Partial Discharge Location Technique for Covered-Conductor Overhead Distribution Lines

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Isa, Muzamir 2013-01-09T09:30:15Z 2013-01-09T09:30:15Z 2013
dc.identifier.isbn 978-952-60-4972-4 (electronic)
dc.identifier.isbn 978-952-60-4971-7 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.abstract In Finland, covered-conductor (CC) overhead lines are commonly used in medium voltage (MV) networks because the loads are widely distributed in the forested terrain. Such parts of the network are exposed to leaning trees which produce partial discharges (PDs) in CC lines. This thesis presents a technique to locate the PD source on CC overhead distribution line networks. The algorithm is developed and tested using a simulated study and experimental measurements. The Electromagnetic Transient Program-Alternative Transient Program (EMTP-ATP) is used to simulate and analyze a three-phase PD monitoring system, while MATLAB is used for post-processing of the high frequency signals which were measured. A Rogowski coil is used as the measuring sensor. A multi-end correlation-based technique for PD location is implemented using the theory of maximum correlation factor in order to find the time difference of arrival (TDOA) between signal arrivals at three synchronized measuring points. The three stages of signal analysis used are: 1) denoising  by applying discrete wavelet transform (DWT); 2) extracting the PD features using the absolute or windowed standard deviation (STD) and; 3) locating the PD point. The advantage of this technique is the ability to locate the PD source without the need to know the first arrival time and the propagation velocity of the signals. In addition, the faulty section of the CC line between three measuring points can also be identified based on the degrees of correlation. An experimental analysis is performed to evaluate the PD measurement system performance for PD location on CC overhead lines. The measuring set-up is arranged in a high voltage (HV) laboratory. A multi-end measuring method is chosen as a technique to locate the PD source point on the line. A power transformer 110/20 kV was used to energize the AC voltage up to 11.5 kV/phase (20 kV system). The tests were designed to cover different conditions such as offline and online measurements. The thesis evaluates the possibility of using a Rogowski coil for locating faults in MV distribution lines and a test bench of a 20 kV distribution network is developed. Different fault scenarios are simulated including earth and phase faults, arcing faults and faults caused by leaning trees. Results favourably show the possibility of using a Rogowski coil for locating faults in distribution networks.    en
dc.format.extent 133
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 9/2013
dc.subject.other Electrical engineering en
dc.title Partial Discharge Location Technique for Covered-Conductor Overhead Distribution Lines en
dc.type G4 Monografiaväitöskirja fi Sähkötekniikan korkeakoulu fi School of Electrical Engineering en
dc.contributor.department Sähkötekniikan laitos fi
dc.contributor.department Department of Electrical Engineering en
dc.subject.keyword correlation en
dc.subject.keyword wavelet transforms en
dc.subject.keyword partial discharge en
dc.subject.keyword Rogowski coil en
dc.subject.keyword EMTP-ATP en
dc.subject.keyword overhead covered-conductor en
dc.subject.keyword distribution systems en
dc.identifier.urn URN:ISBN:978-952-60-4972-4
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (monograph) en
dc.type.ontasot Väitöskirja (monografia) fi
dc.contributor.supervisor Lehtonen, Matti, Prof., Aalto University, Finland
dc.opn Ametani, Akihiro, Prof., Doshisha University, Kyoto, Japan
dc.contributor.lab Power Systems and High Voltage Engineering en
dc.rev Wetzer, Joseph, M., Dr., Principal Consultant Asset Management, KEMA Nederland B.V., The Netherlands
dc.rev Kim, Charles J., Associate Prof., Howard University, Washington, USA 2013-01-11

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