Positive impulse flashover along smooth cylindrical insulating surfaces under variable humidity

Lazaridis, L.A.; Mikropoulos, Pantelis N.

doi:10.1109/tdei.2011.5931061

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…In the past two decades, there have been many studies concerning the effect of humidity and temperature on air breakdown under impulse as well as AC voltage stresses [14, 15, 28]. Some of these studies included insulating materials to detect the behaviour of solid insulation at higher humidity.…”

Section: Resultsmentioning

confidence: 99%

“…In general, the flashover voltage of an air gap increases as the humidity of the surrounding air increases, while it decreases when the air gap is bridged by insulating materials [14,15,[27][28][29]. Higher water vapour content (i.e.…”

Section: Effect Of Humidity On Flashover Characteristicsmentioning

confidence: 99%

“…Earlier researches have considered the effect of humidity only and studied the flashover test in the presence of dielectrics under AC and impulse voltages [12], as well as the effect of the absorption of contaminants by the insulator surface on the flashover voltage [13]. Some researchers have included the surrounding air humidity effect on the impulse flashover of pre‐charged insulation samples [14, 15] as well as the surface charge‐decay characteristics of insulating materials [16, 17]. Still, there is a need to determine the behaviour of insulating materials when stressed with HVDC under different ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Effect Of Humidity On Flashover Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Flashover under both, positive and negative, polarity impulse voltages was investigated, at pressures of −0.5 bar gauge, 0 bar gauge and 0.5 bar gauge. Previous literature reports on the performance of various different materials in high-humidity environments show different behaviour under similar conditions [1], [2], [3], [4]. The materials tested in this paper were HDPE (high-density polyethylene), Ultem (polyetherimide) and Delrin (polyoxymethylene).…”

Section: Introductionmentioning

confidence: 99%

“…Experimental results are reported in [1], with surface flashover events characterised in air with varying humidity for PTFE, silicone rubber (SIR), nylon and glazed porcelain, with a rod-plane electrode topology, under positive impulse voltages. The authors observed that, as the absolute humidity increased from 5 g/m 3 to 25 g/m 3 , the positive flashover voltage was seen to increase for both lightning impulse (LI) and switching impulse (SI) voltages.…”

Section: Introductionmentioning

confidence: 99%

Impulsive Flashover Characteristics and Weibull Statistical Analysis of Gas-Solid Interfaces With Varying Relative Humidity

et al. 2020

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This paper informs on the flashover strength of three materials: Delrin (polyoxymethylene), HDPE (high-density polyethylene) and Ultem (polyetherimide) with smooth surface finishes, in zero-grade air at −0.5, 0 and 0.5 bar gauge, and at <10%, ~50% and >90% relative humidity (RH). Both negative and positive polarity impulse voltages were applied to investigate the potentially asymmetrical electrical performance of the geometrically-symmetrical electrode arrangement. In all tests, high voltage (HV) impulses with a nominal 100/700 ns wave-shape were applied. Each test conformed with the ASTM D3426-97 standard of 'step up' testing, to find the average flashover voltage for each set of conditions. For negative polarity, each solid dielectric material demonstrated a decrease in flashover voltage as the RH was increased. For positive polarity, however, the flashover voltages were similar for all levels of RH, with the exemption of HDPE. A decrease in flashover voltage was found as the permittivity of the material increased for negative polarity, irrespective of humidity and pressure. Overall, the highest flashover voltage recorded for negative polarity was ~200 kV with an HDPE spacer, at 0.5 bar gauge and <10% RH. The poorest performance was for a Delrin spacer in negative polarity, at −0.5 bar gauge and >90% RH, at a value of ~53 kV. For positive polarity, the highest flashover voltage was for a Delrin spacer at ~50% RH and 0.5 bar gauge, with a voltage of ~180 kV; the lowest flashover voltage of ~60 kV was recorded with an HDPE spacer, at −0.5 bar gauge and >90% RH.

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Effect of Humidity on Lightning impulse Breakdown of Short Rod-Plane Air Gap

Mandela¹,

Jegadeeshkumar²,

Usa³

2019

2019 IEEE 4th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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Positive impulse flashover along smooth cylindrical insulating surfaces under variable humidity

Cited by 9 publications

References 21 publications

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

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

Impulsive Flashover Characteristics and Weibull Statistical Analysis of Gas-Solid Interfaces With Varying Relative Humidity

Effect of Humidity on Lightning impulse Breakdown of Short Rod-Plane Air Gap

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