Surge Protection Standards for Electronic Equipment in Railway Systems
Rail applications demand that equipment is able to withstand the harsh climatic, mechanical and electrical environments encountered on traction vehicles and rolling stock. Electronic equipment, from lighting through passenger information and entertainment, to control, safety & engine management systems require DC/DC power conversion and must perform safely and reliably. The supply requirements that apply to DC/DC converters will be discussed here include burst, supply variation, interruptions, surges, electrostatic discharge, and transient.
There are many popular standards that pertain to electronic equipment on rolling stock. Major work has been done to harmonize railway standards in Europe. The introduction of European Norm EN’s is being adopted slowly by railways electronics manufacturers and include EN 50155 Railways Applications Electronic Equipment Used on Rolling Stock, EN 50125 Railway Applications; Environmental Conditions for rolling stock, and EN50163 Supply voltages of traction system. EN 50155 is the most frequently cited design specification. Attention is drawn to the surge and transients specified in BS EN 50121-3-1:2015 and RIA12 standards as these specifications are more aggressive and challenging than industrial standards and often where commercial off-the-shelf equipment can fail. Mitigation may include a filter or other protection being fitted between the power supply and the equipment or, alternatively, a DC: DC converter.
This training will cover