Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2005-08-02
2005-08-02
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S500000
Reexamination Certificate
active
06924648
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.
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Mercury Instruments Limited, “Stray Current Monitoring on D.C. Electrified Lines”, Application Note, No. 8, XP-002261462. May 2000.
Dev Paul, “DC Traction Power System Grounding”, pp. 2133-2139. 2001, no month available.
2001 IEEE/ASME Joint Rail Conference, Apr. 17-Apr. 19, 2001, Analysis of Stray Current, Track-to-Earth Potentials & Substation Negative Grounding in DC Traction Electrification System, pp. 141-160.
Altmann Martin
Braun Wolfgang
Halfmann Ulrich
Schneider Egid
Harness & Dickey & Pierce P.L.C.
Nguyen Vincent Q.
Siemens Aktiengesellschaft
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