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Suggested Citation:"Chapter 1 - Introduction." National Academies of Sciences, Engineering, and Medicine. 2020. Guidebook for Detecting and Mitigating Low-Level DC Leakage and Fault Currents in Transit Systems. Washington, DC: The National Academies Press. doi: 10.17226/25743.
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Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

1 Methods for detecting DC leakage and fault currents in transit systems are categorized as (1) nonintrusive injection-based measurement techniques and (2) radio frequency (RF) emission- based detection techniques. However, no prior sensor exists that can detect low-level leakage currents in DC transit systems. This guidebook focuses on the methods the research team used during the course of TCRP Project D-17 to develop sensors to be used in these techniques and test them in the field. This guidebook provides specifications for these sensors and outlines their capabilities and appropriate operating conditions. The frequency, voltage, and current limitations are specified for the injection-based sensors. The data processing and linkage to failures along with the frequency of operation are provided for the RF emission-based sensors. C H A P T E R 1 Introduction

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Improving the reliability of railway electric systems and preventing electrical outages due to insulator flashover and insulation failure are difficult because of aging infrastructure and the lack of continuous monitoring of the state of the systems.

The TRB Transit Cooperative Research Program's TCRP Research Report 211: Guidebook for Detecting and Mitigating Low-Level DC Leakage and Fault Currents in Transit Systems provides specifications for sensors being tested in the field and outlines their capabilities and appropriate operating conditions.

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