Earthing and bonding on railways: the black arts of induction
Much valuable equipment is lost due to voltages induced from power lines and electric traction systems. In the worst case human life can also be put at risk when high potentials occur between adjacent items of equipment. Signalling equipment could malfunction or adopt erroneous and hazardous logic conditions if overall system design does not consider these external influences. The calculation of induced voltages and the design of earthing and bonding systems is well documented but frequently applied inappropriately as the origin of some of the practices and criteria often seems to have been lost in the mists of time, frequently subject to subjective philosophical decisions and much faith is often placed in highly accurate modelling derived from input data of dubious accuracy. This paper aims to demystify some aspects of this cross-disciplinary subject, reviewing past historical practices adopted by different rail authorities. Methods are given of estimating key design parameters such as induced voltages and equipment and personnel hazards resulting from induction and earth potential rise and installation pitfalls to be avoided by a top down approach to earthing and bonding.
- Record URL:
- Blakeley-Smith A
- Publication Date: 2004
- Pagination: 9p.
- Monograph Title: New horizons for rail: CORE 2004: conference on railway engineering, June 20-23 2004, Darwin, Northern Territory, Australia
- TRT Terms: Accuracy; Electricity; Railroad transportation; Traffic signal controllers
- ATRI Terms: Accuracy; Electricity; Rail transport; Signal controller
- Subject Areas: Operations and Traffic Management; Railroads;
- Accession Number: 01517207
- Record Type: Publication
- Source Agency: ARRB
- Files: ATRI
- Created Date: Mar 4 2014 8:13PM