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In order to deal with the pole to pole fault of DC transmission line, this paper presents a protection method based on current limiting inductance. In this scheme, the current limiting reactor is used as the boundary element, and the correlation criterion is constructed by the first derivative of current and voltage of the current limiting reactance to distinguish the faults inside and outside the region. Under the specified reference direction, when there is fault in the line area, the inductive voltage and current at both ends of the line are the related reference directions, and the correlation coefficient symbols are the same. In case of external fault, the far fault point inductive voltage and current are the related reference directions, while the near fault point inductive voltage and current are the non-related reference directions, and the correlation coefficient symbols are opposite. According to this difference, a protection scheme is constructed to identify the fault. The scheme uses the electric quantity at both ends and is not affected by the transition resistance. A large number of simulation experiments show that the scheme can accurately identify faults inside and outside the region.
Inspec keywords: fault current limiters; fault diagnosis; DC transmission networks; power transmission faults; power transmission lines; power transmission protection
Subjects: d.c. transmission; Protection apparatus; Power system protection