SilverArc
Electrical
- Sep 20, 2006
- 82
Hi Everybody,
I have this thread in two sections. This is related to a mine hoisting application and in some earlier threads I have seeked your suggestions and they were very useful. Now the project is with a company that is involved in mine hoisting applications design. We being the consulting engineers are questioning their design and they are unable to provide satisfactory answers.
Q#1 The application is at 3000 m above sea level. The motor size is 1500 HP. It was advised to us earlier that a VFD for 1500 HP motor is only available in medium voltage specially regenerative and medium volatge drives needs to be derated both for voltage as well as current.
Now, they said we can use a low volatge drive 600 V, VSI,
becuse low voltage drives don't need to be derated for voltage, it is only derated for current.
They could not justify that why VFD needs to be derated for volatge for medium voltage and not for Low voltage.
They meant by derating of voltage means, that a 1000 V VFD will be suupied with 780 V some thing like that.
Could you advise, what is correct here.
Q#2 What would be a differnce in terms of performace issue in comparison of Active front end Current Source VFD and Active front end Voltage Source VFD.
Thanks
I have this thread in two sections. This is related to a mine hoisting application and in some earlier threads I have seeked your suggestions and they were very useful. Now the project is with a company that is involved in mine hoisting applications design. We being the consulting engineers are questioning their design and they are unable to provide satisfactory answers.
Q#1 The application is at 3000 m above sea level. The motor size is 1500 HP. It was advised to us earlier that a VFD for 1500 HP motor is only available in medium voltage specially regenerative and medium volatge drives needs to be derated both for voltage as well as current.
Now, they said we can use a low volatge drive 600 V, VSI,
becuse low voltage drives don't need to be derated for voltage, it is only derated for current.
They could not justify that why VFD needs to be derated for volatge for medium voltage and not for Low voltage.
They meant by derating of voltage means, that a 1000 V VFD will be suupied with 780 V some thing like that.
Could you advise, what is correct here.
Q#2 What would be a differnce in terms of performace issue in comparison of Active front end Current Source VFD and Active front end Voltage Source VFD.
Thanks