发电机绕组匝间故障检测的新型探测线圈

发布时间：2018-12-25 17:36

【摘要】：为了解决现有检测方法对同步发电机(尤其是应用广泛的汽轮发电机)常见的定子绕组匝间短路和励磁绕组匝间短路故障的局限性,提出了一种新型探测线圈。理论分析表明,由于采用特殊的布置及联接方法,开路的新型探测线圈在电机正常运行或机端外部故障时端口电压为0,而在绕组内部不对称故障时会对气隙磁场的故障附加谐波感应出电动势。而且在定子内部短路与励磁绕组匝间短路故障这两种情况下,新型探测线圈端口电压的频率明显不同。在多相整流实验样机上安装了上述探测线圈,通过实验验证了理论分析的正确性,说明可以根据新型探测线圈端口电压同时反映发电机的定子和转子绕组内部故障、并通过电压频率特征来区分具体的故障类型。
[Abstract]:In order to solve the limitation of the existing detection methods to the common faults of stator winding inter-turn short circuit and excitation winding inter-turn short circuit of synchronous generator, especially the widely used turbogenerator, a new detection coil is proposed. The theoretical analysis shows that because of the special arrangement and connection method, the open circuit detection coil has a port voltage of 0 when the motor is running normally or when the machine is out of order. When the windings are asymmetrical, the electromotive force will be induced by adding harmonics to the fault of the air-gap magnetic field. Moreover, the frequency of the new detection coil port voltage is obviously different from that of the stator internal short-circuit and the inter-turn short-circuit fault of the excitation winding. The detection coil is installed on the experimental prototype of multiphase rectifier. The correctness of the theoretical analysis is verified by experiments. It is shown that the inner faults of the stator and rotor windings of the generator can be reflected simultaneously according to the port voltage of the new detection coil. And through the voltage frequency characteristic to distinguish the specific fault type.
【作者单位】：电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);舰船综合电力技术国防科技重点实验室(海军工程大学);
【基金】：国家自然科学基金项目(51277103) 国家重点基础研究发展计划项目(973计划)(2013CB035601)~~
【分类号】：TM341

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