Effects of Vehicle Running Mode on Rail Potential and Stray Current in DC Mass Transit Systems

Xu, Shanhui; Li, Wei; Wang, Yuqiao

doi:10.1109/tvt.2013.2265093

Cited by 113 publications

(11 citation statements)

References 18 publications

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“…Comparing U ðiþ1Þ with U ðiÞ , if the voltage difference of each node is less than ε 1 and the power imbalance is less than ε 2 , the iterative solution at step t will be finished. Otherwise, the current sub-matrix of TS will be updated according to Equation (12), and the operation states of TS will be updated based on U ðiþ1Þ . The current sub-matrix of trains will be updated according to Equation (13).…”

Section: Multi-state Unified Calculation Model Of Rp and Scmentioning

confidence: 99%

“…To suppress the excessive RP and reduce the corrosion to peripheral equipment, over voltage protection device (OVPD) [12] and drainage devices (DD) [18] are often installed at the traction substation (TS). OVPD reduces RP by grounding the running rails, the action of OVPD often results in an increase of SC [16,19].…”

Section: Introductionmentioning

confidence: 99%

“…To facilitate engineering applications, many scholars simulate DC RS with mathematical models. According to the transmission line theory, the distributed parameter models can be established [12]. Based on the distributed parameter model, the differential equations of voltage and current of DC RS can be built and solved so as to obtain the distribution of SC.…”

Section: Introductionmentioning

confidence: 99%

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Multi‐state unified calculation model of rail potential and stray current in DC railway systems

Zheng

et al. 2023

IET Electrical Syst in Trans

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In order to calculate the dynamic distribution of rail potential and stray current accurately, a multi‐state unified calculation model of rail potential and stray current is proposed, and the characteristics of different protection devices and reflux system in multi‐state DC railway systems are analysed. In the proposed model, the multi‐state characteristics of the traction substation, train, protection devices and reflux system are uniformly simulated by unified node models. The mixed simulation parameters of the catenary and reflux system are unified to lumped parameter networks, and the multi‐node voltage equations are established based on the simulation model. Then, the power flow of DC railway systems is calculated using an iterative solution, and the dynamic distribution of rail potential and stray current are solved by differential equations. The multi‐state unified calculation model is built and the distribution of rail potential and stray current in different conditions are simulated based on the parameters of Wuxi Subway Line 2. In order to verify the multi‐state unified calculation model proposed, field tests and simulations are carried out. Results show that the multi‐state unified calculation model can unify the complex states of DC railway systems and calculate the distribution of rail potential and stray current accurately.

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Section: Multi-state Unified Calculation Model Of Rp and Scmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi‐state unified calculation model of rail potential and stray current in DC railway systems

Zheng

et al. 2023

IET Electrical Syst in Trans

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“…Recently, efforts have been made to study the relationship between the stray current and the running mode of the subway train. In [10], a high rail potential was observed during the operation of the subway train, field tests and equivalent circuit simulations have been applied, the results show the relevance between the rail potential and the running mode of the subway train. In [11], multitrain subway systems have been studied, and a modeling method of the rail potential and stray current has been proposed.…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Tang¹,

Li²,

Xiao

et al. 2023

IEEE Access

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During the operation of the urban subway, there will be stray current leaking into the ground, which may invade the neutral point of the transformer along the line, causing the working magnetization curve of the transformer core to shift, thereby causing the direct-current (DC) bias effect of the transformer. Since there are unknown parameters in the equivalent circuit model of the stray current of the subway, in order to simplify the process of the influence of the subway operation on the neutral current, based on the analysis of the formation mechanism of stray current, a real subway line has been selected and a monitoring platform in the nearby high-voltage (HV) substation has been built to record the neutral current. Meanwhile, through the on-site recording of the entry and exit time of subway trains at four consecutive stations, the running trajectories of the subway trains can be reversed. According to the trajectory of the subway train, the recorded neutral current was re-divided into time periods, and the synergistic analysis of the neutral current and the train trajectory in the corresponding time period was carried out. The neutral current measurement results for 4 consecutive days indicate that the influence of the subway train on the neutral current of the substation is mainly the influence of the unbalanced load, and the degree of the unbalance mainly comes from the distance and the acceleration and braking of the subway train. The trajectory of the subway train is related to the amplitude of the neutral current. The closer the subway train is to the substation, the greater the impact on the neutral current.INDEX TERMS Neutral current, urban subway, DC bias, stray current.

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“…For example, a study established a simulation model to study the influence of the transition resistance of the rail-to-ground on the distribution of stray current [17], and the results show that the stray current leaking from the rail increases with the decrease of the railto-ground transition resistance. Some scholars studied the influence of different vehicle operation modes on the distribution of rail potential and stray current [18], and the results show that the rail potential and stray current generated by the trains under acceleration and braking modes are significantly higher than the running mode of sliding and uniform speed. And when the train runs between different traction substations, the rail potential at the train position obtains the maximum value.…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Salt Content on Stray Current Distribution in Urban Rail Transit

Li¹,

Jiao

Wang

2021

IEEE Access

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In order to study the effect of soil salt content on the stray current distribution in the urban rail transit, a threelayer stray current resistance network distribution model of " rail -drainage net-ground" is established based on the method of resistance network. The mathematical model is established by using the equivalent circuit of micro-element, and the analytical expressions of voltage and current of each metal structure are derived. Then, the simulation model is established with MATLAB/Simulink software, and the simulation results are consistent with the analytical results. A small-scale experimental platform corresponding to the model is built, and the changes of leakage current and the stray current in soil samples with different NaCl content are measured. The experimental results show that the leakage current and stray current in soil samples increases with the increase of NaCl content. Finally, the experimental results are verified by the established simulation model and the simulation results are basically consistent with the experimental results, which proves the accuracy of the experimental results. The research results can provide a theoretical basis for the protection design of subway stray current.

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Effects of Vehicle Running Mode on Rail Potential and Stray Current in DC Mass Transit Systems

Cited by 113 publications

References 18 publications

Multi‐state unified calculation model of rail potential and stray current in DC railway systems

Multi‐state unified calculation model of rail potential and stray current in DC railway systems

Research on the Influence of Urban Subway on Neutral Current of High-Voltage Substations Along the Line Under Complex Environment

Effect of Soil Salt Content on Stray Current Distribution in Urban Rail Transit

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