A Pragmatic View of Some Important Transmission Line Design Issues

Carrington, R.; White, H. Brian

doi:10.1061/40642(253)40

Cited by 1 publication

(4 citation statements)

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“…According to the data table of the discharge voltage of the air gap under different rainfall intensity as shown in [16] and [17], using the least-square method for data fitting (with the fitting equation of the power function), the maximum discharge gap lengths under different discharge voltages and different rainfall intensity, and the growth rate of gap lengths under different rainfall intensities and the same discharge voltage are obtained, as shown in Tables V and VI, respectively. According to the data in Table VI, it is found that the effect of rainfall intensity under the same discharge voltage on the growth rate of gap length (namely, the rainfall correction factor ) is in accordance with the power function through drawing. Thus, the correction factor can be calculated as (8) where…”

Section: Correction On the Designed Minimum Air Gapmentioning

confidence: 99%

“…2) Obtain the correction factor according to forecasting rainfall intensity using (8). 3) Calculate the corrected designed minimum air gap by (7).…”

Section: Correction On the Designed Minimum Air Gapmentioning

confidence: 99%

“…Step 3) Calculate the corrected designed minimum air gap according to the forecasting rainfall intensity using (7) and (8).…”

Section: Correction On the Designed Minimum Air Gapmentioning

confidence: 99%

“…Reference [7] deduces the calculation equation of the minimum air gap between the conductor and building or other objects under the condition of wind swing, and gives numerical examples. Reference [8] analyzes the wind force inflicted on the transmission line and line tension under the influence of strong wind, and discusses the concept of design 0885-8977 © 2014 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission.…”

Section: Introductionmentioning

confidence: 99%

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An Online Early-Warning Method for Wind Swing Discharge of the Conductor Toward the Tangent Tower and Jumper Toward the Strain Tower

Xiong

Weng

Wang

2015

IEEE Trans. Power Delivery

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In recent years, accidents involving wind swing discharge occur on transmission lines frequently, and have affected the operational security and the power-supply reliability seriously. Since the preventive measures for wind swing discharge are expensive and difficult to implement and other factors, it is hard to avoid the trip-out accidents due to wind swing discharge. Therefore, an online early-warning method based on meteorological information for wind swing discharge is proposed from the perspective of operation. Starting with the side-phase conductor of the tangent tower and jumper of strain tower, which are common and prone to raise accidents of wind swing discharge and based on meteorological forecasting information, the wind swing angle of the suspension insulator string is calculated, then the minimum air gap between line and tower is determined through introducing a 2-D Descartes coordinate system into the tower model. At last, the comparison with designed minimum air gap is conducted to obtain warning results and release warning information. Moreover, considering the rainfall will reduce the discharge voltage of the air gap, a correction factor of rainfall is introduced to revise the designed minimum air gap to make the warning more accurate Finally, the feasibility and accuracy of the proposed method are verified by sample analysis.Index Terms-Meteorological information, risk early warning, strain tower, tangent tower, transmission lines, wind swing discharge.

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Section: Correction On the Designed Minimum Air Gapmentioning

confidence: 99%

“…2) Obtain the correction factor according to forecasting rainfall intensity using (8). 3) Calculate the corrected designed minimum air gap by (7).…”

Section: Correction On the Designed Minimum Air Gapmentioning

confidence: 99%

“…Step 3) Calculate the corrected designed minimum air gap according to the forecasting rainfall intensity using (7) and (8).…”

Section: Correction On the Designed Minimum Air Gapmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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