Page 99 - 捷運技術 第53期

捷運線營運後負電軌對地電阻量測方法研究

Assessment of Negative Rail-to-ground Resistance

for Transit Lines During Revenue Service

Henry Yen *
Electrical and Mechanical Design Division, Department of Rapid
Transit Systems, Taipei City Government
No. 7, Ln. 48, Sec. 2, Zhongshan N. Rd., Zhongshan Dist., Taipei
City 10448, Taiwan (R.O.C.)
Bih-Yuan Ku
Department of Electrical Engineering
National Taipei University of Technology

(Date received：1 June 2018 ; accepted：20 August 2018)
Abstract

This paper presents a novel approach to measure rail-to-ground resistance
for the negative rails of transit lines after revenue service. Using the Wen-
Hu Line(Brown Line) as the study case. It is observed that no appropriate
approach is available from technical literatures or international standards to
suit the circuit configuration of continuous negative rail and earthed condition
when revenue service stop. The proposed method uses synchronous negative
rail potential measurements generated by train traction currents to obtain
data for rail-to-ground resistance calculation, which can achieve substantial
negative rail potential values and hence numerical data of good quality. Field
data from the Brown Line show that the proposed method can be used to
routinely examine rail-to-ground resistances for transit line in revenue service.
Keywords: Rail systems, stray current, traction power systems

* Corresponding author : 11038@dorts.gov.taipei

093