What Is Electrical Supply Track System?

December 23,2021

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The electrical supply track system is an ancient railway power supply method, which is usually used in the mass transportation system. As an Electrical Supply Track System oem, today, we will introduce in detail what is the electrical supply track system and its advantages and disadvantages.

 

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What is an electrical supply track system?

 

As the name suggests, the concept of an electrical supply track is to add live rails in addition to the two rails on which the train travels. This live rail is usually located between two rails or on the outside of one of the rails. The collector device of the electric train touches and slides on the track with an electric circuit, and transmits the electric power to the train.

 

The voltage of the electrical supply track system is lower than that of the rack cable system. Overhead cables can generally provide 25,000 volts or more of alternating current, but the third rail system can only provide about 1,500 volts of direct current.

 

Advantages and disadvantages of electrical supply track system

 

Advantages

 

  • The cost of installing live rails is often lower than that of overhead cables because overhead cables require brackets and electric rails are not used. The cost issue is the main reason why many electrical supply track systems do not switch to overhead cables.

 

  • The impact of natural disasters on live rails is higher than that of cables (except for flooding).

 

  • Live rails are more suitable for installation in tunnels with smaller headrooms than overhead cables.

 

  • Some passengers think that the overhead cables are unsightly, compared to live rails that have better visual effects.

 

Disadvantages

 

Voltage problem: The voltage of the electrified rail should not be too high, otherwise the current will form an arc between the rails. Because the voltage is not high, a power station must be set up every short section during the construction of the railway to ensure a stable power supply-but this also adds to the cost, so it is only suitable for short-distance subways or urban rail transportation.

 

Current loss: As the live track is close to the ground, sometimes the current is lost to the ground. Some electrified rails will be added with aluminum bars to reduce a current loss (because aluminum has better electricity transfer capacity than steel). However, because the expansion response of aluminum to heat is different from that of steel, to avoid damaging the live rail, both sides of the live rail must be bolted tightly by aluminum bars.

 

Gap problem: At the switch and level crossing, the live track must leave a gap to allow other trucks to pass through. Generally speaking, the trains using track power supply are EMUs, and the trains almost have more than one collector shoe, so the gap will not pose any problem. However, in some cases, the train may still be unable to move because all collector shoes are in the gap and can not obtain power. At this time, the train needs to be pushed by other locomotives or connected to the nearest circuit track with emergency cables to obtain power. As these accidents occur more frequently at busy interchanges, they usually lead to serious congestion and delays.

 

If you are looking for a professional Electrical Supply Track System factory, we look forward to being your choice. Any interests, welcome to contact us.


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