Experimental study and mathematical modelling of flashover on extra‐high voltage insulators covered with ice

Farzaneh-Dehkordi, J.; Zhang, J.; Farzaneh, M.

doi:10.1002/hyp.5807

Cited by 15 publications

(6 citation statements)

References 14 publications

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“…However, in the case of equation (8) for calculating the residual resistance, it was assumed that this ratio was greater than 3. In a recent study, it was shown that, for calculations involving long post type insulators, the error is relatively lower as shown in Table IV [25]. In view of engineering applications, however, the error level between the experimental and the theoretical results is acceptable.…”

Section: Application To Industrial Insulatorsmentioning

confidence: 95%

Effect of insulator diameter on AC flashover voltage of an ice-covered insulator string

Farzaneh

Zhang

Volat

2006

IEEE Trans. Dielect. Electr. Insul.

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The effect of the diameter of an insulator covered with ice on its flashover voltage was investigated. The insulator diameter was simulated and varied by controlling the width of a layer of ice artificially accreted on a short string of 5 IEEE standard units. The 50% withstand voltage (V 50 ) was experimentally determined using the method described in IEC 60507. The results show that the V 50 decreases as the width of the ice layer increases. Moreover, a mathematical model for predicting the critical flashover voltage of ice-covered insulators is proposed, and is validated against the experimental results. The model is then applied to ice-covered industrial insulators with different diameters yielding good concordance between the results from the model and the experimental ones.Index Terms -Diameter simulation, flashover, ice-covered insulator, mathematical model, withstand voltage.

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Section: Application To Industrial Insulatorsmentioning

confidence: 95%

Effect of insulator diameter on AC flashover voltage of an ice-covered insulator string

Farzaneh

Zhang

Volat

2006

IEEE Trans. Dielect. Electr. Insul.

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“…The adhesion of wet snow to the insulator surface is much higher than that of dry snow, and it is easier for the icicles to bridge the gaps. Thus, the influence of wet snow on the electrical performance of insulators is more detrimental than that of dry snow [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Wet Snow Flashover Characteristics of 500-kV AC Insulator Strings with Different Arrangements

Yin

et al. 2019

Applied Sciences

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In order to study the wet snow flashover characteristics of 500-kV AC insulator strings under different arrangements, wet snow flashover tests were carried out in the large climate chamber of China Electric Power Research Institute (CEPRI). The wet snow flashover voltages were obtained by the even-rising method and the flashovers were filmed by a camera. The test results showed that the installation of an anti-icing shed of large diameter could increase the wet snow flashover voltage. The distance between the two insulators was a key parameter that influenced the discharge process and the flashover voltage. Under Λ-string arrangement, for common insulators, the flashover performance of iced insulators increased with the connection angle; for anti-icing insulators, the flashover performance increased at first and then decreased with the connection angle. In wet snow conditions, when the connection angle was at the commonly adopted angle of 60°, the flashover performance of the common insulators under the V-string and Λ-string arrangements was almost the same. For anti-icing insulators, however, the V-string arrangement was recommended according to the tests. The results obtained in this study can provide a reference for external insulation design in wet snow conditions.

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“…Nowadays, DC de-icing has been widely used in transmission lines, but there is still no effective method for the insulator strings since the complexity of flashover mechanism [1][2]. Most investigations are focused on the ice flashover character and provide considerable insight of multi-arc model [3][4][5][6][7][8][9][10][11]. Icicle is recognized to abridge the spacing of adjacent sheds, leading to electric field distortion, and water film makes it worse [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Effects of electric field distribution and water drop ejection on flashover of icicles in plane-to-plane gaps

Deng

Jia

Guan

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Ice morphology was established from field failure observations on electrical insulators, considering partial and full bridging conditions. Small scale laboratory simulations showed an important effect of droplet ejection on the probability of flashover. During the experiments, factors including applied water conductivity, icicle length, combinations of air gap and icicle length and duration of melting period were investigated using typical in-service stress levels. According to the experimental results, applied water conductivity and icicle length affected the residual ice layer resistance. Flashover voltage decreased by 33% as the conductivity increased from 150 S/cm to 750 μS/cm and reduced by 10% as icicle length declined from 6 to 4 cm for constant 2-cm air gap. Fully bridged icicles required extra energy for ice melting, leading to higher flashover voltage compared to partially bridged icicles of the same morphology. A single 3-cm air gap had 14% higher flashover voltage than a pair of 1.5 cm air gaps.

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Experimental study and mathematical modelling of flashover on extra‐high voltage insulators covered with ice

Cited by 15 publications

References 14 publications

Effect of insulator diameter on AC flashover voltage of an ice-covered insulator string

Effect of insulator diameter on AC flashover voltage of an ice-covered insulator string

Wet Snow Flashover Characteristics of 500-kV AC Insulator Strings with Different Arrangements

Effects of electric field distribution and water drop ejection on flashover of icicles in plane-to-plane gaps

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