1D-CNN based real-time fault detection system for power asset diagnostics

I. Mitiche*, A. Nesbitt, S. Conner, P. Boreham, G. Morison

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

Electromagnetic Interference (EMI) diagnostics aid in identifying insulation and mechanical faults arising in High Voltage
(HV) electrical power assets. EMI frequency scans are analysed to detect the frequencies associated with these faults. Timeresolved
signals at these key frequencies provide important information for fault type identification and trending. An end-to-end fault
classification approach based on real-world EMI time-resolved signals was developed which consists of two classification stages
each based on 1D-Convolutional Neural Networks (1D-CNN) trained using transfer learning techniques. The first stage filters the
in-distribution signals relevant to faults from out-of-distribution signals that may be collected during the EMI measurement. The fault
signals are then passed to the second stage for fault type classification. The proposed analysis exploits the raw measured timeresolved
signals directly into the 1D-CNN which eliminates the need for engineered feature extraction and reduces computation
time. These results are compared to previously proposed CNN-based classification of EMI data. The results demonstrate high
classification performance for a computationally efficient inference model. Furthermore, the inference model is implemented in
an industrial instrument for HV condition monitoring and its performance is successfully demonstrated in tested in both a HV
laboratory and an operational power generating site.
Original languageEnglish
Number of pages9
JournalIET Generation, Transmission & Distribution
Publication statusAccepted/In press - 17 Aug 2020

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