Calculate the zero-sequence line impedance

In summary, the conversation discusses the calculation of sequence line impedance for a transmission line using parameters such as number of phases, frequency, and line length. The person asks if it is possible to calculate the impedance from these parameters and if the other person can show them how to do so. They also mention using L', C', r', and g' to calculate the characteristic impedance and provide a Wikipedia article as a helpful resource.
  • #1
minhduc515
12
1
Homework Statement
calculate sequence line impedance from MATLAB/simulink
Relevant Equations
How to calculate sequence line impedance from MATLAB/simulink ?
Hi. I want to calculate sequence line impedance of transmission line. But i can't find any parameter of Z1 and Z0 of transmission line in simulink.
244216

It's only have parameter about number of phase, frequency, R1/R0, L1/L0, C1/C0 and line length.
Can i calculate sequence line impedance from these parameters ?
 
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  • #2
Are you familiar with how to calculate the characteristic impedance of a transmission line from L', C', r' and g'? (where those are the inductance, etc, per unit length)...
 
  • #3
berkeman said:
Are you familiar with how to calculate the characteristic impedance of a transmission line from L', C', r' and g'? (where those are the inductance, etc, per unit length)...
Can you show me how to calculate impedance from these parameters ?
 
  • #4

1. What is zero-sequence line impedance?

Zero-sequence line impedance is the total impedance of a three-phase power system when all three phases are connected in parallel. It represents the resistance, inductance, and capacitance of the lines and equipment in the system.

2. Why is it important to calculate zero-sequence line impedance?

Calculating zero-sequence line impedance is important for analyzing the performance and stability of a three-phase power system. It helps identify potential issues such as unbalanced loads and ground faults, and allows for proper sizing of protective devices.

3. How is zero-sequence line impedance calculated?

Zero-sequence line impedance is calculated using the following formula: Z0 = Z1/3, where Z0 is the zero-sequence impedance, and Z1 is the positive-sequence impedance. The positive-sequence impedance can be calculated using the symmetrical components method.

4. What factors affect zero-sequence line impedance?

The main factors that affect zero-sequence line impedance are the length and type of the power lines, the configuration of the system, and the presence of any transformers or other equipment. Changes in any of these factors can alter the zero-sequence impedance of the system.

5. How can zero-sequence line impedance be reduced?

Zero-sequence line impedance can be reduced by using larger conductors, reducing the length of the power lines, or using different configurations such as delta-delta or wye-wye. Installing transformers with lower impedance can also help reduce the overall zero-sequence impedance of the system.

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