Wind engine quality appraisal

wind engine is based on the principles of electromagnetic induction and aerodynamics. It captures wind energy through the impeller to drive the rotation of the generator rotor to achieve efficient conversion of mechanical energy into electrical energy. It is widely used in onshore wind power, offshore wind power and distributed energy systems. Its typical applications include large-scale wind farm power generation, remote area power supply and energy storage system support. Compared with traditional thermal power generation equipment, wind turbines are clean, renewable, highly reliable, and intelligently connected to the grid. They are the core equipment for achieving the "double carbon" goal.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide wind engine quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for wind engine quality appraisal.

With the rapid growth of wind power installed capacity, the number of wind engine quality disputes has gradually increased. The judicial dispute focuses on:

1. Dispute over performance indicators: whether the actual power generation reaches the standard and whether the power generation efficiency meets the design value;

2. Material defects: the strength of the blade composite material is not enough The bearing material has poor fatigue resistance;

3. Process problems: the welds are not fused and the coating thickness is insufficient, leading to corrosion;

4. Contract performance problems: the delivered equipment does not comply with the technical agreement.

1. On-site investigation

Check the installation status, environmental factors, operating records, etc. of the wind turbine.

detects wind engine related parameters, such as wind speed, wind direction, voltage, current, etc.

2. Material inspection

conducts composition analysis, mechanical property testing, etc. of materials used in wind turbines.

0Check the electrical system of the wind turbine, including generators, transformers, cables, etc.

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2 tests wind engine power generation efficiency, voltage stability, harmonic content and other indicators.

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The applicant, a wind power company, signed a "Wind Engine Procurement Contract" with an equipment manufacturer, the respondent, agreeing to purchase 15 3MW direct-drive engines. After being put into operation, many engines developed blade cracks and insufficient power generation (actually measured 85% of the rated value). The wind power company believed that the equipment had quality defects and demanded compensation for losses. The manufacturer argued that the problem was caused by insufficient wind speed, and the parties went to court.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "wind engine", contract technical agreement, on-site investigation case materials and other data, and made the following quality analysis opinions:

The carbon fiber content of the blades of the wind engine involved is only 35% (the contract requires 40%), and the tensile strength is only 1800MPa (standard ≥2000MPa); the generator stator winding insulation material is grade F (contract requires grade H), which has insufficient temperature resistance. The unfusion depth of the blade main beam and flange weld reached 3 mm (standard ≤ 1 mm), and the flaw detection pass rate was only 85%; the coating thickness was only 100 μm (standard ≥ 150 μm), and red rust appeared after 1,000 hours of salt spray testing.

The manufacturer failed to provide the specified carbon fiber content blades and H-class insulation materials according to the contract, and the process control was not up to standard, resulting in equipment problems.

The wind engine quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).