Why is zero sequence impedance high of transmission line?
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Sequence Impedance. ... Positive Sequence Impedance – The impedance offered by the network to the flow of positive sequence current is called the positive sequence impedance. The positive sequence means all the electrical quantities are numerically equal and displaces each other by 120º.
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The impedance offered by the system to the flow of zero sequence current is known as zero sequence impedance. ... This is because the three zero sequence current at any point in a electrical power system, being in phase, do not sum to zero but must return through the neutral and /or earth.
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