GB/T 22720.2-2019 English PDF

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GB/T 22720.2-2019: Rotating electrical machines - Qualification tests for the partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 22720.2-2019	794	Add to Cart	5 days	Rotating electrical machines - Qualification tests for the partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters	Valid

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GB/T 21707   GB/T 22720.1   GB/T 22719.1   GB/T 22715   GB/T 22714   

Basic data

Standard ID: GB/T 22720.2-2019 (GB/T22720.2-2019)
Description (Translated English): Rotating electrical machines - Qualification tests for the partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: K20
Classification of International Standard: 29.160.01
Word Count Estimation: 42,418
Date of Issue: 2019-06-04
Date of Implementation: 2020-01-01
Older Standard (superseded by this standard): GB/Z 22720.2-2013
Quoted Standard: GB/T 17948.7-2016; GB/T 22720.1-2017; IEC 60034-1-2010; IEC 60034-18-31; IEC 60034-18-32; IEC TS 60034-27; IEC TS 61934; IEC 62539
Adopted Standard: IEC 60034-18-42-2017, IDT
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the evaluation criteria for the insulation structure of the stator/rotor windings of single-phase or multi-phase AC motors powered by pulse-width modulated (PWM) frequency converters that generate repetitive impulse voltages and are expected to experience partial discharges during operation. This standard specifies the electrical qualification test of typical samples to verify their matching with voltage-type frequency converters. This standard also specifies a new classification system, which specifies the limit values ??for the reliable performance of the insulating structure under the condition of the power supply of the inverter. Although this standard applies to voltage-type inverters, there are other types of inverters that generate repetitive impulse voltages. For such frequency converters, tests can be carried out in a similar manner. Rotating electrical machines using voltage-type frequency converters only at start-up do not require qualification of their insulation structure and are therefore not covered by this standard

GB/T 22720.2-2019: Rotating electrical machines - Qualification tests for the partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters

---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.
Rotating electrical machines--Qualification tests for the partial discharge resistant electrical insulation systems (Type II) used in rotating electrical machines fed from voltage converters ICS 29.160.01 K20 National Standards of People's Republic of China Replace GB /Z 22720.2-2013 Rotating motor voltage type inverter Rotating electric machine resistant to partial discharge electrical insulation structure (Type II) identification test [IEC 60034-18-42.2017, Rotatingelectricalmachines-Part 18-42. Partial 2019-06-04 released 2020-01-01 implementation State market supervision and administration China National Standardization Administration issued

Content

Foreword III Introduction V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Motor terminal voltage generated when the inverter is running 4 5 Electrical stress of the motor winding insulation structure 7 6 Type II insulation structure voltage rating 10 7 Stress factor 10 of the type II insulation structure supplied by the inverter 8 Identification test 11 9 Identification of main insulation structure 12 10 Identification of turn-to-turn insulation 14 11 Identification of anti-halation structure 16 12 Preparation of test samples 16 13 Identification test procedures 17 14 Qualification Test Qualification Guidelines 18 15 Inspection test 19 16 Optional screening test 19 17 Analysis, reporting and grading 19 Appendix A (informative) Contribution to primary insulation aging 20 Appendix B (informative) Impact Test Circuit Example 23 Appendix C (informative) Derivation of short-term durability test voltage 26 Appendix D (informative) Derivation of the insulation level of the motor insulation impulse voltage 27 Appendix E (Normative) Derivation of IVIC when the manufacturer's baseline life curve is missing 29 Appendix F (informative) Optional screening test 31 Reference 32 Figure 1 Waveform parameters of the impulse voltage 5 Figure 2 Phase-to-phase voltage waveform 6 at a full cycle of the power supply motor of the 3-level inverter Fig. 3 Abrupt voltage (Uj) appearing at the motor end driven by the inverter 6 Fig. 4 The maximum voltage increment of the motor end at infinite impedance as a function of cable length under different impact rise times 7 Figure 5 Example of embedded winding design 8 Figure 6 Forming Winding Design Example 8 Figure 7. The most severe voltages experienced by the inter-turn insulation of different interleaved winding stators as a function of the impact rise time. Figure 8 Example II life curve of type II main insulation structure Figure 9 Example of the turn-to-turn insulation life curve Figure A.1 Schematic diagram of the relative ground voltage of the motor terminal of the 3-level inverter Figure A.2 Lifetime ratio of multiple impact frequency to fundamental frequency versus impulse voltage (Upk/pk) and fundamental frequency (U'pk/pk) Percentage of consumption (Y-axis) (n=10) 22 Figure B.1 Example of a simple inverter output voltage analog circuit 23 Figure B.2 Typical waveform generated by the impact generator 24 Figure B.3 Example of a simple inverter output voltage analog circuit 25 Figure B.4 Typical waveform generated by the impact generator 25 Figure E.1 Main insulation reference life curve 29 Table 1 Example of the characteristic values of the voltage measurement of the two inverters Table 2 Effect of inverter supply voltage characteristics on accelerated aging of different components of type II insulation structure 10 Table A.1 The contribution of the 1 kHz shock to the electrical aging of the 3-level inverter accounts for the percentage of the 50 Hz fundamental frequency voltage aging (durability factor) For 10) 21 Table D.1 Definition of IVIC and test voltage factor for Type II insulation structures 27 Table D.2 Impulse Voltage Insulation Rating (IVIC) 28

