Effects of Space Charge on the Discharge Process in an Icicle/Iced-Plate Electrode System under Positive DC Voltage

Yu, Deming; Farzaneh, M.; Zhang, J.; Shu, Lichun; Sima, W.; Sun, C.

doi:10.1109/tdei.2007.4401225

Cited by 19 publications

(9 citation statements)

References 15 publications

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“…This effect is found for both dc and ac as shown in Figure 4 [43]. In contrast to the findings for ice caps, electric fields exert a strong influence on icicle morphology and microstructure.…”

Section: Effect Of Electric Field On Insulatormentioning

confidence: 67%

Insulator flashover under icing conditions

Farzaneh

2014

IEEE Trans. Dielect. Electr. Insul.

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Atmospheric ice accretion, combined with pollution, has been recognized as a significant risk factor in the reliability of line and station insulators in cold climate regions. Flashovers occurring on ice-and snow-covered insulators result from combinations of a number of factors and parameters. Electric fields modify the structure of ice, the shape and direction of icicle elongation, the distribution of liquid water and the geometry of air gaps that break up the continuous ice surface. Electric field strength and voltage polarity as well as corona space charge and ionic wind have demonstrable influences on the flashover process. Insulator icing flashover is also affected by changes in air temperature and several other environmental and meteorological conditions including ice type and structure. The presence of surface pollution and the rejection of ions from solid to liquid layers during the freezing and melting process also play a central role in the icing flashover of insulators, which can occur at normal operating voltage under the most adverse conditions. This paper presents an overview of these phenomena and describes the interactions that lead to the initiation and development of discharges on the ice surfaces covering the insulators, as well as their evolution to flashover. The lecture also includes the modeling of these phenomena, leading to successful prediction of the critical flashover voltage as well as to insight into the most practical solutions for improved insulator design and mitigating icing flashovers.

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Section: Effect Of Electric Field On Insulatormentioning

confidence: 67%

Insulator flashover under icing conditions

Farzaneh

2014

IEEE Trans. Dielect. Electr. Insul.

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“…This effect is found for both dc and ac as shown in Fig. 4 [43]. In contrast to the findings for ice caps, electric fields exert a strong influence on icicle morphology and microstructure.…”

Section: A Effect Of Electric Field On Conductor Ice Accretionmentioning

confidence: 66%

“…Icicles on an energized station post insulator: (a) ice-covered insulator with air gaps; (b) inception of corona discharges in ice-free zones[43] Icicle grown sample under energized and non-energized conditions with bubble feature and grain texture as observed in top, middle and bottom sections of icicles[41].…”

mentioning

confidence: 99%

Insulator icing flashover

Farzaneh

2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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the insulator is a kind of important electric components, because it plays a role in electrical insulation and plays a supporting role in mechanical, power system and even the development of the whole society to a higher degree of dependence on the performance of insulators, the requirements are also rising. However, in recent years, China's domestic air pollution is serious, the weather conditions are complex, the icing flashover phenomenon has become a serious performance of insulator safety accidents. However, the proposed super hydrophobic materials in this paper, not only the anti icing flashover performance is better than the commonly used coating, and preparation process is sample, high performance, and low cost, which is expected to become a substitute for insulator coating now. the super hydrophobic coating is considered to be one of the important methods to solve the problem of flashover electrical equipment, so the study of high hydrophobicity flashover, super hydrophobic coating with high performance, simple process, low cost plays an important role in electrical equipment and power industry. In this paper, we will use a kind of method which is more powerful, graphene was prepared by electrochemical stripping and poly-two methyl siloxane in a certain proportion to prepare superhydrophobic surface. In this paper, the preparation of superhydrophobic surface, not only has excellent self-cleaning performance, but also has a very low corrosion current density. It is surprising that the superhydrophobic surface prepared by this method has good mechanical stability, and its surface can maintain the super hydrophobicity after the strong impact of the outside world. The method mentioned in this paper is not only capable of preparing a set of super hydrophobic surface self cleaning,mechanical stability is stable as a whole, it also provides a new idea for anti icing flashover of electrical equipment. 1. Introduction With the development of the electric power industry and the gradual improvement of the voltage level, the electrical equipment is playing a more and more important role in people's daily production and life. Of which the insulator is an important part of power system, however, the phenomenon of icing flashover has a great influence on the mechanical and electrical properties of insulators, which will threaten the stability and security of power system operation, resulting in huge economic losses. Take snow disaster in South China in 2008 as an example, the ice coating accidents spread to 13 provinces, State Grid economic losses in the accident up to 10 billion 450 million Yuan, and in daily life, line trip, outage accidents also occur caused by icing [1] , it causes a great impact on people's life. Therefore, it has become one of the most urgent problems to solve the problem of icing flashover. However, there are still a lot of defects in the deicing and anti icing methods currently used, and the efficiency is low and the energy consumption is large. Super hydrophobic coating is a kind of water ela...

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“…Generation of negative corona has a close relationship with electron emission of cathode surface, and corona sustained discharge depends on whether the initial electron avalanche can produce two free electrons, development of avalanche schematic diagram after icing is shown in Figure 8. When glaze icicle attached to conductor surface, discharge appears along the icicle direction because field strength under vertically direction of tips is the strongest [30], where l means the distance between one point to the lower end O, l p and l i represent distance from the head of initial electron avalanche and ionization zone boundary to the lower end O, respectively. When field strength of icicle tips increased to a certain value, ionization coefficient α would exceed attachment coefficient η [31].…”

Section: Corona Starting Processmentioning

confidence: 99%

Study on the influence of charged glaze on the corona onset voltage of bundle conductor

Chen

Jiang

Shu

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Glaze grows on the conductor surface will affect corona onset voltage (COV). Wires iced under voltage is often neglected and scaled models always adopted to study the actual bundle conductors, there is no lights have been thrown into the downtrend of COV during charged icing. AC corona tests of iced bundle conductors implemented in the Multifunction Climate Chamber, the UV imaging camera and I-U curve fitting applied to analyze the COV. Finite element models of iced conductor established to discuss how the glaze icicles affect electric field. Results show that glaze cut the COV down greatly. Different icicle morphology leads to distinct COV values. With more sub-conductors, bundle conductor gets higher COV in the same icing time. With the Increase of icing time, COV decreases with the rate slow down. Higher conductivity has no effect on morphology but reduces the COV. Sharper icicles lead to more seriously field distorted and lower COV values. This paper provides reference for selection and designation of transmission line in glaze icing areas.

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Effects of Space Charge on the Discharge Process in an Icicle/Iced-Plate Electrode System under Positive DC Voltage

Cited by 19 publications

References 15 publications

Insulator flashover under icing conditions

Insulator flashover under icing conditions

Insulator icing flashover

Study on the influence of charged glaze on the corona onset voltage of bundle conductor

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