CAJ | 학술논문

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。
위료해결현유검측방법대동보발전궤(우기시응용엄범적기륜발전궤)상견적정자요조잡간단로화려자요조잡간단로고장적국한성，제출료일충신형탐측선권。이론분석표명，유우채용특수적포치급련접방법，개로적신형탐측선권재전궤정상운행혹궤단외부고장시단구전압위0，이재요조내부불대칭고장시회대기극자장적고장부가해파감응출전동세。이차재정자내부단로여려자요조잡간단로고장저량충정황하，신형탐측선권단구전압적빈솔명현불동。재다상정류실험양궤상안장료상술탐측선권，통과실험험증료이론분석적정학성，설명가이근거신형탐측선권단구전압동시반영발전궤적정자화전자요조내부고장、병통과전압빈솔특정래구분구체적고장류형。
Concerning the limitation of the available detection methods for the common inter-turn short circuits in stator and field windings of synchronous generators, especially in the common turbo-generators, this paper puts forward a new type of air-gap search coils. Theoretical analysis shows that the open-circuit voltage of the novel search coil is zero under normal operation or external short circuits at machine terminals, for the special distribution and connection pattern. While asymmetrical faults occur in the windings, AC EMF could be induced in the search coils by the additional space harmonics of air-gap magnetic field, which do not exist under normal conditions. What’s more, in case of stator internal short circuits and field inter-turn short circuits, the open-circuit voltages of the search coils are obviously different in frequency. A series of experiments on a poly-phase model machine with rectifier load systems, where the novel search coils are installed, verifies the correctness of the theoretical analysis on the search coils. It is feasible to detect both the stator internal faults and the field inter-turn faults in generators according to the open-circuit voltages of the search coils, and distinguish them from each other by the voltage frequency.