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Diagnosis of Inhomogeneous Insulation Degradation in Electric Cables by Distributed Shunt Conductance Estimation

Abstract : For the diagnosis of inhomogeneous insulation degradation in electrical cables, the estimation of the 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.
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https://hal.inria.fr/hal-00776924
Contributor : Qinghua Zhang <>
Submitted on : Wednesday, January 16, 2013 - 2:53:45 PM
Last modification on : Tuesday, December 8, 2020 - 9:38:06 AM

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Qinghua Zhang, Huaibin Tang. Diagnosis of Inhomogeneous Insulation Degradation in Electric Cables by Distributed Shunt Conductance Estimation. SYSID 2012 - 16th IFAC Symposium on System Identification, Jul 2012, Brussels, Belgium. pp.607-612, ⟨10.3182/20120711-3-BE-2027.00241⟩. ⟨hal-00776924⟩

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