Results 261 to 270 of about 4,358 (304)

Switching Surge Performance of Contaminated Insulators

IEEE Transactions on Power Apparatus and Systems, 1971
The "wet contaminant" test method, originally developed for use with alternating voltage, is extended for use with switching surges. In order to evaluate insulators under conditions where dry bands would form, it was found necessary to first energize the contaminated insulators with alternating voltage before applying the surges.
B. Macchiaroli, F. Turner
openaire   +1 more source

Insulator Contamination Forecasting Based on Fractal Analysis of Leakage Current

Energies, 2012
In this paper, an artificial pollution test is carried out to study the leakage current of porcelain insulators. Fractal theory is adopted to extract the characteristics hidden in leakage current waveforms.
Weigen Chen, Licheng Li, Chen Weigen
exaly   +2 more sources

Flashover on contaminated insulators with different diameters

IEEE Transactions on Electrical Insulation, 1991
The influence of the diameter on contamination flashover/withstand voltage of cylindrical insulators was investigated both for AC and DC. The increase in diameter of a cylindrical insulator significantly lowers the contaminated flashover/withstand voltage.
R. Matsuoka, S. Ito, K. Sakanishi, K. Naito   +3 more
openaire   +1 more source

Contamination Flashover Performance of Insulators for UHV

IEEE Transactions on Power Apparatus and Systems, 1978
The results of contamination tests performed on suspension insulators and posts in a fog chamber at 60 Hz voltages up to 1450/ 13 kV are reported. Data are presented on the flashover voltage of single standard and antifog insulator strings as long as 11.5m.
H. M. Schneider, C. W. Nicholls
openaire   +1 more source

New technology to combat with insulator contamination

IEEE/PES Transmission and Distribution Conference and Exhibition, 2003
Insulator contamination has been one of the significant subjects in the insulation design of power transmission equipment. The insulator designs and countermeasures against contamination have been studied all over the world, taking both environmental and climatic conditions into consideration. Advanced technology in insulator contamination designs have
K. Takasu, T. Irie
openaire   +1 more source

The mechanism of the contamination of porcelain insulators

Journal of the Institution of Electrical Engineers - Part II: Power Engineering, 1944
An analysis of the nature of the air-borne particles which constitute the main source of contamination on outdoor porcelain insulators, and of the forces acting upon them in the electrostatic field around an insulator, suggests that these forces are inadequate to account completely for the observed distribution and the quantity of the deposits on ...
openaire   +1 more source

Flashovers of Suspension Insulators Due to Contamination

Transactions of the American Institute of Electrical Engineers, 1948
Flashover of suspension insulators on steel tower lines, traceable to an accumulation of dirt followed by a deposit of moisture, has been the source of numerous outages of high-voltage transmission lines. The aim of the investigation described in this paper was to determine means of increasing the insulation level of existing lines under fog and dirt ...
H. A. Adler, W. H. Wickham, M. S. Oldacre   +2 more
openaire   +1 more source

Surface discharges on contaminated epoxy insulators

IEEE Transactions on Electrical Insulation, 1989
Moisture layers with low layer conductivity are characterized by low power dissipation, e.g. 50 mW for the epoxy resin model post insulator under investigation. Under those conditions, no temperature-related dry zones appear, but micro partial discharges (PDs) cannot be excluded.
D. Konig, I. Quint, P. Rosch, B. Bayer
openaire   +1 more source

Effects of biological contamination on insulator performance

Proceedings of the 6th International Conference on Properties and Applications of Dielectric Materials (Cat. No.00CH36347), 2002
Results of investigations on biological growths on different insulators, especially porcelain and silicone rubber ones, are presented. The insulators have been exposed to tropical weather under polluted and clean conditions in Sri Lanka and Tanzania since 1995. Algae contamination was found on the insulators at the clean locations.
S.M. Gubanski, M.A.R.M. Fernando, S.J. Pietr, J. Matula, A. Kyaruzi   +4 more
openaire   +1 more source

Non-Ceramic Insulators for Contaminated Environments

IEEE Transactions on Power Apparatus and Systems, 1981
Non-ceramic insulators with polymer weather sheds were evaluated for applications in contaminated environments. Insulator design, material properties and construction of the weather shed component are discussed in terms of the effects of leakage current and erosion that accompany the deposition of contaminants and moisture. The deterioration of the EPR
E.A. Cherney, D.J. Stonkus
openaire   +1 more source