Development and Evaluation of Low Volatile Insulation System for a Large Permanent Magnet Direct-drive Wind Turbine Generator
In the VPI process,the traditional wind turbine insulation system will produce more volatile emissions,which greatly pollutes the environment.It is urgent to develop a low volatile insulation system in the production process to solve the air pollution problem on the premise of meeting the high reliability requirements of wind power.Through the analysis of the full operating conditions and design boundary of the wind turbine generator unit,the stress factors have been screened and investigated in a full range.The key influence factors and deterioration parameter levels have been determined from the four types of stress of TEAM,and the key influence stress factors are thermal mechanical stress and moisture stress.Then the simulation test procedure has been conceived and designed.Conduct parallel comparison test has been carried out between the newly developed insulation system and the benchmark insulation system that has been in operation for more than 10 years.The comparison results are used as the basis for horizontal judgment,and the lowest absolute value index is set as the longitudinal performance standard.After the local model of the low volatile insulation system has undergone 12 cycles of cold and hot shock and immersion tests,its electrical performance and process matching are evaluated.It is concluded that the insulation system can withstand thermal mechanical stress and wet stress,and the electrical insulation performance under this stress and thermal environment is equivalent to or even better than that of the reference insulation structure.
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