The principle aspect of overhead railway equipment is about energy supply method that supplies electrical current to the traveling train car. The entire structure of an overhead railway line entails suspended energy supply lines which can be supported at regular intervals and with common level of tension which is adjustable tra chanh quan
The overhead method is essentially meant for two traveling bodies; the electrical train plus the trolleybus, also referred to as tram. These two bodies define the key differences among the offered overhead energy supply systems.
For the tram, there’s a two parallel line supply method though the train utilizes only one reside wire supply method for its energy supply. An electrical train calls for only one reside wire since it derives the return channel from its wheels which have get in touch with using the steel bars. However, a tram or trolleybus rides on rubber tires, which calls for the need to have two supply channels within the energy supply method.
Other feasible differences within the supply channels that you might notice are voltage supply. There are actually differences across nations as to the level of energy which is produced to feed the rail supply method. It is also crucial to note that exactly the same railway path which is supplied with overhead energy transmission method might be employed by regular trains at no effect.
Technical elements of overhead railway gear
Electric trains connect to the energy supply cables through a specific device that is identified as pantograph. There are actually other terms for this device for example bow collector, or trolley pole. This pantograph is attached to the lowest wire in an overhead line method, that is identified as get in touch with wire.
The pantograph causes oscillations to the get in touch with wires, that are also the energy supply mediums. One particular danger which will probably show up with that is that the shock waves that bring about oscillations to the get in touch with wires could bring about breakage. In a bid to prevent this effect from taking location, the wires are subjected to tension. Tensioning features a mechanical advantage in that it enables the shockwaves to travel quicker than the moving train.
How tensioning is applied to overhead railway gear tra chanh quan
There are actually two principal techniques of reaching tension using the overhead railway line – auto-tensioning and continuous tensioning. Auto-tensioning entails occasional use of hydraulic tensioners that load weight around the transmission medium at particular occasions based on particular circumstances. Continuous tensioning is about applying weights all through to the method to tighten the transmission cables.
The level of tension in every wire prices somewhere amongst nine and twenty newtons, or rather 2000 to 4500 pound forces. The applied weights are attached to the mast and only permitted to travel up and down in lieu of horizontally, which would have caused them to sway.Tai Iwin 257
The principle difference amongst the fixed tensioning and automatic tensioning is defined by speeds of traveling trains. Low speeds by the train permit for fixed tensioning though high speeds will be tensioned automatically by hydraulic mechanism. The entire notion is about monitoring and effecting the suitable level of tension in overhead railway gear.