Contaminated Insulators-Chemical Dependence of Flashover Voltages and Salt Migration

Williams, Lindsay; Kim, J. H.; Kim, Y. B.; Arai, Noriyuki; Shimoda, Osamu; Holte, K.C.

doi:10.1109/tpas.1974.293888

Cited by 23 publications

(10 citation statements)

References 4 publications

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“…In literature [6], researchers studied the flashover performance of insulator polluted by different soluble materials, and proposed that, according to kinetic theory and permeation theory, a lower flashover voltage may be a function of the type of salt.…”

Section: Symbolmentioning

confidence: 99%

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Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Zhang

Jiang

et al. 2016

Energies

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Natural polluted insulator surfaces are always coated with various kinds of soluble constituents, and those constituents affect flashover performance differentially. Currently, this fact is not considered either in laboratory experiments or field pollution degree measurements, causing the existing insulation selection method to be deficient. In this paper, a systematic study on insulator flashover voltage gradient correction involving different types of soluble pollution constituents is presented. Using a typical type glass insulator as the sample, its flashover tests, polluted by typical soluble chemicals (NaCl, NaNO 3 , KNO 3 , NH 4 NO 3 , MgSO 4 , Ca(NO 3 ) 2 and CaSO 4 ), were carried out. Then, the flashover gradient correction was made by combining the flashover performance of each soluble constituent, the equivalent salt deposit density (ESDD) contribution of the seven constituents, and the saturation performance of CaSO 4 . The correction agreed with the flashover test results of insulator polluted by three types of soluble mixture. Research results indicate that the flashover gradient correction method proposed in this paper performs well in reducing the calculating error. It is recommended to carry out component measurements and flashover gradient correction to better select outdoor insulation configuration.

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Section: Symbolmentioning

confidence: 99%

“…All these constituents must affect an insulator's electrical properties differentially [6,7], which will probably bring errors to the flashover voltage calculation. Currently, insulator flashover voltage is commonly calculated using an empirical negative exponent formula as follows [8][9][10]:…”

Section: Introductionmentioning

confidence: 99%

Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Zhang

Jiang

et al. 2016

Energies

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show abstract

“…All these constituents must impair their electrical properties differentially [6][7], which will probably bring errors to the flashover voltage calculation. Currently, insulator flashover voltage is commonly calculated using an empirical negative exponent formula as follows [8][9][10]:…”

Section: Introductionmentioning

confidence: 99%

“…In literature [6] researchers studied the flashover performance of insulator polluted by different soluble materials, and proposed that, according to kinetic theory and permeation theory, the lower flashover voltage may be a function of the type of salt.…”

Section: Introductionmentioning

confidence: 99%

Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Zhang¹,

Zhang²,

Jiang³

et al. 2016

Preprint

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Natural polluted insulator surfaces are always coated with various kinds of soluble constituents, and those constituents affect flashover performance differentially. Currently this fact is not considered either in laboratory experiments or field pollution degree measurements, causing the existing insulation selection method to be deficient. In this paper a systematical research on insulator flashover voltage gradient correction involving types of soluble pollution constituents was presented. Taking typical type glass insulator as the sample, its flashover tests polluted by typical soluble chemicals NaCl, NaNO3, KNO3, NH4NO3, MgSO4, Ca(NO3)2 and CaSO4 were carried out. Then the flashover gradient correction was made combining the flashover performance of each soluble constituent, the ESDD contribution of the seven constituents, as well as the saturation performance of CaSO4. The correction was well verified with the flashover test results of insulator polluted by three types of soluble mixture. Research results indicate that the flashover gradient correction method proposed by this paper performs well in reducing the calculating error. It is recommended to carry out component measurements and flashover gradient correction to better select outdoor insulation configuration.

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“…The research results of papers [19,20] show that PFV decreases by 0.7-1.0% when the environmental temperature increases by 1°C within the range, from 5°C to 35°C. The influence of contaminating ingredients on PFV has been analysed in papers [21][22][23], and the results of these studies indicate that under the same SDD, PFV varies with different contaminating ingredients. The influence of acid rain on PFV has also been studied in papers [24,25], and the results show that PFV decreases with the increase of acidity.…”

Section: Introductionmentioning

confidence: 99%

Study on fog flashover performance and fog‐water conductivity correction coefficient for polluted insulators

Jiang

Zhao

Zhang

et al. 2013

IET Generation, Transmission & Distribution

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The pollution flashover performance of insulators is generally tested by the steam fog method. However, environmental temperature in tests differs greatly, so the dispensability of test results is high. Moreover, the influence of fog-water conductivity has not been taken into account. Compared with the steam fog method, the cold-fog method simulating natural fog is more consistent with the actual operating conditions of transmission line insulators. This deals with the influence of salt deposit density (SDD) and fog-water conductivity on pollution flashover performance. The influence of the two factors is determined by analysing the results of laboratory experiments where polluted insulators were tested by using the cold-fog method. The results show that the 50% AC pollution flashover voltage (U 50 ) decreases as SDD and fog-water conductivity increase. The correction coefficient (K ) indicating the influence of fog-water conductivity on U 50 can be expressed as an exponential function, where the factors are 0.0476, 0.0587 and 0.0567 for samples A, B and C, respectively.

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Contaminated Insulators-Chemical Dependence of Flashover Voltages and Salt Migration

Cited by 23 publications

References 4 publications

Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Study on Insulator Flashover Voltage Gradient Correction Considering Soluble Pollution Constituents

Study on fog flashover performance and fog‐water conductivity correction coefficient for polluted insulators

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