台北捷運北投機廠邊界轉換軌電蝕分析

The Corrosion Analysis of Transfer Track in Depot Peitou Boundary of the Taipei Rapid Transit System

10.6358/JCYU.200503.0095

何金滿(J. M. Ho)；周皇佑(H. Y. Chou)

接地系統 ； 軌道對地電阻 ； 軌道對地電阻 ； grounding system ； track-to-ground potential ； track-to-ground resistance

中原學報

33卷1期（2005 / 03 / 01）

95 - 102

繁體中文

捷運系統爲防治雜散電流之傷害，而於捷運各機廠與主線軌道間施以電氣隔離，然在不同接地系統間因該電流所産生之電位差正是造成軌道電蝕之最大成因，當電車鋼輪跨越兩個不同接地系統間，瞬間將兩邊電位差短接成同一電位，並産生一電弧導致軌道電蝕，故軌道對地電位變化及電車之負回流與軌道電蝕有密切關聯性。 針對捷運機廠邊界軌道電蝕的防治及改善對策，本文有以下三點建議：(1)避開機廠駐車區鋼軌直接接地時收發車、(2)避開主線軌道對地電位突異時收發車、(3)提高機廠軌道的對地洩漏電阻。

In order to prevent the damages of stray currents, the mass rapid transit (MRT) system has electrical insulation between the MRT depot and the main line tracks, however, the potential difference of different grounding systems is the most important factor of electrical corrosion on tracks. When steel wheels of train stride over two different grounding systems, they momently short the different potentials, and produce an electrical arc that causes track corrosion. Therefore track corrosion is closely related to the track-to-ground potential and the return current of train. For reducing corrosion on insulating rail joint (IRJ) in depot boundary of the mass rapid transit system, this study makes the following three suggestions: (1) Don't receive and/or dispatch train when the rails of depot area are in solid ground situation. (2)Don't receive and/or dispatch train when the track-to-ground potential of main line is too high. (3)Increase track-to-ground resistance in depot area.