Star-Delta Resistance Conversion

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In summary, Star-Delta Resistance Conversion is a method used to convert a three-phase electrical circuit from a star (Y) configuration to a delta (Δ) configuration or vice versa. It is necessary in situations where the load connected to the circuit requires different voltage and current ratings compared to the power supply. This conversion can be performed manually by rearranging the connections or automatically using a star-delta starter. Its advantages include reducing voltage and current ratings, minimizing power losses, and ensuring balanced current among the three phases. However, it is limited to three-phase circuits and may not be suitable for sensitive or complex components.
  • #1
zorro
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Homework Statement


Find the effective resistance between the points A and B.


The Attempt at a Solution



The circuit is a hexagon as shown in the image.
I used star-delta method to convert upper and lower deltas respectively into Ys and then did some simplification. However, I'm stuck up at one place. Refer the two figures.
Please help.
 

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  • #2
I think you over-think it. Notice that the circuit is shorted at 3 points M, N and P. Simplify the circuit and it comes down to a simple problem :biggrin:
 

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  • #3
Oh! yeaah...it is a very simple problem
Thanks!
 

1. What is Star-Delta Resistance Conversion?

Star-Delta Resistance Conversion is a method used to convert a three-phase electrical circuit from a star (Y) configuration to a delta (Δ) configuration or vice versa. This conversion is mainly done to match the impedance and current ratings of the electrical components in the circuit.

2. Why is Star-Delta Resistance Conversion necessary?

Star-Delta Resistance Conversion is necessary in situations where the load connected to the circuit requires different voltage and current ratings compared to the power supply. It is also useful in maintaining balanced current among the three phases of the circuit, reducing voltage drops and power losses.

3. How is Star-Delta Resistance Conversion performed?

Star-Delta Resistance Conversion can be performed either manually by reconfiguring the electrical connections of the circuit or automatically using a star-delta starter. In manual conversion, the connections of the three phases are rearranged to form a delta or star configuration. In an automatic conversion, a star-delta starter is used to switch the connections automatically.

4. What are the advantages of Star-Delta Resistance Conversion?

Star-Delta Resistance Conversion offers several advantages, including reducing the voltage and current ratings of the circuit, minimizing power losses and voltage drops, and increasing the efficiency of the circuit. It also ensures balanced current among the three phases, preventing overload on any particular phase.

5. Are there any limitations to Star-Delta Resistance Conversion?

Yes, there are a few limitations to Star-Delta Resistance Conversion. It is only suitable for three-phase circuits and cannot be applied to single-phase circuits. Additionally, it may not be suitable for circuits with sensitive or complex electrical components, and it may increase the complexity of the circuit's wiring and connections.

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