General earth fault protection for MV networks using wavelet decomposition and Bayesian criterion

For selective detection of earth faults in medium voltage networks, the general protection can be used, which unlike individual protections controls earth currents in all lines supplied from the substation. To detect high-resistance and arc faults, it is possible to use in such protections the detai...

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Bibliographic Details
Main Author: Marciniak, Lubomir
Format: Conference Proceeding
Language:English
Subjects:
Bayesian analysis
Circuit protection
Conditional probability
Criteria
Decomposition
Earth faults
Electrical transmission
Fault detection
Harmonic distortion
Mathematical models
Parameters
Probability density functions
Short circuits
Substations
Wavelet analysis
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Summary:For selective detection of earth faults in medium voltage networks, the general protection can be used, which unlike individual protections controls earth currents in all lines supplied from the substation. To detect high-resistance and arc faults, it is possible to use in such protections the details from wavelet decomposition of earth currents and the Bayesian conditional probability criterion. The paper presents a protection model using details of earth currents and the Bayesian criterion. Significant parameters of the model were determined: sampling frequency, wavelet types and decomposition levels, parameters of the probability density function and decision conditions. The effectiveness of the protection in the case of non-stationary high-resistance short-circuits in the network with natural asymmetry and harmonic distortion was also assessed.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/20198402007