Foreword

GB/T 22720 is divided into 2 parts. ---GB/T 22720.1 Rotating motor voltage type inverter-powered rotating electric machine without partial discharge (type I) electrical insulation structure Identification and quality control testing; ---GB/T 22720.2 Rotating electric machine voltage type inverter-powered rotating electric machine resistance to partial discharge electrical insulation structure (type II) Identification test. This part is the second part of GB/T 22720. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB /Z 22720.2-2013 "Rotating motor voltage-type inverter-powered rotating electric machine resistant to partial discharge electrical insulation Structure (Type II) Identification and Accreditation Test. Compared with GB /Z 22720.2-2013, the main technical changes in this section are as follows. --- Revised scope (see Chapter 1, Chapter 1 of the.2013 edition); --- Modified the main insulation sample (see 12.2, 11.3 of the.2013 edition); --- Modified the daytime sample (see 12.3, version 11.2 of the.2013 edition); --- Modified the main insulation identification procedure (see 13.2, 12.3 of the.2013 edition); --- Modified the inter-turn insulation identification procedure (see 13.3, 12.2 of the.2013 edition); --- Modified the anti-halation structure identification procedure (see 13.4, 12.4 of the.2013 edition); --- Revised the qualification criteria for qualification testing (see Chapter 14, Chapter 13 of the.2013 edition); --- Revised the appendix "Example of Impact Test Circuit" (see Appendix B, Appendix A of the.2013 edition); --- Added Appendix D "Derivation of the insulation level of motor insulation impulse voltage" (see Appendix D); --- Added Appendix E "Derivation of IVIC in the absence of a manufacturer's baseline life curve" (see Appendix E). This part uses the translation method equivalent to IEC 60034-18-42.2017 "Rotating Electric Machine Parts 18-42. Voltage Type Inverter Power Supply Rotating electrical machine resistance to partial discharge electrical insulation structure (type II) qualification test. The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. --- GB/T 17948.3-2017 Rotating electrical machine insulation structure functional evaluation forming winding test procedures Edge structure heat assessment and classification (IEC 60034-18-31.2012, IDT) --- GB/T 17948.4-2016 Rotating electrical machines - Insulating structures - Functional assessment Evaluation (IEC 60034-18-32.2010, IDT) --- GB/T 20833.1-2016 Rotating electrical machine rotating machine stator winding insulation - Part 1. (IEC TS60034-27.2006, IDT) ---GB/T 23642-2017 Electrical insulation materials and systems for transient rise and partial discharge under repeated surge voltage conditions (PD) Electrical Measurement (IEC TS61934.2011, IDT) ---GB/T 29310-2012 Guidelines for statistical analysis of electrical insulation breakdown data (IEC 62539.2007, IDT) For ease of use, this section has made the following editorial changes. ---Incorporate the contents of the International Standard Amendment; --- In line with the existing series of standards, this part of the name is changed to "rotary motor voltage type inverter-powered rotary motor resistant to partial discharge Identification test of electrical and electronic insulation structure (type II). 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 Motor System Energy Conservation Engineering Technology Research Center Co., Ltd., Shandong Huali Electric Group Co., Ltd. Division, Wolong Electric Nanyang Explosion Protection Group Co., Ltd., Xi'an Taifu Xima Motor Co., Ltd., Jiangsu Xi'anda Explosion Protection Co., Ltd. Anhui Motor Products and Parts Quality Supervision and Inspection Center, CRRC Zhuzhou Motor Co., Ltd., CRRC Yongji Motor Co., Ltd., Shanghai De Drive Chi Electric Co., Ltd., Harbin Electric Power Equipment Co., Ltd., Beijing Baizheng Chuangyuan Technology Co., Ltd., Hangzhou Jiangchao Motor Co., Ltd. Division, Zhejiang Hulong Technology Co., Ltd., Shanghai Electric Group Shanghai Motor Factory Co., Ltd., Shanghai Electrical Equipment Testing Co., Ltd., Kazakhstan Erbinda Electric Machinery Research Institute. The main drafters of this section. Zhang Shengde, Wang Shuangcan, Wang Qingdong, Wang Jianqiao, Pu Tianqing, Lu Jinsheng, Zhao Yunfeng, Liang Xichuan, Liu Guanfang, Chen Xiangen, Huang Huijie. The previous versions of the standards replaced by this section are. ---GB /Z 22720.2-2013.

