Calculation of electric field distribution and temperature profile of end corona protection systems on large rotating machines by use of finite element model

Staubach, Christian; Kempen, Stefan; Pohlmann, Friedhelm

doi:10.1109/elinsl.2010.5549543

Cited by 8 publications

(7 citation statements)

References 2 publications

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“…This fem-model confirms very good correlation between the calculated and measured results both electrical as well as thermal [6]. As an example figure 2 shows the false color plot of the thermal potential distribution (temperature) obtained by the fem-calculation.…”

Section: Fem Modelsupporting

confidence: 83%

“…To take into account the strong electrical and weaker thermal coupled system of the ecp a special recursion algorithm was developed and implemented in the fem-calculation [6]. This fem-model confirms very good correlation between the calculated and measured results both electrical as well as thermal [6].…”

Section: Fem Modelmentioning

confidence: 66%

“…Both qualitatively as well as quantitatively, the calculated and measured electrical field strength distribution differs only slightly. Some details, the transitions between the individual resistive ecp layers and strong gradients in the beginning and end in the region of about 140 mm cannot be identified exactly in the measured curve as a result of the measurement principle [6]. No partial discharges (PD) were detected in the ecp-region either optically or with technical equipment (coronascope).…”

Section: Test Setupmentioning

confidence: 98%

“…Due to the developed multiple coupled electrical-thermal calculation algorithm [6] and the resulting calculation time the optimization procedure has to be efficient as well as effective. Therefore several strategies for optimization were tested for this special problem.…”

Section: Optimization Algorithm Developedmentioning

confidence: 99%

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Computer aided design of an end corona protection system for accelerated voltage endurance testing at increased line frequency

Staubach

Kempen

Pohlmann

et al. 2011

2011 Electrical Insulation Conference (EIC).

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Due to highly nonlinear material characteristics the design of end corona protection systems (ecp-system) is a time consuming process. In order to accelerate this process a finite element model is developed. The model takes the nonlinear electrical and thermal coupled material properties into account. Furthermore it is able to calculate the electric and thermal behaviour of a painted or taped ecp-system. In this paper a special model is used to design a 500 Hz ecp-system. The paper quantifies why it is not possible to apply the ecp-system that was designed for power frequency also at a ten times higher frequency. Such a system is needed to accelerate the determination of the voltage endurance characteristics enabling the qualifying process of new or modified stator groundwall insulation of large turbine generators. In the first step the electrical and thermal behaviour of the insulation system with an existing ecp-configuration (50 Hz and rated voltage of 27 kV) is recalculated for an increased frequency of 500 Hz and 33 kV. In the next step an optimized layout is calculated with a new numerical algorithm, which is implemented in the finite element calculation and being efficient with calculation time. The newly developed design is verified by a test setup operating at 500 Hz and the electrical field strength distribution and temperature profile is measured.

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Section: Fem Modelsupporting

confidence: 83%

Section: Fem Modelmentioning

confidence: 66%

Section: Test Setupmentioning

confidence: 98%

Section: Optimization Algorithm Developedmentioning

confidence: 99%

See 2 more Smart Citations

Computer aided design of an end corona protection system for accelerated voltage endurance testing at increased line frequency

Staubach

Kempen

Pohlmann

et al. 2011

2011 Electrical Insulation Conference (EIC).

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“…Today, SiC composites are used in cable accessories, usually around 88wt.% (∼70vol.%), as varnishes e.g. in rotating electrical equipment such as power generators [9] or stator winding coils of large turbine-generators [10][11]. According to the percolation theory, around 16 vol.% of spherical particles are required in a continuous network in threedimensional medium randomly packed [12].…”

Section: Introductionmentioning

confidence: 99%

Contribution to the Percolation Threshold Study of Silicon Carbide Filled Polydimethylsiloxane Composites Used For Field Grading Application

Metz

Merini

Reboul

et al. 2023

Silicon

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Nonlinear V-I characteristics of particulate composite prepared from dispersion of silicon carbide in a siloxane elastomer have been measured as a function of ller concentration up to the maximum allowable of about 32 vol.%. Two critical concentrations (percolation thresholds) are obtained at volume fractions of about 17 and 24 vol.% for low and high electric elds. These values are consistent with the critical concentrations predicted by the theory: 14 and 31 vol.% respectively and may come from edge and face contacts between SiC semi-conducting particles.

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Electrical and thermal analysis of the stress grading system of a large hydro turbine

Staubach

Hildinger²,

Staubach³

2017

2017 IEEE Electrical Insulation Conference (EIC)

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Calculation of electric field distribution and temperature profile of end corona protection systems on large rotating machines by use of finite element model

Cited by 8 publications

References 2 publications

Computer aided design of an end corona protection system for accelerated voltage endurance testing at increased line frequency

Computer aided design of an end corona protection system for accelerated voltage endurance testing at increased line frequency

Contribution to the Percolation Threshold Study of Silicon Carbide Filled Polydimethylsiloxane Composites Used For Field Grading Application

Electrical and thermal analysis of the stress grading system of a large hydro turbine

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