TO THE QUESTION OF USE OF 3VL80S ELECTRIC LOCOMOTIVES AT THE SECTION TASHGUZAR - KUMKURGAN OF THE UZBEK RAILWAY

ABSTRACT

The substantiation of the kinematic parameters of the movement of freight trains and energy efficiency indicators of 3VL80^S electric locomotives on the mountain section of the Uzbek railway in quantitative terms is given. The numerical values obtained by the authors are recommended for practical use in assessing the difficulty of the track profile of each section of the Karshi-Termez railway line of the Uzbek railway.

АННОТАЦИЯ

Приводится обоснование кинематических параметров движения грузовых поездов и энергетических показателей эффективности электровозов 3ВЛ80^С на горном участке Узбекской железной дороги в количественном исчислении. Полученные авторами численные значения рекомендуются для практического использования при оценке трудности профиля пути каждого перегона железнодорожного направления Карши – Термез Узбекской железной дороги.

Keywords: investigation, result, the freight train, the electric locomotive, railway, traction mode, idling and braking mode, mountainous.

Ключевые слова: исследование, результат, грузовой поезд, электровоз, железная дорога, режим тяги, режим холостого хода и торможения, горный.

These studies were carried out in parallel with studies [1] for freight trains with a fixed mass of the composition Q = 2500 t and the number of axles m = 200 axles in the composition, which were driven by main three-section electric locomotives 3VL80S without stops and with stops at separate points of the mountain section Tashguzar - Boysun - Kumkurgan of the direction Termez - Karshi of the Uzbek railway.

The results of research [2-4] by scientists from near and far abroad, which, having a certain scientific interest and practical significance, are completely unrelated to the substantiation of the parameters of the main indicators of the energy intensity of the transportation work of traction rolling stock in relation to the real conditions for organizing freight rail transportation on the sections of Uzbek railways.

The purpose of the research was to substantiate the kinematic parameters of the movement of these freight trains and the main indicators of the transportation work of 3VL80^S electric locomotives with an assessment of the traction quality of the hauls of the track profile of the Tashguzar-Kumkurgan section.

The mentioned assessment was made not according to the virtual characteristics of the track profile [5], but according to the total (total) and specific consumption of electric energy for train traction.

As a basis for the implementation of the research goal, we take traction calculations for 3VL80^S electric locomotives when they drive freight trains with a train mass Q = 2500 t and the number of axles m = 200 axles on the Tashguzar – Kumkurgan section, performed by the authors taking into account the recommendations [2] and the initial data [6].

The results of the said traction calculation are presented in table 1 and table. 2, the analysis of which shows that the movement of freight trains without stops at intermediate stations allows:

- reduce the train travel time by 13.69 minutes and increase the technical speed by 2.51 km/h with an average estimated time per stop of 1.71 minutes;

- have a share of movement in modes traction of 25.49%, and idling and braking in 74.51%;

- in relation to the time of the train with stops, reduce the time of movement in the mode traction and in the idling and braking modes, respectively, by 4.14 and 9.55 minutes.

Table 1.

Travel time of a freight train on hauls per passage and intermediate stations for deceleration – acceleration

In table. 3 and in fig. 1 (when moving with stops at intermediate stations) shows the results of calculations of the total and specific consumption of electricity consumed by 3VL80^S electric locomotives when they perform transportation work on hauls and on the Tashguzar-Kumkurgan section.

Table 2.

Travel time of a freight train when moving along hauls and on the section Tashguzar - Kumkurgan of the Uzbek railway

Table 3.

Electricity consumption by electric locomotives 3VL80^S during the movement of a freight train on the section Tashguzar - Kumkurgan of the Uzbek railway

Figure 1. Dynamics of electric energy consumption by electric locomotives 3VL80^S on the hauls of the section Kumkurgan - Tashguzar of the Uzbek railway

As a result of the research, the following values of the main indicators of the use of 3VL80S electric locomotives on the Tashguzar-Kumkurgan section were obtained:

• estimated net travel time of a freight train for hauls and for acceleration-deceleration at intermediate stations;
• driving freight trains without stops, in comparison with similar driving with stops, provides a reduction in total and specific electricity consumption by 2.07 and 2.33 percent;
• Electricity consumption for train traction for one stop at intermediate stations, on average, is 44.00 kWh/stop;
• the average value of the mentioned electricity consumption for the four hauls of the section is, respectively, 285.80 kWh and 7.90 Wh/tkm gross - traffic with stops;
• 232.63 kWh and 6.32 Wh/tkm gross – non-stop driving;
• on the two hauls Tashguzar - Dekhkanabad and Dekhkanabad - Acrobat, there is an increase in the total (specific) consumption of electrical energy, in comparison with its average value, on average, respectively, by 19.46 ... 24.00 (4.89 ... 6, 24) and 27.91...34.20 (7.70...9.60) times.

Thus, numerical calculations have established that the stages Tashguzar - Dekhkanabad and Dekhkanabad - Acrobat are the most difficult stages in the mountain area Tashguzar - Kumkurgan.

As a result of the research, the authors obtained numerical values of the kinematic parameters of the movement of freight trains and the consumption of electric energy by 3VL80^S electric locomotives in quantitative terms, which can subsequently be used for a feasibility study of the electric locomotives working on mountainous sections of railways, including Uzbek ones.

Reference:

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