Illusory Paschen curves associated with strongly electronegative gases

McAllister, I.W.

doi:10.1109/14.85109

Cited by 10 publications

(3 citation statements)

References 10 publications

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“…The minimum of the pd product corresponds to the maximum of the avalanche coefficient versus dependence. For the majority of gasses, larger values of the ratio do not lead to the anomalous Paschen effect, since increase in is counterbalanced by the decrease in [13].…”

Section: Anomalous Paschen Effectmentioning

confidence: 88%

Anomalous Paschen effect

Osmokrović

Vasić

2005

IEEE Trans. Plasma Sci.

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The aim of this paper is to discuss the area left of the Paschen minimum, i.e., the area where the anomalous Paschen effect occurs. The experimental results and numerical simulation suggest a slightly different explanation of the anomalous Paschen effect. That is to say, that the anomalous Paschen effect is the result of the breakdown in a nonhomogenous electric field (edge electrode lines).Index Terms-Anomalous Paschen effect, electrical breakdown of gases, nonhomogenous electric field.

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Section: Anomalous Paschen Effectmentioning

confidence: 88%

Anomalous Paschen effect

Osmokrović

Vasić

2005

IEEE Trans. Plasma Sci.

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“…1 it is also deduced that the dielectric strength of air greatly diminishes with the atmospheric pressure, so for a given voltage value, disruptive discharges are more likely to occur at higher altitudes. However, since most practical air gaps are non-uniform to some extent, Paschen's curves cannot be directly applied in such cases, whereas PD or corona activity can be generated at lower voltages than those required to form a disruptive discharge [48]. Most of the studies related to PD or corona inception values in low pressure environments are related to HVAC and HVDC transmission lines operating in high altitude regions in countries such as China, Nepal, Bhutan, India or Peru [42].…”

Section: Pressure Effect On Electrical Breakdown Partial Discharges and Coronamentioning

confidence: 99%

Sensor Comparison for Corona Discharge Detection Under Low Pressure Conditions

2020

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Low pressure environments, situate insulation systems in a challenging position since partial discharges (PDs), corona and arc tracking are more likely to develop. Therefore, specific solutions are required to detect such harmful phenomena before major failure occurrence. This paper deals with three low-cost and small-size sensing methods, i.e., a single loop antenna, a visible-UV imaging sensor and the measurement of the leakage current to detect corona in the early stage, thus anticipating the appearance of severer effects such as arc tracking or disruptive breakdown. The three studied methods can be applied for an on-line monitoring of corona activity under low pressure environments, thus being compatible with predictive maintenance approaches. This on-line monitoring can be used to develop improved electrical protection devices able to detect such effects in an initial stage, thus improving current solutions which are unable to do so. All three studied sensors give consistent linear responses within the studied pressure range, i.e., 10-100 kPa, with almost no drift. The sensitivity of the visible-UV imaging sensor is slightly lower than that of the others, but it has the advantage of directly locating the discharge points. Results presented in this paper can be very useful for the more electrical aircraft (MEA), which is forcing electrical distribution systems to operate at higher voltage levels. Due to the little experience and scarcity of published data, the experimental results presented in this paper can be valuable for a better understanding of the combined action of high voltage and low pressure environments.

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“…Although most practical gaps exhibit some degree of non-uniformity, uniform gaps have been widely used in the high voltage field because results with these gaps are easy to replicate. However, partial discharges can develop in non-uniform field gaps long before a complete air gap breakdown occurs [15].…”

Section: Uniform Parallel Plates Gap Paschen Curvesmentioning

confidence: 99%

Studying the breakdown electric field in uniform and non-uniform air gaps

Riba

2024

Eur. J. Phys.

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High voltage is essential in power grids, but it inevitably leads to high electrical stress and the associated risk of electrical discharges. Due to the complexity of the phenomena involved in electrical discharges, there are no analytical formulas for predicting the electric field strength at which they initiate, so experimental data and numerical methods are required for this purpose. According to many sources, electrical discharges can occur in air at normal pressure and temperature when the electric field strength is approximately 3 kV/mm or greater. This paper analyzes and discusses this threshold in detail by examining relevant electrode geometries used in high voltage applications from experimental data found in the scientific literature and using 2D finite element analysis (FEA) simulations. Uniform, quasi-uniform, and non-uniform field gaps are analyzed to help students draw conclusions and gain insight into the nature of gas breakdown and the applicability of the 3 kV/mm threshold. The approach proposed in this paper is well suited for a practical session or group project for undergraduate or even graduate courses. Despite the important effects and design implications of electrical discharges on high voltage devices, apparatus and systems, this topic is rarely covered in regular courses.

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Illusory Paschen curves associated with strongly electronegative gases

Cited by 10 publications

References 10 publications

Anomalous Paschen effect

Anomalous Paschen effect

Sensor Comparison for Corona Discharge Detection Under Low Pressure Conditions

Studying the breakdown electric field in uniform and non-uniform air gaps

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