Method for identifying risks as a result of stray currents

US6924648B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Martin Altmann · Solothurn, CH
• Wolfgang Braun · Ditzingen, DE
• Ulrich Halfmann · Leopoldshöhe, DE
• Egid Schneider · Weisendorf, DE

Key dates

• Filing date: Aug 12, 2003
• Grant date: Aug 2, 2005
• Expiry date: Aug 12, 2023

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60M5/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method is for identifying risks as a result of stray currents which flow to ground from a rail which returns a traction current in a track with a DC power supply. In accordance with a first embodiment, in which the voltage between the rail and ground is measured and an increased risk as a result of stray currents is indicated if there is a discrepancy from a voltage reference value, provision is made for the voltage to be measured at a plurality of measurement points along the track and for the measurements to be evaluated in an evaluation center. In accordance with a second embodiment, provision is made for activating a short-circuiter to connect a parallel path to the rail for returning the traction current. The current level in the parallel path is then measured and an increased risk as a result of stray currents is indicated if there is a discrepancy from a current-level reference value. Further, the method includes joint evaluation of a plurality of measurements which have been ascertained along the track.