基于时频维数的10kV电缆故障诊断

Diagnosis of 10 kV Cable Fault Based on the Time-Frequency Dimension

10 kV 电缆故障信号具有非平稳性和非线性的特征,当前故障诊断方法无法精细刻画和准确提取电缆故障信号的内在特征信息,导致得到的诊断结果不准确,为此,提出一种基于时频维数的10 kV 电缆故障诊断方法,分析了广义维数法,将时域信号扩展至时频域信号对电缆信号进行研究,给出了电缆故障信号在时频平面上的广义维数覆盖方法的数值算法,通过时频域广义维数法对10 kV 电缆故障信号进行特征分析,针对任意待诊断电缆信号,通过对其模式特征和已构建的样本数据库的对比,即可识别出该待诊断电缆是否出现故障,确定故障类型。实验结果表明,所提方法适用于10 kV 电缆故障的诊断,具有很高的诊断精度。

The 10 kV cable fault signal has the charac- teristics of non stationarity and nonlinearity, and the current fault diagnosis methods can not precisely describe and accura- tely extract the inherent characteristics of the cable fault signal information, resulting in the inaccurate diagnosis. Therefore, this paper puts forward a new fault diagnosis method based on the time-frequency dimension for the 10 kV cable, and analy- zes the generalized dimension method; and extends the time- domain signal to the time and frequency domain signs for the cable signal study. The paper also gives the numerical algorithm of the generalized dimension coverage method on the time frequency plane for the 10 kV cable fault signal. The analysis of the features is conducted for the 10 kV cable fault signal by generalized dimension method time and frequency domain and for any cable signal to be diagnosed, comparisons are made between this signal＇s model characteristics and the sample database to identify whether the signal cable fault occurs and determine the type of the fault. The experimental results show that the proposed method is applicable in the 10 kV cable fault diagnosis, has the very high diagnostic accuracy.