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# Capability Curve 3512C

04/06/2017 3:11 PM

Dear Enginners, good morning

I'm triyiing to create a Capability curve for a 3512C (1365KW) in order to model in ETAP, Some have a document with this? or maybe could explain me how to do it?

Best Regards

Sergio

Pathfinder Tags: Capability Curve
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#1

### Re: Capability Curve 3512C

04/06/2017 3:38 PM

Contact Caterpillar directly or search the web.

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#2

### Re: Capability Curve 3512C

04/06/2017 4:43 PM
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#3

### Re: Capability Curve 3512C

04/06/2017 9:40 PM

Late afternoon here. This is a global website.

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#4

### Re: Capability Curve 3512C

04/08/2017 5:12 PM

See:

https://neos-guide.org/sites/default/files/capability_curves.pdf

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#5

### Re: Capability Curve 3512C

04/09/2017 4:44 AM

In order to draw the capability curve you need the following data:

frequency 60 Hz; rated active power=1365 kW; rated apparent power=1950 kVA

power factor=0.7; rated voltage[Vp]=600 V; excitation maximum ratio Efmax/Efrated=1.5; synchronous reactance [xd%]=220.

Some of these you may find in here:

http://www.allnesales.com/oilriggenerators2.pdf

Efmax/Efrated and xd% are appreciated.

The curve actually represents voltages [Vp,E,Ia*Xs] but could be translated in power[where it is required] if you multiply by Vp and divide by Xs.

Xs=Vp^2/S*xd%/100 ohm [Vp=0.6 kV; S=1.95 MVA]

Ef=sqrt(3)*(Vp/sqrt(3)+Ia*Xs*sin(f)+j*Ia*Xs*cos(f)) Complex numbers.

You may start by Pmax=1365 kW [GP=Pmax/Vp*Xs] up the point c where it intersects circle of radius OB=Smax/Vp*Xs and the center in O.

This circle intersects the second circle of radius GH=Efmax and the c

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