Real-time defect detection in power conduction devices for rail transportation
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Abstract:
System integrity is critical for completion of journey in rail transport systems. System integrity is dependent on the catenary line, pantograph and the train tracks in addition to the locomotive and the wagons. Catenary line and pantograph are the main devices for transmission of electricity to the locomotive. The level of tracks has a direct influence on the continuity of conduction between the catenary line and the pantograph. Settling of tracks momentarily separates the conduction devices, resulting in arcs. In this study we aim to detect catenary line, pantograph and track related problems automatically and in real time for safety of railroad transportation.Keywords:
Catenary
Pantograph
Line (geometry)
Rail transportation
In a current railway system, there is a problem that pantographs are sometimes detached from catenary. The faster the train becomes, the more problematic it would be. We investigate experimentally and discuss the problem using the simple model, of which the motion takes place in a mechanical similar manner with the real pantograph.
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The model optimization and solving of the pantograph-catenary system on electrified railway were researched. And the influence of contact wire pre-sag on current-collecting of pantograph-catenary system was analyzed. In this paper,the motion equations were given,treating the catenary as a system with stiffness changing constantly and combining with the pantograph system. Newmark method was used to solve the equations. According to above method,the simulation model of the pantograph-catenary system was established with ANSYS software. The influence of the contact wire pre-sag on current-collecting quality of pantograph-catenary system was discussed. The simulation results are in accord with actual requirement,and can provide some reference for the design of cate- nary.
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Pantograph
Contact force
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The method to test the pantograph catenary system for the electric railway at present is introduced in this paper. The system composition,working principle and applied situation in the field are given for the device which is used to detect the faults of the pantograph contact line and installed in the operating electric locomotives.A comparison between the device and the catenary inspection car is made.
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Pantograph
Line (geometry)
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Domestic and oversea researches on mechanism of arc,arc energy loss,discipline of friction and wear with current and pantograph and catenary materials were discussed,and probable issues during studies and related researching direction were pointed out,which supplied a foundation for further researches on electrical contact between pantograph and catenary.
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Pantograph
Foundation (evidence)
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System integrity is critical for completion of journey in rail transport systems. System integrity is dependent on the catenary line, pantograph and the train tracks in addition to the locomotive and the wagons. Catenary line and pantograph are the main devices for transmission of electricity to the locomotive. The level of tracks has a direct influence on the continuity of conduction between the catenary line and the pantograph. Settling of tracks momentarily separates the conduction devices, resulting in arcs. In this study we aim to detect catenary line, pantograph and track related problems automatically and in real time for safety of railroad transportation.
Catenary
Pantograph
Line (geometry)
Rail transportation
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Understanding the dynamic interaction between the catenary and pantograph of a high-speed train is the one of the most important technical issues in the railway industry. This is because the catenary–pantograph system plays a crucial role in providing electric power to the railway vehicle for stable operation. The aim of the present paper is to estimate the current-collection performance of this system by using numerical analysis, in particular, the flexible multibody dynamic analysis technique. To implement large deformable catenary wires, an absolute nodal coordinate formulation is used for the cable element. Additionally, an efficient contact element and an interactive model for the catenary–pantograph system are introduced. Each developed model is then used for analytical and experimental verification. Actual on-line test results of existing high-speed railway vehicles are presented and used to verify the analysis model. Finally, the performance characteristics of a new 400 km/h-class high-speed line are estimated and evaluated on the basis of international standards.
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Line (geometry)
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High speed electric multi units (EMU) get power through pantograph-centenary electrical contact. As the EMU running velocity increases, rail surface irregularities, undulations of the catenary and vibrations of the pantograph head cause the status of pantograph-centenary electrical contact to deteriorate seriously and generate pantograph-catenary arcs frequently. The arcs erode the contact wire and pantograph strip, endanger the current-receiving quality between pantograph and catenary and restrain further raizing of the EMU speed. So it is very important to study the pantograph-catenary arcs. In this paper, the pantograph-catenary current-receiving process was analyzed. The pantograph-catenary arc test system was developed, which simulated the flexible and straight contact of pantograph and contact wire, pantograph strip zigzag movements and vertical up and down movements of the pantograph. The test system was used to study, the pantograph-catenary contact resistance, and the electrical parameters and shape features of the arcs.
Pantograph
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Contact force
Electric arc
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Current Collection Mode of High Speed Train-Pantograph Catenary System -- Electrical Contacts of Pantograph Catenary System -- Friction and Wear with Electric Current of Pantograph Catenary System,- Pantograph-catenary Arc -- Electrical contact materials of Pantograph Catenary System -- Diagnosis and detection Service Properties of Pantograph Catenary System.
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Pantograph
Electrical contacts
Service life
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Using a GE-635 computer program developed for the U.S. Department of Transportation, a study has been made of the effect of changes in the catenary-pantograph system on the quality of power collection at high speeds. The study explored the effect of: (a) Sag between towers, (b) pantograph spacing, (c) stiffness of the tower support, (d) damping and stiffness of the pantograph, (e) stiffness of the contact spring, (f) dropper stiffness, (g) dropper spacing. It was found that all of these have a significant effect on the constancy of the contact force between catenary and pantograph. By proper choice of system constants, the contact force variation can be substantially reduced. A basis is provided for selecting suitable system constants for a given range of operating conditions.
Pantograph
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Contact force
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In electrified railway,electric locomotive run through contact with the top of the pantograph and contact line to get the power. And when the pantograph and catenary separate,arc phenomenon will happen and cause serious influence of railway communication and locomotive power supply. Through the extraction and analysis of the catenary arc spectrum,this paper proposed an arc detection system based on( 250 ± 10) nm ultraviolet light and composed of the optical imaging system,ultraviolet light sensing systems,data analysis and processing system. Through the real-time detection of the arc of pantograph-catenary,it will get pantograph-catenary current quality situation. On the basis of the analysis result,fixedly-point maintains pantograph and catenary to improve the quality of current receiving to ensure the safety of railway operation.
Pantograph
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Electric arc
Arc lamp
Line (geometry)
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