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From: RAGAVENDAR on 29 Jul 2010 02:05
Hi All

I am Doing a Simulation which involves Connection of 1 MW Wind Turbine & Squirrel Cage Induction Generator to the Grid which is considered as Programmable Voltage Source.By Directly Connecting 1MW,600V,50Hz Squirrel Cage Asynchronous Machine in Pu Units to Programmable Voltage Source(GRid) of 600V and 50 Hz I am Getting the result.

But If i inserted the Transformer of 600V/6KV Three Phase Two Winding Transformer in between Grid and Asynchronous machine and the Programmable Voltage source(Grid) voltage is Changed from 600V to 6KV ,I Got an Error there should Series resistance component between so i inserted three phase series resistance of 1 ohm, i got simulation started running.But it takes lot of Time and answer also not correct.

In My View RL or RC Time Constant Making Sense here So any body please Explain about this How to calculate RC or RL Time Constant for the Simulation How to arrive at optimum Time Constant...

Please Explain it...
From: Frank W. on 30 Jul 2010 03:42
> But If i inserted the Transformer of 600V/6KV Three Phase Two Winding >Transformer in between Grid and Asynchronous machine and the Programmable >Voltage source(Grid) voltage is Changed from 600V to 6KV ,I Got an Error there >should Series resistance component between so i inserted three phase series >resistance of 1 ohm, i got simulation started running.But it takes lot of Time and >answer also not correct.
I am sure that the simulation results are correct. The transformer parameters on the primary side determine, together with the series resistance, the phase currents . These currents will then lead to a voltage drop across the seriens resistance so that its no more 6kV on the primary side of the transformer. Thus, the whole system will have of course a different behaviour.

> In My View RL or RC Time Constant Making Sense here.
Why that? If there is a real transformer depending on its design all parameters that you have to enter as the block parameters will have to be calculated. Sorry, but if you want to simulate a real system there is no other way. If you are interested in the general behaviour you should use simple models for each component of the real system. But one should be familiar with the basic behaviour of each element because otherwise such a reduced model is error prone. Then calculations of RL and RC time constants might be useful.
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