Transient Current Behaviour during Multiple Lightning strokes on Multiple Unit Trains
This paper studies transient current behaviour during multiple lightning strokes on Multiple Unit trains in pantograph. 2×25 kV AC, 50 Hz Catenary Contact System on double-track elevated railway system which connects Phayathai BTS station in the Centre with Suvarnabhumi Airport in the East of Bangkok was used in the study. This paper investigates effectively in order to reduce breakdown due to overvoltage condition caused by transient current during multiple lightning strokes. The magnitude, front times and tail times of multiple lightning strokes were studied. The assumption of studies based on the return multiple lightning strokes current ranging 1–200 kA, front time of multiple lightning strokes between 1–3 μs, elevated pole resistance of 50 Ω and grounding resistance of 5 Ω. The Catenary Contact System on elevated railway system with Multiple Unit trains and multiple lightning strokes were modelled in ATP-EMTP software. The effect of varying front time of multiple lightning strokes, transient current and mast induced voltage were studied in simulations. Simulations showed that the peak amplitude of mast induced voltage tend to increase when the negative multiple lighting strokes on Multiple Unit trains in pantograph at elevated pole than it is between elevated poles in different front times.
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