A study on the profile of HVDC insulators-DC flashover performance

Fazelian, M.; Wu, C. Y. Robert; Cheng, T.C.; Nour, H.I.M.; Wang, L.J.

doi:10.1109/14.19876

Cited by 44 publications

(13 citation statements)

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“…The L f of normal type insulator increases faster than that of outer-rib type, which suggests that the influences of geometry dimensions on contaminated flashover performance are related with shape configurations of insulator. The height of under-ribs rise in turn from the pin to the edge of insulator, thus the partial arcs initiate from the pin can bridge the ribs easily, and then the efficiency of leakage distance reduces [8]. In turn, the partial arcs elongate close to the surface of outer-rib insulators, hence the efficiencies of leakage distance of these insulators are relatively higher than that of under-rib insulators.…”

Section: Effect Of Diametermentioning

confidence: 97%

“…For cylindrical insulator, some papers state that the larger the diameter, the lower the flashover voltage [3][4][5][6], based on this conclusion, R. Matsuoka et al further point out that the increase in diameter of a cylindrical insulator decrease the polluted deposit density on its surface, and the combined impact of both factors reduces the flashover voltage significantly [7]. M. Faselian et al indiacated that with equal height under ribs, partial arcs prefer to choose the nearest path at the time of passing the entire leakage length for suspension porcelain insulator strings [8]. Therefore, it is preferable to have unequal under-ribs in order to improve the flashover voltage.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Shed Configuration on AC Flashover Performance of Polluted Porcelain Insulators

Li¹,

Zhang²,

Yang³

et al. 2016

Proceedings of the 2015 2nd International Forum on Electrical Engineering and Automation (IFEEA 2015)

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Section: Effect Of Diametermentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of Shed Configuration on AC Flashover Performance of Polluted Porcelain Insulators

Li¹,

Zhang²,

Yang³

et al. 2016

Proceedings of the 2015 2nd International Forum on Electrical Engineering and Automation (IFEEA 2015)

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“…Cheng and Nour have researched on the influence of shed profiles on the dc pollution flashover voltage [10,11]. It was found that the arc propagation path was different if the under rib was different.…”

Section: Introductionmentioning

confidence: 98%

Effects of low pressure on DC pollution performance under different insulator profiles

Zhou

Guan

et al. 2012

2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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A simplified physical model of insulator was designed to investigate the DC pollution performance at high altitude in this paper. Only two parameters, shed space and overhang, were considered in this model. The pollution flashover voltage of the model with different profiles was obtained through artificial pollution test carried out in Beijing (50m) and in Tibet (4300m). It was suggested that the degree of the pressure influence on the insulator was different under different profiles. The pressure dependence exponent changed from 0.2 to 0.4 with the change of shed overhang. The flashover processes were also observed by high speed camera. It is found that the development of the arc between two sheds showed different forms under different pressure. A statistics of the development of arc demonstrated that the different forms of arc development were the main reasons for the different pressure dependences.

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“…Because of the invariable electric field of dc voltage, there are more pollutant will accumulate on dc insulators which is 1.2-1.5 times as high as those on ac insulators under the same air environment [1,2]. [3] shows that the ratio of the pollutant which accumulated on dc insulators to those on ac insulators is 1-3 and the ratio of the pollutant on the top surface to those on the bottom surface of dc insulators is 1/3-1/20.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the pollution flashover tests on various types of dc insulators, the flashover voltages of composite insulators are still 30% higher than those of glass insulators even though the composite insulators have lost their hydrophobicity [2,7].…”

Section: Introductionmentioning

confidence: 99%

Study on Pollution Flashover Performance of Short Samples of Composite Insulators Intended for /spl plusmn/800 kV UHV DC

Jiang

Yuan

Zhang

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

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Based on the artificial pollution tests, the effects of pollution and high altitude on the flashover performance of short samples of five kinds of UHV/EHV dc composite long rod insulators are analyzed. The exponent characterizing the influence of salt deposit density on the flashover voltage is related with the profile and the material of the insulator shed. The values of the samples' exponents vary between 0.24 and 0.30, which are smaller than those of porcelain or glass cap-and-pin insulators, namely, the influence of the pollution on the composite long rod insulators is less, relatively. Thus, the composite insulators have certain advantages in severe pollution regions. The best ratio of the leakage distance to the arcing distance is about 3.35. The exponent characterizing the influence of air pressure on the flashover voltage is related with the profile and the material of the insulator shed and the pollution severity, the values of the samples' exponents vary between 0.6 and 0.8, which are larger than those of porcelain or glass cap-and-pin insulators. Therefore, the dc composite insulator used in high altitude regions should have enough arcing distance. Based on the test results, if insulator sample Type E is selected for the ±800 kV UHV dc transmission lines, the basic arcing distance should be no less than 8.16 m and the basic leakage distance no less than 30.2 m.

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A study on the profile of HVDC insulators-DC flashover performance

Cited by 44 publications

References 0 publications

Effect of Shed Configuration on AC Flashover Performance of Polluted Porcelain Insulators

Effect of Shed Configuration on AC Flashover Performance of Polluted Porcelain Insulators

Effects of low pressure on DC pollution performance under different insulator profiles

Study on Pollution Flashover Performance of Short Samples of Composite Insulators Intended for /spl plusmn/800 kV UHV DC

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