The onset voltage of coronas on bare and coated conductors

Abdel‐Salam, M.; Turky, A; Hashem, Azza Abdel-Rahman

doi:10.1088/0022-3727/31/19/028

Cited by 53 publications

(22 citation statements)

References 10 publications

(16 reference statements)

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“…Using the corona inception voltage model,this paper Page2/7 make a Calculation procedure for corona inception voltage of a single wire .in order to prove the accuracy of the model, we compare the calculation results of this model with the full-size smooth wire test results which was done by Abdel-Salam [16]. as shown in Table I.…”

Section: Calculation Resultsmentioning

confidence: 99%

“…Corona inception voltage of the DC transmission lines related to many factors, including: pressure, temperature, humidity, etc., in addition to the environmental impact of external meteorology, the wire diameter, the surface roughness coefficient, the contamination condition, wire-to-ground height can also influence the Corona inception voltage [6][7][8][9][10][11][12][13][14][15][16].as altitude increases, the air pressure reduce,and the transmission line conductor corona inception voltage decreases [6,7].Therefore, the transmission lines which can safely operationed at low altitudes , may not be able to safe operation at high altitudes.The humidity also affects the important parameters of the transmission line corona characteristics, with increasing humidity, the transmission line conductor corona inception voltage decrease, the effect would be more significant when the pressure is low. [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Research on environmental factors of positive DC corona inception voltage of overhead transmission lines

Xu¹,

Wang²,

Zhao³

et al. 2012

2012 China International Conference on Electricity Distribution

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The corona discharge effect is one of important problems in the design and operation of transmission lines. The transmission lines pass by the high altitude region with low air pressure, which brings many special problems to the design and operation of the transmission lines. Temperature and humidity also have obvious effect on the corona characteristics of the transmission lines. Consequently, it is signiticant to study the impact of air pressure, temperature and humidity on the corona characteristics and discharge mechanism of transmission lines. A computation model is adopted for evaluating the corona inception voltage on conductors, which is established according to the gas discharge theory. The charge simulation method is introduced to the computation model to calculate the electric field intensity. Then the criterion of corona inception voltage which considers whether the number of positive ions in the secondary avalanches is greater or equal to that in the primary avalanche is used to calculate the corona inception voltage of conductors. The influence of air pressure, humidity and temperature on the corona inception voltage of conductors is analysed systematically. Corona inception voltage decreases as air pressure is lowered or temperature is raised. It is mainly due to the enlargement of ionization zone as a result of the increase of effective ionization coefficient. Simultaneity, corona inception voltage decreases with humidity increasing for strengthening of collisional ionization intensity.

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Section: Calculation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on environmental factors of positive DC corona inception voltage of overhead transmission lines

Xu¹,

Wang²,

Zhao³

et al. 2012

2012 China International Conference on Electricity Distribution

View full text Add to dashboard Cite

show abstract

“…Various criteria for the COV for transmission‐line conductors have been used 2, 5–7. In the present study we used the self‐discharge criterion to determine the COV of bare sub‐conductors in six‐bundle conductors.…”

Section: Methodsmentioning

confidence: 99%

“…The negative COV for stranded conductors and bare and coated conductors has previously been investigated using numerical methods and the gas discharge theory 2, 5–7. However, these studies only considered the COV for the electric field on a single conductor.…”

Section: Introductionmentioning

confidence: 99%

Paint‐on‐glass animation: the fellowship of digital paint and artisanal control

Laerhoven

Fiore

Haevre

et al. 2011

Computer Animation & Virtual

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In this paper we deal with paint-on-glass animation, which is a technique for making animated films by pushing slow-drying paints from frame to frame directly under the camera. As artwork is continuously destroyed upon creating new frames, the animator is not able to rehearse or refine the animation afterwards. Furthermore, due to impracticable issues like how to stack up layers containing wet paint or how to overlay masks on the wet medium, one has to take both creative as technical decisions for each shot. Our approach consists of an interactive paint setup that physically simulates paint media. Together with a set of digital tools the artist is relieved from the difficult task of sustaining a constant frame-to-frame coherence while animating and is given the possibility to modify or undo earlier paint modifications. Regarding the interaction part, the artist stays in full control by employing a tangible interface. This allows artists to push pigment with their fingers, use special-purpose digital brushes, or even to employ real life tools like paper tissue. Feedback from artists confirms the real-life behaviour of stretching and smudging the paint as well as interacting with the setup, resulting in a natural and reality-based methodology.

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“…The downward development of DL increases the surface electric field of the ground object. A positive space charge area is generated due to the collision ionization and adhesion effect, which will produce an initial corona when the positive space charge is larger than a certain value [21]. After an initial corona is generated, a streamer is formed in the discharge gap [22,23] and an UL is generated while the streamer charge Q > 1 C [24].…”

Section: Numerical Calculation Of the Striking Distance Of The Blade mentioning

confidence: 99%

An Electro-Geometric Model for Lightning Shielding of Multiple Wind Turbines

et al. 2017

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Wind turbine blades being struck by lightning is one of the most urgent problems facing wind farms. In order to reduce the probability of lightning accidents on wind farms, this paper presents a new electro-geometric model for multiple turbines. In this new model, based on the physical model of lightning leader development, the striking distance range of the blade tip receptor is calculated, taking into account the influence of the charged particles around the blade. Lightning shielding amongst multiple turbines is provided in combination with the traditional electro-geometric model, and a criterion formula is obtained for mutual shielding for multiple turbines. The influence of environmental factors, such as temperature, atmospheric pressure, air humidity, and altitude, on lightning shielding on large-scale wind farms is also analyzed by studying the lightning shielding distance between wind turbines. The calculation shows that the larger the relative air density and the absolute humidity, and the lower the altitude, and the larger the lightning shielding distance between wind turbines. The method proposed in this paper provides a theoretical basis for the lightning protection on wind farms under different environmental conditions.

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The onset voltage of coronas on bare and coated conductors

Cited by 53 publications

References 10 publications

Research on environmental factors of positive DC corona inception voltage of overhead transmission lines

Research on environmental factors of positive DC corona inception voltage of overhead transmission lines

Paint‐on‐glass animation: the fellowship of digital paint and artisanal control

An Electro-Geometric Model for Lightning Shielding of Multiple Wind Turbines

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