Effect of surface charges on the flashover voltage characteristics of polymeric materials: Comparison between theory and practice

Montaño, Raúl; Sjöstedt, Hans; Serdyuk, Yuriy V.; Gubanski, Stanislaw

doi:10.1109/ceidp.2007.4451573

Cited by 4 publications

(1 citation statement)

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“…The results show the dependency of the negative flashover voltage on the polarity of the charges. Moreover, the effect of the magnitude and polarity of the predeposited charges on both negative and positive flashover voltages has been introduced in different studies [5][6][7]. It has been found that the positive charges reduce the flashover voltage while the negative ones increase it regardless of the applied voltage polarity.…”

Section: Introductionmentioning

confidence: 99%

New experimental study on the DC flashover voltage of polymer insulators: combined effect of surface charges and air humidity

Amer¹,

Laninga

McDermid

et al. 2019

High Voltage

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This research provides conclusions that can partially cover the lack of knowledge related to the effects of ambient atmospheric conditions on DC electric power transportation. Two polymer insulating materials are used for completing this research study. Inside a climate chamber, the relative humidity is controlled and adjusted from 20% to 80% RH. Then, the samples are charged with positive or negative charges by applying ±20 kV to the corona-generating ring of needles. The surface potential is measured using an electrostatic voltmeter and is converted into surface charge density later by applying the probe response matrix method. The pre-charged samples are then stressed with high-voltage negative or positive DC values inside the climate chamber over a range of controlled values of the surrounding air humidity until flashover takes place. The space charges, which can drift in the air gap to reach the solid surface, are highly affected by the level of the relative humidity of the surrounding air. Also, increasing humidity results in a reduction of the DC flashover inception voltage and a shorter time to flashover regardless of the voltage polarity. Moreover, the positive or negative flashover inception voltage of both materials increases with pre-deposited negative charges while it decreases with pre-deposited positive charges.

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Section: Introductionmentioning

confidence: 99%