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sreenivasan1962
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Join Date: Oct 2009
Posts: 11

Starter for 900KW, 6.6KV AC Motor

10/31/2009 3:35 AM

How to start a set of six motors one after the other? KW: 900 KV: 6.6, 3 Phase, 50HZ Prefered staring method: Soft start Load: Hydraulic Pumps one on each side of Double shaft Motors. Motor starts on about 20% of full load. Reputed make preffered.
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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

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#1

Re: Starter for 900KW, 6.6KV AC Motor

10/31/2009 8:08 PM

6 separate soft starters.

If you had in mind using one soft starter and switching it bacl and forth between the 6 motors, forget it. It does not work out to be beneficial. The necessary switches, contactors and isolators necessary as well as the custome bus ork and engineering ends up costing almost as much as buying 6 separate soft starters. Then you also have the problem that the soft starters have a limited duty cycle, so you may end up needing to allow it to cool down for an hour or so in between starts.

Solcon is a good reputable manufacturer, but where are you? If there is no support for a product in your country, the most reputable product in the world can become a nightmare.

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sreenivasan1962
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#2
In reply to #1

Re: Starter for 900KW, 6.6KV AC Motor

10/31/2009 10:25 PM

Dear JRaef, Thanks for the advice. I plan to use separate starters for each motor. I would like to have advice on selecting the type of starting for my application, the protections required, parameters to be monitored etc. I am in India and service support is also important. Sreenivasan
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electricalexpert65
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Posts: 2061
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#3
In reply to #2

Re: Starter for 900KW, 6.6KV AC Motor

11/01/2009 5:21 AM

If you are in India, try any of the following makes:

SIEMENS

L & T

ABB

SCHNEDIER
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JRaef
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#4
In reply to #3

Re: Starter for 900KW, 6.6KV AC Motor

11/01/2009 7:29 PM

Siemens in India brand labels the Solcon soft starters

L&T does not seem to offer MV soft starters, only 400V

ABB and Schneider both brand label a MV soft starter made by a company called Motortronics from Florida (USA), but neither of them have good after market support in India, they rely upon Motortronics technicians to fly out from the US. The other people who sell that same Mototronics product in India and have their own local support for it is Elletronica Santerno. I think the product has problems however.

Solcon has a partner sales and support organization in India called Emco-Kimo in Mumbai, plus their product is also brand labeled by Igel GMBH, who also has distributors in India.

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Einar Runarsson
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#6
In reply to #4

Re: Starter for 900KW, 6.6KV AC Motor

06/15/2012 5:32 AM

Do you have overview of the brands Solcon, AuCom NZ and Motortronics label to - I'm mostly interested in LV.
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JRaef
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#7
In reply to #6

Re: Starter for 900KW, 6.6KV AC Motor

06/15/2012 12:10 PM

Solcon, good mfr with a long history and success record, but limited support staff outside of Israel where they are located because they are a small company. They do have a few partners around the world that help though, such as Igel in Germany.

Aucon NZ, the new kids on the block for MV, very few installed units compared to others, still risky in my opinion unless you are in NZ or Australia where they have local support.

Motortronics: I used to work there but no longer. They are a small company that brand-labels their products to a lot of other companies like GE, Toshiba, ABB, Shcneider and Siemens in some parts of the world (Solcon supplies Siemens in other areas). If you are buying Motortronics from one of their partners who has local support, they are OK. But if you are buying direct from Motortronics, they have a very limited support staff for flying all over the world and they often have to support their big partners first. So if there is a problem, your potential for long down time waiting for them is greater.

Not mentioned, Rockwell / A-B. Good product, extensive and highly trained support staff all over the world, great reputation. They make their own, no brand-label deals.

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Khor
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Join Date: Sep 2009
Posts: 59
Good Answers: 3
#5

Re: Starter for 900KW, 6.6KV AC Motor

11/11/2009 9:31 PM

You can use 6.6kv auto-trans starters.It will involve autotransformers (oil immersed or cast resin type),6.6Kv Vacuum contactors,analogue or digital controller and protection relays for motor starters.Main 6.6KV switchboard.This is a simpler and trouble free starter when designed by experienced consultant/manufacturing engineers.

It is important to obtain from motor and mechanical system manufacturers,the sufficient starting and running imformation of motors in terms of inrush current,starting current at the mechanical torque needed,type of liquid/gas to be pumped,number of start-stop per hour,tapping percentage of each tapping,number of steps, of autotrans, and kva sizing of autotrans.Many so called "big and advance" electrical company cannot design and built such starters.They will point fingers at others when components starts to burn .Look for those companies who has longer experience and you will be alright.I was involved in many such starters used in water pumping and gas compression projects.

Regards,

Khor.
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Users who posted comments:

Einar Runarsson (1); electricalexpert65 (1); JRaef (3); Khor (1); sreenivasan1962 (1)

Previous in Forum: Voltage drop booster for AC Generator   Next in Forum: problem with motor
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