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GB/T 25389 consists of two parts under the general title Wind turbines - Permanent magnet synchronous generator:
——Part 1: Technical conditions;
——Part 2: Testing methods.
This is Part 2 of GB/T 25389.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 25389.2-2010 Wind turbine low-speed permanent magnet synchronous generator - Part 2: Testing methods. The following main technical changes have been made with respect to GB/T 25389.2-2010:
——In the standard name, "low-speed permanent magnet synchronous generator" is changed to "permanent magnet synchronous generator";
——The voltage specification range of tramegger is modified (see 5.1.1.2);
——The requirements for measuring absorption ratio and polarization index are added (see 5.1.1.3);
——The testing method for interturn impulse withstand voltage of winding is carried out according to the relevant current national standards (see 5.3);
——The requirement of "measuring vibration velocity, acceleration and double amplitude with low-frequency vibration testing instrument" is deleted, and the requirement for speed during vibration test is added (see 5.5 of Edition 2010);
——The requirements for "phase sequence inspection" are added (see 5.5);
——The measurement of no-load voltage-temperature curve of generator is added (see 5.9.1.3 and Annex A);
——The requirements for "overcurrent test” are deleted (see 5.11 of Edition 2010);
——The subclauses such as "purpose" and "general description" of thermal test are added (see 5.10.1 and 5.10.2);
——The measurement of the coolant temperature of "electrical machine with outer cooler" and "electrical machine with inner cooler" is added (see 5.10.5.2 and 5.10.5.3);
——Provisions on the position of thermometer during determination of sliding bearing are added (see 5.10.6, and 5.14.5 of Edition 2010);
——The direct load method for thermal test is modified (see 5.10.7.1, and 5.14.2 of Edition 2010);
——The single-winding thermal test method is added (see 5.10.7.2 and Annex B);
——The time interval corresponding to the rated output after the generator is rested and de-energized (see 5.10.8, and 5.14.6 of Edition 2010);
——A clause for correction of the temperature rise in generator winding is added (see 5.10.10);
——The generator voltage regulation is deleted (see 5.17 of Edition 2010);
——The names of two methods for measuring starting resistance moment are added (see 5.18);
——The testing method for the "determination of shaft voltage" is deleted (see 5.22 of Edition 2010).
This part was proposed by China Machinery Industry Federation.
This part is under the jurisdiction of SAC/TC 50 National Technical Committee on Wind Power Machinery of Standardization Administration of China.
Drafting organizations of this part: Xiangtan Electric Manufacturing Co.,Ltd., XEMC Windpower Co. Ltd., Xi'an DunAn Electric Co., Ltd., Xiangtan Traction Electrical Equipment Research Institute Co., Ltd., National Quality Supervision and Inspection Center for Industrial and Mining Electric Drive Vehicles (Hunan), China Machinery International Engineering Design and Research Institute Co., Ltd., CRRC Yongji Electric Co., Ltd., Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd., Guodian United Power Technology Company Limited, Tsinghua University, National Rare Earth Permanent Magnet Motor Engineering Technology Research Center, Shenyang University of Technology, and International Copper Association Ltd., China.
Chief drafters of this part: Zhu Liang, Yu Lihua, Bi Jianhong, Liang Xiaobo, Li Suping, Guo Dengta, Li Chunlin, Liu Guoping, Chen Yuezhi, Chen Zhanlei, Zhu Guanghui, Zeng Liying, Yuan Kainan, Wang Jianfeng, Yu Wenbin, Zhang Shifu, Yu Bing, Chai Jianyun, Tang Renyuan, An Zhongliang, and Wang Dagang.
The previous edition of this part is as follows:
——GB/T 25389.2-2010.
Wind turbines - Permanent magnet synchronous generator - Part 2: Testing methods
1 Scope
This part of GB/T 25389 specifies the testing methods for permanent magnet synchronous generators for wind turbines connected to the grid via full-power converters.
This part is applicable to the test of permanent magnet synchronous generators (hereinafter referred to as generators) for wind turbines connected to the grid via full-power converters, and may be referred to by other types of generators.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 755 Rotating electrical machines - Rating and performance
GB/T 1029 Test procedures for three-phase synchronous machines
GB/T 1032-2012 Test procedures for three-phase induction motors
GB/T 2423.16 Environmental testing for electric and electronic products - Part 2: Test methods - Test J and guidance: Mold growth
GB/T 2423.17 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist
GB/T 4942.1 Degrees of protection provided by the integral design of rotating electrical machines (IP code) - Classification
GB/T 10068 Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration severity
GB/T 10069.1 Measurement of the airborne noise emitted by rotating electrical machines and the noise limits - Part 1: Method for the measurement of airborne noise emitted by rotating electrical machines
GB/T 12665 Requirements of damp-heat testing of electrical machine for service in general environmental condition
GB/T 22715 Impulse voltage withstand levels of form-wound stator coils for rotating a.c. machines
GB/T 22719.1 Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 1: Test methods
GB/T 22719.2 Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 2: Test limits
GB/T 25389.1 Wind turbines - Permanent magnet synchronous generator - Part 1: Technical conditions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 755 and GB/T 1029 apply.
