Facta Univ. Ser.: Elec. Energ., vol. 24, No. 1, April 2011, pp. 43-57

An Advanced Model of Partial Discharge in Electrical Insulation

Nenad Kartalović, Dragan Kovačević, and Srđan Milosavljević

Abstract: The paper presents an advanced concept for a computer model of partial discharge (PD) in insulation. The advanced model concept is based on a well-known model, using condensers for modeling of electrical network and the cavity where discharge occurs. The fundamental advancement is the modeling of initial conditions of each discharge event by introducing a controlled voltage source and modeling its control, the modeling of parameters of PD current pulse, and advanced modeling of all circuit elements. The paper presents basic analysis of PD processes and the analysis of basic shortcomings of the well-known model. The elements of the advanced model are established, and the way to implement it. It is shown that commercial software packages for electric circuits analysis are indeed suitable for PD modeling. Physical and electrical parameters of PD pulse are established, as well as the response of observed object's electric network to the ensuing excitation. The results of the model show the possibility of modeling of PD current pulse in a wide range of parameters.

Keywords: Cavities, detectors, dielectric materials, dielectric breakdown, gas insulation, insulation testing, modeling, partial discharges..