An Identification Method of Faulty Train for a Straddle-Seat Monorail DC Traction System
When a short-circuit fault occurs between the positive pole of a high-voltage DC circuit for a train and its carbody inside the station in a straddle seat monorail DC traction system,this causes the carbody grounding relay(GR)of all trains inside the station to actuate and the circuit breakers of the train to trip.Meanwhile,this also triggers multiple 64D grounding protection actions and trips the circuit breaker of the DC feeder.The fault results in a loss of power to the DC traction system.It is necessary to identify the faulty train and restore the normal power supply of the DC traction system as soon as possible to reduce the impact of the accident.First,the study analyzed characteristic differences in the amplitude of the grounding current and negative receiving electricity current for a faulty train compared to a normal train when a short-circuit occurred between the positive circuit and the carbody based on the equivalence model of the DC traction bipolar power supply system for straddle monorail transportation.Second,an identification method for a faulty train is proposed based on a comparison of the grounding current and negative current amplitude.The identification procedure is activated when the grounding current exceeds a predetermined threshold.If the grounding current amplitude is greater than the negative current,the train is identified as faulty;otherwise,it is considered to be in a normal state.The accuracy and effectiveness of this method were validated through MATLAB simulations and field tests.The proposed approach is simple,practical,and highly reliable,providing a strong safeguard for the safe operation of straddle-seat monorail systems.
urban rail transitDC traction systemfault identificationgrounding currentnegative electric currentstraddle-seat monorail
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