SilverArc
Electrical
- Sep 20, 2006
- 82
Hi,
I read possibly all the threads on soft starts but my questions about soft starters still remain unanswered. In this part of the thread, I will just explain the background and a small question and as the project will progress I might have some more questions to ask depending upon the dilemma I encounter.
For now only: I have a 300 HP twin-screw compressor (I have no clue about the mechanical loading char. of this load)
A 250 HP axial vent fan (which might be reversed) for a mining application,
I was asked to specify type of motor and starters for this application:
I called the sales engineer for both manf. and the compressor guy advised me a star-delta starter and the fans guy advised me a soft start, as the price is competitive.
I read the FAQ section and some other literature from ABB about selection criteria of starter methods but I guess it helped a little bit. Anyways,
I went through the manual of a soft starter and it has so many settings to be done and being a consulting engineer, I have to advise the contractor about it. I have to still work on settings my self and after my homework, I will come back to this part in near future.
For now
Q # 1 When I was reading a readymade specs from a soft-starter manfu, It talks about the term” High resistance ground" with the starter. How grounding has anything to do with type of grounding of the system? Kindly advise
JRAEF: I apologize, I am sneaking another question:
Could you advise me some grounding literature in IEEE or any part of web.. where I could find out of a situation where I might have two substations in vicinity or a hydroelectric substation and a step up transformer station. I am not, sure what distance makes it mandatory for two sites to be connected with each others grounding grid. If you have some distance that would help.
Regards,
I read possibly all the threads on soft starts but my questions about soft starters still remain unanswered. In this part of the thread, I will just explain the background and a small question and as the project will progress I might have some more questions to ask depending upon the dilemma I encounter.
For now only: I have a 300 HP twin-screw compressor (I have no clue about the mechanical loading char. of this load)
A 250 HP axial vent fan (which might be reversed) for a mining application,
I was asked to specify type of motor and starters for this application:
I called the sales engineer for both manf. and the compressor guy advised me a star-delta starter and the fans guy advised me a soft start, as the price is competitive.
I read the FAQ section and some other literature from ABB about selection criteria of starter methods but I guess it helped a little bit. Anyways,
I went through the manual of a soft starter and it has so many settings to be done and being a consulting engineer, I have to advise the contractor about it. I have to still work on settings my self and after my homework, I will come back to this part in near future.
For now
Q # 1 When I was reading a readymade specs from a soft-starter manfu, It talks about the term” High resistance ground" with the starter. How grounding has anything to do with type of grounding of the system? Kindly advise
JRAEF: I apologize, I am sneaking another question:
Could you advise me some grounding literature in IEEE or any part of web.. where I could find out of a situation where I might have two substations in vicinity or a hydroelectric substation and a step up transformer station. I am not, sure what distance makes it mandatory for two sites to be connected with each others grounding grid. If you have some distance that would help.
Regards,