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2 edition of Complex field analyses and calculated prediction of flashover levels on polluted insulation. found in the catalog.

Complex field analyses and calculated prediction of flashover levels on polluted insulation.

Carlos Lozano-Sousa

Complex field analyses and calculated prediction of flashover levels on polluted insulation.

by Carlos Lozano-Sousa

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  • 13 Currently reading

Published by University of Salford. in Salford .
Written in English


Edition Notes

MSc thesis, Chemical Engineering.

ID Numbers
Open LibraryOL20905448M

2. B. Hampton, “Flashover mechanism of polluted insulation”, Proceedings of the Institution of Electrical Engineers,, Vol. , (5): pp. , 3. T. Zhao, and M. G. Comber, “Calculation of electric field and potential distribution along non-ceramic insulators considering the effects of conductors and transmission towers”. The estimation of the flashover performance of polluted insulators is based on field experience and laboratory tests are invaluable as they significantly reduce the time and labour involved in insulator design and selection. The majority of the variables to be predicted are .

  The aim of this paper is the experimental study of the flashover process and the distributions of the potential and the electric field pollution carried out under 50 Hz applied voltage on a circular model simulating the L outdoor insulator largely used by the Algerian company of electricity and gas (SONELGAZ). levels. Due to rise in the voltage levels, the performance of insulators has been affected by the effect of polluted atmospheric conditions in the field and as a result of it the insulators have been found to be failing at working or system voltages only. The Eskom [1] a South African.

The modeling of polluted insulator flashover started from a mathematical pollution flashover model put forward by Obneuas [], which has served as the foundation for a quantified simulation of pollution ards other researchers improved and developed the pollution flashover model under various conditions, and built up both static and dynamic AC/DC models [2,3,4,5,6,7]. Flashover test The polluted insulators were firstly pre-charged by a predicted voltage level and then wetted by steam fog. The fog was generated by a t/h boiler, of which the rate was ± kg/hm3. During flashover test, the temperature in the .


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Complex field analyses and calculated prediction of flashover levels on polluted insulation by Carlos Lozano-Sousa Download PDF EPUB FB2

There is a vital need to understand the flashover process of polymeric insulators for safe and reliable power system operation. This paper provides a rigorous investigation of forecasting the flashover parameters of High Temperature Vulcanized (HTV) silicone rubber based on environmental and polluted conditions using machine learning.

The modified solid layer method based on the IEC Author: Arshad, Jawad Ahmad, Ahsen Tahir, Brian G. Stewart, Azam Nekahi. The performance of the insulator can be analyzed from the distribution of electric field.

Hence in this work, electric field measurements of clean and polluted insulators are used for the prediction of flashover voltage. The measurement probes for electric field from earlier era were of low resolution and bulky. Hence most of the early Cited by: 1.

The most important factor is the recovery rather than the reignition condition. A formula expressing the resistance of the pollution layer on the insulator is derived.

From this, the flashover voltage of a polluted insulator of complex shape can be calculated. A computer program has been developed to calculate the flashover under both DC and by: A method to calculate the low frequency complex electric field in polluted insulators is proposed.

The method is based on a quasi-static approximation which permits the decoupling of Maxwell's. The mathematical dynamic model of the critical parameters was proposed for fast and accurate prediction of insulators flashover based on various levels of pollution and humidity. The leakage current waveforms of clean and polluted insulators were analyzed during the experimental tests and the effect of humidity and pollution on LC and its Cited by: 1.

The study of polluted insulator flashover mechanism very important for electric power transmission reliability, efficiency and serviceability.

In this paper, a new mathematical model based on Ayrton arc voltage gradient equation, which takes account of total resistance of the polluted insulator rather than the pollution resistance value has been proposed.

[29] B. Hampton, Flashover mechanism of polluted insulation, Proc. IEEE, London 11 1 () – [30] J. Danis, A stochastic pollution flashover model, in: Fourth International Sym. Nowadays, some prediction and analysis methods in the field of power system are very mature [, ].

