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Chassis Potential Detection and Limitation with Conductive Electric Supply

Hagelin, Gustav LU (2015) In CODEN:LUTEDX/TEIE EIE920 20152
Industrial Electrical Engineering and Automation
Abstract
The automotive industry is in for significant changes in the years to come. With the acknowledgment of greenhouse gases as a major contribution to global temperature rise, energy usage sees a transition in favor of renewable sources. Adding the uncertainty of whether a peak-oil production is reached or not, fossil fuels are no longer considered reliable. In the wake of this, new candidates emerge as alternatives to the existing car fleet technology. Standards and regulations are continuously being updated to ensure safety and reliability, but it is ultimately up to the technology itself to adopt if it is to survive.

This project focus on personnel safety issues that arise from electric vehicle charging. Specifically, some new concepts... (More)
The automotive industry is in for significant changes in the years to come. With the acknowledgment of greenhouse gases as a major contribution to global temperature rise, energy usage sees a transition in favor of renewable sources. Adding the uncertainty of whether a peak-oil production is reached or not, fossil fuels are no longer considered reliable. In the wake of this, new candidates emerge as alternatives to the existing car fleet technology. Standards and regulations are continuously being updated to ensure safety and reliability, but it is ultimately up to the technology itself to adopt if it is to survive.

This project focus on personnel safety issues that arise from electric vehicle charging. Specifically, some new concepts of battery charging infringe on the possibility to use a safety ground connection to reduce the risk of electric shock. The project intent is to find an alternative solution for such concepts by means of active detection and limitation of the chassis potential.

The report shows promising results. Sensors mounted on the vehicle body can be used to collect a good ground reference without an actual safety ground connection. An on-board current source can then be used to make the chassis potential follow the reference. However, unresolved issues remain that needs to be addressed. These include a less insulated voltage class B system, a.c. signals that could potentially propagate to the electric chassis and uncertain resistivity values for plausible fault types. These should be evaluated in future work as well as constructing a physical model of the system. (Less)
Popular Abstract
An electric current that leak from grid to vehicle during battery recharging can be forced back before being a risk to humans. This is a new concept to ensure a low electric potential in the vehicle chassis. It differs greatly from conventional passive protective measures and may open up new possibilites for tomorrows charging technologies.
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author
Hagelin, Gustav LU
supervisor
organization
alternative title
Mätning och begränsning av chassipotential med konduktiva elvägsystem
course
EIE920 20152
year
type
H3 - Professional qualifications (4 Years - )
subject
keywords
protective earth connection, grid-connected electric vehicle, chassis potential, compensation current
publication/series
CODEN:LUTEDX/TEIE
report number
5364
language
English
id
8310301
date added to LUP
2015-12-11 12:47:31
date last changed
2015-12-11 12:47:31
@misc{8310301,
  abstract     = {The automotive industry is in for significant changes in the years to come. With the acknowledgment of greenhouse gases as a major contribution to global temperature rise, energy usage sees a transition in favor of renewable sources. Adding the uncertainty of whether a peak-oil production is reached or not, fossil fuels are no longer considered reliable. In the wake of this, new candidates emerge as alternatives to the existing car fleet technology. Standards and regulations are continuously being updated to ensure safety and reliability, but it is ultimately up to the technology itself to adopt if it is to survive.

This project focus on personnel safety issues that arise from electric vehicle charging. Specifically, some new concepts of battery charging infringe on the possibility to use a safety ground connection to reduce the risk of electric shock. The project intent is to find an alternative solution for such concepts by means of active detection and limitation of the chassis potential.

The report shows promising results. Sensors mounted on the vehicle body can be used to collect a good ground reference without an actual safety ground connection. An on-board current source can then be used to make the chassis potential follow the reference. However, unresolved issues remain that needs to be addressed. These include a less insulated voltage class B system, a.c. signals that could potentially propagate to the electric chassis and uncertain resistivity values for plausible fault types. These should be evaluated in future work as well as constructing a physical model of the system.},
  author       = {Hagelin, Gustav},
  keyword      = {protective earth connection,grid-connected electric vehicle,chassis potential,compensation current},
  language     = {eng},
  note         = {Student Paper},
  series       = {CODEN:LUTEDX/TEIE},
  title        = {Chassis Potential Detection and Limitation with Conductive Electric Supply},
  year         = {2015},
}