4 Test requirements
4.1 Safety measures
As dangerous currents, voltages, magnetic fields and mechanical forces are involved in the test, safety precautions shall be taken for all tests, and all tests shall be conducted by qualified professionals.
4.2 Measuring apparatuses and meters
The measuring apparatuses and meters shall meet the following requirements:
a) all the measuring apparatuses and meters and sensors used during test shall pass the verification by the metrological service and shall be within the validity period.
b) during the test, the accuracy shall not be inferior to Grade 0.5 for electrical measuring meters (except tramegger), Grade 0.2 for electric quantity sensor, Grade 0.5 for electric quantity transmitter, Grade 1.0 for tachometer and Grade 1.0 for dynamometer (except hanging spring scale), the error of thermometer shall be ±1℃, and other measuring apparatuses and meters shall meet the requirements of relevant standards.
c) when a converter is used as the test power supply, its input and output ends shall be provided with broadband digital measuring instruments and it shall meet the accuracy requirements within the frequency range to be measured.
4.3 Test preparation
Before the test, the tested generator shall be in a normal state with correct wiring, and the test circuits and equipment shall meet the test requirements.
5 Test items
5.1 Determination of insulation resistance
5.1.1 Determination of the insulation resistance between winding and housing and between windings
5.1.1.1 Generator state during measurement
The measurement of the insulation resistance of generator winding shall be conducted respectively at the actual cold state and hot state of the generator (or after the thermal test);
During the inspection test, unless otherwise specified, the measurement of the insulation resistance between winding and housing and between winding shall be conducted only at the cold state; During the measurement of insulation resistance, the winding temperature shall be measured, but the temperature of the surrounding medium may be taken as the winding temperature when measuring at the actual cold state.
5.1.1.2 Selection of tramegger
For the measurement of the insulation resistance between winding and housing and between windings, tramegger shall be selected according to Table 1 on the basis of the rated voltage of the tested winding.
Table 1
Rated voltage of tested winding /V Tramegger specification /V
UN≤1,000 500
1,00012,000 10,000
5.1.1.3 Measurement method
The insulation resistance between winding and housing shall be measured in accordance with those specified in GB/T 1029. The insulation resistance of stator winding and components shall be measured separately. External components shall be reliably disconnected before measurement to avoid damage.
If the absorption ratio is measured, the insulation resistance values at the time of 15s and 60s shall be measured to obtain the absorption ratio R60/R15.
If the polarization index is measured, the insulation resistance values at the time of 1min and 10min shall be measured to obtain the polarization index R10/R1.
5.1.2 Determination of other insulation resistance
The determination methods for other insulation resistance are as follows:
a) the insulation resistance of the heater is measured according to the method specified in GB/T 1032-2012, 5.1.2.3;
b) the insulation resistance of the buried temperature detector is measured according to the method specified in GB/T 1032-2012, 5.1.2.2;
c) when the bearing is of insulation structure, the insulation resistance of the bearing shall be measured with a tramegger not higher than 1,000V.
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Test requirements
4.1 Safety measures
4.2 Measuring apparatuses and meters
4.3 Test preparation
5 Test items
5.1 Determination of insulation resistance
5.2 Determination of the DC resistance of winding at actual cold state
5.3 Interturn withstand voltage test
5.4 Withstand voltage test
5.5 Phase sequence inspection
5.6 Vibration measurement
5.7 Noise measurement
5.8 Determination of voltage tolerance for the generator
5.9 No-load test
5.10 Thermal test
5.11 Overload test
5.12 Efficiency determination
5.13 Generator power characteristic test
5.14 Determination of waveform distortion factor
5.15 Overspeed test
5.16 Steady state short-circuit test
5.17 Sudden short-circuit test
5.18 Determination of starting resistance torque
5.19 Test for enclosure protection degree
5.20 Damp heat test
5.21 Salt mist test
5.22 Mold test
Annex A (Normative) Measurement of no-load voltage-temperature curve of generator
Annex B (Informative) Determination of single machine thermal test
