Research of Effect of Wind-Blown Rain on Power Frequency Flashover Characteristic of Conductor-Tower Air Gap

Hu, Yi; Wang, Linong; Liu, Kai; Shao, Guiwei; Liu, Ting

doi:10.1109/appeec.2009.4918665

Cited by 7 publications

(8 citation statements)

References 4 publications

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“…The rain effects on switching impulse spark-over voltage of different air gaps were studied [6][7][8]. In [6,7], full-scale experimental setups were carried out, and the breakdown performances of phase-to-ground and phase-to-phase insulation with different gap lengths in dry and wet conditions have been compared.…”

Section: Introductionmentioning

confidence: 99%

“…The results indicated that the water drops in the shielding ring should be the main reason for the decrease in breakdown voltage under rain conditions [7]. The effects of rain on the breakdown characteristics of conductor-to-tower air gaps under power frequency voltages were studied in [8,9], and the breakdown characteristics of rod to plane short air gaps under different voltages (switching [10], DC [11], AC [12]) have been investigated. It has been found that rain drops can reduce the insulation strength of the power systems under different kinds of applied voltages.…”

Section: Introductionmentioning

confidence: 99%

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AC Flashover Performance of 10 kV Rod-Plane Air-Gapped Arresters under Rain Conditions

Xie

et al. 2018

Energies

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According to operational experience of power systems, the outdoor insulation strength can be reduced due to the effect of rain. Till now, little work has been done to investigate the flashover performance of air gapped arresters under rain conditions. Therefore, in this paper, experiments were carried out and the AC flashover performance of 10 kV arresters with different air gap structures was studied. The experimental results show that, for the tested arresters, the flashover current mainly flows through the air gaps and zinc oxide varistors under rain conditions. It is also confirmed that the flashover voltages decrease with the increasing of rain intensity and conductivity. In the windward direction, the wind can distort the water streams between the air gaps and rise the flashover voltages. In the leeward direction, if the rod electrode is beyond the range of the plane electrode, the flashover voltage researches the smallest value when the wind speed is 4 m/s. Analysis and discussions have been done to explain the experimental results, and the research in this paper may provide reference to improve the flashover performance of air gapped arresters under rain conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

AC Flashover Performance of 10 kV Rod-Plane Air-Gapped Arresters under Rain Conditions

Xie

et al. 2018

Energies

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“…In 2002, Yamagata carried out the full-scale experiment on insulation with different gap lengths in dry and wet conditions using shielding rings [7]. Hu [8] studied the influence of rain and wind on power frequency breakdown characteristic of conductor-to-tower clearance in 2008. These literatures offered convincing data about the breakdown characteristics of air clearance based on experiments.…”

Section: Introductionmentioning

confidence: 99%

Research on Windage Yaw Flashovers of Transmission Lines under Wind and Rain Conditions

An¹,

Guan

Zhu

et al. 2019

Energies

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Windage yaw flashovers under strong wind and rain conditions leave a negative impact on the safe operation of transmission lines. However, the mechanism behind this is not well known yet. Therefore, this paper proposes a systematic method, including three basic parts described as simulation of wind and rain loads, calculation of windage yaw, and flashover analysis, to analyze windage yaw flashovers of transmission lines. The YanMeng-particle swarm optimization (YanMeng-PSO) algorithm is proposed to enhance the simulation accuracy. Unlike the conventional approach, the windage yaw status of conductors and insulator strings is dynamically described with key nodes and the breakdown voltage of their clearances rather than windage yaw angle. Furthermore, in the second part, a new method named key-node method (KNM) is proposed to calculate the conductors’ windage yaw. Moreover, the rain effect is also considered in this paper. This paper then presents a case study on a 110 kV double-circuit transmission line section that suffered severe collapse when the typhoon Rammasun landed in Hainan island. Particular focus was placed on the windage yaw flashover before the structural failure of the transmission line. The results validated the significant rain effect and found that conductors/ground suffer more severe windage yaw flashover than insulator strings. Finally, constructive solutions such as interphase spacers, reasonable conductor arrangement in the design phase, and regular measurements and adjustments of conductor sag in the maintenance phase are proposed to improve the design of transmission lines to enhance their capacity against windage yaw flashovers.

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“…Results about breakdown performance and analysis of air gap under rain conditions can be found in [2][3][4][5][6][7][8]. Rizk [2][3] investigated the influence of rain on switching impulse spark-over voltage of sphere-plane, toroid-plane and rod-plane air gap.…”

Section: Introductionmentioning

confidence: 99%

“…He pointed that that the effect of water drops on the shielding ring should be considered as the main reason for the decrease in breakdown voltage in wet tests. In [5], the influence of rain and wind on power frequency discharge characteristic of conductor-to-tower air gap was investigated to describe the effect of rain intensity and rain conductivity on the discharge voltage of conductor-to-tower air gap. Xingliang Jiang [6][7] reported the ac breakdown characteristics of rod-plane air gap in rain conditions.…”

Section: Introductionmentioning

confidence: 99%

DC positive discharge performance of rod-plane short air gap under rain conditions

Jiang

Yao

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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To study the discharge performance of air gap under rain conditions and provide reference to the selection of clearance distance of external insulation in strong rain, this paper explored the influence of different environment conditions, rain intensity, rain conductivity, and ambient temperature on the dc positive breakdown voltage of rodplane air gap in the artificial climate chamber and at Xuefeng Mountain Natural Site. It is shown that the discharge voltage of rod-plane short air gap in wet condition is slightly higher than that in the dry condition; light rain has little influence on the positive dc discharge voltage of rod-plane short air gap. The relative discharge voltage of air gap decreases with an increase of rain intensity and rain conductivity with 2.2% to 0.2% / (mm/min), 1.4% to 0.1% / (100 μS/cm), respetively; and it is associated with the increase of ambient temperature with 0.3% to 0.1% / °C. In addition, several computations were carried out with different droplet sizes in rod-plane air gap. It can be indicated that the maximum electric field in the air gap increases with the increase of the radius and number of droplets.Index Terms -Rain intensity, rain conductivity, ambient temperature, air gap, dc discharge voltage, field tests.

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Research of Effect of Wind-Blown Rain on Power Frequency Flashover Characteristic of Conductor-Tower Air Gap

Cited by 7 publications

References 4 publications

AC Flashover Performance of 10 kV Rod-Plane Air-Gapped Arresters under Rain Conditions

AC Flashover Performance of 10 kV Rod-Plane Air-Gapped Arresters under Rain Conditions

Research on Windage Yaw Flashovers of Transmission Lines under Wind and Rain Conditions

DC positive discharge performance of rod-plane short air gap under rain conditions

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