Evaluation of the Insulation of 15 kV – 25 kV Feeders and Procedures for Substitution of Damaged Units

Oliveira, H.R.P.M. de; Pelizan, F.; Campos, I.G.; Lefort, Christine; Salles, C. de; Martı́nez, Manuel; Oliveira, Rafael Guilen de

doi:10.1109/elinsl.2006.1665273

Cited by 4 publications

(9 citation statements)

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“…As a result, approximately 19.2% of insulators that could be considered as being undamaged were tested at the high voltage laboratory. This figure was higher if compared to the first part of the research [1], in which 11.22% of undamaged insulators were removed and tested at the high voltage laboratory. This explains part of the differences observed in these two research studies between the success and error indexes of the detector antenna.…”

Section: Field Inspectionsmentioning

confidence: 77%

“…This explains part of the differences observed in these two research studies between the success and error indexes of the detector antenna. In order to try to avoid some previous drawbacks [1], the present research considers ground measurements of relative air humidity, local temperature, and wind speed. There may be some dissent about the fact that all the weather measurements were taken from the ground and no pole height correction factor was considered.…”

Section: Field Inspectionsmentioning

confidence: 99%

“…In the first part of the present research [1] 6.728 insulators were analyzed at the High Voltage Laboratory of the Federal University of Itajubá -1.934 of which were 15 kV class insulators and the remaining 4.794 25 kV class insulators. Considering transport issues, identification and other problems, 5.615 units were identified as being in test conditions, and of these, a further division was made of 1.443 15 kV class insulators and 4.172 25 kV class insulators.…”

Section: Introductionmentioning

confidence: 99%

“…Considering transport issues, identification and other problems, 5.615 units were identified as being in test conditions, and of these, a further division was made of 1.443 15 kV class insulators and 4.172 25 kV class insulators. [1] presents the success and error indexes of the noise detector applied during the field inspections. It was observed that, in spite of the high success index for damaged insulators ranging from 90% to 70%, for noise levels between 0 and 10 dB, no similar correlation with respect to the success index for undamaged insulators was obtained, which, at its best, reached 40%.…”

Section: Introductionmentioning

confidence: 99%

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Inspection of pin insulators in medium voltage distribution lines and outage reduction

Oliveira¹,

Batista²,

Lefort

et al. 2009

IET Conference Publications

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This paper presents the results of a four-year field research study involving the inspection of porcelain pin insulators in medium voltage networks aiming at defining their operational condition when installed in medium voltage distribution lines. The initial part of this research [1], performed during the first two years, considered a preliminary rough inspection using electromagnetic noise detectors and detailed final inspection using ultrasonic noises detectors. During the discussion of the research results, the need for clarifying the influence of the weather conditions on the effectiveness of the applied set of techniques was clearly detected. Therefore, the temperature, the wind speed and the relative humidity of the air were also recorded during the last part of the present research and included in a data base together with the main insulator data. Throughout these 4 years, once a single noise-emitting insulator was detected, all insulators installed in the inspected pole were removed and substituted by equivalent post insulators. These insulators were further classified, tested and a comparison of field and laboratory results was carried out to check the influence of the weather conditions on the noise level, defined by the detectors, which determines the boundary limit between damaged & undamaged insulators. The laboratory tests were carried out at the High

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Section: Field Inspectionsmentioning

confidence: 77%

Section: Field Inspectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inspection of pin insulators in medium voltage distribution lines and outage reduction

Oliveira¹,

Batista²,

Lefort

et al. 2009

IET Conference Publications

Self Cite

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show abstract

“…On the other hand, the indiscriminate replacements of aged components are considered uneconomical, and ultrasonic noise detectors appear as a good option for inspection of insulators in distribution networks [3][4]. Note that insulators can perform well in the field for decades, without any problem, but many could present some incipient state of failure.…”

Section: Introductionmentioning

confidence: 99%

A practical approach for detection of incipient failure of ceramic insulators

Madruga

Scarpini

Meyer

et al. 2013

2013 IEEE International Conference on Solid Dielectrics (ICSD)

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This works deals with the problem of finding and identifying insulating components of distribution lines that have hidden defects or present a state of incipient failure. These components, such as insulators or switches, may present sporadic defects that should be investigated by the utility. Classic tools used to find these components are based on radio interference and ultrasound signals emitted from the defective component, translated into audible noise, and relays on operator experience. This work present a simple and visual method for finding problematic components based on ultrasound, which can be employed by the crew personnel, not requiring special training.

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Inspection of Pin Insulators in Distribution Medium Voltage Lines & Outage Reductions

Oliveira¹,

Batista²,

Lefort

et al. 2008

Conference Record of the 2008 IEEE International Symposium on Electrical Insulation

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Evaluation of the Insulation of 15 kV – 25 kV Feeders and Procedures for Substitution of Damaged Units

Cited by 4 publications

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Inspection of pin insulators in medium voltage distribution lines and outage reduction

Inspection of pin insulators in medium voltage distribution lines and outage reduction

A practical approach for detection of incipient failure of ceramic insulators

Inspection of Pin Insulators in Distribution Medium Voltage Lines & Outage Reductions

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Evaluation of the Insulation of 15 kV – 25 kV Feeders and Procedures for Substitution of Damaged Units

Cited by 4 publications

References 0 publications

Inspection of pin insulators in medium voltage distribution lines and outage reduction

Inspection of pin insulators in medium voltage distribution lines and outage reduction

A practical approach for detection of incipient failure of ceramic insulators

Inspection of Pin Insulators in Distribution Medium Voltage Lines &#x00026; Outage Reductions

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Inspection of Pin Insulators in Distribution Medium Voltage Lines & Outage Reductions