TO THE EFFICIENCY OF USING ELECTRIC LOCOMOTIVES 3VL80S ON THE HILLY - MOUNTAINOUS SECTION OF THE RAILWAY

ABSTRACT

The results of studies on the assessment of the energy efficiency of the use of 3VL80^S electric locomotives on a hilly-mountainous section of the railway track when freight trains move without stops and with stops at intermediate stations, sidings and separate points are presented.

АННОТАЦИЯ

Представлены результаты исследований по оценке энергетической эффективности использования электровозов 3VL80^S на холмисто – горном участке железнодорожного пути при движении грузовых поездов без остановок и с остановками на промежуточных станциях, разъездах и раздельных пунктах.

Keywords: freight train, electric locomotive, railway, parameter, station, time, speed, traction calculation, hilly-mountainous, stop, expense.

Kлючевые слова: грузовой поезд, электровоз, железная дорога, параметр, станция, время, скорость, тяговый расчёт, холмисто – горный, остановка, расход.

The present studies are a logical continuation of the works [1,2] and are devoted to determining the kinematic parameters of the movement of freight trains and the parameters of the main indicators of the transportation work of the main (train) three-section electric locomotives 3VL80S on the hilly-mountainous section of Marokand - Navoi of the Uzbek railway. The driving of freight trains with the maximum train mass Q = 3500 t for the studied railway direction and the number of axles in the train m = 200 axles was organized by the mentioned 3VL80^S electric locomotives without stops and with stops at intermediate stations, sidings and separate points.

The implementation of the research goal was carried out by performing a "classical" traction calculation, using the nominal position of the controller of the driver of the studied electric locomotive in combination with idling and braking modes, the initial data [1,3] and recommendations [4-6] of the theory of locomotive traction.

The results of the traction calculation are given in table. 1 and table. 2, where the values of some kinematic parameters of the movement of freight trains along the hauls of the hilly - mountainous section of Marokand - Navoi of "O'zbekiston temir yo'llari" JSC are indicated.

Table 1.

The travel time of a freight train for hauls per passage, intermediate stations, sidings and separate points for deceleration – acceleration

Table 2.

Distribution of the travel time of a freight train in the organization of transportation work electric locomotives 3VL80^S on the hilly-mountain section of Marokand-Navoi

The mentioned movement was carried out by main (train) cargo three-section electric locomotives 3VL80^S, taking into account the realization of the maximum possible power of power energy systems and traction qualities (properties) of the locomotive, as well as the kinetic energy of the train on each specific element of the track profile.

Analysis data table. 1 and table. 2 shows that the movement of freight trains on a given hilly-mountainous section of the railway, organized with stops at intermediate stations, sidings and separate points in relation to similar movement without stops at them, provides:

• an increase in the total time of the train by 11.6 minutes with a decrease in the technical speed of movement by 7.3 km/h with an average estimated time per stop of about 1.66 minutes;
• the values of the shares of movement in traction modes by 27.73 percent, and idling and braking by 72.27 percent;
• decrease - increase, respectively, of the shares of movement in the modes of traction, idling and braking by about 2.6 percent.

In table. 3 shows the values of the total (full) and specific consumption of electrical energy, which was spent by the main (train) freight three-section electric locomotive 3VL80S in the process of organizing the movement of only its (specific) freight train along the hauls of the hilly-mountainous section of Marokand - Navoi of the Uzbek railway.

The values of the total (total) and specific consumption of electrical energy, indicated in table. 3, were determined (calculated) according to well-known formulas [4-6] taking into account the integral curves we previously constructed for the speed V (S) and travel time t (S) of the train, current I (S) for the electric locomotive under study on the aforementioned hilly - mountain section of the railway.

Table 3.

Consumption of electrical energy by 3VL80^S electric locomotives during the movement of a freight train along the stretches of the hilly-mountainous section of Marokand - Navoi

On fig. 1 shows a diagram of the distribution of the average time of movement of a freight train along the hauls, taking into account the various modes of operation of the power energy systems of electric locomotives 3VL80^S, when they organize rail transportation of goods on the hilly-mountainous section of Marokand - Navoi "O'zbekiston temir yo'llari" JSC.

Figure 1. Distribution of the average travel time of a freight train along the stretches of the hilly - mountainous section of Marokand – Navoi

On fig. 2 shows the distribution diagram of the averaged total (total) and specific consumption of electrical energy for hauls of the hilly - mountainous section of Marokand - Navoi, spent by the main (train) three-section electric locomotives 3VL80^S for organizing the movement of freight trains in real operating conditions.

Figure 2. Dynamics of the average consumption of electric energy by electric locomotives 3VL80^S along the stretches of the hilly - mountainous section of Marokand – Navoi

On fig. 2 the average value of the specific consumption of electrical energy by the main (train) three-section freight electric locomotives 3VL80S has been increased thirty times.

As a result of our research, the following values were obtained for the parameters of some of the main indicators of the transportation work of the main (train) three-section electric locomotives 3VL80S on the hilly-mountainous section of Marokand - Navoi "O'zbekiston temir yo'llari" JSC:

• the average estimated net travel time of a freight train along the hauls and the total acceleration-deceleration time at intermediate stations, sidings and separate points, respectively, is approximately 15.55 and 2.3 minutes;
• driving freight trains with stops at intermediate stations, sidings and separate points, in comparison with similar driving without stops at the latter, provides an increase in electrical energy consumption, on average, by approximately 27.49 percent;
• the consumption of electrical energy for one stop at intermediate separate points is approximately 168.74 kWh;
• specific consumption of electrical energy per stop is approximately 0.351 Wh / t km gross;
• the average value of the total (total) and specific consumption of electrical energy for each stage of the section, respectively, is 613.78 kWh and 1.274 Wh / t km gross - movement without stops at intermediate stations, sidings and separate points, as well as 782.53 kWh and 1.626 Wh/t gross km – traffic with stops at the latter;
• the average value of the average value of the total (total) and specific consumption of electrical energy for both types of traffic on each stage of the section, respectively, is approximately 698.16 kWh and 1.45 Wh/t km gross.

The kinematic parameters of the movement of a freight train and the values ​​of the consumption of electrical energy consumed by the main (train) freight three-section electric locomotives 3VL80^S in the process of implementing rail transportation of goods of different content and structure on the hilly-mountainous section of Marokand - Navoi are recommended to specialists of the locomotive depot operation shop Bukhara of "Uzbekiston" temir yo'llari" JSC. And, they can be used in the practice of the work of machinists - instructors in heat engineering, who are involved in the development of regime maps for driving freight trains on real hilly - mountainous and other virtual railway sections identical to them.

Reference:

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