Abstract
Parallel lines are utilized to enhance the reliability and security of energy. Mutual impedance arises when transmission lines are parallel lines on a common right way. In this study, a system model to observed mutual impedance effect between parallel disrupted lines and under maintenance line are explained. The system model is validated using actual recorded fault current waveform. The simulation result shows that when disconnector of the under maintenance line open and grounded on both side, the line mutual current will be high. On the other hand, when disconnector open and gorunded only on one side, the line mutual current will be low but the voltage will be high.
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