Prediction study on positive DC corona onset voltage of rod‐plane air gaps and its application to the design of valve hall fittings

Qiu, Zhibin; Ruan, Jiangjun; Huang, Daochun; Shu, Shi; Zhang, Du

doi:10.1049/iet-gtd.2015.0192

Cited by 15 publications

(9 citation statements)

References 29 publications

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“…In the 1980s, Rizk and others established a breakdown voltage calculation method based on the leader discharge mechanism [9,10]. In the 21st century, many studies have been conducted on the mechanism, application, and simulation model of long air gap discharges [11][12][13][14][15][16][17]. These studies have solved some problems in the field of high-voltage transmission engineering, but research on transmission line breakdown characteristics is not sufficient at present.…”

Section: Introductionmentioning

confidence: 99%

Switching impulse discharge characteristics of UHV transmission line air gaps

Gao

Wang

Zhang

et al. 2019

IEEJ Transactions Elec Engng

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The design of external insulation for transmission lines is usually based on real-type experiments. With the increasing voltage level of the transmission lines, in order to better design the experiments and reduce the experiment workload in the future, this paper studies the switching impulse discharge characteristics of air gaps of an ultrahigh-voltage (UHV) transmission line. A long air gap switching impulse breakdown voltage prediction method based on the leader discharge mechanism is proposed in this paper, and a continuous leader inception model is fitted for the air gaps in UHV transmission lines by calculating the factor R of the conductor-plane gaps. The method and the model can effectively predict the air gap breakdown voltage of transmission lines. The influence of tower width and conductor structure on air gap breakdown characteristics of UHV transmission lines is studied by the method and the model proposed this paper. The results show that, as the width of the tower increases, the breakdown voltage decreases, and as the gap length increases, the influence of the tower width on the breakdown voltage decreases. The conductor structure has no obvious influence on the discharge characteristics of transmission line air gaps.

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Section: Introductionmentioning

confidence: 99%

Switching impulse discharge characteristics of UHV transmission line air gaps

Gao

Wang

Zhang

et al. 2019

IEEJ Transactions Elec Engng

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“…The corona extinction voltage is found by gradually reducing the applied voltage from above the corona inception voltage [39]. Since the corona extinction voltage is influenced by the local atmospheric conditions [28], experimental values found in the laboratory must be corrected to take into account this effect. Therefore, this paper transforms the measured voltages under local atmospheric conditions to the standard atmosphere (101.3 kPa, 20 ºC, and absolute humidity 11 g/m 3 ) by applying the method proposed in in the IEEE Std 4-2013 standard [40].…”

Section: Experimental Visual Corona Testsmentioning

confidence: 99%

“…Visual corona tests are advantageous since they allow identifying the critical points regarding corona appearance. The information acquired from visual corona tests is very useful, since a precise assessment of the corona onset conditions plays a key role to design devices intended for high-voltage applications [22], [24], [28]. Visual corona tests are conducted in darkened laboratories, since most of the corona radiation falls within the ultraviolet spectrum, thus being almost imperceptible in daylight to the human eye [29].…”

Section: Introductionmentioning

confidence: 99%

Feasibility analysis of reduced‐scale visual corona tests in high‐voltage laboratories

Abomailek

Riba

Torrens

2019

IET Generation, Transmission & Distribution

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Corona is a critical effect that must be considered during the design and optimization stages of high-voltage hardware such as substation connectors, since due to the harmful effects, corona threats power systems reliability. Visual corona tests allow detecting and identifying the critical corona points on the surface of substation connectors, so corrective actions can be applied for product optimization. This paper focuses on reduced-scale visual corona tests intended to verify and optimize the behaviour of such high-voltage hardware. Reduced-scale visual corona tests allow reducing the voltage to be applied, laboratory size, instrumentation requirements, assembly and test times, and finally the overall costs of the tests compared to standard corona tests carried out in large-size high-voltage laboratories. A hybrid approach combining experimental tests and finite element method (FEM) simulations is presented, which allows obtaining the equivalent visual corona onset voltage between reduced-scale and full-scale tests. Although the paper focuses on the analysis of aluminium substation connectors, the proposed approach can be applied to many other hardware intended for high-voltage applications.

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“…When designing high-voltage electrical systems intended to be located at altitudes exceeding 1000 m it is imperative to know the effects of the atmospheric conditions on the specific components, otherwise it may result in premature aging, reduction of operation performance or even failure [1]. It is well known that the dielectric strength of air-insulated systems depends upon on the insulation structure, atmospheric conditions like temperature, pressure and humidity [2][3][4], as well as other factors such as the polarity and nature of the voltage applied [5]. The dielectric strength and transient overvoltage withstand levels are critical factors to design external insulation in power transmission systems [6].…”

Section: Introductionmentioning

confidence: 99%

Voltage Correction Factors for Air-Insulated Transmission Lines Operating in High-Altitude Regions to Limit Corona Activity: A Review

Riba

Larzelere²,

Rickmann

2018

Energies

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Nowadays there are several transmission lines projected to be operating in high-altitude regions. It is well known that the installation altitude has an impact on the dielectric behavior of air-insulated systems. As a result, atmospheric and voltage correction factors must be applied in air-insulated transmission systems operating in high-altitude conditions. This paper performs an exhaustive literature review, including state-of-the-art research papers and International Standards of the available correction factors to limit corona activity and ensure proper performance when planning air-insulated transmission lines intended for high-altitude areas. It has been found that there are substantial differences among the various correction methods, differences that are more evident at higher altitudes. Most high-voltage standards were not conceived to test samples to be installed in high-altitude regions and, therefore, most high-voltage laboratories are not ready to face this issue, since more detailed information is required. It is proposed to conduct more research on this topic so that the atmospheric corrections and altitude correction factors found in the current International Standards can be updated and/or modified so that high-voltage components to be installed in high-altitude regions can be tested with more accuracy, taking into account their insulation structure.

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Prediction study on positive DC corona onset voltage of rod‐plane air gaps and its application to the design of valve hall fittings

Cited by 15 publications

References 29 publications

Switching impulse discharge characteristics of UHV transmission line air gaps

Switching impulse discharge characteristics of UHV transmission line air gaps

Feasibility analysis of reduced‐scale visual corona tests in high‐voltage laboratories

Voltage Correction Factors for Air-Insulated Transmission Lines Operating in High-Altitude Regions to Limit Corona Activity: A Review

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