Atile, Shimelis (2015) Traction Power Consumption Analysis to Investigate Freight Train Operational Speed. Masters thesis, Addis Ababa University.
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Abstract
This thesis report presents traction power consumption analysis on the existing Ethio-Djibouti electrified railway network, particularly along Awash~Sirba Kunkur~Sebaka Line Subsection. The result of the analysis is recommendation of possible freight train operational speed in the line subsection and the corridor in general to make the subsection occupancy time as short as possible increasing the frequency of services. In this report, Newton‘s Second law of Motion is used for train dynamics modeling. Analytical approach is used to evaluate the model as it provides a quick way to analyze train dynamic behaviors within accepted level of dynamic assumptions. Moreover, the corresponding power quality problems created due to the moving characteristic of the train are evaluated. Train dynamics analysis results show that the traction current required increases continuously and the maximum possible operational speed at the highest gradient is calculated to be 72.4kmph which is less than the freight design speed. Power consumption analysis results show, current drawn from Awash Substation are calculated to be 252A, 431A and 653A and from Sirba Kunkur 604A. Similarly, for a train running between Sirba Kunkur Substation and Sebaka Section Post current values are 238A, 384A and 374A. In both cases the first two current values are during acceleration and notch-up periods in principle which have to be the maximum values. However, even though there is an increase in current demand, the maximum requirements are 653A for 2.724min and 604A for 12.018min which are less than the 848A for 20min, the corridor traction network capacity [8] [9] [31]. The minimum catenary voltage and the maximum traction substation voltage drop are calculated to be 21.6074kV and 2.5926kV which are within the standard limits of 20kV [8] [9] [31] and 6.0kV, see Appendix C Table 2, respectively. Generally, the above train dynamics evaluation and the corresponding power consumption analysis results show that the traction power supply system is under safe condition and could provide the required power to drive the rain at the maximum targeted speed of 72.4kmph. The analysis of the train speed profile results with average train speed of 65.86kmph which improves the proposed average train speed 54kmph [9].
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Train Speed, Train Dynamics, Power Consumption, Traction Modeling, Power Quality Evaluation, Train Resistance Derivation and Fourier series |
| Subjects: | H Social Sciences > HE Transportation and Communications H Social Sciences > HF Commerce Q Science > QA Mathematics > QA75 Electronic computers. Computer science T Technology > TF Railroad engineering and operation T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TL Motor vehicles. Aeronautics. Astronautics |
| Divisions: | Africana |
| Depositing User: | Andriamparany Edilbert RANOARIVONY |
| Date Deposited: | 29 Nov 2018 09:59 |
| Last Modified: | 29 Nov 2018 09:59 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7734 |
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