Electric Field of High Voltage Direct Current Overhead Transmission Lines with Covered Conductors

Jiang, Yuze; Li, Lefeng; Jiang, Diwen; Liang, Zhenguang; Li, Fangwei

doi:10.1109/aeees51875.2021.9403161

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…It can be seen that the majority of existing studies primarily focus on the ground total field strength, [28,29] the electromagnetic environment characteristics surround-ing high-voltage AC and DC conductors without adhering particles, [30][31][32][33] and analysis of insulator electric field. [34][35][36] However, there are fewer studies on the electromagnetic environment characteristics on the surface of high-voltage DC conductors with varying degrees of particles adhering.…”

Section: Introductionmentioning

confidence: 99%

Electric field and force characteristic of dust aerosol particles on the surface of high-voltage transmission line

Liu 刘,

Li 李,

Wang 王

et al. 2024

Chinese Phys. B

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High-voltage transmission lines play a crucial role in facilitating the utilization of renewable energy in regions prone to desertification. The accumulation of atmospheric particles on the surface of these lines can significantly impact corona discharge and wind-induced conductor displacement. Accurately quantifying the force exerted by particles adhering to conductor surfaces is essential for evaluating fouling conditions and making informed decisions. Therefore, this study investigates the changes in electric field intensity along branched conductors caused by various fouling layers and their resulting influence on the adhesion of dust particles. The findings indicate that as individual particle size increases, the field strength at the top of the particle gradually decreases and eventually stabilizes at approximately 49.22 kV/cm, which corresponds to a field strength approximately 1.96 times higher than that of an unpolluted transmission line. Furthermore, when particle spacing exceeds 15 times the particle size, the field strength around the transmission line gradually decreases and approaches the level observed on non-adhering surface. The electric field remains relatively stable. In a triangular arrangement of three particles, the maximum field strength at the tip of the fouling layer is approximately 1.44 times higher than that of double particles and 1.5 times higher compared to single particles. These results suggest that particles adhering to the transmission line have a greater affinity for adsorbing charged particles. Additionally, relevant numerical calculations demonstrate that in dry environments, the primary adhesion forces between particles and transmission lines follow an order of electrostatic force and van der Waals force. Specifically, at the minimum field strength, these forces are approximately 74.73 times and 19.43 times stronger than the gravitational force acting on the particles.

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Section: Introductionmentioning

confidence: 99%

Electric field and force characteristic of dust aerosol particles on the surface of high-voltage transmission line

Liu 刘,

Li 李,

Wang 王

et al. 2024

Chinese Phys. B

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“…In recent years, a large number of scholars have obtained power for electronic equipment through environmental energy acquisition, such as solar energy, mechanical energy, electric field energy, magnetic field energy, etc. [2][3][4][5][6] , depending on the environment in which the equipment is located, the energy used is different.…”

Section: Introductionmentioning

confidence: 99%

Research on power management circuit of magnetic field energy harvesting for wireless sensor

Liu,

Chen,

2023

J. Phys.: Conf. Ser.

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In order to solve the power supply problem of wireless sensors in the power cable environment, the changing magnetic field around the cable is used, and the open energy harvesting coil and power management circuit are used to supply power to the sensor. However, improving circuit applicability and output efficiency is the key. For this reason, through the circuit principle and simulation analysis, the basic model of the power management circuit is established, and the overvoltage protection and energy storage unit are designed for the special environment of the cable to solve the problem of circuit protection and energy supply dead zone. Then reduce the circuit loss according to the circuit topology design. Finally, an experimental platform is built to verify the output effect of the power management circuit. The voltage induced by the magnetic induction power acquisition module can obtain a stable and reliable output voltage through the power management circuit, which can realize the self-sufficiency of the power supply of the wireless sensor.

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Characteristics of Partial Discharge on 10 kV Covered Conductor Around Tower Head

Zhou¹,

Tian

Chen

et al. 2022

IEEE Access

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The widely use of covered conductor increases the reliability of distribution network. However, a new problem of partial discharge caused by covered conductor at the position of tower head is generated at the same time. This kind of partial discharge will damage the insulation layer or accelerate the deterioration of insulation, which may cause the single-phase grounding fault and affect the power supply reliability. At present, there is few systematic studies on the characteristics of this partial discharge. This paper mainly analyzes the electric field distribution near the covered conductor around tower head, builds the partial discharge experiment platform, and obtains the pulse current characteristics of partial discharge under different working conditions. The results show that the maximum electric field intensity is located at the interface between covered conductor, binding wire and air. The main causes of partial discharge are the wet and dirty of the surface of porcelain insulator and conductor insulation. The minor cause is the breakage of covered conductor insulation. Under different conditions, the initial partial discharge pulse current wave front time is 8ns ~ 45ns, the tail time is 30ns ~ 150ns. The discharge time interval can be as low as 30μs. In addition, it is found that there are two types of partial discharge through spectral analysis. One occurs when the covered conductor insulation is damaged under binding wire; the other is the covered conductor insulation is intact.

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Electric Field of High Voltage Direct Current Overhead Transmission Lines with Covered Conductors

Cited by 3 publications

References 9 publications

Electric field and force characteristic of dust aerosol particles on the surface of high-voltage transmission line

Electric field and force characteristic of dust aerosol particles on the surface of high-voltage transmission line

Research on power management circuit of magnetic field energy harvesting for wireless sensor

Characteristics of Partial Discharge on 10 kV Covered Conductor Around Tower Head

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