매설지선의 길이와 전류인가점에 따른 접지임피던스특성

국문 초록 (Abstract)

본 논문은 임펄스전류가 인가된 매설지선의 과도접지임피던스특성에 관한 것으로 길이가 10, 30, 50 [m]인 3개의 매설지선에 대하여 임펄스전류의 인가점을 파라미터로 하여 과도접지임피던스와 규약접지임피던스를 측정하고 분석하였다. 임펄스전류의 상승시간에 대한 규약접지임피던스는 과도접지임피던스와 비슷한 경향이었다. 과도접지임피던스는 임펄스전류의 인가위치에 영향을 크게 받으며, 짧은 시간영역에서 과도접지임피던스는 매설지선의 길이에 매우 의존적이다. 임펄스전류가 인가된 10 [m]의 매설지선은 용량성 특성이었으나 30 [m]와 50 [m]의 매설지선은 유도성 특성을 나타내었다. 접지도선은 매설지선의 중앙점에 접속하는 것이 바람직한 것으로 밝혀졌다.

다국어 초록 (Multilingual Abstract)

This paper presents the grounding impedance behaviors of counterpoise exposed to impulse currents. The transient and conventional grounding impedances of three counterpoises having the length of 10, 30 and 50 [m] were measured and analyzed as a function of the injection point of impulse currents. As a result, the trend of the conventional grounding impedances measured as a function of risetime of impulse current is similar to the transient grounding impedance of counterpoise. The injection point of impulse current has great influence on the transient grounding impedance characteristics of counterpoise. The transient grounding impedance characteristics in a short time range are strongly dependent on the length of counterpoise. The transient characteristics of grounding impedance of 10 [m] counterpoise subjected to the impulse current was capacitive behavior, on the other hand, those of 30 [m] and 50 [m] counterpoises were inductive behavior. It is found that the grounding conductor should be connected to the central point of counterpoise.

목차 (Table of Contents)

• 요약
• Abstract
• 1. 서론
• 2. 실험계의 구성 및 방법
• 3. 결과 및 고찰
• 4. 결론
• References
• 저자소개

참고문헌 (Reference)

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2 L Grcev, "Modeling of grounding systems for better protection of communication installations against effects from electric power system and lightning" (484) : 461-468, 2001

3 "KS C IEC 62305-1, 피뢰시스템-제1부: 일반원칙"

4 B. R. Gupta, "Impulse impedance of grounding grids" PAS-99 (PAS-99): 214-218, 1980

5 Leonid Grcev, "Improved design of power transmission line grounding arrangements for better protection against effects of lightning" C1-7 : 100-103, 1998

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

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

8 S. Visacro, "A didactic general approach of grounding behavior for lightning currents" 1 : 508-513, 2004