Development of numerical model for estimating thermal environment of underground power conduit considering characteristics of backfill materials

The thermal analysis of an underground power conduit for electrical cables is essential to determine their current capacity with an increasing number of demands for highvoltage underground cables. The temperature rises around a buried cable, caused by excessive heat dissipation, may increase considerably the thermal resistance of the cables, leading to the danger of “thermal runaway” or damaging to insulators. It is a key design factor to develop the mechanism on thermal behavior of backfilling materials for underground power conduits. With a full-scale field test, a numerical model was developed to estimate the temperature change as well as the thermal resistance existing between an underground power conduit and backfill materials. In comparison with the field test, the numerical model for analyzing thermal behavior depending on density, moisture content and soil constituents is verified by the one-year-long field measurement.

keywords: Underground power conduit, Electrical cables, Thermal runaway, Thermal resistance, Backfill materials., 지중전력구, 전력케이블, 열폭주, 열저항, 되메움재

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Vol.19 No.2

되메움재 특성을 고려한 전력구 열환경변화 예측 수치해석모델 개발

Development of numerical model for estimating thermal environment of underground power conduit considering characteristics of backfill materials

Abstract

참고문헌

(사)한국터널지하공간학회