1). Evaluation of merits and demerits of different earthing schemes, including
Totally floating system
Direct earthing at substations
High resistance earthing at substations
Diode earthing at substations with stray current collection mats and
earth current return wire
2). Introduction of different earthing devices:
Spark gaps
non linear resistors
RPCD - rail potential control devices, including
OVPD - over voltage protection devices
(as installed in Lantau & Airport Railways. Hong Kong)
FNAGS - floating negative automatic grounding switches
(as installed in Ankara Metro, Turkey)
3). Simulation of DC power supply systems, incorporating earthing strategies
4). Effects of earthing strategy on touch voltage control and stray current control
For some detailed explanation of RPCD, click here.
For a trechnical paper on earthing simulation, click here.
