Abstract
Conductive Electric Road Systems (ERS) appear as a promising solution for the electrification of transportation, particularly for heavy vehicles and long-distance trips but also for light vehicles. Significant research efforts are currently devoted to the development of conductive ERS systems, with up to four pilot test sites with different technologies in operation only in Sweden. With the help of electric models and experimental measurements on a pilot test track, this article assesses the potential safety challenges associated with one aspect of this technology: the absence of a reliable protective earth connection while the vehicle is connected to the ERS power supply. The results highlight the importance of monitoring the chassis potential at all times and the need of an active safety mechanism to disconnect the vehicle from the ERS supply if a severe fault occurs.
Highlights
Electrification is nowadays one of the most widely spread strategies to reduce transport sector emissions [1]
These domains are isolated from one another: I) one domain is coupled to the high-voltage (HV) traction battery, with a high impedance with respect to both the vehicle’s chassis and the Electric Road Systems (ERS) power supply; II) one domain is coupled to the low-voltage system; and III) one domain is coupled to the ERS power supply, with a low impedance to its ground/earth potential
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Summary
Electrification is nowadays one of the most widely spread strategies to reduce transport sector emissions [1]. The automotive market is experiencing a remarkable development towards electrification, and for the passenger car segment, there is a wide offer of models with a full electric or a plug-in hybrid electric drivetrain, allowing for pure electric driving over most of the driven distances. In order to reduce the size of the battery while keeping the usability of the vehicle unchanged, dynamic charging could be used. Energy is transferred to the vehicle while in motion. This energy may be used to propel the vehicle and to charge the battery so that it can be used at a later stage. Electric Road Systems (ERS) represent the physical implementation of different dynamic charging principles: inductive, in which the power is transferred via coupled magnetic field, capacitive, using coupled electric field, and conductive, in which there is a physical connection, and the electric current flows directly between the electric road and the vehicle
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