Abstract
The paper deals the problem of the reverse traction current's asymmetry at the AC electrified railways. The features of return traction current system’s operation under conditions of cold climate are considered. The goal of work is to determinate value of return traction current asymmetry coefficient for cold climate regions operating AC electrified railways. To achieve the goal the methods of scientific analysis, imitation modelling, experimental study are used. Types and rationing of return traction current asymmetry are accented. The return traction current system model is created in Multisim 12.0 software for analyse the degree of various factors influence on the return traction current's asymmetry. Main influencing factors for asymmetry coefficient in cold climate regions as a traction current value and catenary tower resistance are considered. The calculated graphic dependences of the asymmetry coefficient as a function of the traction current and the catenary tower resistance are given. Algorithm for identifying the critical zones (hazardous areas) by graphical dependencies and predicting the system's predicament states is described.
Highlights
All transport services are dependent upon the atmosphere, weather and climate
The AC electrified railways infrastructure is designed so that the traction current from contact wire through locomotives should go by the running rails to traction substation, but occasionally the ground acts as a conductor, transmitting current to areas that are distant from the rail [2, 3]. This circuit in traction power supply system is called as a return or reverse traction current system and plays very important role in functioning of railways signals and interlocking system and in railways power supply system [2, 4]
The asymmetry coefficient KA was calculated by equation (1)
Summary
All transport services are dependent upon the atmosphere, weather and climate. The weather determines the success of daily operations and can cause significant delays at all times of year due to extremes of temperature, precipitation, wind and humidity. The AC electrified railways infrastructure is designed so that the traction current from contact wire through locomotives should go by the running rails to traction substation, but occasionally the ground acts as a conductor, transmitting current to areas that are distant from the rail [2, 3]. This circuit in traction power supply system is called as a return or reverse traction current system and plays very important role in functioning of railways signals and interlocking system and in railways power supply system [2, 4]. The return traction current system plays the most important role in ensuring traffic safety and road carrying capacity because its elements are transmitters for signal current of centralized control blocking (CCB) and automatic train control (ATC) devices
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