The accurate estimation of deposits adhering on insulators is of great significance to prevent pollution flashovers which cause huge costs worldwide. Researchers have developed sensors using different technologies to monitor insulator contamination on a fine time scale. However, there is lack of analysis of these data to reveal spatial and temporal characteristics of insulator contamination, an...

Equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD) measurements are a basic requirement of power systems. In order to predict the site pollution severity (SPS) of insulators, a new method based on random forests (RFs) is proposed. Using mutual information (MI) theory and RFs, the weights of factors related to the SPS of insulators are analyzed. The samples of contamin...

This paper presents the effect of natural aging upon the performance of the polymeric insulat ion materials made from Epoxy resins, Polydimethylsiloxane (PDMS), and Rice husk ash compound. The sa mples of epoxy resin insulation material consist of Dig lycidyl Ether of Bisphenol A (DGEBA), Meta Phenylene Diamine (MPDA) as curing agent, and 325 mesh Rice Husk Ash (RHA) as filler, treated with var...

The cleaning effect of heavy rain (the rainfall reaches 5 mm every day) on surface contamination of insulators is more effective than dew, fog, mist, and other light rain conditions which can initiate leakage currents and increase the likelihood of flashover. It is well understood that heavy rain can wash away contamination from the surface of high voltage (HV) insulators and thereby reduce the...

Modern Society is strongly dependent on a reliable power supply. The availability of cheap and reliable supply of electrical energy is an indicator of societal welfare. Uninterrupted reliable operation of a modern power system depends to a great extent on reliable and satisfactory performance of insulators under different environmental conditions. This paper reports result of natural pollution ...

One of the main reasons that flashover can occur in distribution lines is the sea salt contamination of medium voltage insulators. Equivalent salt deposit density (ESDD) expresses the contamination level of insulators and is used as the main criterion for scheduling the maintenance (washing) of insulators. In this paper two different adaptive techniques, a multi model partitioning filter (MMPF)...

In order to realize the forecasting of the UHV DC insulator's pollution conditions, we introduced a PSOBP algorithm. A BP neural network (BPNN) with leakage current, temperature, relative humidity and dew point as input neurons, and ESDD as output neuron was built to forecast the ESDD. The PSO was used to optimize the the BPNN, which had great improved the convergence rate of the BP neural netw...

This report describes the natural contamination test results of ±800kV line insulators at high altitudes. Natural exposure tests with -816kV DC voltage energization were carried out at National Engineering Laboratory for UHV Engineering Technology (Kunming).The results showed that the strain type and V-type insulator strings show a lighter pollution and the insulators with a better aerodynamic ...

Pollution flashover occurs when soluble and nonsoluble materials cover the surface of an insulator, this may ultimately cause a reduction in its performance. In paper, common type sodium chloride (NaCl) was used as pollutant (ESDD) kaolin (NSDD). Samples silicone rubber (SiR) insulators were selected for study fabricated at Advanced High Voltage Engineering Research Centre (AHIVEC) Cardiff Univ...

In this work, the extent of natural cleansing effect rainfall, wind and fog or a combination these on an insulator string were investigated. Results showed that pollution losses progress with time, considerable fraction occurring within 15 minutes testing. While alone played little no role in surface cleansing, it increases by rainfall. The topsides insulators found to be more affected compared...