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GB/T 19071 consists of two parts under the general title Wind turbines - Asynchronous generator:
——Part 1: Technical conditions;
——Part 2: Testing methods.
This is Part 2 of GB/T 19071.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 19071.2-2003 Asynchronous generator for wind turbine generator systems - Part 2: Test method.
In addition to editorial changes, the following main technical changes have been made with respect to GB/T 19071.2-2003.
——the application scope is modified (see Clause 1);
——normative reference GB/T 1029 is added (see Clause 2);
——content is added for safety measures in test (see 3.1);
——requirements are added for testing instruments (see 3.2);
——requirements are added for appearance and mechanical inspection (see 4.1);
——the provision is added that "the difference between the average value of the three-phase resistances shall not be greater than 2% of the average value" (see 4.3);
——phase sequence inspection requirements are added for windings (see 4.4);
——the provision is deleted that “the difference between the average temperature rise calculated by the thermal resistance method and the hottest temperature rise measured by the temperature measuring component shall not exceed 10 K” (see 4.6 of this standard; and 4.4 of Edition 2003);
——the reference working temperature is added for “different insulation thermal grades (A, E, B, H)” (see Table 1 of this standard; and 4.5.4.1 of Edition 2003);
——the calculation formula is modified for stray loss (see 4.7.4.3 of this standard; and 4.5.4.3 of Edition 2003);
——the overspeed test rotating speed is modified from 1.2 times the rated rotating speed to 1.2 times the maximum operating speed (see 4.9 of this standard; and 4.7 of Edition 2003);
——the method is added for the locked-rotor test at rated frequency (see 4.13);
——the overload test method is added (see 4.14);
——the determination of aberration rate of current waveform is added (see 4.15);
——the standard is modified for salt spray test method (see 4.20 of this standard; and 4.15 of Edition 2003);
——the standard is modified for the mold test method (see 4.21 of this standard; and 4.16 of Edition 2003);
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Technical Committee 50 on Wind Power Machinery of Standardization Administration of China.
The previous edition replaced by this part is as follows:
——GB/T 19071.2-2003.
Wind turbines - Asynchronous generator - Part 2: Testing methods
1 Scope
This part of GB/T 19071 specifies the test methods for asynchronous generators of grid-connected and fixed-speed wind turbines.
This part is applicable to the performance tests of single-speed or double-speed asynchronous generators (hereinafter referred to as "generators") of grid-connected and fixed-speed wind turbines.
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 1029 Test procedures for three-phase synchronous machines
GB/T 1032 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 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 10069.3 Measurement of airborne noise emitted by rotating electrical machines and the noise limits - Part 3: Noise limits
GB/T 12665 Requirements of damp-heat testing of electrical machine for service in general environmental condition
3 Test requirements and preparation
3.1 Safety measures
As dangerous voltages, currents and mechanical forces are involved in the test, safe and effective preventive measures shall be taken during the test, and all tests shall be conducted by personnel with relevant knowledge and experience.
3.2 Instruments and meters for testing
3.2.1 The instruments, meters and sensors used for testing shall be qualified upon metrology organization and used within the validity period.
3.2.2 The accuracy shall not be inferior to Grade 0.5 for electrical measuring meters used in the test (except tramegger), shall not be inferior to Grade 0.2 for electric quantity sensor, and Grade 0.5 for electric quantity transmitter. The reading error of speed recorder shall be within ±1 r/min, (the accuracy shall not be inferior to Grade 1.0), the error of thermometer shall be less than ± 1℃, the accuracy of bridge or digital micro-meter shall not be inferior to Grade 0.2, and other measuring instruments and meters shall meet the requirements of relevant standards.
3.3 Measurement requirements
Measurement shall meet the requirements of GB/T 1032.
3.4 Test preparation
3.4.1 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.
3.4.2 The test power supply shall meet the requirements of GB/T 1032.
4 Test items and methods
4.1 Appearance and mechanical inspection
4.1.1 The generator surface paint shall be dry, complete and uniform, without defacement, collision, crack phenomenon.
4.1.2 When the rotor is rotated, it shall be smooth and flexible, free of idle delay and abnormal noise.
4.2 Determination of insulation resistance
The state of the generator during measurement, the selection of meters and the measurement method shall meet the requirements of GB/T 1032. For double-winding generators, the insulation resistance between each set of winding and the enclosure and between the windings shall be respectively measured.
4.3 Determination of DC resistance of windings in actual cold state
The DC resistance of windings in actual cold state shall be determined according to GB/T 1032, and the difference between the average value of the three-phase resistances shall not be greater than 2% of the average value.
4.4 Phase sequence inspection of windings
The rotation direction of the generator shall meet the requirements, and the sign sequence of the outgoing line end and the phase sequence of the terminal voltage shall be in the same direction.
4.5 Determination of no-load current and no-load loss
4.5.1 Schematic diagram for test circuit and requirements for circuit equipment
See Figure 1 for the schematic diagram for test circuit.
Foreword i
1 Scope
2 Normative references
3 Test requirements and preparation
3.1 Safety measures
3.2 Instruments and meters for testing
3.3 Measurement requirements
3.4 Test preparation
4 Test items and methods
4.1 Appearance and mechanical inspection
4.2 Determination of insulation resistance
4.3 Determination of DC resistance of windings in actual cold state
4.4 Phase sequence inspection of windings
4.5 Determination of no-load current and no-load loss
4.6 Thermal test
4.7 Load characteristic test
4.8 Determination of maximum torque
4.9 Overspeed test
4.10 Determination of vibration
4.11 Determination of noise
4.12 Short-time voltage rising test
4.13 Locked rotor test at rated frequency
4.14 Overload test
4.15 Determination of distortion rate of current waveform
4.16 Voltage withstand test
4.17 Rotational inertia test
4.18 Enclosure protection grade test
4.19 Cyclic damp heat test
4.20 Salt spray test
4.21 Mold test
