arnolde wrote:I'm building an EV with a 660V pack (400V AC motor), and I'm a little worried about what kind of fuse and contactor to use. At upto 800VDC/20A (during regen) the fuse and contactor between batterypack and controller must be high-voltage, spark retarding type. Any ideas?
I'm worried about you building a vehicle at that voltage.
My question would be why? I've been involved with several high voltage EV's, but noting remotely at that level. You're going to be struggling to find cable rated at above 600 volt and DC
rated fuses are going to be really scarce.
The best I could find so far is a solid-state switch 25A/800VDC which costs 150 EUR.
There are contactors rated at suitable voltages, the Killovac EV200 for example http://relays.tycoelectronics.com/datasheets/ev200.pdf
or the Gigavac (guess how they came up with that name) GX12 http://www.gigavac.com/products/contact ... /index.htm
Unfortunately the controller (SEW MDV60A) has no power-off or standby mode, so I need to break the battery DC circuit manually when shutting down.
Which model of MDV60A? The largest 440VAC model only has a maximum phase current of 100amp. Typically industrial AC motor controllers only have a low speed torque boost of 2:1, EV practice is more like 4:1. This is usually achieved by reconfiguring the motor windings in parallel, turning a 220volt motor into 110volt or lower. That way you can keep the V/F ratio normal further up the rev range.