Thevenin equivalent (symbolic circuit calculation)

  • #1

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


upload_2018-10-1_15-35-42.png




upload_2018-10-1_15-35-31.png



The Attempt at a Solution


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

upload_2018-10-1_15-42-33.png


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

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Answers and Replies

  • #2
phinds
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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.
 
  • #3
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
 
  • #4
phinds
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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?
 
  • #5
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
 
  • #6
phinds
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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.
 
  • #7
gneill
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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.
 
  • #8
You did not answer my question.
Sorry I did not quite get what you are asking for?
 
  • #9
phinds
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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.
 

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