Thevenin equivalent (symbolic circuit calculation)

[Casper Hansen]

Homework Statement

I have trouble to find the right procedure to transform the circuit below to a thevenin equivalent.
I am looking for a symbolic solution a step by step guidance of where to start and how to add/locate all the impedance in series and parallel in order to calculate the sum of Z seen from point A and B

The Attempt at a Solution

[/B]
I have a hard time see which impedance are in series and parallel, as Z5, Z4 and Z3 forms a star connection to GND?

Would the solution be to make a form of star/delta transformation of the circuit in order to calculate the circuit?

 

[phinds]

You have to define the nodes between which you want the Thevenin equivalent. Without that your question has no answer.

Also, we don't DO "step by step" instructions. YOU do a step by step analysis and tell us when you get stuck.

 

[Casper Hansen]

You have to define the nodes between which you want the Thevenin equivalent. Without that your question has no answer.

Also, we don't DO "step by step" instructions. YOU do a step by step analysis and tell us when you get stuck.

My post have been updated with nodes A and B

 

[phinds]

My post have been updated with nodes A and B

Then a first step of getting the Thevenin Equivalent voltage should be REALLY easy. What is it?

 

[Casper Hansen]

Then a first step of getting the Thevenin Equivalent voltage should be REALLY easy. What is it?

If i know the voltage but need to find the sum of impedances in order to calculate the current

 

[phinds]

If i know the voltage but need to find the sum of impedances in order to calculate the current

You did not answer my question.

 

[gneill]

If i know the voltage but need to find the sum of impedances in order to calculate the current

You can find the current by using standard circuit analysis methods: basic KVL & KCL, Nodal Analysis, Mesh analysis... Take your pick.

Edit: Or, as you've stated, you could use a star-delta transform to begin reduction of the resistor network.

 

[Casper Hansen]

You did not answer my question.

Sorry I did not quite get what you are asking for?

 

[phinds]

Sorry I did not quite get what you are asking for?

"Then a first step of getting the Thevenin Equivalent voltage should be REALLY easy. What is it?" is asking you for the Thevenin Equivalent voltage. I don't see how I could have asked it any more plainly. What is the Thevenin Equivalent voltage, given the circuit you have drawn with the nodes you have drawn? Just LOOK.