Combined solution for fault location in three-terminal lines based on wavelet transforms

Fault Detection and Location of IGBT Short-Circuit Failure in Modular Multilevel Converters

“…Continuous Wavelet Transform(CWT) is an effective time-frequency signal processing tool as it decomposes a signal in multiple scales or resolutions and retains both time and frequency domain information in the transform coefficients, which turns out to be useful in fault detection and location [28]. The CWT of a function f(t) with respect to a mother wavelet ψ(t) is defined as Equations (10) and (11) W…”

Recent techniques used in transmission line protection: A review

“…These fuzzy procedures solve the problem with simple computational procedures rather than using more complex algorithms in the deterministic way. Some more improved solutions to detect the faults precisely with wavelet transform based digital protection for transmission lines are proposed by Zhang et al, (2007), Valsan et al, (2009), Da silva et al, (2010. The combined techniques of WT with ANN and WT with Fuzzy Logic depend on huge samples and trainings for knowledge representation, leading to an excessively complicated job.…”

Distributed travelling‐wave‐based fault location without time synchronisation and wave velocity error

“…Therefore, to solve the problems aforementioned, a distributed travelling‐wave‐based fault‐location method which uses three measurement points at both ends and mid‐point of the transmission line is proposed in this paper. Existing three measurement points approaches are mostly utilised for multiple‐branching fault location in the three‐terminal transmission systems [16, 17], whose definition and structure are obviously different from the proposed method in this paper. Distributed fault‐location unit (DFDU) is an integrated device strung on the transmission line, powered by CT induction and super‐capacitor, to measure and transmit fault current data.…”