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Pantograph of an en-energized train may never run through n neutral section. As it does so, the arc generated across the pantograph will likely short the two feeding lines together at both sides of the neutral section where two phases are separated, The fault is called out-of-phase short-circuit fault for which short two out-of-phase feeding lines. Traditional feeder distance protection and current...
To feed electric train, the structure of traction power supply system is very different from utility grid. The single-phase traction loads result in some problems, such as negative sequence, harmonics, reactive power and crossing neutral sections. Based on the existing traction power supply system, the active power filter is used to construct cophase traction power supply system. It not only eliminates...
In traction power supply system of China High-speed Railway, the transient process of EMU has a great difference between the state of passing by Phase-separation with electric load and passing by Phase-separation without electric load. The overvoltage caused by switch in with arc in the process will influence the correct operation of the common protection device. Based on the theoretical analysis...
Start from Beijing-Tianjin intercity dedicated passenger line, a new 2 × 25 kV autotransformer feeding is applied to China high-speed railway. The traction power supply system is different from China common-speed electrified railway. In this paper, the traction power supply system, the course of fault isolation and supply recovery are introduced. According to normal operation and emergency operation,...
This paper presents a novel detection criterion for transformer inrush. The current magnitudes calculated by one-cycle Fourier filter will not change or change little with time, no matter for inrush current or internal fault current, because the filter window length is just the same as the power cycle. However, the magnitudes of inrush current calculated by short-window filter algorithm have distinct...
This paper analyzes the effects of flow-through inrush on CTs, especially on transformer and its differential protection. The flow-through inrush can cause the transformer to produce series-type sympathetic inrush, when the series-type sympathetic inrush current is followed by heavy CT saturation in the secondary side of transformer, false operation may be introduced in the existing 2nd harmonic restraint...
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