部分放電量測週期對地下電纜接頭瑕疵識別影響之研究

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研究生：	Bharath Kumar Boyanapalli Bharath Kumar Boyanapalli
論文名稱：	部分放電量測週期對地下電纜接頭瑕疵識別影響之研究 Study of Partial Discharges Measurement Cycle Effect on Defect Recognition for Underground Cable Joints
指導教授：	張建國 Chien-Kuo Chang
口試委員:	李俊耀 Chun-Yao Lee 張宏展 Hong-Chan Chang 郭政謙 Cheng-Chien Kuo 吳瑞南 Ruay-Nan Wu 張建國 Chien-Kuo Chang 黃維澤 Wei-Tzer Huang 陳鴻誠 Hung-Cheng Chen
學位類別：	博士 Doctor
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2023
畢業學年度：	111
語文別：	英文
論文頁數：	91
中文關鍵詞：	partial discharge measurement cycles 、feature extraction 、defect recognition 、convolutional neural networks
外文關鍵詞：	partial discharge measurement cycles, feature extraction, defect recognition, convolutional neural networks
相關次數：	點閱：218 下載：4
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In this study, the effects of different partial discharges (PDs)
measurement cycles on defect recognition of power cable joints are
presented. The measurement cycles of 40, 80, 120, 200, and1200 are
considered to analyze the recognition accuracy. PD measurement data
is collected by considering a total of 14 sets of power cable joints having
three types of pre-fabricated artificial defects. The popular Phase
Resolved Partial Discharges (PRPD) feature extraction procedure is
used to extract the PD features and the and observing the effects of the
considered measurement cycles on the n-q-ø pattern is used in the
recognition method while using the different measurement cycles with
a deep learning model, convolutional neural network (CNN) to evaluate
the training and testing accuracies of defect recognition for individual
cycles and compare the results. The results show that the performance
of 200 measurements cycles-based CNN model is sufficient to have the
effective PD defect recognition accuracy compared to other lesser
cycles. The total recognition accuracy obtained from a 200 cycles-based
CNN was 100%, whereas that of the other lesser cycles based-CNN was
about 96%. In addition, an important application of setting threshold
value to overcome the failure cases in defect recognition are discussed.

Abstract.................................................................................................I
Acknowledgement ..............................................................................II
Table of contents................................................................................III
List of figures...................................................................................... V
List of tables....................................................................................VIII
Chapter 1 Introduction...................................................................... 1
1.1 Research background and motivation ....................................... 1
1.2 Research purpose and objectives ............................................. 3
1.3 Significance of work and contribution..................................... 5
1.4 Thesis outline ........................................................................... 6
Chapter 2 Partial Discharge Measurement System and
Experimental Setup............................................................................. 7
2.1.Introduction of partial discharge .............................................. 7
2.1.1 Partial discharge definition .............................................. 8
2.1.2 Classification of partial discharge.................................... 9
2.1.2 Detection methods of partial discharge.......................... 12
2.2 High voltage cable introduction ............................................. 16
2.3 Production of experimental artificial defects......................... 20
2.4 PD experimental setup............................................................ 22
2.5 PD data collection from defect samples................................. 25
Chapter 3 Partial Discharge Data Acquisition and Analysis....... 27
3.1 Data preprocessing and noise suppression............................. 27
3.2 PD data reduction ................................................................... 28
3.3 Feature extraction ................................................................... 31
3.4 Phase resolve N-Q-Φ Pattern at different PD measurement
cycles....................................................................................... 33
Chapter 4 Defect Recognition using Convolutional Neural
Networks……….................................................................................38
4.1 Introduction of CNN ............................................................. 38
IV
4.2 Theory of CNN architecture.................................................. 40
4.3 Loss function......................................................................... 49
4.4 Optimial algorithm................................................................ 50
4.5 Confusion index .................................................................... 51
4.6 Establishment of CNN .......................................................... 52
4.6.1 Architeture of CNN.................................................... 55
4.7 modeling of CNN.................................................................. 57
Chapter 5 Results and Discussion of n-q-φ Pattern Recognition
. ............................................................................................................ 61
5.1 Training CNN with different measurement cycles................. 61
5.2 Testing CNN with different measurement cycles................... 65
5.3 Comparison of training and testing accuracies for different
measurement cycles .............................................................. 66
5.4 Comparison of testing accuracies for different measurement
cycles with CNN trained with 200 Cycles............................ 67
Chapter 6 Conclusion and Future Work ....................................... 69
References .......................................................................................... 70
                                

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