Abstract
Mutual impedance generated by the double circuit lines become such a challenge to be solved. Mutual induction arises when transmission line is a parallel line on a common right of way. In this study, a system model to observed mutual current effect on circulating current protection (CCP) system are explained. The system model is validated using actual recorded fault current waveform. In one and half breaker substation, the mutual current in maintenance line may cause CCP to pick up.
Highlights
The complexity of power system development, boost the use of double circuit transmission line
The influence of the mutual current on circulating current protection system based on real case condition is explained in this study
When the fault happen inside the circulating current protection (CCP) working area, the relay will be triggered and tripping 2 circuit breaker (AB: B or AB: A) sending direct transfer trip (DTT) signal to the opposite substation [8]
Summary
The complexity of power system development, boost the use of double circuit transmission line. On the other hand mutual impedance generated by the double circuit lines become such a challenge to be solved. Mutual induction arises when transmission line is a parallel line on a common right of way [2]. The problem of mutual impedance happens when unbalanced faults occur on one line causing induced current and voltage in the double circuit transmission line [3]. The influence of the zero sequence mutual impedance is about 70% of the zero sequence self-impedance when the parallel lines are mounted on the same tower [7]. The influence of the mutual current on circulating current protection system based on real case condition is explained in this study.
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