NDLI: De-noising of time-domain spectroscopy data for reliable assessment of power transformer insulation

Content Provider	IET Digital Library
Author	Mishra, Deepak Baral, Arijit Chakravorti, Sivaji
Abstract	Polarisation–depolarisation current (PDC) measurement and its analysis is a popular technique for assessing the condition of transformer insulation. Owing to the low magnitude of PDC, recording noise-free PDC data from in-situ power transformers is a challenge. Once the relaxation current data get affected by noise, it becomes difficult to formulate insulation model (as recorded data loses its characteristic shape). This further makes the data difficult to analyse and predict insulation condition. In this study, two de-noising techniques are discussed (one is based on Wavelet Transform while the other is based on Stockwell Transform) for eliminating low-frequency non-stationary noise from recorded PDC data. Comparison between these two techniques suggests de-noising using Stockwell Transform is advantageous over wavelet analysis. The proposed methodology is first tested on data recorded from the sample prepared in the laboratory and then on data measured from real-life in-service power transformer.
Starting Page	1500
Ending Page	1507
Page Count	8
ISSN	17518687
Volume Number	14
e-ISSN	17518695
Issue Number	Issue 8, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/14/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2019.0974
Journal	IET Generation, Transmission & Distribution
Publisher Date	2020-01-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Characteristic Shape Current Measurement De-noising Technique Dielectric Measurement Electric Current Measurement In-service Power Transformer In-situ Power Transformer Insulation Condition Insulation Model Insulation Testing Low-frequency Nonstationary Noise Mathematical Analysis Noise-free PDC Data Organic Insulation Polarisation Polarisation–depolarisation Current Measurement Power Transformer Power Transformer Insulation Recorded PDC Data Relaxation Current Data Reliable Assessment Stockwell Transform Time-domain Spectroscopy Data Transformer And Reactors Transformer Oil Wavelet Analysis Wavelet Transform
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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