Introduction

"Inverter Structure of Rotating Motor Powered by Voltage Type Inverter" consists of two parts, and the insulation structure is divided into two categories. Type I and Type II. Type I, does not withstand partial discharge during its operational lifetime and under specified conditions; Type II, any of the insulating structures throughout the operational life Partially subjected to partial discharge. For Type I and Type II insulation structures, the power system integrator is responsible for coordinating the electrical performance of the complete powertrain system. The motor manufacturer should inform the motor manufacturer of the terminal voltage that occurs during operation. At this time, the motor manufacturer will decide to apply for identification according to the severity. Test of insulation structure. Insulated structure certified by IEC 60034-18-41 or IEC 60034-18-42 and powered by frequency converter The impulse voltage insulation level can be derived. This indicates that the insulation can withstand the electrical stress generated by the inverter during operation. Severe grade base of type I structure Impact rise time and peak-to-peak voltage. On this basis, the severity of the Type II structure is also affected by the surge voltage repetition rate and the fundamental voltage characteristics. Impact. It is recommended that the system integrator measure the phase-to-phase and relative ground voltage between the terminal and the ground after the inverter/motor system is installed. Check if it meets the requirements. 0.1 IEC 60034-18-41 IEC 60034-18-41 discusses Type I insulation structures, which are typically used for rated voltages up to 700V with loose windings The rotating electric machine of the stator. IEC 60034-18-41 gives the necessary normative references, terminology and shadows produced by the operation of the frequency converter ring. After determining the technical basis of the assessment procedure, the conceptual approach and pilot project are described. 0.2 IEC 60034-18-42 IEC 60034-18-42 describes the qualification test for the electrical insulation structure of Type II rotating electrical machines. Type II insulation is usually used for rated electricity A rotating electric machine with a profiled winding of 700V and above. The qualification procedure is completely different from the type I insulation structure, and the procedure is included in the acceleration strip. The test article is destructively aged. Manufacturers need to clarify the life curve of the insulation structure with appropriate calculations and/or test procedures (eg It is described in IEC 60034-18-32 to provide an estimated life under the operating conditions of the frequency converter. Identify any applied anti-fog knots The structure is very important, and the test should be carried out under sinusoidal and repeated impact conditions, respectively. If the insulation structure is proven to be within the specified aging conditions With a reliable life, the insulation structure is approved for use. Rotating motor voltage type inverter Rotating electric machine resistant to partial discharge electrical insulation structure (Type II) identification test

1 Scope

This part of GB/T 22720 specifies the supply of pulse width modulation (PWM) inverters that generate repeated surge voltages and during operation. Evaluation criteria for stator/rotor winding insulation structures for single or multiphase AC motors subject to partial discharge. This section specifies a typical test An electrical qualification test to verify the match with a voltage-type inverter. This section also describes the new rating system, which is a hierarchical system. It specifies the limit of reliability of the insulation structure under the power supply conditions of the inverter. Although this section applies to voltage-type inverters, there are other types of inverters that generate repeated surge voltages. For this type of change The frequency converter can be tested in a similar manner. Rotating motors that use voltage-type inverters only at start-up do not need to identify their insulation structure and are therefore outside the scope of this section.

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 the functional evaluation of insulating structures for rotating electrical machines (IEC 60034-18-1.2010, IDT) GB/T 22720.1-2017 Rotating electric machine voltage type inverter-powered rotating electric machine without partial discharge (type I) electrical insulation junction Identification and quality control tests (IEC 60034-18-41.2014, IDT) IEC 60034-1.2010 Rotating electrical machines - Part 1. Quantitative and performance (Rotating electrical machines - Part 1 Ratingandperformance) Rotating electrical machines - Part 18-31. Functional evaluation of insulating structures Thermal evaluation and classification of mechanical insulation structures (Rotating electricalal machines-Part 18-31. Functionalevaluationof insulationsystems-Testproceduresforform-woundwindings-Thermalevaluationandclassification Ofinsulationsystemsusedinrotatingmachines) Rotating electrical machines - Part 18-32. Functional evaluation of insulating structures - s (Rotatingelectricalmachines-Part 18-32. Functionalevaluationofinsulationsystems-Testproce- Duresforform-woundwindings-Evaluationbyelectricalendurance) IEC TS60034-27 Rotating electrical machines - Part 27. s. lectricalmachines-Part 27.Off-linepartialdischargemeasurementsonthestatorwindinginsulation Ofrotatingelectricalmachines) IEC TS61934 Electrical Insulation Materials and Systems Partial Discharge (PD) Electrical Measurements with Instantaneous Rise and Repeated Impulse Voltage Conditions Quantity [Electricalinsulatingmaterialsandsystems-Electricalmeasurementofpartialdischarges(PD) Undershortrisetimeandrepetitivevoltageimpulses] IEC 62539 Guidelines for the statistical analysis of electrical insulation breakdown data (Guideforthestatisticalanalysisofelecintricalsu- Relationbreakdowndata) ......

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