Effect of Ice and Snow on the Dynamics of~Transmission Line Conductors

Dyke, P. Van; Havard, D.G.; Laneville, A.

doi:10.1007/978-1-4020-8531-4_5

Cited by 22 publications

(15 citation statements)

References 24 publications

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“…A snow cover may smooth terrain obstacles that would normally contribute to wind velocity fluctuations. A more closely constant wind velocity and azimuth will give results that are more propitious to severe aeolian vibration [13].…”

Section: Aeolian Vibration In Power Transmission Linesmentioning

confidence: 99%

Estimation of stresses in atmospheric ice during aeolian vibration of power transmission lines

Kermani

Farzaneh

Kollár

2010

Journal of Wind Engineering and Industrial Aerodynamics

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Aeolian vibration in bare and iced cable was simulated using the theory of cable vibration.High frequency vibration creates stresses in the cable and consequently in the ice covering that cable, which may result in ice failure and eventually ice shedding. These stresses were estimated in this study. Displacement of the cable during vibration was determined; furthermore, instantaneous wind loads in vertical and transverse directions, additional stresses induced by the motion in the cable and in the atmospheric ice, as well as torque due to cable springback were calculated. In order to simulate the loading conditions of a chunk of atmospheric ice in the middle of a span, a new model was developed using ABAQUS.Results from this model show in spite of high frequency vibration, the resulting level of stress in atmospheric ice is far less than its failure limit. In other words, the atmospheric ice under the condition assumed in this investigation does not shed due to aeolian vibration.

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Section: Aeolian Vibration In Power Transmission Linesmentioning

confidence: 99%

Estimation of stresses in atmospheric ice during aeolian vibration of power transmission lines

Kermani

Farzaneh

Kollár

2010

Journal of Wind Engineering and Industrial Aerodynamics

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“…Static ice weight overloads the towers and leads to sagging in power conductors. This ice build-up, with a typical thickness of a few centimetres, is aerodynamically unstable [2]. It increases the amplitude of wind-induced dynamic oscillations, galloping, and decreases the damping rate, which leads to high mechanical stress on conductors, insulating supports and towers.…”

Section: Mise En Garde/advicementioning

confidence: 99%

“…Ice-covered insulators are more susceptible to have arcs and flashovers, which may incur voltage sags, spikes or even complete power loss [6][7][8][9][10]. As an example of catastrophic destructions from icing, one can refer to the storm that hit the southern parts of Quebec and Ontario and some states of USA in January 1998, downing several kilometres of power lines, causing the collapse of hundreds of steel towers and breaking thousands of wooden sub-transmission structures [2,5,11].…”

Section: List Of Figuresmentioning

confidence: 99%

“…An example is the mechanical failure of power transmission lines and towers due to the static load of accreted ice, or dynamic stresses of ice shedding or wind-induced galloping [2]. It can also lead to loss of insulation [6][7][8][9][10] and electric arcs or flashovers between power lines and metallic supports, the latter being at ground potential.…”

Section: Atmospheric Ice Accretion On Outdoor Equipmentmentioning

confidence: 99%

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Nanostructured metal surfaces and their passivation for superhydrophobic and anti-icing applications =

Safaee¹

2008

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“…The authors of [8] have analyzed the jump heights due to vertical loading for a seven span transmission line system after ice shedding. The authors of [9] have simulated for unzipping effect considering three tests after ice shedding. The authors of [10] have considered five span system to analyze its dynamic behavior and to investigate on finding the jump height.…”

Section: Introductionmentioning

confidence: 99%

An Improved Algebraic Method for Finding the Jump Height of Iced Transmission Lines

Rashmi¹,

Shankaraiah²

2017

IJCA

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An increase in the weight of the conductor in an AC transmission line due to external loading like ice, wind etc., increases the physical sag which in turn displaces the jump height and in a multi span conductor system with unequal loading leads to arching as well. There are situations where flashover may also take place when phase to phase distance becomes small or phase to tower distance becomes small because of icing on transmission lines. Hence monitoring the changes in conductor span between tower tie up's needs to have a careful attention for its variations. This paper proposes an improved calculation using algebraic method to calculate the tension created in the line with its immediate sag effect considering ice and wind loading applied for both levelled and unlevelled spans. We see that the proposed method is able to arrive at horizontal tension within 6 iterations as compared with Newton Raphson method which takes 7 iterations and the error on application is only 0.0119% for horizontal tension on which the sag is dependent on.

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Effect of Ice and Snow on the Dynamics of~Transmission Line Conductors

Cited by 22 publications

References 24 publications

Estimation of stresses in atmospheric ice during aeolian vibration of power transmission lines

Estimation of stresses in atmospheric ice during aeolian vibration of power transmission lines

Nanostructured metal surfaces and their passivation for superhydrophobic and anti-icing applications =

An Improved Algebraic Method for Finding the Jump Height of Iced Transmission Lines

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