Abstract
This work deals with the problem of the diagnosis of two shunt faults in a high-voltage direct current (HVDC) transmission line modeled by a set of linear partial differential equations. Because the fault scenario of a transmission line subject to two simultaneous shunts is indistinguishable from measurements at the boundaries in steady state, a sequential fault scenario is assumed in this work. This consideration allows estimating on-line the magnitude of the shunt current and the position for a weighted average fault by using the magnitude position fault estimator (MPFE), and also isolating the faults by recording the data history of the line. To identify the sequence of faults from the error of the MPFE, a new weighted average position relation (WAPR) is derived, which is part of the main contribution. Thus, the solution consists of a combination of detection and isolation stages; the first one determines the presence of weighted average shunt faults through an MPFE. Furthermore, the second one uses historical data to calculate the physical fault parameters. Simulations for HVDC transmission line data by ATPDraw show the performance of the approach.
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