基于谐波检测的断相保护方法研究  

Open-phase protection method based on harmonic detection

作　　者：高旭彬 GAO Xu-bin(CCTEG Taiyuan Research Institute Co.,Ltd.,Taiyuan 030006,China;National Engineering Laboratory of Coal Mining and Excavation Machinery Equipment,Taiyuan 030006,China)

机构地区：[1]中国煤炭科工集团太原研究院有限公司,山西太原030006 [2]煤矿采掘机械装备国家工程实验室,山西太原030006

出　　处：《煤炭工程》2021年第7期134-138,共5页Coal Engineering

基　　金：山西省科技重大专项项目(20181102027)。

摘　　要：断相故障是导致三相异步电机损坏的主要原因之一,现有断相鉴别方法需要进行复杂的数学运算,数据精度和计算速度受算法性能影响较大。基于此,提出一种根据二次谐波在三相电流包络信号中的占比来鉴别断相故障的新方法。文章分析了典型的断相故障特征,通过傅里叶级数变换,计算出电机对称运行、单相运行、非对称运行状态下二次谐波在三相电流包络信号中的占比,并针对相不平衡工况进行了验证,给出了硬件电路设计原理。实际应用证明,该方法实现简单,对断相故障非常敏感,能够准确识别断相故障,不易受到三相电压幅值不平衡的干扰,适应范围广,为及时、有效地鉴别出断相故障提供了一种新的可行方法。Phase break fault is one of the main causes for three-phase asynchronous motor damage.The existing phase break identification methods require complex mathematical operations,and the data accuracy and calculation speed are greatly affected by the performance of the algorithm.Based on this,a new method is proposed to identify phase-break fault according to the proportion of second harmonic in three-phase current envelope signal.The typical phase-break fault characteristics are analyzed,and the proportion of the second harmonic in the envelope signal of the three-phase current are calculated under the symmetrical operation,single-phase operation and asymmetric operation of the motor by Fourier series transform,and the three-phase unbalanced conditions are verified,also,the design principle of the hardware circuit is given.The practical application shows that this method is simple and sensitive to the phase-break fault.It can accurately identify the phase-break fault.It is not susceptible to the interference of unbalanced three-phase voltage amplitude,and has a wide range of adaptation.It provides a new feasible method for timely and effective identification of phase-break fault.

关 键 词：断相保护 谐波 傅立叶级数 包络信号 

分 类 号：TD608[矿业工程—矿山机电]