DOI QR코드

DOI QR Code

Investigation of Coring Grounding Construction by Equivalent Radius Concept

등가반경개념에 의한 코어링 접지공사의 고찰

  • Published : 2003.09.01

Abstract

The grounding system is necessary to provide means to dissipate electric currents into the earth without exceeding any operating and equipment limits. The ground is composed of various soils and the resistivity of the soil depends on many parameters. It depends on the type of soil and varies with distance as well as with depth. Especially, soil resistivity of volcanic area such as Jeju is ve교 high and it is difficult to acquire necessary grounding resistivity. This paper introduces the efficient grounding construction using coring technique for proper grounding resistance in high resistivity area. Because it is difficult to measure the accurate resistivity of soils, their resistivities are estimated using measured value of ground resistance and equivalent radius method. Estimated resistivities are used for grounding resistance in scheduled construction region.

대지 저항률이 높은 암반, 사력층 지역에서의 접지 저항은 일반적인 봉형 접지 전극으로는 얻기가 거의 불가능 하며 원하는 저항값을 얻기 위해서는 깊이 매설한 접지 전극과 접지 저항 저감제를 충분하게 사용하는 코어링 접지 방식을 채택하여 시설하는 것이 적절하다고 판단된다. 본 연구는 둥가반경 개념을 이용하여 코어링 접지 전극의 반 경이 확장되는 것을 보였으며 이릎 토대로 낮은 접지 저항이 얻어지고, 제주지역과 같이 고저항 지대에서의 각 토 양의 대지 저항률을 추정함으로써 다른 고저항 지대에서의 접지공사시 개략적인 접지저항을 예측하여 기초 자료로 사용할 수 있도록 하였다.

Keywords

References

  1. Jeju 22.9kV-y Voltage Rise Design & Construction Method, KEPCO Jeju District, 1991. 9.
  2. Lee Jong-Sun, Grounding Technics and Grounding System, Sungan-dang, 1993.
  3. Monthly Electricity, Grounding Resistance, 1994. 3.
  4. ANSI, IEEE Guide for Safety in AC Substation Grounding. ANSI/IEEE Std 80-1986.
  5. Lee Bok-Hee, Lee Sung-Chul, The Major Foundational Technics for Grounding Systems, Uijae, 2000.
  6. Monthly Electricity, Ground Resistance Reduction, 1994. 9.
  7. Jeju Water Source Management Office, Juju Geological Materials, 2001.