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電氣映像技法을 利用한 大地抵抗率과 接地抵抗 分析에 관한 硏究

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Alternative Title
A Study on the Analysis of Earth Resistivity and Grounding Resistance Using Electrical Image Technique
Abstract
The grounding system of the subsurface should ensure the safe and reliable operation of power systems, and guarantee a human being's safety in the situation of grounding fault in the power system. The safety of power apparatus in the subsurface can be reached by decreasing grounding resistance and grounding potential rise of subsurface. The optimal design of grounding systems for subsurface can ensure the equalization of the potential distribution of the ground surface above the grounding system, and can obviously improve the safety of the grounding system.
This thesis deals with the 2-dimensional reconstruction of the earth's resistivity distribution based on DC resistivity data. This task represents a nonlinear and ill-posed minimization problem with many degrees of freedom. In this work, techniques for regularization and controlling of this problem are described and classified. The system of equations as resulting from the application of the Gauss-Newton minimization can be solved efficiently. The characteristics of the four reconstruction algorithms such as Gauss-Newton, TSVD(truncated singular value decomposition), SIRT(simultaneous iterative reconstruction algorithm), and TLS(truncated least squares) algorithm are compared and analyzed.
Furthermore, a modified FEM scheme is used to test several widely-used resistivity arrays, namely Wenner, Schlumberger and dipole-dipole. The electrode arrangement of the arrays is described and the characteristics of above three array types are compared and analyzed.
The proposed methodology has been proposed according to which, after carrying out a set of soil resistivity measurements, one can compute the parameters of the multi-layer earth structure using a genetic algorithm(GA). The results provided by the GA constitute the indispensable data that can be used in circuital or field simulations of grounding systems. The methodology allows to proceed toward a very efficient simulation of the grounding system and an accurate calculation of potential on the ground surface.
Methods of error estimation, forward modeling and the calculation of the Jacobian matrix for DC resistivity data are developed. Procedures for appropriate parameterization and inversion control are pointed out by studies of synthetic models. Different inversion and regularization methods are examined in detail. A linearized study is used to compare different data sets considering their efficiency.
Finally the inversion methods are applied to field data. The described optimization strategies are realized in practice, which increases the economic relevance of two dimensional data acquisition. The structure of the subsurface is imaged in detail for several applications in the fields of cavity detection, archaeology and the investigation of ground falls. The resolution analysis is successfully established to appraise the obtained results.
Author(s)
부창진
Issued Date
2007
Awarded Date
2007. 2
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000003813
Alternative Author(s)
Boo, Chang-Jin
Affiliation
제주대학교 대학원
Department
대학원 전기전자공학과 전기공학전공
Advisor
김호찬
Table Of Contents
Ⅰ. 서론 = 1
Ⅱ. 대지저항률과 접지저항 = 6
1. 대지저항률과 대지파라미터 = 6
1) 대지저항률 변화요인 = 7
2) 겉보기대지저항률 = 9
3) 지층별 대지파라미터 해석 = 12
2. 대지저항률 측정방법 = 14
1) 기본 측정방법 = 14
2) Wenner 방법 = 16
3) Schlumberger 방법 = 17
4) Dipole-dipole 방법 = 17
3. 접지저항 = 19
1) 기본이론 = 19
2) 접지저항 측정방법 = 21
Ⅲ. 전기영상기법 = 24
1. 전기영상에서의 수학적 모델 설계 = 24
1) 측정 오차발생 요소 = 25
2) 전기영상기법의 수학적 모델 = 27
2. 전기영상 기법에 사용되는 전극배열 = 28
3. 전기영상복원기법 = 30
1) Gauss-Newton 방법 = 32
2) TSVD 방법 = 35
3) SIRT 방법 = 37
4) TLS 방법 = 38
4. 전기영상기법에서의 대지모델 = 39
1) 2층 구조 대지모델 = 39
2) 3층 구조 대지모델 = 40
3) 수직 구조 대지모델 = 41
5. 전기영상기법에서 다층구조의 대지파라미터 = 43
Ⅳ. 사례연구 = 51
1. 컴퓨터 시뮬레이션 = 51
1) 모델설계 = 51
2) 컴퓨터 시뮬레이션 결과 = 53
2. 실시간 접지저항 취득시스템 = 67
3. 현장 사례 결과 및 분석 = 73
1) 대지저항률 측정결과 = 73
2) 대지저항률 측정결과 분석 = 77
3) 실시간 접지저항측정 결과분석 = 95
4. 결과고찰 = 110
Ⅴ. 결론 = 112
참고 문헌 = 115
부록 = 119
부록 A. 클램프온 측정법을 이용한 접지저항 측정데이터 = 119
부록 B. TCP/IP 기반의 접지저항데이터 취득시스템 = 120
부록 C. Bluetooth를 이용한 접지저항 취득시스템 = 121
부록 D. SMS를 이용한 접지저항 취득시스템 = 122
감사의 글 = 124
Degree
Doctor
Publisher
제주대학교 대학원
Citation
부창진. (2007). 電氣映像技法을 利用한 大地抵抗率과 接地抵抗 分析에 관한 硏究
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Faculty of Applied Energy System > Electrical Engineering
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