An approach to develop a partial discharge investigation

Kolev, Nikolai; Gadjeva, Elissaveta; Danikas, M. G.; Gourov, Nikolay

doi:10.1109/eeic.1999.826262

Cited by 10 publications

(6 citation statements)

References 4 publications

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“…The second part of (49) represents a change in capacitance caused by the breakdown void based on the induced charge concept. Equation (49) represents a capacitive model of the void based on the induced charge concept and can be used as an alternative to the classical model presented in this paper (Section 2.4.3) as shown in Figure 8 and the model presented in [10]. The proposed capacitive model of a void based on the induced charge concept was implemented in MATLAB and is presented in Figure 13.…”

Section: A Capacitive Model Of Void Based On the Induced Charge Conceptmentioning

confidence: 98%

“…In other words, the cavity (void) within the insulation can be modeled as capacitors in series; therefore, even a spherical void (where there is a non-equipotential surface on the walls of the void) can still be modeled by an infinite number of capacitors connected in parallel and separated by conductances as shown in Figure 12. Each of these capacitors accommodates a small increment of voltage variation indicated by equation (10).…”

Section: The Absence Of Equipotential Surfacementioning

confidence: 99%

“…As an example, the voltage ( w ) at the surface of a spherical void as described in [19] is given below, cos 1 2 3 0 RE r r w (10) where r is the relative permittivity, is the spherical coordinates and R is the radius of the sphere.…”

Section: The Absence Of Equipotential Surface At the Wall Of The Voidmentioning

confidence: 99%

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Partial discharges and associated transients: the induced charge concept versus capacitive modeling

Achillides

Georghiou

Kyriakides

2008

IEEE Trans. Dielect. Electr. Insul.

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Ensuring a reliable electric service to industrial, commercial and residential customers is becoming an important parameter for every electricity company due to the increased demand from the customers for less downtime, high productivity and reduced maintenance cost of machinery caused by unscheduled frequent interruptions due to underground power cable failures. The presence of partial discharges (PD) is one of the most prominent indicators of defects and ongoing degradation processes of electrical insulation. The capacitive network representation of the void (model) has long been used for the study of the transients generated by a breakdown void. As an alternative to the capacitive representation of the void (model) the induced charge concept has been introduced expressing strong criticism against the capacitance modeling of voids. This paper discusses and argues this criticism and exploits the potential and weakness of the classical capacitive representation of the voids from a theoretical point of view. Finally, a new capacitive model for voids is proposed based on the induced charge concept.

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Section: A Capacitive Model Of Void Based On the Induced Charge Conceptmentioning

confidence: 98%

Section: The Absence Of Equipotential Surfacementioning

confidence: 99%

See 1 more Smart Citation

Partial discharges and associated transients: the induced charge concept versus capacitive modeling

Achillides

Georghiou

Kyriakides

2008

IEEE Trans. Dielect. Electr. Insul.

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“…For instance, if the insulation is delaminated, one can have a situation where only a minor part of cavity surface takes part in a spark, due to small discharge surface (spark channel width of the order of magnitude of a few microns), and insufficient surface conductivity of the surface, Figure 4a. In some cases, it is possible to obtain an analytic expression for the voltage and charge distribution, respectively quantities C b and C c , [2][3][4][5]. They researched the influence of variable applied frequency on the physics of discharge process, on voltage and charge distribution, as well as on the stochasticity of the process.…”

Section: Introductionmentioning

confidence: 99%

An advanced model of partial discharge in electrical insulation

2011

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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.

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“…3 and Fig. 4, as well as calculations mentioned above can be modeled, simulated and performed with the help of the special tools of the OrCAD's program package PSpice The equivalent circuit of the void developed in [2], which models the partial discharge processes in insulation materials is used. This computer model is based on Pedersen PD model [3].…”

Section: Computer Realizationmentioning

confidence: 99%

Development of partial discharge model, simulation and measurement

Kolev

Danikas²,

Gadjeva³

et al.

1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)

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In cases, when there are electrically weak areas in solid dielectric materials (most often gaseous or liquid inclusions), partial discharges (PD) can be measured when voltage is applied. Partial discharges cause degradation in insulated materials. The investigation of insulated material behavior under electrical stress and the data obtained from PD measurements provide the possibility to predict dielectric breakdown. PD measurements are affected by electrode arrangements and by measuring circuits (MC). It is very important to investigate the relation between experimental PD data, electrode arrangement and the elements of measuring circuits applying computer mode Is The present paper considers PD behavior of polyethylene voids. Various models have been built using special software tools for analogue design and simulation. The results obtained have been analyzed and discussed i n order to assess the influence of various types of measurement circuits. The data obtained from the model have been compared with the experimental results from polyethylene samples with artificially introduced cylindrical voids subjected to PD. The electrode configuration used is plane-plane, and electrodes are parallel to the cylinder ends of the void. The parameters of the models correspond to the parameters of the experimental set-up.

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An approach to develop a partial discharge investigation

Cited by 10 publications

References 4 publications

Partial discharges and associated transients: the induced charge concept versus capacitive modeling

Partial discharges and associated transients: the induced charge concept versus capacitive modeling

An advanced model of partial discharge in electrical insulation

Development of partial discharge model, simulation and measurement

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