A Study of Bird Streamer Initiated Breakdown Characteristics Under HVDC Conditions

Ijumba, N.M.; Naidoo, Kogieleum; Britten, A.C.

doi:10.1109/pesafr.2007.4498034

Cited by 8 publications

(1 citation statement)

References 3 publications

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“…As early as the last century, the notion that long strings of bird droppings near insulator string can cause flashover was proposed, and experiments confirmed that there is a certain probability of bird droppings falling near insulator string causing flashover of insulator string [4][5]. South African scholars employed copper rods of varying lengths and diameters to simulate the falling path of bird droppings, concluding that the area near the center of the ±500kV DC V-shaped insulator string is a high-risk zone [6][7]. In 2001, Tsinghua University conducted an artificial simulated bird droppings flashover test on 110kV composite insulators.…”

Section: Introductionmentioning

confidence: 99%

Influence of Bird Droppings Channel on Electric Field Distribution Characteristics for Catenary Positive Feeder Insulator String Under Windy Conditions

Xu,

Ma,

Ren

2024

IEEE Access

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Under windy conditions, air currents induce changes in the shape and trajectory of birddropping channels. Therefore, it is crucial to examine the impact of the bird droppings channel on the electric field distribution under such conditions. This study established a simulation experiment system to model the bird droppings channel's morphology under windy conditions. The experiments have identified three typical morphologies of the bird droppings channel under windy conditions: quasi-linear, wavy, and fan-shaped. A simulation model of the bird droppings channel around the insulator string of the catenary feeder was also established, analyzing the influence law of three typical bird-dropping channel forms on the local electric field intensity distribution characteristics of catenary feeder insulator strings under windy conditions. The simulation results reveal that the quasi-linear bird droppings channel causes a distorted area of the electric field on the insulator surface concentrated at the head of the channel. The electric field intensity increases with the angle of the channel offset, and the closer the channel is to the insulator edge, the stronger the electric field intensity at the head. The wavy bird droppings channel directly short-circuits the 1# insulator, resulting in the most severe distortion of the 1# insulator's surface electric field. The influence of the fan-shaped bird droppings channel on the surface electric field is mainly concentrated at the joints between the insulator cap, shed, and air. The study results indicate that, under windy conditions, the wavy-shaped channel has the most severe impact on the voltage distribution of the insulator string, whereas the quasi-linear and fan-shaped bird droppings channels exhibit nearly the same impact as under ideal working conditions. The results of this paper can provide a reference for the analysis of the causes of the bird dropping channel flashover fault of catenary feeder under windy conditions. INDEX TERMSWindy conditions; Bird droppings channel morphology; Catenary positive feeder; Insulator string; Electric field distribution

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Section: Introductionmentioning

confidence: 99%

Influence of Bird Droppings Channel on Electric Field Distribution Characteristics for Catenary Positive Feeder Insulator String Under Windy Conditions

Xu,

Ma,

Ren

2024

IEEE Access

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High-risk region of bird streamer flashover in 110 kV composite insulators and design for bird-preventing shield

Wen

et al. 2021

International Journal of Electrical Power & Energy Systems

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Analysis and Protection Studies of Bird Droppings on the Electric Field Distribution Near 330 kV Transmission Line Cathead Towers With Composite Insulators

Liu,

Fan,

et al. 2023

IEEE Access

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The increase in bird populations along the Hexi Corridor has led to an increase in flashover faults on 330 kV transmission lines caused by bird droppings. To mitigate the issue of line tripping caused by bird droppings, it is necessary to analyze the distribution of the electric field near composite insulators during the process of bird droppings falling. A three-dimensional model, including the tower, bird droppings, and insulators, was created to assess the impact of bird droppings' characteristics on the electric field near the insulators. Based on simulation results, a bird-proof cover was designed to modify the trajectory of the bird droppings' path. The research found that when bird droppings are grounded and continuous, the most severe distortion of the residual air gap field occurs at a distance of 599.34 mm from the insulator axis. In the dynamic process of ungrounded and continuous bird droppings falling downward with a length less than 3200 mm, the electric field intensity in the residual air gap remains below 5.66 kV/cm outside the circular area centered at the insulator skirt with a radius of 740 mm. Based on the simulation results under both single-end grounded and ungrounded conditions of bird droppings, a birdproof cover structure was devised to alter the location where bird droppings fall. After bird droppings fall along the edges of the bird-proof cover, the average electric field intensity between the bird droppings and the high-voltage terminal is maintained below 3.02 kV/cm. These research findings lay the foundation for subsequent fabrication of physical models of bird-proof covers.INDEX TERMS 330 kV transmission line, Composite insulator, Bird droppings flashover, Electric field distribution, Bird-proof cover.

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A Study of Bird Streamer Initiated Breakdown Characteristics Under HVDC Conditions

Cited by 8 publications

References 3 publications

Influence of Bird Droppings Channel on Electric Field Distribution Characteristics for Catenary Positive Feeder Insulator String Under Windy Conditions

Influence of Bird Droppings Channel on Electric Field Distribution Characteristics for Catenary Positive Feeder Insulator String Under Windy Conditions

High-risk region of bird streamer flashover in 110 kV composite insulators and design for bird-preventing shield

Analysis and Protection Studies of Bird Droppings on the Electric Field Distribution Near 330 kV Transmission Line Cathead Towers With Composite Insulators

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