Measurements and calculations of rail potential in D. C. traction power supply system

Ooagu, Ryosuke; Taguchi, Keita; Yukio, Yashiro; Amari, Satoru; Naito, Hiroshi; Hayashiya, Hitoshi

doi:10.1109/apl.2019.8816070

Cited by 7 publications

(4 citation statements)

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“…This means that the current flows from the rails to the ground in the high-density train operation area and is sucked from the ground to the rails in the low-density train operation area. Ooagu et al (2019) also conduced continuous measurement of rail potential in one substation for one year. It was established that the output current increased on hot and cold days and that the rail potential increased towards negative polarity especially on a cold day.…”

Section: Stray Current Measuring Methodsmentioning

confidence: 99%

Dynamic Stray Current Measuring Methods in Urban Areas

Vranešić

Serdar

Lakušić

et al. 2022

BJRBE

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In areas where urban tracks are used as public transportation, dynamic stray currents cause high maintenance costs for the tracks and metal structures near the tracks. S tray currents caused by rail vehicles depend on many factors (traffic density, vehicle speed, acceleration and deceleration, soil and track moisture), so it is very difficult to get a clear picture of the harmfulness of the stray current based on the results of a single field measurement. However, there are several measurement methods that can be used to determine the presence of stray currents and predict appropriate track maintenance actions. Some of these methods are described in this article, namely the use of stray current mapper, measurement of rail potential and rail current, measurement at the stray current collection system, and the use of non-destructive sensors. In track construction, measuring the electrical potential between rail and ground is one of the most common methods of detecting the damaging influence of stray current.

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Section: Stray Current Measuring Methodsmentioning

confidence: 99%

Dynamic Stray Current Measuring Methods in Urban Areas

Vranešić

Serdar

Lakušić

et al. 2022

BJRBE

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“…The stray current flows back to the negative pole of the traction substation through the ground grid along the line, building structural steel bars or soil. The leakage resistance of the rail to the ground is generally 5-100 Ω/km [17][18][19]. When the subway train is running, the leakage current flows into the ground through the leakage resistance, forming a moving leakage current source.…”

Section: A the Mechanism Of Stray Current Generationmentioning

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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“…Theoretically, it was assumed that U rg is negative at the substation and positive at the point where the current leaks from the rail. In [78], the authors analyzed the rail potential in front of seven substations in urban and suburban areas and concluded that the rail potential can be positive in urban areas and negative in suburban areas. This means that stray current can flow from the rail to the ground in urban areas and flow back to the rail in suburban areas.…”

Section: Monitoring and Maintenance During Track Lifetimementioning

confidence: 99%

Measures and Prescriptions to Reduce Stray Current in the Design of New Track Corridors

Vranešić,

Bhagat,

Mariscotti

et al. 2023

Energies

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Stray currents can cause very rapid degradation and material loss at the points where the current leaves the metal and enters the electrolyte. Nowadays, many resources are invested in the protection of jeopardized structures, such as buried pipelines, from stray current corrosion. This paper describes the measures that need to be considered in the design and construction of track structures to ensure high rail-to-ground resistance and consequently reduce stray currents. The main conclusions from existing guidelines and standards for reducing and controlling stray currents that are applied by various track operators are presented in the paper. Rail-to-ground resistance in different types of tracks structures and rail fastening systems is analyzed, and the optimal type of the track and type of the fastening system is defined. The grounding schemes used on the tracks and their influence on stray current values are described, as well as the influence of traction power stations (TPS) and rail cross bonding on stray current. Since it is not necessary to apply all the measures described to the same track structure, the paper gives recommendations on which measures to apply when building tracks with continuously fastened rails and which to apply when building tracks with discretely supported and fastened rails.

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Measurements and calculations of rail potential in D. C. traction power supply system

Cited by 7 publications

References 0 publications

Dynamic Stray Current Measuring Methods in Urban Areas

Dynamic Stray Current Measuring Methods in Urban Areas

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

Measures and Prescriptions to Reduce Stray Current in the Design of New Track Corridors

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