GB/T 25389.2-2018 PDF EnglishUS$260.00 · In stock · Download in 9 seconds
GB/T 25389.2-2018: Wind turbines - Permanent magnet synchronous generator - Part 2: Testing methods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 25389.2: Historical versions
Similar standardsGB/T 25389.2-2018: Wind turbines - Permanent magnet synchronous generator - Part 2: Testing methods---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT25389.2-2018GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 27.180 F 11 Replacing GB/T 25389.2-2010 Wind Turbines – Permanent Magnet Synchronous Generator – Part 2.Testing Methods Issued on. MAY 14, 2018 Implemented on. DECEMBER 01, 2018 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 6 4 Test Requirements... 6 5 Test Items... 7 Appendix A (Normative) Measuring of No-load Voltage-Temperature Curve of Generator... 25 Appendix B (Informative) Determination Method of Single-Motor Thermal Test... 261 ScopeThis Part of GB/T 25389 specifies the test methods for permanent magnet synchronous generators for wind turbines connected to the grid through full power converters. This Part applies to the tests of permanent magnet synchronous generators (hereinafter referred to as generators) for wind turbines connected to the grid through full power converters. Other types of generators can be used as a reference.2 Normative ReferencesThe following documents are essential to the application of this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. 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.Tests - Test J and guidance. Mould growth GB/T 2423.17 Environmental testing for electric and electronic products - Part 2.Test method - Test Ka. Salt mist GB/T 4942.1 Degrees of Protection Provided by the Integral Design of Rotating Electrical Machined (IP Code)-Classification3 Terms and DefinitionsFor the purposes of this Document, the terms and definitions given in GB/T 755 and GB/T 1029 apply.4 Test Requirements4.1 Safety measures Since the test process involves dangerous currents, voltages, magnetic fields and mechanical forces, safety precautions shall be taken for all tests; and all tests shall be performed by professionals with relevant qualifications. 4.2 Instruments and meters for measurement The instruments and meters for measurement shall meet the following requirements. 4.3 Preparation for test Before the test, the generator under test shall be in a normal state; the wiring shall be correct; and the test circuit and equipment shall meet the requirements of the test.5 Test Items5.1 Determination of insulation resistance 5.1.1 Determination of insulation resistance of winding against casing, and between windings 5.1.1.3 Measurement method The measurement of the insulation resistance of the winding against the casing shall be carried out in accordance with the provisions of GB/T 1029.The insulation resistance of the stator winding and components shall be measured separately. Before the measurement, the external components shall be reliably disconnected to avoid damage. 5.1.2 Determination of other insulation resistance The methods for measuring other insulation resistances are as follows. 5.1.2.3 of GB/T 1032-2012; 5.2 Measurement of DC resistance of winding in actual cold state 5.3 Interturn withstand voltage test The interturn withstand voltage test shall be carried out according to the methods specified in GB/T 22715, GB/T 22719.1 and GB/T 22719.2. 5.4 Voltage withstand test 5.4.1 Test requirements The withstand voltage test is carried out when the generator is at rest. Before the test, the insulation resistance of the winding shall be measured. If overspeed and short-time overcurrent tests are required, the test shall be performed after these tests. During the type test, the withstand voltage test shall be carried out after the heat test and when the generator is close to the hot state. 5.4.2 Test method The withstand voltage test shall be carried out according to the method specified in GB/T 1029. Other windings and embedded temperature detection components not participating in the test shall be electrically connected to the iron core or the casing, and the casing shall be grounded. If the neutral point of the winding is not easy to separate, the voltage shall be applied to the winding at the same time. 5.5 Phase sequence check 5.5.1 Generator method The motor under test operates as a generator, and the direction of rotation complies with the design provisions. The motor line under test is connected to the phase sequence indicator to determine the phase sequence of the motor under test. 5.5.2 Motor method Use the calibrated power supply to drive the tested motor for motor operation, and the direction of rotation shall comply with the design provisions. 5.9 No-load test 5.9.1 Determination of no-load characteristic curves of generators in cold state and hot state (generator method) 5.10.5 Measurement of cooling medium temperature during heat test 5.10.5.1 Air-cooled motors For motors cooled by ambient air, the embedded temperature detectors or several thermometers distributed in the cooling air to enter the generator can be used for measurement. The thermometer shall be placed 1m~2m away from the generator, and its spherical part (temperature measuring part) shall be on the horizontal plane above the center of the generator shaft; and shall prevent the influence of external radiation heat source and airflow, and take the average value of the temperature value as the cooling medium temperature. 5.17.6 After the generator is reassembled, compare the no-load characteristics with the generator method in 5.9.1. 5.17.7 After the sudden short-circuit test of the generator, the demagnetization of the permanent magnet shall be checked. Tractor Generator 5.18 Determination of starting resistance torque 5.18.1 Disk method A disc with a known diameter is fixedly installed on the shaft extension of the generator; and a force is applied in the tangential direction of the disc. The value of the applied force when the disc starts to rotate is measured by a torque sensor. When the disc is rotated for one circle, the product of the maximum reading and the disc radii is the starting resistance torque. There shall be no less than 3 measuring points within a week. 5.18.2 Leverage method A torque lever is fixedly installed in the vertical direction of the shaft extension of the generator. The end of the lever is connected to a crane connected to a dynamometer or a spring balance. Apply force in the tangential direction until the shaft extension starts to rotate; and read the value of the applied force when it starts to rotate. The product of the maximum reading and the effective length of the lever is the starting resistance torque. 5.19 Casing protection level test The casing protection level test shall be carried out according to the test method specified in GB/T 4942.1. 5.20 Damp heat test The damp heat test shall be carried out according to the test method specified in GB/T 12665. 5.21 Salt spray test The salt spray test shall be carried out according to the test method specified in GB/T 2423.17. 5.22 Mold test The mold test shall be carried out according to the test method specified in GB/T 2423.16.Appendix A(Normative) Measuring of No-load Voltage-Temperature Curve of Generator A.1 Test purpose Measure the relationship curve between permanent magnet and temperature. A.2 Test method The generator is driven by the tractor through the coupling to run at no-load and at the rated speed, and the stator winding is open-circuited. Simulate the winding temperature θ from the cold state of the generator to the stable state of temperature-rise; the temperature is no less than 5 points, including the reference temperature. Use a voltage measuring instrument to measure the m-phase voltage U at the output terminal of the generator; and draw the no-load voltage curve of the generator at different winding temperatures (see Figure A.1). Figure A.1 -- Generator No-Load Potential Curve ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
