MODELING OF THE TRACTION CURRENT HARMONICS DISTRIBUTION IN RAILS

Abstract

Electrified railways are one of the most powerful wide frequency range sources of distur-bances that interference on signaling and radio communication systems. This is especially true for new types of vehicles equipped with electronic static converters with pulse width modulation (PWM), from which high-frequency interferences in rails can have frequencies up to several tens of kHz. To ensure the electromagnetic compatibility (EMC) of new types of rolling stock with signal-ing and radio communication systems, they are subjected to an acceptance procedure that in-cludes on EMC tests in accordance with European and national regulatory standards and norms. But under some unfavorable operation conditions for the trains that were successfully tested and are in operation with old vehicles on the same lines (sometimes with old feeding system), the disturbing current generated by vehicles may reach values greater than the allowed values. As such unfavorable operational conditions may be considered increasing number of trains, low dis-tance between track circuit receiver and vehicles or supply substation, low rail-to-earth conduc-tivity and conductivity of earth. To proof the electromagnetic compatibility (EMC) between roll-ing stock and signalling systems it is need accurate modeling of the test cases with taking into account particular operation conditions. The aim of the work is to establish mathematical and computer model for distribution of trac-tion current harmonics in direct feeding traction network with multiple vehicles in feeder zone. This model is an evolution and simplification of models represented earlier. The work has been performed in order to proof the electromagnetic compatibility of new trains equipped with electronic static converters with existing traction lines and has been used during tests of new types of train. The model has been simplified as follows. The lines with equal or close to each other poten-tials are represented as a single line with equivalent electrical parameters. The disturbing vehicles are modeled as sinusoidal current sources with several set of frequencies that are represented by currents vector. Only return current harmonics with frequencies that lie in frequency range of track circuit receiver were considered. Depended of simulation aim the values of harmonics are taken as values measured during train tests or as the maximum interference values according to norms. The distribution of the traction return current harmonics was computed for AC direct feeding traction network 1x25 kV with two-side ESS and with 1 to 5 vehicles in feeder zone. The maxi-mum interference from trains is in the areas nearest to trains and also to the point of connection of return feeder to rails (at ESS terminals). The traction harmonic current in rails are increased with increasing of train number in feeder zone and with decreasing of the rail-to-earth conductiv-ity. The interference at 25 Hz in the rails area near the ESS for one locomotive in feeder zone don’t exceed a limit value of 1 A even in unfavorable operation conditions for of the rail-to-earth conductivity equal 0.02 Sm/km. If number of trains are increased (from 1 to 5) the interference at 25 Hz also increased and it values at rail-to-earth conductivity equal 0.02 Sm/km reach to 1.073 A for two locomotives and to 1.233 A for five locomotives, that exceed the limit value of the interference in rails at 25 Hz.

Authors and Affiliations

V. Havriliuk

Keywords

Related Articles

The method for detecting defects in movable armature of the signalling relay

Despite significant progress in the development of microelectronic rail automatic systems ob-served in recent decades, relay-contact devices are still widely used in railway signalling systems, that are fundamental to th...

Investigation of the influence of the state of the railway track in terms of softness and safety of trains

The need to increase the speed of movement and monitor the technical condition of the rail-way plan leads to the need to study the effect of the state and the parameters of the curves on the smoothness and safety of trai...

Determination of electricity consumption for carrying out acceptance tests of traction electrical machines

Purpose. The aim of the study is to choose the method of rationing of electricity consumption for carrying out acceptance tests of electric machines for traction and motor wagon rolling stock of trunk and industrial vehi...

Research on the collaboration of consumers of their own needs with non-conventional power sources

The purpose of the research work is to study the joint work of consumers of their own needs of traction substation with non-traditional power sources. To implement the use of alternative power on the railway, it is neces...

Parameters and Technology of Experimental Blasts during Drilling of the Left Running Tunnel of the Metro in the City of Dnipro

The problems of effective application of drilling and blasting operations during three experi-mental blasts in the Dnipropetrovsk subway tunnel are considered. The necessity of combined application of short-delay and del...

Download PDF file
  • EP ID EP325996
  • DOI 10.15802/ecsrt2018/171903
  • Views 135
  • Downloads 0

How To Cite

V. Havriliuk (2017). MODELING OF THE TRACTION CURRENT HARMONICS DISTRIBUTION IN RAILS. Електромагнітна сумісність та безпека на залізничному транспорті, 1(13), 20-27. https://europub.co.uk/articles/-A-325996