Electric Vehicles Charge 1

[Skinbleu]

Greetings everyone

I work at a company that sells chargers for electric vehicles and I’m working on the electrical projects.
The chargers I work with, are alternating current (AC) and the main mode here is a three-phase installation 220 V, at 7.04 kW with a current of 32 amps.

If the system only had three chargers (Q01, Q02, Q03), the current for each would be 32 amps.
Using a simulator, when adding the fourth charger(Q4), the current goes to 84 amps and I wanted to understand why.
I tried to draw the three-phase circuit to make an equivalence of loads, but I couldn’t get to that value.
Does an electric car behave like a delta or star load?

 

[jghrist]

Is it 220 V phase-phase? If so, 32 A line current would be 32 * 220 * sqrt(3) / 1000 = 12.2 kVA
Your loads are connected delta. You could connect them star if you had a neutral. Your diagram shows four single phase loads connected phase-phase and will be unbalanced. You could add up the currents vectorially to determine the line currents.

 

[itsmoked]

Does an electric car behave like a delta or star load?

If the chargers only have 2 current carrying wires going to them they don't act like any kind of three phase load! Neither wye or delta.

Any chance you could find three phase input chargers? They'd be the way to go in your case.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[jghrist]

From what I've seen, you have a choice of plugging 120 V or 240 V single phase into your electric car or using a DC fast charger. I assume that you are making a DC fast charger that is powered by three phase AC. I think you would use a wye connected three phase bridge rectifier. Input would be 220/380 or 230/400 V in IEC land; 120/208 or 277/480 V in North America.