NDLI: Optimum acoustic sensor placement for partial discharge allocation in transformers

Content Provider	IET Digital Library
Author	Hekmati, Arsalan Hekmati, Rasoul
Abstract	Partial discharges (PDs) are a cause of degradation of insulation system and its permanent activity monitoring is used as a tool for insulation condition assessment in power transformers. Information on PD position can be used by plant monitors to diagnose the cause of PD and can help to identify type and severity of an insulation fault for maintenance strategies. The acoustic PD detection system, with great advantages relative to other methods, contains inaccuracies in PD localisation, such as the multipath interferences due to reflections within transformer tank, improper acoustic coupling between sensor and tank surface, mechanical vibrations and inherent sensor inaccuracies, which can severely limit the accuracy of the positioning system and make locating the exact positions of PD difficult. In this study, a method has been proposed for calculation of position measurement sensitivity for different PD origins within transformer tank. Different possible cases have been considered for placement of acoustic emission (AE) sensors. For each case, sensitivity of PD location to the time measurement errors has been calculated. The optimum arrangement of AE sensors has been chosen as the configuration yielding lowest error in the PD localisation. A test setup has been organised and the experimental results have justified the theoretical analysis.
Starting Page	581
Ending Page	589
Page Count	9
ISSN	17518822
Volume Number	11
e-ISSN	17518830
Issue Number	Issue 5, Aug (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/11/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2016.0417
Journal	IET Science, Measurement & Technology
Publisher Date	2017-03-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Acoustic Emission Acoustic Emission Sensor Acoustic PD Detection System Acoustic Transducers Acoustic Variables Measurement AE Sensor Charge Measurement Dielectric Breakdown And Discharges Fault Diagnosis Insulation And Insulating Coatings Insulation Condition Assessment Maintenance Engineering Maintenance Strategy Measurement Error Mechanical Vibration Multipath Interference Optimum Acoustic Sensor Placement Partial Discharge Allocation Partial Discharge Measurement PD Allocation PD Localisation Position Measurement Positioning System Power Transformer Insulation Power Transformer Tank Sensing Device And Transducers Sensor Sonic And Ultrasonic Transducers Spatial Variables Measurement Time Measurement Time Measurement Error Transformer And Reactors
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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