针对某电厂QF R-135-2型135 M W空冷发电机在长期运行中出现的定子绕组绝缘磨损、槽楔松动和铁心过热等故障,开展了定子结构优化改造方案研究。通过定子线圈结构改进、定子铁心发热点修复、定子槽楔结构改进和定子绕组端部支撑结构改进...针对某电厂QF R-135-2型135 M W空冷发电机在长期运行中出现的定子绕组绝缘磨损、槽楔松动和铁心过热等故障,开展了定子结构优化改造方案研究。通过定子线圈结构改进、定子铁心发热点修复、定子槽楔结构改进和定子绕组端部支撑结构改进,对发电机进行了改造。改造后,机组满负荷运行时的定子层间温度平均下降约10℃,端部模态频率有效避开了工频和倍频共振区间,相关电气试验结果均合格。由此表明,改造后发电机发热量下降,显著提升了机组的运行安全性和可靠性。展开更多
The anti-overturning ability and structure safety of jack-up unit in in-place condition are often affected by environment loads, especially wind load. According to the MODU rule, the projected area method is used for ...The anti-overturning ability and structure safety of jack-up unit in in-place condition are often affected by environment loads, especially wind load. According to the MODU rule, the projected area method is used for calculating the wind load. However, the calculated results are conservative and not good for structure optimization design. In this paper, a 400 ft jack-up is studied as an example. Based on the wind tunnel test and numerical simulation method, some key points of wind load calculation, such as shielding effect, lift effect and shape coefficient of component, are discussed. The study shows that the points mentioned above, which are ignored in the MODU rule calculation, result in the conservative result.展开更多
文摘针对某电厂QF R-135-2型135 M W空冷发电机在长期运行中出现的定子绕组绝缘磨损、槽楔松动和铁心过热等故障,开展了定子结构优化改造方案研究。通过定子线圈结构改进、定子铁心发热点修复、定子槽楔结构改进和定子绕组端部支撑结构改进,对发电机进行了改造。改造后,机组满负荷运行时的定子层间温度平均下降约10℃,端部模态频率有效避开了工频和倍频共振区间,相关电气试验结果均合格。由此表明,改造后发电机发热量下降,显著提升了机组的运行安全性和可靠性。
基金supported by the National Natural Science Foundation of China(Grant No.51079034)the Fundamental Research Funds for the Central Universities(Grant No.HEUCFR1003)
文摘The anti-overturning ability and structure safety of jack-up unit in in-place condition are often affected by environment loads, especially wind load. According to the MODU rule, the projected area method is used for calculating the wind load. However, the calculated results are conservative and not good for structure optimization design. In this paper, a 400 ft jack-up is studied as an example. Based on the wind tunnel test and numerical simulation method, some key points of wind load calculation, such as shielding effect, lift effect and shape coefficient of component, are discussed. The study shows that the points mentioned above, which are ignored in the MODU rule calculation, result in the conservative result.
