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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 1 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 19071.1-2003 Asynchronous generator for wind turbine generator systems - Part 1: Test conditions. The following main technical changes have been made with respect to GB/T 19071.1-2003:
—— the application scope is modified (see Clause 1);
—— the normative references GB/T 1971, GB/T 1032, GB/T 10069.3, and GB/T 20626.1 are added (see Clause 2);
—— the rated power specifications for single-speed generators are added: 50 kW, 100 kW, 800 kW, 1,100 kW, 2,000 kW, 2,500 kW, and 3,000 kW (any special requirements by the users may be negotiated with the manufacturer) (see 3.5);
—— the specifications of "400 V, 1,000V, 1,500V" are deleted for rated power of single-speed generator (see 3.6);
—— the specifications of "660 kW/180 kW, 750 kW/220 kW" are deleted for rated power of double-speed generator; and the specifications of “660 kW/150 kW, 750 kW/200 kW, 1,300 kW/250 kW” are added (see 3.7);
—— the synchronous speed of 1,000 r/min/750 r/min is added for double-speed generator (see 3.8);
—— the slip ratios are deleted for single-speed and double-speed generators (see 3.9 of Edition 2003);
—— the diameter specification and deviation are added for shaft extension without keyway (see 3.9, Table 1);
—— the circular run-out tolerance is modified for the shaft extension (see 3.10 of this standard; and 3.10.3 of Edition 2003);
—— the installation size is added for generators with center heights of 560 and 630 (see 3.11 of this standard; and 3.10.2 of Edition 2003);
—— the minimum ambient air temperature is modified from not less than "-15 ℃" to "-20 ℃", and the requirements are canceled for ambient temperature in cold areas [see 4.2 b) of this standard; and 4.2.2 of Edition 2003];
—— the monthly average minimum temperature corresponding to relative humidity is deleted [see 4.2 c) of this standard; and 4.2.3 of Edition 2003];
—— the provision is added that "efficiency is determined by direct method"; the provision is changed that stray loss is calculated from “0.025 lgPn to 0.005 lgPn” instead of “0.5%” of rated output (see 4.4);
—— the overspeed of generator is changed from “1.2 times rated speed” to “1.2 times maximum operating speed”, and contents is added that any special requirements for overspeed by users may be negotiated with the manufacturer (see 4.8);
—— the requirement is added that when measuring resistance, the selection of tramegger shall meet the requirements of GB/T 1032 (see 4.9);
—— the requirement is added that there shall be no damage between turns after the short-term voltage rising test (see 4.12);
—— the requirement for vibration limits of generators during no-load motor operation is changed from “velocity RMS value shall not exceed 2.8 mm/s” to “according to Table 1 of GB/T 10068-2008”, and the determination and requirements are added for the vibration after overspeed test (see 4.14);
—— the requirement for noise limits of generator is changed from “according to Table 5” to “according to the requirements of GB/T 10069.3” (see 4.15);
—— the requirements is added that the current waveform distortion rate of the generator shall not be greater than 5% (see 4.17);
—— the end-of-manufacturing test items are added such as the “phase sequence inspection of windings”, “locked rotor test at rated frequency”, and “hourly thermal test” (see 6.1.2 of this standard; and 6.2 of Edition 2003);
—— the description is deleted for the specific inspection contents of appearance and mechanical inspection items of generator (see 6.5 of Edition 2003);
—— the type test items are added such as “efficiency determination”, “rotational inertia test”, “determination of distortion rate of current waveform”, and “weighting” (see 6.2.2 of this standard; and 6.4 of Edition 2003);
—— the type test item of the “enclosure protection grade test” is deleted (see 6.2.2 of this standard; and 6.4 of Edition 2003);
—— the environmental and safety requirements are added (see Clause 8);
—— the quality warranty period is added (see Clause 9).
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 19071.1-2003.
Wind turbines - Asynchronous generator - Part 1: Technical conditions
1 Scope
This part of GB/T 19071 specifies the main types, basic parameters and dimensions, technical requirements, test methods, inspection rules, inspection items, marking, packaging, transport and other requirements for asynchronous generators of grid-connected and fixed-speed wind turbines.
This part is applicable to the single-speed or double-speed asynchronous generators (hereinafter referred to as "generators") of grid-connected and fixed-speed wind turbines, and may serve as a reference for 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 191 Packaging - Pictorial marking for handling of goods
GB/T 755 Rotating electrical machines - Rating and performance
GB/T 997-2008 Rotating electrical machines - Classification of types of construction, mounting arrangements and terminal box position for (IM Code)
GB/T 1032 Test procedures for three-phase induction motors
GB/T 1971 Rotating electrical machines - Terminal markings and direction of rotation
GB/T 4942.1-2006 Degrees of protection provided by the integral design of rotating electrical machined (IP code) - Classification
GB/T 10068-2008 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
GB/T 19071.2 Wind turbines - Asynchronous generator - Part 2: Testing methods
GB/T 22714 Test specifications of interturn insulation of form-wound winding for AC low-voltage electrical 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
3 Types, basic parameters, and dimensions
3.1 The protection grade of generator enclosure shall not be inferior to the requirements of IP 44 in GB/T 4942.1-2006.
3.2 The generator shall have a reliable cooling method. If ventilation cooling method is adopted, it shall be ensured that the introduced air shall not cause harm to the generator. If water cooling method is adopted, there shall be no water seepage and leakage problems.
