Abstract
The 2 × 25 kV power supply system is the most frequently used traction rail system to provide the huge power needed by high-speed trains. However, locating the ground fault in this power supply system is more complicated than in other configurations of electrical railway power supply due to the installation of autotransformers throughout the line section. In previous papers, the authors have described a ground fault location method with an insignificant installation cost. The method and, moreover, the location discriminate between whether the ground fault is located between a positive conductor and ground or a negative conductor and ground. The current of the high-speed train influences the accuracy of the location of the ground fault. An additional factor which influences the location method is the existence of an arc resistance between the positive or negative conductor and ground. In this paper, the influence of high-speed train currents and arc resistances are analysed to evaluate the error in the location method. The major conclusion of the paper is that the location method has an acceptable precision even taking into consideration the high-speed train current and arc resistance. The validation of the method has been performed by laboratory tests and computer simulations with satisfactory results.
Highlights
High-speed trains are one of the more effective and faster modes of transport between medium and big cities with distances in the range of 600 km.To supply the high power demand of these trains, a 2 × 25 kV AC power supply system is used, due to the advantages of providing high power with lower currents and fewer traction substations on the line [1].In a 2 × 25 kV supply system, the power in the line is supplied by some traction substations (TSs)
Numerous computer simulations have been performed to analyse the effect of the high-speed train circulation and fault resistance in the ground fault location
Inorder ordertoto to study the influence on angles the angles angles between the current current and the voltage voltage and the the current modules in the autotransformers when the ground fault occurs with an arc resistance, modules in the autotransformers when the ground fault occurs with an arc resistance, numerous current modules in the autotransformers when the ground fault occurs with an arc resistance, numerous have simulations have been performed
Summary
High-speed trains are one of the more effective and faster modes of transport between medium and big cities with distances in the range of 600 km. To supply the high power demand of these trains, a 2 × 25 kV AC power supply system is used, due to the advantages of providing high power with lower currents and fewer traction substations on the line [1]. Each substation feeds two sections, one in each direction, and each section is formed by some subsections delimited by autotransformers (ATs). The positive conductor (usually named as the catenary) is at 25 kV AC voltage with a positive polarity from ground. The negative voltage conductor (usually named as the feeder) is at 25 kV AC voltage with a negative polarity from ground. B, and C), displays the diagram simplified of power a 2 × 25system kV power system sectionthree comprising three(A, subsections delimited by C), three autotransformers.
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