MEASUREMENT OF RAIL BOND IMPEDANCE
Many underground mines use electric rail haulage incorporating the track as the return conductor. This approach makes it essential that the rail joints have as little resistance as possible in order to properly carry the return current. Resistance is significantly reduced by bonding the joints, and is required by Federal law. Bonds can become broken or dislodged for many reasons, however. These open bonds can cause significant voltage drop in the rail at the unbonded joint. This drop can result in power loss, and can sometimes seriously affect the operation of ground-check monitors and ground-fault relays. Because most bonds are buried beneath several inches of coal, gravel, rock dust or mud, it becomes very costly for the mine operator to have these bonds checked frequently. West Virginia University has undertaken the task of developing instrumentation which will quickly and accurately assess the impedance of each bond. This paper contains an analysis of the severity of the problem, a description of the instrumentation developed to measure bond electrical characteristics, and the results of some preliminary measurements made underground.
- Proceedings of the West Virginia University (WVU) Conference on Coal Mine Electrotechnology, 4th, Morgantown, West Virginia, August 2-4, 1978; Paper 6.
Institute of Electrical and Electronics Engineers3 Park Avenue, 17th Floor
New York, NY USA 10016-5997
- DeLong, C P
- Cooley, W L
- Publication Date: 1978
- Pagination: 8 p.
- TRT Terms: Bonding; Electrical impedance; Inspection; Instrumentation; Joints (Engineering); Mechanical impedance; Mine haulage; Rail (Railroads); Railroad electrification
- Old TRIS Terms: Bonded joints; Rail bonding
- Subject Areas: Design; Railroads;
- Accession Number: 00195709
- Record Type: Publication
- Source Agency: Engineering Index
- Report/Paper Numbers: IEEE n78CH1386-2 IA Conf Paper
- Files: TRIS
- Created Date: Jul 11 1979 12:00AM