3.3 The structure and installation type of the generator shall meet the requirements of IM B3 in GB/T 997-2008.
3.4 The generator quota is a continuous quota based on the continuous working system (S1).
3.5 Single-speed generators are recommended to be manufactured at the following rated power:
50 kW, 100 kW, 150 kW, 200 kW, 250 kW, 300 kW, 400 kW, 500 kW, 600 kW, 660 kW, 750 kW, 800 kW, 1,000 kW, 1,100 kW, 1,320 kW, 1,500 kW, 2,000 kW, 2,500 kW, and 3,000 kW (any special requirements by users may be negotiated with the manufacturer).
3.6 The rated frequency of the single-speed generator is 50 Hz, the synchronous speed is 1,500 r/min, and the rated voltage is 690 V (any special requirements by users may be negotiated with the manufacturer).
3.7 The double-speed generator shall be manufactured at the following rated power: 600 kW/125 kW, 660 kW/150 kW, 750 kW/200 kW, and 1,300 kW/250 kW (any special requirements by users may be negotiated with the manufacturer).
3.8 The rated frequency of the double-speed generator is 50 Hz, the synchronous speed is 1,500 r/min/1,000 r/min, 1,000r/min/750r/min, and the rated voltage is 690V/690V (any special requirements by users may be negotiated with the manufacturer).
Note: For the double-speed generator power, voltage, speed, slip ratio and other parameters, the expression method is as follows: the parameters before the slash correspond to the high speed state, and the parameters after the slash correspond to the low speed state.
3.9 The dimension and deviation of generator shaft extension (without keyway) shall meet the requirements in Table 1, and the dimension and deviation of generator shaft extension key (with keyway) shall meet the requirements in Table 2 (any special requirements by users may be negotiated with the manufacturer).
Table 1 The dimension and deviation of shaft extension (without keyway)
Shaft extension diameter
mm Deviation
mm
90 0, -0.022
100 0, -0.022
110 0, -0.022
130 0, -0.025
150 0, -0.025
170 0, -0.025
Table 2 The dimension and deviation of shaft extension key (with keyway)
Shaft extension diameter
mm Key width
mm Key height
mm
90
100
110
130
170
3.10 The shaft extension radial circular runout tolerance shall meet the requirements in Table 3.
Table 3 The shaft extension radial circular runout tolerance
Shaft extension diameter
mm Circular runout tolerance
mm
>80~120 0.05
>130 0.06
3.11 The mounting dimension and overall dimension of the generator shall meet the requirements specified in Table 4 and Figure 1 (any special requirements by users may be negotiated with the manufacturer).
Table 4 Frame with footing, mounting type IM B3
Center height Mounting dimension and tolerance/ mm Overall dimension limit/ mm
A B C D E F G H K AB AC AD HD L
Basic dimension Basic dimension Basic dimension Limit deviation Basic dimension Limit deviation Basic dimension Limit deviation Basic dimension Limit deviation Basic dimension Limit deviation Basic dimension Limit deviation Basic dimension Limit deviation
315 508 508 216 ±4.0 90 +0.035
+0.013 170 ±0.57 25 0
-0.052 81 0
-0.2 315 0
-1.0 28 +0.52
0 750 650 580 870 1,340
355 610 630 254 100 210 28 90 355 740 750 680 1,035 1,540
450 800 1,120 355 110 450 35 900 900 760 1,140 2,050
500 900 1,250 475 130 +0.04
0.015 250 32 0
-0.062 119 500 42 +0.62
0 1,050 1,050 970 1,200 2,550
560 1,000 1,400 500 130 250 560 42 1,200 1,200 1,100 1,300 3,020
630 1,120 1,600 530 170 300 ±0.65 40 157 0
-0.3 630 48 1,300 1,300 1,150 1,500 3,100
Note: The limit deviation of the basic dimension D and the basic dimension F are the dimension and deviation of the shaft extension with keyway.
Figure 1
3.12 The parallelism tolerance of the generator axis to the footing supporting surface is 1 mm.
3.13 the flatness tolerance of the generator footing supporting surface is 0.30 mm.
3.14 If the generator shaft extension is equipped with keyway, its symmetry tolerance is 0.05 mm. The coaxiality tolerance of parallel shaft extension is 0.05 mm.
4 Technical requirements
4.1.1 The generator shall meet the requirements of this part, and be fabricated according to the drawings and technical documents approved through established procedures.
4.2 The generator shall be able to operate normally under the following altitude, ambient temperature and relative humidity conditions:
a) the altitude does not exceed 1,000 m;
b) the ambient air temperature is not higher than 40 ℃ and not lower than -20 ℃;
c) the average maximum air relative humidity in the wettest month is not greater than 95%.
If the generator needs to operate under conditions exceeding one or more of the above limits, its special requirements may be negotiated between the user and the manufacturer.
4.3 At rated speed and rated power factor, the generator shall be able to operate normally when the deviation between voltage, frequency and rated value meets the requirements of GB/T 755.
4.4 If the generator is in rated operation, the tolerance of the output rated efficiency and power factor shall meet the requirements of Table 5. The efficiency is measured by direct method or indirect method, and the stray loss is calculated according to the (0.025 lgPn to 0.005 lgPn) of rated output.
Foreword i
1 Scope
2 Normative references
3 Types, basic parameters, and dimensions
4 Technical requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transport and storage
8 Environmental and safety requirements
9 Quality warranty period
