Influence of barriers on the lightning and switching impulse strength of mean air gaps in point/plane arrangements

Béroual, Abderrahmane; Boubakeur, A.

doi:10.1109/14.108150

Cited by 50 publications

(18 citation statements)

References 2 publications

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“…In additional, the material type and barrier dimensions also can change breakdown voltage. [8] figures out that the barrier not only elongates the length of breakdown path, but also sets an electromagnetic obstacle for breakdown to occur. Both of the two factors can improve the breakdown voltage.…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, figuring out whether it is feasible to improve the breakdown voltage using barrier would be beneficial for improving the reliability of the power equipment with this kind of insulation. Many researchers have performed researches focused on the impact of insulation barrier on breakdown properties [5][6][7][8][9][10][11]. [5][6][7][8][9] have figured out that when the distance from the HV electrode to the barrier is about 20-30 % of the total gap distance, the breakdown voltage reaches the maximum.…”

Section: Introductionmentioning

confidence: 99%

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Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Liu

Karady

2015

IEEE Trans. Dielect. Electr. Insul.

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The grounded back electrode can reduce the breakdown voltage. Inserting an insulation barrier is an effective way to increase breakdown voltage. The objective of this paper is to investigate the impact of barrier on AC breakdown with back electrode. The breakdown voltage is acquired from the experiments. The electric field distribution at breakdown is also obtained via software simulation. The experiments and analysis for both 'with' and 'without' back electrode are performed. From the results, the barrier can effectively increase breakdown voltage, especially for the case with back electrode. Without back electrode, there is only one breakdown trajectory path. The breakdown trajectory is very similar for all breakdown cases without back electrode. However, with back electrode, there are three breakdown trajectory patterns in total. The behaviors of breakdown voltage and electric field vary between different patterns. The analysis indicates that electric field distribution controls breakdown characteristics. The partial discharge (PD) streamers and residual charge induced by the electric field is the key to explain all the phenomena.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Liu

Karady

2015

IEEE Trans. Dielect. Electr. Insul.

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“…The ions formed in the zone depleted by the barrier are spread on its surface, creating surface charge carriers on the insulating barrier, thereby the field between the barrier and ground plate becomes uniform, causing an increase in the breakdown voltage. This improvement in the insulation strength is called the Barrier Effect [2].…”

Section: Introductionmentioning

confidence: 99%

“…Teruya Kauno [3] studied the rod-plane configuration with paper as the barrier under AC, DC, lightning and switching impulse voltages. Beroual et a1., [2] studied the influence of barrier using Needle-Plane configuration under Lightning and Switching Impulse voltages. LiMing et a1., [4] studied the breakdown characteristics of rodbarrier-rod gap under the DC voltage.…”

Section: Introductionmentioning

confidence: 99%

Effect of barrier in short air gaps under oscillatory impulse voltages

Sarathi

Karri²

IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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In this paper, the results of investigation carried out to understand the influence of barrier in a short air gap with the Rod-Rod configuration under oscillatory impulse voltages (UOIV, SBOIV, CBOIV) of different frequencies and dampings are presented. For the purpose of comparison, results obtained under AC, DC, LI and SI voltages are also provided. IntroductionElectric or dielectric strength is an important concept for an insulation design engineer. With the advancement of power transmission capacity, it has become necessary to design a reliable, compact and cost effective insulation system. The major cause of failure of electrical insulation and subsequent damages and outages in electrical power systems are due to transient over voltages caused by lightning, switching operations, line faults, etc., cause a wide variety of non-standard wave-shapes which are oscillatory in nature. The generated Oscillatory Impulse Voltages (OIVs) are complex in nature, identified by their freYpency, decay rate etc. These oscillatory transient voltages are either unidirectional, cos-bidirectional or sine-bidirectional in nature. The frequency of oscillations produced by lightning is in the range of several hundred Hertz and that of produced by line faults or switching over voltages is in the order of 1 to 100 kHz [l].

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“…Insulating barriers are produced of thin plates made of insulating material, and are placed along one of the surfaces between the electrodes. Recent researches show that the barrier effect depends on many parameters such as the configuration of the electrodes, the applied voltage and the physical characteristics of the insulating barrier [1][2][3]. The influence of solid insulating barriers to the impulse strength of air gaps has been investigated by few researchers.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Insulating Barriers on AC Breakdown Voltage in Inhomogeneous Field

Kara

Onal

Kalenderli

et al.

MELECON 2006 - 2006 IEEE Mediterranean Electrotechnical Conference

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In this study, the effect of insulating barriers on the breakdown voltage of air in inhomogeneous field is observed. Tests are conducted in order to measure the 50 Hz AC breakdown voltage of small air gaps (up to 50 mm) formed by hemispherically capped rod-plane electrodes with an insulating barrier between them. Energized rod and grounded plane gaps are studied with the flat insulating barriers that have three different diameters. The results of the test series show how the breakdown voltage varies with the distance between the electrodes, the size and the material of the barrier, the relative position of the electrodes and the barrier between them. As a result, all three materials show nearly same effect when they are used as a barrier, the breakdown voltage varies due to the size of the barriers and the maximum flashover voltages are observed when the barriers are positioned at the nearest point to the rod electrode and the small sized barriers become effective only in very small air gaps.

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Influence of barriers on the lightning and switching impulse strength of mean air gaps in point/plane arrangements

Cited by 50 publications

References 2 publications

Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Influence of insulation barrier on AC flashover voltage with and without grounded back electrode in air

Effect of barrier in short air gaps under oscillatory impulse voltages

The Effect of Insulating Barriers on AC Breakdown Voltage in Inhomogeneous Field

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