Pulse sequence analysis of corona discharge at DC voltage

Pihera, Josef; Trnka, Pavel; Kozak, Ondrej; Hornak, Jaroslav

doi:10.1109/demisee.2016.7530468

Cited by 4 publications

(5 citation statements)

References 5 publications

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“…It is a recognized fact that in most dc applications, when increasing the amplitude of the applied voltage, negative corona occurs first, at lower voltage, as proved in the experimental work of Fuangpian et al [23]. With the same atmospheric conditions, electrode and gap geometry, the spark breakdown condition under negative dc supply occurs at higher voltage than under positive dc supply, as proved in the experimental works of Pihera et al [30] and Maglaras et al [33]. Factors such as temperature, humidity, atmospheric pressure, electrode distance, or radius influence the corona inception voltage and discharge behavior [19].…”

Section: Coronas In Atmospheric Airmentioning

confidence: 87%

“…The integration of a growing number of renewable sources has led to the widespread use of more HVDC systems [30]. The discharge behavior under dc and ac supply is different, mainly due to the effects of the space charge generated.…”

Section: Coronas In Atmospheric Airmentioning

confidence: 99%

“…The discharge behavior under dc and ac supply is different, mainly due to the effects of the space charge generated. Even under dc supply, the behavior of positive and negative discharges is different [30]. It is a recognized fact that under dc supply, corona sources sometimes present an erratic corona behavior, which can be boosted by the presence of wind, since it can extinguish or reignite a corona source [1].…”

Section: Coronas In Atmospheric Airmentioning

confidence: 99%

See 2 more Smart Citations

Comparative Study of AC and Positive and Negative DC Visual Corona for Sphere-Plane Gaps in Atmospheric Air

2018

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Due to the expansion of high-voltage direct current (HVDC) power systems, manufacturers of high-voltage (HV) hardware for alternating current (ac) applications are focusing their efforts towards the HVDC market. Because of the historical preponderance of ac power systems, such manufacturers have a strong background in ac corona but they need to acquire more knowledge about direct current (dc) corona. Due to the complex nature of corona, experimental data is required to describe its behavior. This work performs an experimental comparative analysis between the inception of ac corona and positive and negative dc corona. First, the sphere-plane air gap is analyzed from experimental data, and the corona inception voltages for different geometries are measured in a high-voltage laboratory. Next, the surface electric field strength is determined from finite element method simulations, since it provides valuable information about corona inception conditions. The experimental data obtained are fitted to an equation based on Peek’s law, which allows determining the equivalence between the visual corona surface electric field strength for ac and dc supply. Finally, additional experimental results performed on substation connectors are presented to further validate the previous results by means of commercial high-voltage hardware. The results presented in this paper could be especially valuable for high-voltage hardware manufacturers, since they allow determining the dc voltage and electric field values at which their ac products can withstand free of corona when operating in dc grids.

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Section: Coronas In Atmospheric Airmentioning

confidence: 87%

Section: Coronas In Atmospheric Airmentioning

confidence: 99%

Section: Coronas In Atmospheric Airmentioning

confidence: 99%

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Comparative Study of AC and Positive and Negative DC Visual Corona for Sphere-Plane Gaps in Atmospheric Air

2018

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“…This paper deals with basic "Q-t PSA" diagrams which are not so frequently published as "Q-Q PSA" diagrams as the outcome of the experimental measurements and PSA plots. "Q-t PSA" provides more information about PD activity [10,11,16,19,20].…”

Section: Pulse Sequence Analysismentioning

confidence: 99%

“…Several studies [1][2][3][4][5][6] dealt with the PD issues in general. Some of the recent studies [2,[7][8][9][10] were focused on the PD under DC from a specific point of view-pulse sequence analysis (PSA). The analysis seems to be a method to distinguish the PD type at DC voltage instead of the phase-resolved characteristics used at AC voltage.…”

Section: Introductionmentioning

confidence: 99%

Partial Discharge Analysis and Simulation Using the Consecutive Pulses Correlation Method

Kozak

Pihera

2021

Energies

Self Cite

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The behaviour of partial discharge as consequences of an alternating current (AC) is already well defined. AC partial discharges have completely different behaviour, background physics and parameters than partial discharges (PD) under direct current (DC) stress. This paper focuses on the most used and promising evaluation method of the PD DC stress—pulse sequence analysis (PSA). The first step is understanding and verifying the mechanisms and principles of this method. It is provided by well-known fundamentals of AC PD and by comparison with the other diagnostic and fault-locating methods such as phase-resolved partial discharge (PRPD) and pulse diagrams. The paper shows the PSA simulations and PD analyses performed at AC and partly at DC test conditions on typical PD test arrangements such as corona, surface and internal discharges. It is shown that the simulations performed, compared and validated with data obtained from measurements on different PD arrangements are a good match. This fact opens the way for the PD source recognition in DC, especially the time-resolved pulse sequence analysis described in detail in the paper.

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Defects of electrical insulation systems with focus on FEM modeling

Hornak

Trnka

2017

2017 6th International Youth Conference on Energy (IYCE)

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Pulse sequence analysis of corona discharge at DC voltage

Cited by 4 publications

References 5 publications

Comparative Study of AC and Positive and Negative DC Visual Corona for Sphere-Plane Gaps in Atmospheric Air

Comparative Study of AC and Positive and Negative DC Visual Corona for Sphere-Plane Gaps in Atmospheric Air

Partial Discharge Analysis and Simulation Using the Consecutive Pulses Correlation Method

Defects of electrical insulation systems with focus on FEM modeling

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