Spatial Distribution of Ion Current Around HVDC Bundle Conductors

Zhou, Xiangxian; Cui, Xiang; Lu, Tiebing; Zhen, Yongzan

doi:10.1109/tpwrd.2011.2172694

Cited by 19 publications

(10 citation statements)

References 22 publications

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“…In this case, the accuracy difference of transient process between distributed parameter and lumped parameter is not obvious . Therefore, similar to the linear equivalent circuit in Zhou et al, the TPSS system can also be equivalent to a lumped parameter topology. Besides, according to Figure , the effective value of voltage on A‐phase and B‐phase feeder arms is 27.5 kV, and the voltage on neutral wire exists due to the electrical coupling between feeder arms and neutral wire.…”

Section: Modeling and Determination Parametersmentioning

confidence: 99%

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Wang

Liu

et al. 2017

Int Trans Electr Energ Syst

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Summary In single‐phase alternating current (AC) traction power supply system, to balance 3‐phase load of power system, each phase of electricity is used in rotation. Based on the 7‐section articulated split‐phase insulator of China Beijing‐Tianjin high‐speed railway line, different electromagnetic transient processes are deeply analyzed considering pantograph arc and viaduct's electrical coupling in this paper. First, based on the lumped parameter model, the process of high‐speed train passing the articulated split‐phase region, concluding the upper viaduct part and the lower viaduct part, is deeply studied. Second, through state‐space technique, 4 independent electromagnetic transient processes in articulated split‐phase region of high‐speed railway are derived and analyzed thoroughly considering the impact of pantograph arc and viaduct. Finally, the integral transient process is accurately simulated and analyzed by ATP‐EMTP software under several circumstances, such as different topologies, initial phase and phase difference of feeders, and specific suppression overvoltage measures. The independent and integral comparison results illustrate that the coupled viaduct can lead to the more complex topologies and electromagnetic transient processes. Also, the coupled viaduct can play a significant topology discharge and pantograph overvoltage suppression role for the high‐speed train passing articulated split‐phase region.

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Section: Modeling and Determination Parametersmentioning

confidence: 99%

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Wang

Liu

et al. 2017

Int Trans Electr Energ Syst

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“…The polarity of space charges in the vicinity of conductor of the DC transmission line is similar to the conductor's, and the charged particles have the same polarity as the high voltage end of the insulator [15,28,29]. A transient solution was applied to simulate the particle tracing.…”

Section: The Model and Calculate Conditionmentioning

confidence: 99%

Force and Motion Characteristics of Contamination Particles near the High Voltage End of UHVDC Insulator

Lan¹,

Zhang²,

Wang³

et al. 2017

Energies

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Abstract:It is important to reveal the relations of physical factors to deposition of contaminants on insulator. In this paper, the simulation model of high voltage end of insulator was established to study the force and motion characteristics of particles affected by electric force and airflow drag force near the ultra-high voltage direct current (UHVDC) insulator. By finite element method, the electric field was set specially to be similar to the one near practical insulator, the steady fluid field was simulated. The electric force and air drag force were loaded on the uniformly charged particles. The characteristics of the two forces on particles, the relationship between quantity of electric charge on particles and probability of particles contacting the insulator were analyzed. It was found that, near the sheds, airflow drag force on particles is significantly greater than electric force with less electric charge. As the charge multiplies, electric force increases linearly, airflow drag force grows more slowly. There is a trend that the magnitude of electric force and drag force is going to similar. Meanwhile, the probability of particles contacting the insulator is increased too. However, at a certain level of charge which has different value with different airflow velocity, the contact probability has extremum here. After exceeding the value, as the charge increasing, the contact probability decreases gradually.

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“…According to a hypothesis frequently employed in the numerical analysis of corona, the rate of charge generation at the coronating electrode is such that the space charge density distribution reduces the surface field strength to its corona onset value. This is commonly referred to as Kaptzov's assumption [21,22,23,24]. If one accepts this assumption, it could follow that a higher rate of charge removal (due to recombination) would require a higher rate of charge generation in order for the surface field to remain at its onset value.…”

Section: Constant Ac Voltage Measurementsmentioning

confidence: 99%

DC ion-currents in AC conductors in hybrid AC/DC transmission systems

Pfeiffer¹,

Schmutz²,

Franck³

2015

11th IET International Conference on AC and DC Power Transmission

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This publication presents the results of a series of laboratory investigations on the DC ion current coupling between nearby AC and DC conductors, which is an important consideration in the design of hybrid AC/DC transmission towers. The corona activity depends on the surface condition of the conductor. Whether or not the conductors produced corona was controlled by selectively wetting them. This allowed a distinction of the observed effects into field interactions and space charge interactions. One key result is that the presence of an AC field alone does not have any effect on the DC ion current coupling. Corona activity on the AC conductor, however, may significantly increase DC ion current components in both conductors. Another important finding is that the DC current in the AC conductor for the case of corona activity on both conductors was significantly larger than the sum of the DC currents based on corona activity on either conductor individually. This indicates that the bipolar space charge environment between a coronating AC and DC line plays an important role in the ion current coupling.

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Spatial Distribution of Ion Current Around HVDC Bundle Conductors

Cited by 19 publications

References 22 publications

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Research on electromagnetic transient process in articulated split-phase insulator of high-speed railway considering viaduct's electrical coupling

Force and Motion Characteristics of Contamination Particles near the High Voltage End of UHVDC Insulator

DC ion-currents in AC conductors in hybrid AC/DC transmission systems

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