中低压地下电缆线路的行波特性研究

Traveling Wave Characteristics Research for Underground Cables Lines of Low Voltage

行波故障测距是目前故障测距的主要方法,主要在架空线路中应用,电缆中的在线行波测距应用较少,分析行波在电缆中的衰减和波速等特性是研制测距装置的关键。行波在电缆中的特性与在架空线路中的特性不同,针对中低压电缆线路的特点,对电缆进行建模,通过电缆阻抗矩阵和导纳矩阵对比得到行波在电缆线路中的特征。最后利用小波包分析了地下电力电缆中行波的频率特性,并计算每个频带的能量,得出能量集中的频带。为装置的测距算法提供了理论基础。

AnaIysis of traveIing wave in the cabIe attenuation and veIocity characteristics is the key for the Iocation device.Char-acteristics of traveIing wave in the cabIe with different characteristics in the overhead Iine.For Iow-voItage cabIe Iine fea-tures,modeIed on cabIe.Through the cabIe impedance and admittance matrices of contrast,got the characteristic of the traveIing wave on cabIes.FinaI y,used waveIet packet anaIysis of the frequency characteristics of traveIing wave,caIcuIated the energy of each frequency band,and the energy band.