Insulator icing test methods and procedures a position paper prepared by the ieee task force on insulator icing test methods

Farzaneh, M.; Baker, T.; Bernstorf, A.; Brown, K.; Chisholm, William A.; Tourreil, C. de; Drapeau, J.F.; Fikke, Svein M.; George, Jean-Marie; Gnandt, E.; Grisham, T.; Gutman, I.; Hartings, R.; Kremer, R.; Powell, G.; Rolfseng, L.; Rożek, T.; Ruff, D.L.; Shaffner, D.; Sklenička, V.; Sundararajan, R.; Yu, Jintao

doi:10.1109/tpwrd.2003.817808

Cited by 136 publications

(83 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Three different applied water conductivities of 30, 65 and 100 μS/cm were used. The method used for evaluating the maximum withstand voltage, V WS , is similar to that initially proposed in [1] and later in [13]. The V WS , is defined as the maximum level of applied voltage at which flashover did not occur for a minimum of 3 tests out of 4, under similar icing conditions.…”

Section: Flashover Resultsmentioning

confidence: 99%

Dynamics and modeling of AC arc on surface of ice

Tavakoli¹,

Farzaneh²,

Fofana³

et al. 2006

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

A self-consistent dynamic model allowing the prediction of ac discharge activities leading to flashover on ice-covered insulator surface is presented. This model takes into account the effects of a number of parameters including insulator geometry and applied water conductivity. The instantaneous variations of major parameters are discussed in order to develop a sequential time-dependent simulation of the flashover. The temporal evolution of arc current and axial arc velocity are determined in a consistent manner. The critical flashover voltage characteristics, as a function of surface conductivity, insulator length, and insulator diameter, calculated by the model are quite satisfactory when compared to the experimental results from empirical models reported in the literature.

show abstract

Section: Flashover Resultsmentioning

confidence: 99%

Dynamics and modeling of AC arc on surface of ice

Tavakoli¹,

Farzaneh²,

Fofana³

et al. 2006

IEEE Trans. Dielect. Electr. Insul.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Under certain conditions, a concomitant drastic decrease in the electrical insulation strength can lead to insulator flashover and consequent power outages [13], [14].…”

Section: List Of Tablesmentioning

confidence: 99%

Two-arc dynamic modeling of AC and DC flashovers of EHV post station insulators covered with ice based on laboratory experiments /

Ledari¹

2014

View full text Add to dashboard Cite

Ice and snow accretion on insulators has been recognized as a significant risk factor in the reliability of overhead transmission lines and substations. Accumulated ice on insulators can initiate corona discharge along ice-free zones, often called air gaps. In the presence of a highly conductive water film on the surface of the ice, while applied voltage is sufficiently high, corona discharge activity may be initiated and developed into partial arcs. Under certain conditions, these partial arcs may result in complete flashover.The general objective of this research is to study the flashover phenomenon on icecovered extra-high-voltage (EHV) post insulators. Hence, a two-arc dynamic model based on the existing mathematical models was proposed to predict the parameters of AC and DC flashovers. The model considers the arc as time-dependent impedance constituted of a resistance in series with an inductance. The residual ice layer is defined in terms of an equivalent resistance, where the equivalent surface conductivity is calculated by taking into account the water film flowing along the ice surface. The present contribution proposes a novel approach to determine the equivalent surface conductivity, based on fluid mechanics and the Navier-Stokes equations, as well as on a series of experiments carried out to measure the water film flow rate and conductivity.Moreover, the mechanisms of discharge initiation and arc development on the surface of the ice accumulated on the insulators were studied. Special attention was paid to evaluate the effect of the volume conductivity of the ice surface on the arc propagation velocity for different freezing water conductivities, using high-speed video camera techniques.The proposed models were successfully validated in laboratory using station post insulators -typically used in Hydro-Quebec 735 kV substations -under AC and DC voltages. The maximum AC and DC withstand voltages were experimentally determined based on IEEE Std 1783. Furthermore, the influence of the number and position of air gaps on the flashover performance of ice-covered insulators was investigated experimentally. Experimental results revealed that the air gap configuration affects the maximum withstand voltage significantly. The main characteristics of flashover, including minimum flashover voltage and leakage current, derived from the proposed two-arc dynamic model, respond properly to the variation of major parameters, namely, insulator length and freezing water conductivity.Finally, in order to interpret the performance of insulators under different air gap positions, the voltage and electric field distributions along the ice-covered insulator were simulated numerically during the melting period, using the Finite Element Method (FEM). Simulations results confirm that increasing the number of air gaps improves the maximum withstand voltage and uniformity of voltage distribution of EHV post insulators. Based on the results, the use of booster sheds and grading rings to improve the insulating performance of...

show abstract

“…hi some previous studies, a static model of the arc as it occurs on ice-covered insulator surfaces was presented [24,25,[67][68][69]. The model for flashover on snow-covered insulator surfaces is still a challenge in the study of outdoor insulation.…”

Section: -2 Developed Model To Estimate Arc Progress Inside Wet Snowmentioning

confidence: 99%

“…The model for flashover on snow-covered insulator surfaces is still a challenge in the study of outdoor insulation. This situation arises from the complexity of the phenomena depending on a great number of parameters including temperature, contamination, volume conductivity, density, liquid water content, and conductivity of water melted from snow [2,67,70,71].…”

Section: -2 Developed Model To Estimate Arc Progress Inside Wet Snowmentioning

confidence: 99%

Modeling of AC arc inside wet snow =

Hemmatjou¹

2006

View full text Add to dashboard Cite

Insulator icing test methods and procedures a position paper prepared by the ieee task force on insulator icing test methods

Cited by 136 publications

References 31 publications

Dynamics and modeling of AC arc on surface of ice

Dynamics and modeling of AC arc on surface of ice

Two-arc dynamic modeling of AC and DC flashovers of EHV post station insulators covered with ice based on laboratory experiments /

Modeling of AC arc inside wet snow =

Contact Info

Product

Resources

About