Experimental Design of Booster-Shed Parameters for Post Insulators under Heavy Icing Conditions

Ale-Emran, Sayyed Mahdi; Farzaneh, M.

doi:10.1109/tpwrd.2014.2354340

Cited by 12 publications

(6 citation statements)

References 25 publications

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“…Icing is an important cause of power system operation failure. Serious icing accumulation will lead to structural faults and insulation problems such as tower collapse, wire breakage, fitting damage, insulation flashover, etc, causing large-scale and long-term power interruption, resulting in huge economic losses [1]- [4]. In 2008, a severe icing disaster broke out in southern China, causing the collapse of the power grid in vast areas, causing tens of billions of economic losses to the Southern Power Grid and the State Grid corporation of China.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [13]- [14] found that the corona discharge intensity at the tip of insulator icicle is mainly affected by the parameters of icicle length and the conductivity of the meltwater, and there may be more prone to ice melting flashover in the critical bridging state. References [2], [4], and [8] studied the icing flashover problem of power insulators in heavily iced area., and found that the insulators structure of ''combination model of big shed and small shed'' can alleviate the problem of insulator bridged to a certain extent, but it is difficult to completely avoid that happen. Therefore, it is of great theoretical significance and practical value to study the identification technology of icing severity and icicle length, and to remind operators of the insulator bridged status and flashover risk level in time.…”

Section: Introductionmentioning

confidence: 99%

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Research on Image Recognition Method of Icicle Length and Bridging State on Power Insulators

et al. 2019

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Icicle will cause serious distortion of insulator electric field, weaken its voltage strength, and easily cause insulator flashover. Previous studies have shown that the longer the length of icicles on insulator, the greater the possibility of electric flashover. Then, it is of great theoretical significance and practical value to study the image identification technology of icicle length of iced insulators. Firstly, the growth mechanism and structural characteristics of insulator icicles are discussed in this paper, and the image acquisition method of iced insulator is discussed. Secondly, the methods of saliency detection and color feature analysis are used to extract the region of icicle and insulator sheds respectively, then, the icicle structure on insulator is obtained by the difference calculation of above two images. Meanwhile, the pixel curve of the iced insulator image is processed by Fourier transform, and the reference size of insulators icicle is obtained by calculating the length of the shed spacing. Finally, a practical case about iced insulators in substations is analyzed in detail, which proves the effectiveness of the method proposed in this paper.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Image Recognition Method of Icicle Length and Bridging State on Power Insulators

et al. 2019

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“…Even if the insulation characteristic declines, due to humidity, it should not decline to the extent of causing a leakage. In terms of mechanical properties, a reasonable amount of mechanical strength is needed to endure the weight of the conductors between transmission lines under varied weather conditions, such as ice, snow, rain, wind, and earthquakes [8,9]. Diagnosing the lifespan of the insulator devices, during when their usage is reliable, is of significant advantage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cement Deterioration in Outdoor High-Voltage Insulator

et al. 2019

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Suspension type porcelain insulators used in overhead transmission lines comprise metal, ceramic, and cement. The deterioration of cement can lead to mechanical separation. For the degradation analysis, varied sizes of pores ranging from a few µm (capillary pores) to tens to hundreds of mm (detectable by naked eyes) were considered. Cracks that were hard to view with naked eyes were identified by staining with a fuchsine solution. The hydrogen ion concentration and pH value indicate the extent to which the cement is deteriorated. The longer the cement is used, the lower its pH value. High mechanical strength is considered an important advantage of porcelain insulators, and it may decline, if the cement is used for a longer period of time. Water ingress may also occur, resulting in expansion, due to the rehydration of the cement. The process and mechanism of expansion of cement, due to infiltration of water were described. As a method of analysis, a universal indicator was employed to evaluate the pH changes in cement. It was observed that the pH value was 12-13 for new products. However, for products that were used for 52 years, the pH value was under 7, which indicated an acidic tendency, due to deterioration.

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“…Also, under icing conditions, an improved hypothesis or theory regarding the effects of BSs was proposed by the authors [22]. This hypothesis was based on computer-aided analysis and experimental test validations at CIGELE laboratories [23][24][25]. In brief, in the case of BSs it was found that their principal influence is the formation of air gaps and their minor influence is increasing dry arcing distance.…”

Section: Introductionmentioning

confidence: 99%

Flashover performance of ice-covered post insulators with booster sheds using experiments and partial arc modeling

Ale-Emran

Farzaneh

2016

IEEE Trans. Dielect. Electr. Insul.

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The main objective of this paper is to present a new analysis, founded on partial arc activities, for evaluating the flashover performance of EHV post station insulators equipped with booster shed (BS) under heavy icing conditions. Based on observations from ordinary and high-speed cameras, novel discussions on partial arc characteristics, ice-free leakage distances, and flashover arc path were presented. Moreover, innovative axisymmetric simulations of partial arcs were implemented by using COMSOL Multiphysics in order to calculate their effects on potential distributions during the flashover process of the 4-, 5-, and 6-BS configurations. Simulation results of the BS configurations showed a redistribution of voltage drops along the air gaps after the appearance of the partial arc along the first air gap. This redistribution of voltage drop leads to the occurrence of partial arcs along the other air gaps which may somewhat explain occurrence of the flashover. The presented experimental and simulation studies can provide better designs for practical application of booster sheds.Index Terms -Booster Shed (BS), EHV post station insulator, partial discharges, FASTCAM, potential field distribution.

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Experimental Design of Booster-Shed Parameters for Post Insulators under Heavy Icing Conditions

Cited by 12 publications

References 25 publications

Research on Image Recognition Method of Icicle Length and Bridging State on Power Insulators

Research on Image Recognition Method of Icicle Length and Bridging State on Power Insulators

Analysis of Cement Deterioration in Outdoor High-Voltage Insulator

Flashover performance of ice-covered post insulators with booster sheds using experiments and partial arc modeling

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