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This paper highlights the earth fault problem in unearthed (isolated) and compensated neutral medium voltage distribution networks and the transient-based protection as a solution. The technique of transient-based analysis will be discussed considering the sampling window, frequency and data updating. The required transient simulation analysis and its validation will be presented. Many important practical...
In a Bayesian selectivity technique has been introduced to identify the faulty feeder in compensated medium voltage (MV) networks. The proposed technique has been based on a conditional probabilistic method applied on transient features extracted from the residual currents only using the Discrete Wavelet Transform (DWT). In this paper, the performance of this selectivity technique is evaluated when...
In this paper, a Bayesian selectivity technique is introduced to identify the faulty feeder in compensated medium voltage (MV) networks. The proposed technique is based on a conditional probabilistic method applied on features extracted from the residual currents only using the discrete wavelet transform (DWT). DWT enhances to localize initial transients generated in the network due to the fault event...
In this paper, the windowed standard deviation (WSTD) is used to extract the initial transients created in residual current waveforms generated due to earth faults in medium voltage (MV) compensated networks. The sliding window width used for computing the standard deviation is evaluated from the frequency filter point of view. The fault cases occurring in a compensated 20 kV network are simulated...
This paper presents a new centralized selectivity algorithm for earth-faults in isolated and compensated neutral medium voltage (MV) networks. The algorithm proposes to investigate and utilize the relation between the transient phase current changes in the substation transformer and the transient residual currents for each feeder and section of the network. The transient RMS values of the residual...
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