标题：Diagnosis of inhomogeneous insulation degradation in electric cables by distributed shunt conductance estimation
作者：Qinghua Zhang;Huaibin Tang
作者机构：[Zhang, Q] INRIA, Campus de Beaulieu, 35042 Rennes Cedex, France;[ Tang, H] School of Information Science and Engineering, Shandong University, 250100 更多
通讯作者地址：[Zhang, QH]INRIA, Campus Beaulieu, F-35042 Rennes, France.
来源：Control engineering practice
关键词：Fault diagnosis;Distributed parameter estimation;Electric cables;Telegrapher\'s equations
摘要：For the diagnosis of inhomogeneous insulation degradation in electric cables, the estimation of distributed shunt conductance is studied in this paper. Gradual growth of the shunt conductance is a consequence of degradation of the dielectric properties of the insulator. The proposed estimation method is based on voltage and current measurements at a single end of the cable. After the linearization of the bilinear term of the telegrapher\'s equations through a perturbation approach, the Kalman filter is applied to transform the problem of dynamic system parameter estimation to a simple linear regression problem. Results of numerical simulations are presented to demonstrate the feasibility of the proposed method. In particular, it is shown that the weak sensitivity of the available measurements to the shunt conductance can be compensated by long time data samples.