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Influence of DC Electric Fields on Pollution of HVDC Composite Insulator Short Samples with Different Environmental Parameters

State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
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Energies 2019, 12(12), 2304; https://doi.org/10.3390/en12122304
Received: 6 May 2019 / Revised: 4 June 2019 / Accepted: 7 June 2019 / Published: 17 June 2019
(This article belongs to the Special Issue DC and AC Overhead Transmission Lines from Low to Extra-High Voltages)
Pollution-induced flashover is a serious threat to the safe operation of power systems. With the development of High Voltage Direct Current (HVDC), it is necessary to study insulator contamination in DC electric fields. In this paper, the energized wind tunnel contamination test was conducted in order to systematically study the pollution ratio, k (ratio of non-soluble deposit density (NSDD) of a DC-energized condition to a non-energized condition), under different environmental parameters. Later, a two-dimensional contamination model of short samples of an HVDC composite insulator was established. The particle motion characteristics under different environmental parameters were then analyzed by the finite element method (FEM). The research results showed that—the DC electric field had an influence on particle motion but in different environments, the degree of influence was different. In addition, k was found to largely vary, with a variation in the environmental parameters. When the electrical stress (Es) increased from 0 to 70 kV/m, k increased gradually. However, when the wind speed (ws) increased, k experienced a decreasing trend. Finally, as the particle diameter (dp) decreased, k increased at first, followed by a decrease, and then again showed an increase. The results of the pollution ratio, k, for different environmental parameters are of great importance for guiding anti-pollution work in power systems. View Full-Text
Keywords: contamination; pollution ratio k; HVDC composite insulators; particles motion process; electric field contamination; pollution ratio k; HVDC composite insulators; particles motion process; electric field
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Qiao, X.; Zhang, Z.; Jiang, X.; Liang, T. Influence of DC Electric Fields on Pollution of HVDC Composite Insulator Short Samples with Different Environmental Parameters. Energies 2019, 12, 2304.

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