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IET Signal Processing

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Micro & Nano Letters

The Journal of Engineering

Field verification of a novel and simple partial discharge detection method for generator applications

Content Provider	IET Digital Library
Author	Herath, Thathsara Kumara, Sarath Bandara, Kapila Wijayakulasooriya, Janaka Fernando, Manjula Jayanatha, Gawasinghe A.
Abstract	This study introduces a simple and novel partial discharge (PD) detection method for generator condition monitoring applications. The proposed method uses statistical operator ‘Variance’ which is proportional to the power of an electrical signal. It was validated by field measurement conducted at four in service hydro-generators: two having heavily aged windings and the other two having identical new. First, accuracy of detecting PD pulses was verified by comparing with wavelet-based method. The proposed method detected all the PD pulses with a ‘Precision’ higher than 90% and recall of 100%. As the second step phase resolved PD (PRPD) patterns generated using the proposed method were compared with commercial PD monitoring systems. It was found that the overall similarity was above 0.75. Finally, extracted PD pulses were used to calculate the polarity wise dissipated PD energies. The calculated energies were correlated with identified PD sources through series of off-line tests and visual inspections. It was observed that discharges due to loosen windings and corona activity were well correlated with estimated PD energies. All these validation processes indicated that the proposed method effectively and accurately detect PD pulses and can be used as a diagnostic tool for generator applications.
Starting Page	835
Ending Page	843
Page Count	9
ISSN	17518822
Volume Number	14
e-ISSN	17518830
Issue Number	Issue 7, Sep (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/14/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2018.5631
Journal	IET Science, Measurement & Technology
Publisher Date	2020-06-03
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	A.C. Machine Calculated Polarity-based Energies Charge Measurement Commercial PD Monitoring System Condition Monitoring Corona Detecting PD Pulses Dielectric Breakdown And Discharges Estimated PD Energy Extracted PD Pulses Field Measurement Field Verification Generator Application Generator Condition Monitoring Application Heavily Aged Windings Hydroelectric Generator Hydroelectric Power Stations And Plant Identified PD Source Insulation Testing Machine Insulation Partial Discharge Measurement PD Noise Rejection PD Pattern Polarity Wise Dissipated PD Energy PRPD Pattern Service Hydro-Generator Simple Partial Discharge Detection Method Statistical Operator Variance Wavelet Transform Wavelet-based Method
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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