample shall be subjected to mechanical and wet treatment procedures, and subsequent withstand voltage and other diagnostic tests. (if needed). 6.2 Mechanical treatment It is recommended that the mechanical stress be applied to the same mechanical stress as during operation and the highest stress expected during normal operation or The severity of the strain is consistent. The stress application procedure can vary with the type of test and the type of operation expected. A common method of applying mechanical stress is to mount the test piece on a vibrating table, and each test piece is subjected to vibration of 50 Hz or 60 Hz. 1h. Other methods such as repeated shock and deflection can also be used. A start-stop or reverse cycle can also be used as a method of mechanical stress on the actual motor windings, however this may cause mechanical Ageing. It should be considered that the degree of mechanical aging increases as the size of the motor increases. 6.3 Wet treatment In many cases, moisture is considered to be a major cause of changes in electrical insulation properties. Moisture can be induced under electrical stress Different types of insulation failures. Solid insulation absorbs moisture and gradually increases dielectric loss and insulation resistance, and can change electrical strength. Moisture treatment of the insulation enhances the ability to detect insulation cracks and voids during voltage testing. The moisture test is usually performed in the diagnostic sub-cycle. Each sample in the test...

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