Trystan Casey
Electric traction is a system that uses electrical power to move vehicles forward. It is also referred to as a traction system or electrical traction. Electric traction is considered to be the most efficient system compared to other systems such as steam and internal combustion engines. Electric traction is widely used for railways, trams, trolleys, and buses. It is also used for freight trains and urban and suburban trains. Electric traction has many advantages over non-electric traction systems, such as being more environmentally friendly, having lower running costs, and requiring less maintenance.
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What You'll Learn
- Electric traction is a system that uses electric power to move vehicles forward
- Electric traction systems have benefits over non-electric systems, like being cleaner, easier to handle, and more efficient
- Electric traction systems can be self-contained or receive power from an electric distribution system
- Direct current (DC) traction units use current from a third or fourth rail, ground-level power supply, or overhead line
- Alternating current (AC) traction units involve an inverter and produce variable traction output
Electric traction is a system that uses electric power to move vehicles forward
- Quick start and stop capabilities
- Efficiency
- Lack of pollution
- Easy handling
- Easy speed control
- Low maintenance and running costs
- Quick acceleration, ideal for urban and suburban services
- High power, suitable for heavy freight trains in hilly areas
Electric traction systems can be classified into two main types: single-phase AC (alternating current) traction drive and DC (direct current) traction drive. The choice between AC and DC systems depends on various factors, including availability, application area, and service type. For instance, DC traction systems are preferred for heavy trains requiring rapid acceleration due to their high torque at low speeds. On the other hand, AC traction systems have gained popularity due to their advantages, such as easy control of AC motors, fewer required substations, and light overhead catenaries.
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Electric traction systems have benefits over non-electric systems, like being cleaner, easier to handle, and more efficient
Electric traction refers to the use of electrical power for traction systems, such as railways, trams, and trolleys. Electric traction systems have advantages over non-electric systems, such as steam and internal combustion engine systems. Electric traction is cleaner, easier to handle, and more efficient.
One of the key benefits of electric traction systems is their environmental friendliness compared to diesel or steam traction. Electric systems produce zero emissions, making them ideal for urban and suburban areas where air quality is a concern. In contrast, steam locomotives use coal or petroleum as fuel, leading to poor fuel efficiency and increased pollution.
Electric traction systems are also easier to handle and maintain. They offer quick start and stop capabilities, easy speed control, and dynamic braking. The braking system in electric traction is fast and reliable, and the braking force can be controlled to stop the motor within a predetermined short time. Additionally, electric traction systems have lower maintenance costs due to fewer moving parts and less complex machinery.
Electric traction systems are more efficient than non-electric systems. They provide rapid acceleration, which is ideal for heavy trains and urban/suburban services. The high starting torque and moderate speed control of DC series motors are well-suited for traction systems, and they consume less energy compared to AC units. Electric traction systems also have lower running costs due to their high efficiency and reduced fuel consumption.
Furthermore, electric traction systems offer design advantages. DC traction motors are lighter and more compact than other systems, making them ideal for space-constrained applications. Additionally, electric traction systems have fewer electrical interference issues with nearby communication lines.
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Electric traction systems can be self-contained or receive power from an electric distribution system
Electric traction refers to the use of electrical power for traction systems, such as railways, trams, and trolleys. Electric traction systems can be self-contained or receive power from an electric distribution system (substations).
Self-contained electric traction systems are independent and do not rely on external power sources. These systems are typically found in vehicles that are powered by batteries or other self-contained energy sources. They are often used in situations where external power supply is not readily available or practical, such as in remote areas or for specific vehicle types.
On the other hand, electric traction systems that receive power from an electric distribution system are connected to a central power source. This power source can be in the form of overhead lines, third rails, or other electrified components that supply electricity to the vehicles. This type of system is commonly used in urban and suburban areas, where a consistent and reliable power supply is available.
The choice between self-contained and externally powered electric traction systems depends on various factors, including the availability of infrastructure, the type of application, and the specific requirements of the vehicle or system in question.
One advantage of self-contained systems is their flexibility and independence, as they are not limited by the range or accessibility of external power sources. They can operate in areas where electric distribution systems may not be present or well-developed. Self-contained systems are also often used in situations where quick acceleration and manoeuvrability are required, such as in certain industrial or specialised vehicles.
