직선형 접지전극의 임계길이의 산정

국문 초록 (Abstract)

뇌전류와 같이 고주파성분을 함유한 서지전류나 전자통신기기의 전자기장해를 유발하는 고주파 이상전류에 대하여 접지전극은 주파수에 의존적인 상당히 복합적인 임피던스의 특성을 보인다. 접지전극의 접지임피던스는 접지전극의 크기를 증가시켜도 낮아지지 않고, 대지의 특성과 주파수 조건에 따라 접지임피던스가 최소값을 보이는 접지전극의 길이가 존재하며, 이 접지전극의 길이를 대지의 특성과 주파수 조건에 대한 임계길이라 정의한다. 본 논문에서는 분포정수회로모델을 이용하여 수직접지전극과 수평접지전극의 임계길이를 산정하였으며, 실험결과와의 비교를 통해 타당성을 확인하였다.

다국어 초록 (Multilingual Abstract)

For the surge currents like lightning currents containing high frequency components and the abnormal currents having high frequencies which cause the EMI(Electromagnetic interference) problems for the electronic devices and communication instruments, the linear grounding electrodes have the significantly composite impedance characteristics which are dependent on the frequency of the applied current. The impedance of a grounding electrode is not lowered by expanding the dimension of the grounding electrode, and the length of grounding electrode having the minimum value of the grounding impedance for each condition of frequency and soil characteristics is existent, and it is defined as Critical length. In this paper, the critical lengths for the vertically and horizontally-buried grounding electrodes are calculated by using the distributed parameter circuit model. The propriety of the simulations has been confirmed by comparing the simulated results with the measured results.

목차 (Table of Contents)

• 요약
• Abstract
• 1. 서론
• 2. 접지전극의 임계길이의 산정방법
• 3. 결과 및 검토
• 4. 결론
• References
• 저자소개

참고문헌 (Reference)

1 이복희, "접지의 핵심 기초 기술" 의제 1-3, 2007

2 이복희, "전력시스템공학" 인하대학교 출판부 137-143, 2007

3 M. I. Lorentzou, "Transmission line modeling of grounding electrodes and calculation of their effective length under impulse excitation" 2005

4 M. I. Lorentzou, "Time domain analysis of grounding electrodes impulse response" 18 (18): 517-524, 2003

5 Leonid Grcev, "Lightning Surge Characteristics of Earthing Electrodes" 5a-1-1-5a-1-16, 2008

6 한국표준협회, "KS C IEC 62305-1: 2007, 피뢰시스템-제3부: 구조물의 물리적 손상 및 인명위험"

7 Leonid Grcev, "Improved design of power transmission line grounding arrangements for better protection against effects of lightning" 100-103, 1998

8 IEEE Inc., "IEEE Std 81.2-1991, IEEE Guide for Mdeasurement of Impedance and Safety Characteristics of Large, Extended or Interconnected Grounding Systems"

9 Leonid Grcev, "High-frequency performance of ground rods in highly resistive soil" 85-89, 2000

10 M. E. Almeida, "Fundamental considerations on long ground electrodes design" 241-244, 2003

11 William H. Hayt, "Enginnering Electromagnetics, sixth edition" McGraw-Hill 225-231, 2001

12 S. Bourg, "Deep earth electrodes in highly resistive ground : frequency behaviour" 584-588, 1995

13 Blas Hermoso, "Counterpoise impedance with lightning discharges. Critical, effective, minimal impedance lengths. Technical considerations" 676-679, 2006

14 Silverio Visacro, "A comprehensive approach to the grounding response to lightning curr" 22 (22): 381-386, 2007