LIGHTNING AND ITS EFFECTS ON RAILROAD SIGNAL CIRCUITS
This study discusses the occurrence of lightning, its effects on railroad signal equipment, and protection of such equipment from lightning damage, with special attention to known protective techniques which are employed in a variety of situations in the power, communications, and railroad industries. A brief review is offered of the causes of lightning and other surges, followed by an extensive treatment of the means by which lightning and power-line transients induce surges and over-voltages in signalling circuits. Specific topics include the effects of the direct stroke current, the collapsing electric field when the stroke occurs, inductive coupling, and the effects of ground currents in the earth. A survey of protective devices and techniques currently in use for specific types of equipment is presented, including categorization of arrestors by type and application. Preferred lightning protection practices in railroad signalling are examined and related to practices in other fields. The problem of lightning protection is addressed from an overall systems viewpoint, encompassing development and testing of protective systems and design of systems, so that they can more easily be protected. Recommendations for future research are made.
- Record URL:
- Lowell Technological Institute is under contract to Transportation Systems Center.
Lowell Technological Institute Research Foundation450 Aiken Street
Lowell, MA United States 01854
- Holmstrom, F Ross
- Publication Date: 1975-12
- Features: Figures;
- Pagination: 106 p.
- TRT Terms: Interference; Reliability; Signal devices; Track circuits; Traffic signal control systems
- Old TRIS Terms: Ground currents; Lightning arrestors; Signal systems
- Subject Areas: Operations and Traffic Management; Railroads;
- Accession Number: 00131042
- Record Type: Publication
- Source Agency: Federal Railroad Administration
- Report/Paper Numbers: FRA-OR&D-76-129 Final Rpt.
- Contract Numbers: DOT-TSC-589
- Files: TRIS, USDOT
- Created Date: Apr 21 1976 12:00AM