205v ac supply to EV charger

[spamwize2]

Hi I have a job at work, an ev charger keeps stopping functioning, the company that looks after it has been out and said its not there problem, the supply voltage is 205v ac, (I still need to check this) but is there a step up transformer out there that that can increase the voltage to 240v still keeping the current level? Any advice or tips appreciated.
Thanks

 

[DPG]

Hi I have a job at work, an ev charger keeps stopping functioning, the company that looks after it has been out and said its not there problem, the supply voltage is 205v ac, (I still need to check this) but is there a step up transformer out there that that can increase the voltage to 240v still keeping the current level? Any advice or tips appreciated.
Thanks

I think you need to find the problem that is causing the low supply voltage, rather than just try and bump it up. Is it an extremely long run? Did it ever work OK?

 

[spamwize2]

I think you need to find the problem that is causing the low supply voltage, rather than just try and bump it up. Is it an extremely long run? Did it ever work OK?

It is in a university, the supply is from a main intake which then goes through a filter with a pfc and smoothing circuit, resulting voltage output is 380v (seems pretty constant with the filter and pfc) I would presume from there it will goto a section board. The cable run seems to be about 300m and terminates in a small db which then goes to the ev charger around 50m further. it terminates in another db with 100a main switch and 2 32a mcbs and TT earthing arrangement. Dont know if it ever worked ok as this is the first complaint.

ps. the university substation is only 30m from main intake so ze should be very low, the whole side of this part of the buliding has lower than expected voltages, around 215 - 220v ac

 

[James]

I think you need to get some load on the circuits and check the voltage from phase to N at each stage leading back to the main intake.

but 380v only gives you 219v to start with so if you are getting 205v at the load end it suggests a 14v drop or 6%

so thinking again, it may be that the step down transformer supplying the site needs to be checked out in case it is overloaded or it might need the tapping's changing

 

[spamwize2]

I think you need to get some load on the circuits and check the voltage from phase to N at each stage leading back to the main intake.

but 380v only gives you 219v to start with so if you are getting 205v at the load end it suggests a 14v drop or 6%

so thinking again, it may be that the step down transformer supplying the site needs to be checked out in case it is overloaded or it might need the tapping's changing

Thats great I will do that tomorrow thanks for your advice

 

[DPG]

What's the application here?

 

[James]

What's the application here?

car charger

 

[DPG]

car charger

Oops, I thought I was on the thread about the unusual transformer! Doh.

 

[freddo]

then goes through a filter with a pfc and smoothing circuit

Is this 'filter' one of those BS voltage 'optimisers' ? If it is you can usually adjust the output voltage back to normal levels with a taps inside. 380V is really at the bottom end of things for a UK 3ph supply.