Detection of electrical tree propagation by partial discharge measurements

Vogelsang, R.; Fruth, B.; Farr, T.; Fröhlich, K.

doi:10.1002/etep.60

Cited by 42 publications

(32 citation statements)

References 9 publications

(17 reference statements)

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“…Similarly to the results in the model needle-plane arrangements [4], at the generator bars the apparent charge, maximum apparent charge and cumulated charge showed the most relevant change during tree growth up to final breakdown. The values measured show an increase with increasing treeing time for both materials.…”

Section: Discussionsupporting

confidence: 49%

“…In a needle-plane arrangement with transparent samples of epoxy resin, the correlation between tree growth and resulting PD was shown [4]. The cumulated charge showed a characteristic bend when changing from rather low to higher PD values [4]. This paper compares results from the needle-plane arrangement to industrially produced generator bars.…”

Section: Introductionmentioning

confidence: 94%

“…For generator bars it has been shown that the main degradation process under electrical stress is electrical treeing [3]. In a needle-plane arrangement with transparent samples of epoxy resin, the correlation between tree growth and resulting PD was shown [4]. The cumulated charge showed a characteristic bend when changing from rather low to higher PD values [4].…”

Section: Introductionmentioning

confidence: 98%

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Detection of electrical tree propagation in generator bar insulations by partial discharge measurements

Vogelsang¹,

Fruth²,

Fröhlich³

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417)

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In order to detect the degradation of high voltage machine insulation, partial discharge (PD) measurements are often used. While certain defects can be identified by PD measurements a correlation between PD activity and remaining insulation life or immanent insulation failure has so far not been convincingly demonstrated. As former investigations show, the main electrical degradation process of generator bars is electrical treeing. The electrical treeing and the PD generated thereby have therefore been investigated on generator bar insulations. The results show that treeing mainly causes delamination within the material. Discharges in such delaminations lead to a rise in apparent charge, maximum apparent charge and cumulated charge. The measured apparent charge could he calculated from the size of deterioration structures as observed in micrographs. The cumulated charge shows a characteristic bend that occurs by a change from lower to higher PD.Higher PD values are usually caused by serious material degradation. The bend in the curve of cumulated charge depends on the material and takes place between 4 % and 41 % of the total time to breakdown. It may be used as a criterion for paying more attention to the survey of the material or for consideration of repair work.

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Section: Discussionsupporting

confidence: 49%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Detection of electrical tree propagation in generator bar insulations by partial discharge measurements

Vogelsang¹,

Fruth²,

Fröhlich³

Proceedings of the 7th International Conference on Properties and Applications of Dielectric Materials (Cat. No.03CH37417)

Self Cite

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“…But the "lying S". shape [12] obtained from the plots is a common observation on experimental tree growth characteristics found in the literature. The results shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

The impact of DC bias on electrical tree growth characteristics in epoxy resin samples

Iddrissu

Rowland

2015

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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“…Electric breakdown in air causes an extremely brief electric current to flow through the air pocket. The measurement of partial discharge is the measurement of this breakdown current [11,12].…”

Section: Forces and Torques In Magnetic Field Systemsmentioning

confidence: 99%

The Humidity Effect on Machines in the Coastal Area of the Niger Delta

Afa¹

2013

AJEEE

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The environmental condition of Niger Delta is harsh with average humidity of about 85 percent (relative), and rainfall of about 2500mm. Some of the factors may affect the machine directly or indirectly. It is necessary to take a critical study to identify the effect of humidity so that proper selection could be made for safe operation and for longer life of the equipment.From the results, humidity was the most severe environmental factor that affect the machine. It was also seen that a motor stored in that environment for a year looses 15 percent of its life span due to humidity The humid effect is more severe in the rainy season therefore proper selection of machine and frequent check and drying is necessary to keep a longer life of the machine.

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Detection of electrical tree propagation by partial discharge measurements

Cited by 42 publications

References 9 publications

Detection of electrical tree propagation in generator bar insulations by partial discharge measurements

Detection of electrical tree propagation in generator bar insulations by partial discharge measurements

The impact of DC bias on electrical tree growth characteristics in epoxy resin samples

The Humidity Effect on Machines in the Coastal Area of the Niger Delta

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