Abstract
Catenary icing seriously affects the safety and reliability of the traction power supply systems of electric railways. To prevent icing damage without interrupting normal train traffic, an online anti-icing technique using the Joule-effect is presented. In this scheme, anti-icing current flows are adjusted over the entire catenary in accordance with not only environmental parameters, but also traction network voltage requirements. Determination of the requisite anti-icing current is based on a circuit analysis of a direct feeding system. The viability of the technique for a direct feeding system is demonstrated by simulation and experimental results in terms of both its thermal and electrical aspects. It is shown that the anti-icing system does not affect line protection operation under normal operational and various fault conditions, and requires no adjustment of the settings of the protective relays.
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