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happyDaisy
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Join Date: Feb 2010
Location: Thimphu, Bhutan
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Power House Dimensioning from Generator Sizing

02/08/2010 5:40 AM

Hi everyone, does any one have any idea as how I can dimension the Power House from the basic generator dimensioning?? Beside stator diameter of the generator, what other parameters I have to consider???

I would appreciate any kind of inputs/ feedback.

Thank you so much!

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Tim in Mexico
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#1

Re: Power House Dimensioning from Generator Sizing

02/08/2010 8:17 AM

Two important considerations that come into play are;

Cooling, you need to be sure you can move sufficient air in and out of the enclosure.

MAINTENANCE, you now have the opportunity to be sure the unit is sized properly for scheduled maintenance on both the driver and the generator. This largely depends upon the specific manufacturers requirements, so look at this closely.

It may be that a major overhaul would require removing the unit from its enclosure, but you wouldn't want to do this to accomplish routine maintenance.

I hope these considerations help.

Tim
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happyDaisy
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Location: Thimphu, Bhutan
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#2
In reply to #1

Re: Power House Dimensioning from Generator Sizing

02/08/2010 10:03 PM

Hi Tim, thank you so much for the inputs. Yeah,that are very important factor to be considered.

I have seen some formula calculating the the dimension of Power House somewhere. I remember them taking the size of turbine housing and stator dia of generator along with some clearance between units and all. So, can u help me with mathematical calculation aspect??

I will try on my part too.

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gordheth
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#3

Re: Power House Dimensioning from Generator Sizing

02/08/2010 11:18 PM

I am not sure about formulas based on the diameter of the rotor. But, based on my exerience overhauling turbiue generators, here are some thoughts on plant size.

Besides the foot print of the machine, there needs to be enough exciter end wall clearance to pull the rotor from the generator. This is very important and if not provided the rotor will have to be passed through an opening in the end wall.

You should also allow enough clearance on the turbine deck to position the turbine casing and rotor. This means that on one side of the machine if possible allow 1 1/2 times the width of the turbine cover for the width and walkways. Allow a minimum of the generator width to one side for generator rotor laydown and access for service. On the non laydown side allow room for a 5 to 6 foot walkway.

If the generator is on a second floor, allow enough area in the drop zone for the longest casing or rotor length (which could be the generator rotor) and largest width which is the turbine cover.

Its best to have the drop opening, if the generator is on a second floor, at the turbine end of the machine. If not though, ensure the height of the plant is sufficient to lift the casing and rotor over the generator and its cooler with the overhead crane. Otherwise you run into handling issues with the rotor and casings.

When laying out the floor space, ensure that bus ducts and cooling piping for the generator are considered. Try to keep these as close the machine as possible as oposed to running elevated through plant otherwise the access to availble floor space will be very confined.

The plant also has to allow enough room to get a transport truck float inside for loading rotors and casings when required.
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happyDaisy
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Location: Thimphu, Bhutan
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#4
In reply to #3

Re: Power House Dimensioning from Generator Sizing

02/09/2010 1:57 AM

Hi gordheth, thank you so much for the information. I really appreciate it.

Again I have one question, if i have the diameter of turbine say pelton wheel in this case, in order to calculate the dimension of turbine housing, I think we have to take the diameter of wheel plus some factor times width of bucket. Am I right??? Please do throw some light on it too. I had asked everyone around me and no one seem to have any concrete idea about it. Beside it is my first time doing such design work.

Thanks!

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gordheth
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#5

Re: Power House Dimensioning from Generator Sizing

02/09/2010 8:17 AM

With a hydro turbine (Pelton) you are correct. There is a suggested space allocation.

I have that information here somewhere so I will have a look and get you the name of the reference. I will be later today. One thing is though, the generator speed in this case will be important too as the diameter of the rotor will be set by the number of poles.
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Brave Sir Robin
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#6

Re: Power House Dimensioning from Generator Sizing

02/09/2010 10:56 AM

When I know nothing about an installation (most true in this case) I will ask the manufacturer of the equipment what they recommend as a starting point.
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gordheth
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#7

Re: Power House Dimensioning from Generator Sizing

02/09/2010 11:27 AM

The Hydropower Engineering Handbook ISBN 0-07-025193-2 is a good reference book. But the only proportioning sizes for layouts I see in it is the relation of the runner diameter to penstock and draft tube sizes. Nothing for the generator.

It still a good handbook though if you are considering a development project for a hydro station and are too far in advance for equipment offers. I got mine at Amazon a few years ago.
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happyDaisy
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Location: Thimphu, Bhutan
Posts: 16
#8
In reply to #7

Re: Power House Dimensioning from Generator Sizing

02/09/2010 10:31 PM

Gordeth, thank you so much. I have noted down the reference book you have suggested and I will purchase it. But problem is, it might take time to reach here. Maybe you can share the relevant excerpts from the book in here or in email regarding the turbine house dimensioing that you mentioned in your post. I hope it won't violate the copyrights laws.

Sir Brave John, I need these basic data for my PFS( Pre Feasibility studies), so in no way does manufacture comes into picture here right now. Morever, suppliers are not really eager to share their design knowledge as far as I know.

Good day/ evening to you all!

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gordheth
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#9

Re: Power House Dimensioning from Generator Sizing

02/09/2010 10:38 PM

Probably best to email pdf scans of the pages I think might apply. I am new to this and am not quite sure how to access your email address from this site. I am not sure on the copy right issues but I think a few pages will be ok. I am sure it might be available thru a few sources.
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happyDaisy
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Location: Thimphu, Bhutan
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#10
In reply to #9

Re: Power House Dimensioning from Generator Sizing

02/09/2010 10:51 PM

Gordheth, Please do email me the information. You can mail me at peyangd@hotmail.com. You are the best!!!

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sauravbabu
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#11
In reply to #10

Re: Power House Dimensioning from Generator Sizing

12/20/2013 4:24 AM

hi,

please also send me the email. I also need it desperately.

Thanks.

sks
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Brave Sir Robin (1); gordheth (4); happyDaisy (4); sauravbabu (1); Tim in Mexico (1)

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