NDLI: Statistical correlation technique for transient signal analysis during impulse testing of transformers

Content Provider	IET Digital Library
Author	Garg, Ankita Sharma, Tapan Jain, Apurti Velandy, Jeyabalan
Abstract	The reliable technique for identification of winding insulation faults in a transformer is necessary for a testing engineer during impulse test. In this study, a statistical correlation technique is proposed to estimate the ‘best correlation’ between transient signals for passed (withstood the impulse voltage) or failed (not withstood) conditions of the insulations. In this study, normalised reduced impulse voltage is considered initially as a reference signal. The next successive impulse test sequences due to rated test voltage are correlated as a test signal with a reference signal using a proposed technique. It makes a ‘good correlation value along with its directions’ between the reference signal and test signal based on measured the applied impulse voltage waveshape and its winding response. The fundamentals of the correlation coefficient, curve fitting techniques, conditional variance, normalisation and time delay index are integrated effectively to predict the characteristics (degree/magnitude and direction) of correlation between the signals. 2.5-MVA 11/0.433 kV (distribution transformer), 0.3-MVA 34.5/0.415 kV (earthing transformer) and 250-MVA 500/275/33 kV (power transformer) are effectively utilised to validate proposed technique. The advantage of the proposed technique is validated with partial discharge detection in windings due to an impulse voltage application using an 11 kV single-layer winding.
Starting Page	857
Ending Page	863
Page Count	7
ISSN	17518822
Volume Number	14
e-ISSN	17518830
Issue Number	Issue 8, Oct (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/14/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2019.0289
Journal	IET Science, Measurement & Technology
Publisher Date	2020-03-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Conditional Variance Connector Curve Fitting Curve Fitting Technique Electricity Supply Industry Factory Witness Test Impulse Testing Impulse Voltage Wavehape Insulation Testing Insulator Interpolation And Function Approximation Lightning Lightning Impulse Test Machine Testing Numerical Analysis Partial Discharge Detection Power Line Supports Power System Economics Power System Fault Power System Managemen Power System Operation Power Transformer Insulation Power Transformer Testing Reliability Reliable Technique Statistical Analysis Statistical Correlation Technique Statistics System Fault Testing Engineer Time Delay Index Transformer And Reactors Transformer Winding Insulations Transformer Windings Transient Signal Analysis Voltage 0.415 KV Voltage 0.433 KV Voltage 11.0 KV Voltage 275.0 KV Voltage 33.0 KV Voltage 34.5 KV Voltage 500 KV
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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