Page 249 - 捷運技術 第35期
P. 249
捷運技術半年刊 第 35 期 95 年 8 月 241
臺北捷運電力電纜線對通訊線間電磁干擾
之探討
2
1
李建興 張達人
摘 要
本文探討台北捷運供電系統所產生的電磁強度，是否會干擾到通訊系統的正常工作。在
隧道中的通訊系統是由洩波同軸電纜傳輸，而干擾源則是由供電系統裡的電力電纜線所產
生，而電磁干擾會在洩波同軸電纜上感應出一感應電壓，吾人利用公式計算出其縱向感應電
壓，再分析電力電纜線與通訊線之間的距離大小和改變電力電纜線排列型式，是否會改變縱
向感應電壓大小，最後參考比較相關規定，是否達到標準值以下。
關鍵字：電磁強度、洩波同軸電纜、感應電壓、導線排列。
Investigation of Electromagnetic Interferences
between Power Cables and Communication Lines
in Taipei Mass Rail Transit
Chien-Hsing Lee Ta-Jen Chang
Abstract
This paper investigates whether the electromagnetic field intensity between power supply
systems and communication systems in Taipei rail transit systems will interfere the normal
operation of communication. Since the leaky coaxial cable is normally used for communication
transmission in tunnels, the power cable used in power supply systems will interfere
communication systems and generate an induced voltage. The vertically induced voltage can be
computed and numerically analyze whether the distance between two systems and the arrangement
of cables will affect the induced voltage or not. Additionally, the induced voltage will compare with
other criteria.
Key Word：Electromagnetic field intensity, Leaky coaxial cable, Induced voltage, Arrangement of
cables。
1. 國立成功大學系統系副教授 chienlee@mail.ncku.edu.tw
2. 國立雲林科技大學電機系碩士生 g9212728@yuntech.edu.tw