However, externally powered electric traction systems offer their own set of benefits. They are generally more efficient and cost-effective, especially for long-distance travel or in situations where frequent stops and starts are not required. Externally powered systems also tend to have lower maintenance costs and can provide a more consistent and reliable source of power.
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Direct current (DC) traction units use current from a third or fourth rail, ground-level power supply, or overhead line
Electric traction, or electrical traction, refers to the various types of locomotive and multiple units that are used on electrification systems around the world. Electric traction systems use electrical power to generate movement, and are used for railways, trams, and trolleys.
Direct current (DC) traction units are one type of electric traction system. They use current from a third or fourth rail, a ground-level power supply, or an overhead line. The third and fourth rail systems operate at low voltages (600-1200V), while overhead rail systems use high voltages (1500-3000V). DC traction motors are a better choice than AC motors for heavy trains that require frequent and rapid acceleration, as they provide high torque at low speeds and low torque at high speeds. DC trains also consume less energy than AC units when operating under the same service conditions. Additionally, DC traction systems are less costly, lighter, and more efficient than AC traction systems. They also do not cause electrical interference with nearby communication lines. However, one disadvantage of DC traction systems is the need for expensive substations at frequent intervals, as well as the requirement for heavier and larger overhead wires or third rails.
The selection of a DC electrification system offers several advantages, including rapid acceleration and braking of DC electric motors, space and weight considerations, lower costs compared to AC systems, and reduced energy consumption. The three-phase power received from power grids is de-escalated to low voltage and then converted into DC by rectifiers.
In terms of voltage, DC traction systems can vary. For example, in Southern England, some dual-system locomotives use both overhead lines and third rail systems, with voltages of 750 V DC for the third rail and 25 kV AC for the overhead line. Another example is the Eurostar trains through the Channel Tunnel, which utilise 1.5 kV DC, 3 kV DC, 15 kV 16.7 Hz AC, and 25 kV 50 Hz AC.
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Alternating current (AC) traction units involve an inverter and produce variable traction output
Electric traction refers to the various types of locomotive and multiple units that are used on electrification systems around the world. Electric traction systems offer several benefits over steam traction, including quick acceleration and power. Direct current (DC) traction units use current drawn from a third rail, fourth rail, ground-level power supply, or an overhead line.
Alternating current (AC) traction units are equipped with an inverter and produce variable traction output based on the frequency of the AC current. In the context of electric vehicles, a traction inverter is a power electronic device that converts a direct current (DC) supply from the vehicle's batteries into an alternating current (AC) output. The inverter does not produce any power; instead, the power is provided by the DC source. The AC motor's current must alternate the direction of flow between positive and negative according to the motor shaft rotation and desired torque. The faster the motor speed, the more frequent the alternation of current, and this variable rate of changing current direction is precisely controlled by a traction inverter.
The primary function of the traction inverter is to ensure the correct current is flowing in the motor phases at any given time by continuously monitoring the motor shaft angle and calculating the necessary current to produce the desired torque. Traction inverters are essential for achieving optimal performance and efficiency in electric and hybrid vehicles. They are found in all types of electric land vehicles, including trains, mining equipment, and increasingly, cars and trucks.
In the case of railway electric traction, AC traction units are used in most modern rolling stock due to their lower maintenance costs and easier scalability compared to DC units. The variety of railway electrification systems, even within a country, means that trains often have to pass from one system to another. This can be achieved by changing locomotives at switching stations, which have overhead wires that can be switched to a different voltage. However, this method is time-consuming and expensive.
Another approach is to use multi-system motive power that can operate under several different voltages and current types. For example, Eurostar trains through the Channel Tunnel are multisystem, passing through sections with different voltages and current types.
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Frequently asked questions
Electric traction is a locomotion system in which the driving force is obtained from electric motors.
Electric traction is quick to start and stop, efficient, clean, easy to handle, and has easy speed control. It is also environmentally friendly and has low running costs.
Electric traction systems can be self-contained locomotives or vehicles that receive power from an electric distribution system (substations). The three main types of electric traction systems are AC, DC, and composite systems.
Electric trains are an example of electric traction. Electric trains run on fixed rails and can be classified as either mainline or suburban trains.
