Wow, very interesting information, thanks a lot! Could you please explain how do cars test the quality of ground connection? Typical example the Zoe is very demanding on this condition. I always wondered how can a car check the ground loop resistance if it sits on insulating rubber tyres.
Very good Question! There is no earth ground connection, and it is also not needed. You should think of the car itself as "ground" in the animation around 3:27 So the test there is from HV- or HV+ to the vehicle chassis. Not to ground on the grid, or an earth rod. I did actually use the wrong symbol there, I should have used "Chassis Ground" rather than "Earth Ground". Your Zoe will probably measure resistance between it's chassis and the HV bus. Another technique is to inject a known waveform in the HV bus, and then observe the "Chassis Ground" - hopefully it will not show up there too!
Thank you for this 😊
Wow, very interesting information, thanks a lot! Could you please explain how do cars test the quality of ground connection? Typical example the Zoe is very demanding on this condition. I always wondered how can a car check the ground loop resistance if it sits on insulating rubber tyres.
Very good Question! There is no earth ground connection, and it is also not needed. You should think of the car itself as "ground" in the animation around 3:27
So the test there is from HV- or HV+ to the vehicle chassis. Not to ground on the grid, or an earth rod.
I did actually use the wrong symbol there, I should have used "Chassis Ground" rather than "Earth Ground".
Your Zoe will probably measure resistance between it's chassis and the HV bus. Another technique is to inject a known waveform in the HV bus, and then observe the "Chassis Ground" - hopefully it will not show up there too!