Asking about Basic of Software ETAP

[uconalpukat]

Hai, I'd attach file (pic of my simulation in ETAP)

I have several question:
1. Look at transformer. Input of transformer has 325+147j and output has 323+139j. Why this thing happen? Transformer lost around 2 KW.

2. Motor need 300KW, but the input supply more than 300K, is 323+139j. Why this thing happen?

Notice: Don't look at power of generator. I know its false. Because output of generator depends from motor.
Generator will give any power to motor as long as motor need.

Thank you so much.

 

[desrod]

There are a lot of missing data that you forgot to consider/show. How did you model your motor? Nominal voltage? PF? all that will influence your load-flow. What is the impedance of your transformer? size?
I would recommend that you do the load-flow by hand and then check with your simulation results. You should then be able to find your answers by yourself especially if your entered the wrong data. Entering proper transformer impedance on % value can be tricky for inexperienced users.

You also need to understand how power system software works. You can't say that the power of generator is false without checking how you modeled it. You likely defined it as a swing bus and put a 230 kW label on it and labels are not used by the software. If your generator was really 230 kW, I would have expected the Bus1 voltage not to be at 100%. Remember that in simulation the simple principle of "garbage in, garbage out" applies all the time.

You might want to work with an experienced colleague looking over your shoulder for a couple of simulations. Welcome to the power system simulation world, it's fun and always challenging.

 

[LionelHutz]

1. The difference is the losses in the transformer.

2. Your motor model is wrong. It's being overloaded.

 

[uconalpukat]

@desrod
I am new in power electric system also new in ETAP.
You are right. I entering another %Z value in impedance of transformer and the result is different.

Do you have any recommended link to learn power system (load flow) and also learn ETAP?
I am glad if you have one for me.

Thanks for your help.

@lionelhutz
thank you so much for you kind reply.

 

[desrod]

You can check the web for references. There are a number of good books you might be able to get at your school or company library.I would have given you some title but they are likely out of the market since I finish eng school 35 years ago.
I don't use ETAP so I am not aware of their training offer but I know that CYME has video training on their site (and yes I am a CYMDIST user). Check with other ETAP users, they might have some references for you.
I don't know about your situation but I believe the fastest way to learn is by tagging along with a more experienced colleague or enlist him to coach you while performing your study.
Regards,
Daniel

 

[Mila15]

The 300KW is the motor output power, while the 325KW is input power. Your effeciency must be around 92.3%. As far as transformer loss, that is normal and does change for different impedence values.

 

[uconalpukat]

@desrod
ya, I will ask someone that experienced in ETAP to coach me.
Thanks for your advice desrod.

@michaelusa
Ya, you are right my eff around 92.3%. I think is default for motor in ETAP.
Thanks for your kind reply.

 

[LionelHutz]

There are a bunch of video tutorials on the Etap web site.