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机组在运行中,因受到各种因素的长期作用,其定子端接头绝缘的电气和机械强度将逐渐降低,加上厂家制造工艺或定子绕组现场下线工艺的原因,不可避免地会发生种种绝缘故障,而且这种现象带有一定的普遍性。为此,从实例出发,分析影响水轮机组发电机端接头绝缘的主要因素,并提出解决类似机组定子绕组端接头绝缘薄弱环节的试验检查和处理方法。 相似文献
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电机定子绕组匝间是指电机同一相的线圈绕组匝之间的绝缘,由于绝缘结构和绝缘材料不同以及在绕线、嵌线、刮线接头、端部整形、绝缘浸漆、装配等工序中因操作工艺不当而引起不同程度的绝缘损伤并在绕组通电后产生短路的现象。绕组匝间短路将导致定子电流急剧增大,进而烧毁电机绕组。因此必须高度重视定子绕组匝间问题,及时查找原因,采取预防措施,避免事故发生。 相似文献
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发电机定子绕组对发电机寿命有直接影响,同时是关系到发电机能否在额定电压下长期正常运行的一个重要因素。定子绕组端部的环氧树脂接头具有耐潮性好,老化慢,电气、机械及热性能佳的特点,允许工作温度为130℃。由于环氧树脂接头及引出线绝缘是下线后包扎的,绝缘的整体性与槽部对地绝缘相比,有较大的差距;制造工艺不稳定也比较容易使该部分绝缘质量下降。 相似文献
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叙述了600MW发电机定子端部连接大锥环的绝缘螺杆,固定成型支架的绝缘螺杆和螺母的锁紧胶粘剂的合理选用,以增加发电机定子端部固定件之间的锁紧力。 相似文献
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水轮发电机定子端部绝缘盒击穿的原因及处理 总被引:1,自引:0,他引:1
叙述了运用行业标准DL/T596-1996中关于汽轮发电机定子端部手包绝缘的试验方法,有效地检出水轮发电机定子并头套故障绝缘盒;并介绍了处理、改进端部故障绝缘盒的成功经验,可为现场同类检修提供参考。 相似文献
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l定子绕组端部绝缘事故频发 近年来,国产200MW及以上水氢氢发电机频繁发生定子绕组短路事故。根据这些事故的资料分析,发现短路故障的主要原因是绕组绝缘施工与端部固定工艺不严格、线棒焊接工艺不良等,其中以手包绝缘整体性差,鼻端绝缘盒内未填满,线棒主绝缘及绝缘引出管连接处的绝缘处理不当等问题尤为突出,当发电机膛内湿度大时易造成事故。 相似文献
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叙述了1号发电机中绝缘盒存在的问题。借鉴汽轮发电机上用来检查端涪手包绝缘质量试验方法,成功地检查出了1号发电机定子端部不合格的绝缘盒,消除了定子端部绝缘隐患。 相似文献
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Komaba T. Kanai K. Yoshida S. Shigetoshi I. Amano K. 《Power Delivery, IEEE Transactions on》1992,7(4):1706-1712
The authors have developed a flexible dimensionally flush joint for 500 kV aluminum-sheathed oil-filled cables with handling characteristics similar to the cable itself so that it may be readily drawn into ducts in the same way as the cable without suffering damage. The process and characteristics are outlined. This joint is intended for use at intermediate points on long bridges or tunnels where local assembly and installation of conventional joints would be difficult. In developing the joint, various novel techniques have been used, including the flexible flush jointing of segmental conductors, the flexible jointing of paper insulation by a combination of wrapping-back and stepping methods, and on-site aluminum sheath corrugating and sealing methods 相似文献
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Yanpeng Hao Guoli Wang Zhidong Jia Hengkun Xie 《Dielectrics and Electrical Insulation, IEEE Transactions on》2005,12(1):104-113
It is a challenge to diagnose insulation condition of stator bars using an ultrasonic technique, due to the complex structures of the stator bars and the high attenuation of the stator insulation. In this paper, five low frequency transducers were used in a pulse-echo configuration to try to test a standby stator bar of a generator (300 MW, 18 kV). With an available transducer, four types of insulation structures were tested on the stator bar. The short side insulation was compared with the large one of the stator bar in the slot. The stator bar near the exit from the slot and the end stator bar, were compared with the stator bar in the slot. The semiconductive coating covered stator insulation was compared with the uncoated one. The stator insulation having an insulation-copper interface was compared with that having an insulation-gas interface. In addition, insulation diagnosis tests in the laboratory were performed on two sets of stator bars, which had been in service for 18 and 23 years, respectively in two generators (300 MW, 18 kV). Field tests were performed on the stator bars near the exit from the slot and the end stator bars of a generator (300 MW, 18 kV). The experimental results demonstrated an availability of low frequency ultrasonic pulse-echo method for insulation condition diagnosis of large generators 相似文献
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西柏坡发电厂300MW汽轮发电机定子线圈绝缘磨损严重,通过对其端部线圈振动固有特性的测试与分析,找到绝缘磨损的原因,并采取加固措施。 相似文献
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该文叙述了上海汽轮发电机有限公司首台 6 0 0 MW汽轮发电机的绝缘材料及绝缘结构 ,包括定子线圈的电磁线和线圈主绝缘、防晕结构 ,端部绝缘及固定件 ,转子线圈匝间绝缘、对地绝缘 (槽绝缘 )、引线绝缘 (径向和轴向导电螺杆绝缘 )等问题的研究。 相似文献
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为探索结构复杂的脐带缆中电场分布与绝缘厚度是否合理,在传统解析计算的基础上利用有限元法对脐带缆进行分析,建立脐带缆端面的二维模型,选择仿真软件ANSYS对其电场进行分析,并对比不同绝缘材料、不同绝缘层厚度以及不同脐带缆端面结构对电场分布带来的影响,得到了绝缘厚度的计算方法.实践验证,该算法能够确定复杂截面结构的电力电缆绝缘厚度. 相似文献
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文章介绍了某工程600MW发电机组的定子绕组绝缘破坏及接地事故,检查和认定了发电机的故障情况及故障部位,分析发生故障的主要原因是汽端和励端内冷水回水管管径不合适,冷却水流量不够而导致局部过热,烧坏绝缘。简要介绍了故障的处理措施及应吸取的经验教训。 相似文献