摘要
XLPE(交联聚乙烯)电力电缆是重要的是输电电缆,该电缆安全可靠,隐蔽性强,耐用型好。但是随着使用时间的变长,其绝缘性能会有所下降,对电网安全产生不利影响。基于差频法,对含水树枝的XLPE电缆的绝缘劣化进行了研究。着重分析了外加电源频率的选取,提出了采用最小二乘法进行1 Hz微弱特征信号的检测,并研究了水树枝长度即电缆绝缘老化程度与特征信号之间的关系。通过在Matlab/Simulink上建模仿真,证明了差频法的有效性以及基于最小二乘法检测低频微弱信号的可行性。
Cross-linked polyethylene （XLPE） power cable is widely used for its safety, reliability, durability and stealthiness. However,along with the increasing service time, the insulation performance will degrade, which affects the safety of the grid. Therefore, the paper makes a study of the insulation deterioration of XLPE power cable caused by water tree based on difference frequency method, focuses on the selection of outside power frequency, and proposes a novel l Hz weak signal detection method based on least square algorithm. In addition, the paper also reveals the relationship between the degree of deterioration and characteristic signal. Finally, the modeling and simulation study in Matlab/Simalink shows that the validity of the difference frequency method and the feasibility of the weak signal detection method based on the least square algorithm.
出处
《陕西电力》
2017年第2期88-91,共4页
Shanxi Electric Power
关键词
XLPE电力电缆
水树枝
差频法
信号检测
最小二乘法
XLPE power cable
water tree
difference frequency method
signal detection
least square algorithm