For example, the proposed model in based on dimensional analysis for string insulators were in good agreement with published experimental results. Besides, a neural network was trained to estimate the insulators flashover, and the neural.

The analytical results obtained from the model and experimental results are plotted together for comparison, which are shown in Fig. 3, Fig. Fig. 3 shows the relation between the magnitudes of time to flashover and flashover voltages for contaminated insulator with different surface layer conductivities.

Here, time to flashover increased slowly with the increase of flashover voltage. This paper presents a dynamic model allowing the prediction of discharge activity leading to flashover of polluted insulators.

It takes into account the instantaneous changes of the discharge (arc. The flashover performance of insulators under polluted conditions is one of the guiding factors in the design and dimensioning of insulation in power transmission lines. Hence the flashover on polluted transmission line insulators is a major problem which has to be solved by power engineers.

Flashover mechanism of polluted insulation Abstract: When a leakage current flows over the wet polluted surface of an insulator, high-resistance dry bands form.

Discharges across these dry bands usually become extinguished but, exceptionally, may develop into a flashover of the insulator.

The formation of dry bands and the subsequent growth of. Based on the analyses of the flashover voltages, the correction formulas of the flashover voltages Uf of various insulators at various rhoESDD and rhoNSDD levels are pointed out.

Prediction of DC flashover voltage of cap-and- The voltage required to maintain local discharges on polluted insulation may increase with increase in discharge length, and if this voltage. This paper deals with the analysis of leakage current characteristics of silicone rubber insulator in order to develop a new condition monitoring tool to identify the flashover of outdoor insulators.

In this work, laboratory based pollution performance tests are carried out on silicone rubber insulator under ac voltage at different pollution levels and relative humidity conditions with sodium. The reliable operation of transmission line depends on the condition of insulators. The condition of the insulator depends on the pollutants deposited on the surface of the insulator.

Prediction of flashover voltage at different conditions is an important task in order to judge the health condition of insulators. Investigating the performance of insulator at every contamination level by. DOI: /CEIDP Corpus ID: Flashover phenomena of polluted insulators energized by AC voltage @article{SalamFlashoverPO, title={Flashover phenomena of polluted insulators energized by AC voltage}, author={Abdus Salam and Hussein Ahmad and Ahmad Shamsuddin Ahmad and T.

Tamsir and M. Afendi M. Piah and Zolkafle Buntat}, journal={ Annual Report. Electrical insulators of the Provincial Electricity Authority (PEA) of medium system are mostly porcelain insulator types that consist of pin type, line post, and pin post insulators.

The distribution lines will be polluted by industrial contaminants, salt fog or natural dust. Experience shows that pollution flashover is one of the main natural calamities harming and affecting the voltage. This paper describes the development of a theoretical model to predict flashover voltage of nonceramic insulators.

The model is based on reignition and arc constants that have been derived from electric field simulations and experimental data of flashover voltage and surface resistance measurements.

New and field-aged silicone rubber and ethylene propylene diene monomer rubber samples were. EPRI AC Transmission Line Reference Book— kV and Above, 3rd ed.; EPRI: Palo Alto, CA, USA, [Google Scholar] CIGRE Working GroupTF Polluted insulators: A review of current knowledge.

CIGRE Rep.– [Google Scholar] IEC TS. The outdoor insulators of transmission lines and substations suffer from different pollution such as industrial contaminants, fog, drizzle and natural dust. These contaminations may affect the electrical performance of insulators or even lead to flashover of the insulators.

There is a lot of researches about ac flashover of outdoor insulators.The ratio of the ESDD and NSDD of upper surface to that of lower surface is and separately. The structure and shape of polymeric insulators have influence on the pollution deposit levels and non-uniform degree.

The dispersion of the pollution flashover voltage of naturally polluted composite insulators is great.for the calculation of the low frequency complex electric field in and around insulators.

This approach permits the decoupling of Maxwell’s equations. A finite difference method to calculate the electric field in and around polluted insulators with asymmetric boundary conditions has been proposed by Morales et al (4).

Furthermore a finite.