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Review ListComprehensive Modelling and Simulation of Stray Current in DC Railway System
Abdollahi Dam Abi, Hossein | 2020
636
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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 53385 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Mokhtari, Hossein
- Abstract:
- In urban rail (subway) substations, high voltage dc (750 V) is usually used to feed the traction motors of the wagons. This type of feeding raises issues, including the creation of stray currents in different parts of the structure. The cause of the stray current is the voltage difference between the two points of the rails, caused by the current flowing inside the rails. These currents accelerate the corrosion process in and around metallic equipment. One of the most dangerous issues is the corrosion of gas pipes near the subway that has caused disasters in the past. The stray current cannot be eliminated and its maximum reduction requires high costs. For this reason, different standards have been defined to determine the permissible range of stray current, which are defined by the corrosion limit of metallic devices around the subway, and these standards must also be considered during operation in addition to the design process. The stray current cannot be measured directly, as the whole rail is the departure or entry point of the stray current. Consequently, to estimate the stray current, we have to use the electric train model, the rail network and the ground. The stray current estimation requires a thorough understanding of the stray current, rail network parameters including voltage and current, the surrounding rail environment such as the ground and adjacent metal equipment, and finally the relationship between the above. This allows to estimate the stray flow rate and to calculate the corrosion rate in the adjacent equipment. This thesis deals with the modeling and simulation of the subway electric system and the estimation of stray currents
- Keywords:
- Corrosion ; Electric Urban Railway Transportation ; Rail Vehicle System ; Stray Current ; Rail-to-Ground Resistance ; Rail-to-Ground Voltage ; Direct Current Railway System
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