Abstract
It is significant to reveal the characteristics of voltage waveform of porcelain insulator with heavy industry pollution in flashover test. In this study, the contamination of insulator samples came from heavy industry pollution areas was measured. The voltage and leakage current signals in the pollution flashover test were recorded completely. A parameter, Uw, was formed by summing the variation slope of the peaks of voltage on insulator of each power frequency cycle. It quantified the fluctuant accumulation of voltage signal waveform. Another parameter, Kfv, was formed by calculating the drop slope of voltage at flashover. It was analyzed that the effects of the pollution severity and contaminant content of insulator on fluctuant accumulation of voltage signal and the drop slope of voltage at flashover. It is found there is a positive correlation between the ratio of non-soluble to soluble deposit on insulator, RNE, and the pre-flashover voltage fluctuant accumulation, Uwb. Moreover, the very heavily polluted insulators have ultra-high value of Uwb, the medium and light polluted insulators have the outstanding value of Kfv.
Highlights
The insulators of power transmission lines above 110kV voltage level located in the city and industrial area are directly affected by the industrial pollution
The analysis showed that the intensity of the odd order of harmonic components, e.g. 50, 150, and 250 Hz, were high when strong local arcs occurred on the insulator surface
By measuring the contamination characteristics of these insulators and carrying out pollution flashover tests, the analysis was achieved about the effect of contamination characteristics on voltage waveform of contamination flashover test
Summary
The insulators of power transmission lines above 110kV voltage level located in the city and industrial area are directly affected by the industrial pollution. The studies paid more attentions to the features of leakage current and voltage in pollution flashover process, and considered associating these features with properties of contamination and insulation performance. This helped to predict the pollution severity and give early warning of pollution flashover [8]–[13], [18]–[21]. This paper is interested in the voltage variation of the insulators during the pollution flashover test These insulators engaged in the study all exposed to the natural contamination deposit environment, and distributed from different pollution severity areas. The correlations of test voltage waveform and insulator pollution, and the ways of indicating the characteristics of pollution by voltage fluctuations at power frequency are the concerns of this work
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