Operating Modes of an Alternating Current Power Supply System

1995 ◽  
pp. 53-68
Author(s):  
Hans Gumhalter
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Alternating Current ◽  
Supply System ◽  
Operating Modes

Potential for the introduction of an alternating current traction power supply system with catenary supports without rail grounding

2020 ◽  
pp. 57-66
Author(s):  
I. A. Kremlev ◽  
◽  
I. A. Teryokhin ◽  
R. B. Skokov ◽  
◽  
...  
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Relay Protection ◽  
Alternating Current ◽  
Supply System ◽  
Electrical Safety ◽  
Rail Network ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
Traction Power

Objective: To study the problems and possible solutions in the introduction of an alternating current traction power supply system with catenary supports without rail grounding. Methods: To solve the set tasks, we used the statements and methods of the theory of power supply, experimental planning, mathematical and system analysis, and the theory of electrical measurements. In the experimental studies, the Trans-AURA Emergency Process Recorder and the Tektronix TDS 2014 Digital Oscilloscope were used, and the Aura2000 and MS Excel 2010 software products were used to process the experiment results. Results: The basic requirements for the AC traction power supply system grounding are presented. The flaws of the traditional grounding system of the catenary supports on the rail network are revealed. Two possible directions are described, which allow eliminating issues during the operation of the AC traction power supply system. The first direction requires the introduction of an additional stage into the traction network protection system, which makes it possible to identify short circuits through a high rail-to-earth resistance. The second suggests the need to revise the relay protection system itself, which includes changing the approach to grounding the catenary structures, the methodology for calculating the relay protection settings, a more detailed analysis of electrical safety conditions, etc. An equation has been formulated to determine support-groupto-earth resistance taking into account the group grounding cable and the existing requirements for ensuring the sensitivity of the main protection means, which allows ensuring reliable operation of feeders’ relay protection. The results of experimental tests of electrical safety conditions and electromagnetic influence are presented. The tasks are identified being the essential prerequisite to the widespread introduction of a system with supports without rail network grounding. Practical importance: The developed methodology for selecting the protection settings will make it possible to operate the AC catenary system without the supports’ rail grounding, as well as introduce the proposed additions to the instructions for grounding traction power supply devices at “Russian Railways”

scholarly journals Vehicle Electromagnets Energy Supply of A.C. Combined Levitation and Traction System

2017 ◽  
Vol 3 (3) ◽  
pp. 25-38 ◽  
Author(s):  
Victor V Nikitin ◽  
Vladimir M Strepetov
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Electrical Equipment ◽  
Alternating Current ◽  
Complex Problem ◽  
Supply System ◽  
Practical Significance ◽  
Energy Factor ◽  
Large Cities ◽  
Traction System

Introduction. The combined levitation and traction system (CLTS) with alternating current represents a kind of electrodynamic suspension system in which the traction and levitation force are created by one set of onboard electromagnets, and the lifting force is provided at any speeds of the crew, including the zero speed. The disadvantages of the system are the low energy factor and the complexity of controlling the start-brake regimes. The scope of such a system can be passenger transportation within large cities and urban agglomerations for distances up to 100 km with speeds up to 150-200 km / h. Goal. The aim of the work is the solution of the complex problem of providing CLTS onboard electromagnets with electric power with an increased energy factor and the ability to control all driving regimes. Method (methodology). Mathematical modeling of electromagnetic and electromechanical processes with subsequent evaluation of technical and economic parameters of the CLTS were used. Results. A practically realizable version of the power supply system for the on-board electromagnets CLTS is proposed. Practical significance. The proposed version of the power supply system has significant advantages over previously considered ones: the ability to flexibly control all modes of CLTS traffic with an increased energy factor. Conclusion. The system of power supply of the CLTS with alternating current from the traction network of constant voltage 3 ... 5 kV with placement of autonomous inverters onboard the crew allows to reduce the mass of the on-board electrical equipment by 10-20%, to minimize the consumption of inactive power and to flexibly control all modes of the crew's movement.

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