Study on AC pollution flashover performance of cap-and-pin and rod insulators at high-altitude sites

Jiang, Xingliang; Hu, Jianlin; Yuan, Jinying; Zhang, Yu Zhong; Mao, Fei

doi:10.1049/iet-gtd.2008.0198

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…The influence of ESDD on U f can be described as

U_{f} = 8.26 \times ρ_{ESDD}^{- 0.22} \times ρ_{NSDD}^{- 0.080}

. A large number of tests conducted by other researchers at high altitude sites gave the similar conclusions about the relationship between the flashover voltage and the SDD [1–3]. In addition, the pollution flashover performance of various types of porcelain, glass and composite insulators was investigated in an artificial climate chamber, which concluded that the relationship between the pollution flashover voltage and the length of the insulator string was nearly linear [6–8].…”

Section: Test Results and Analysesmentioning

confidence: 93%

“…The ac flashover performance of various short insulator strings was studied by Jiang et al [1][2][3] at three different high altitudes including Wangkun station (altitude of 4484 m), Nachitai station (altitude of 3575 m) along the Qingzang railway and Geermu urban (altitude of 2820 m). The test results indicated that exponents characterising the influence of equivalent salt deposit density (ESDD) on the pollution flashover voltage were 0.297-0.352, 0.26-0.29 and 0.26-0.32 for the glass and the rod insulators, porcelain and composite insulators, respectively.…”

Section: Introductionmentioning

confidence: 99%

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AC pollution flashover performance and flashover process of glass insulators at high altitude site

Jiang

Xiang

Zhang

et al. 2014

IET Generation, Transmission & Distribution

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The ac pollution flashover performance and flashover process of LXHY 3 -I6O insulators was investigated at a high altitude site (altitude of 1400m) in this paper. The solid layer method was used, and even-rising voltage method was adopted. According to the test results, the average pollution flashover voltage (U av ) decreased with the increase of pollution, and there was no obvious relationship between the exponent characterising the influence of pollution and the length of the insulator strings. The relationship between U av and the length of the insulator strings was nearly linear. Subsequently, the effect of the pollution and the length of insulator strings on the critical flashover arc trajectory were analysed. It concluded that the critical flashover distance (l c ) decreased with the increase of pollution, and it was shorter than the leakage distance (L 0 ), whereas there was no significant relationship between l c /L 0 and the length of insulator strings. The arc appearance at the high altitude site was very irregular with obvious bending and rocking; the local arcs deviated from the surface of the polluted insulators even more seriously and the diameter was thicker than those obtained in the normal environment. Moreover, the brightness and diameter of local arcs was related to pollution.

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“…The influence of ESDD on U f can be described as

U_{f} = 8.26 \times ρ_{ESDD}^{- 0.22} \times ρ_{NSDD}^{- 0.080}

Section: Test Results and Analysesmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

AC pollution flashover performance and flashover process of glass insulators at high altitude site

Jiang

Xiang

Zhang

et al. 2014

IET Generation, Transmission & Distribution

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“…The samples were carefully polluted by solid layer method through pasting [24,25]. The sides of insulator with different pollution degree were polluted separately.…”

Section: Test Procedures 231 Preparation and Pollutingmentioning

confidence: 99%

Investigations on AC pollution flashover performance of insulator string under different non‐uniform pollution conditions

Zhang

You

Donghong

et al. 2016

IET Generation, Transmission & Distribution

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“…The general relation between FV and the equivalent salt deposit density (ESDD) can be represented by a power curve [18]- [19], as can the relationship between FV and the no soluble deposit density (NSDD) [20]. The effect of air pressure on FV can be written as a power function, showing that FV increases as the air pressure increases [21]- [22]. The conductivity of fog water (CFW) is the key parameter in simulating the influence of salt fog or haze fog on the outdoor insulation performance: the relationship between FV and CFW can also be represented by a power curve, such as U= B×γ 20 −b [23] or U=B×e −b•γ20 [14], where B is a coefficient related to the insulator profile and material, b is an exponent related to CFW, and is taken as 2.718.…”

Section: Introductionmentioning

confidence: 99%

AC Flashover Voltage Model for Polluted Suspension Insulators and an Experimental Investigation in Salt Fog

et al. 2020

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In recent years, the performance of polluted suspension insulators operating in coastal foggy regions has attracted attention because of the occurrence of flashover. Surface wetting by salt fog accretion increases the surface conductivity and degrades the flashover performance of insulators. Normally, the effect of conductivity under fog condition and pre-contamination on the flashover of polluted insulators are analyzed separately. However, this does not reveal the flashover behavior in salt fog, which requires further research. This paper describes salt fog experiments with an AC test voltage conducted using polluted suspension insulators in a 110-kV power system. The electrical strength performance of sample insulators with salt fog treatments is analyzed, and the effects of salt deposit density (SDD) and the conductivity of fog water (CFW) on the flashover of three types of suspension insulators are studied. The concept of additional SDD is proposed to quantify analyze the effects of salt fog. The results show that there is less dependence on CFW at higher pollution levels than at lower pollution levels. That is, the effect of CFW on U 50 can be neglected for SDD>0.15 mg/cm 2 , whereas CFW has a strong effect on U 50 for SDD<0.15 mg/cm 2. CFW has a greater influence on the critical flashover voltage of ceramic insulators than on that of silicone rubber insulator. A model for calculating the critical flashover voltage of insulators is proposed by considering the combined effect of CFW and pre-polluting SDD.

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Study on AC pollution flashover performance of cap-and-pin and rod insulators at high-altitude sites

Cited by 7 publications

References 9 publications

AC pollution flashover performance and flashover process of glass insulators at high altitude site

AC pollution flashover performance and flashover process of glass insulators at high altitude site

Investigations on AC pollution flashover performance of insulator string under different non‐uniform pollution conditions

AC Flashover Voltage Model for Polluted Suspension Insulators and an Experimental Investigation in Salt Fog

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