Does the train use dc or ac?
Alternating current (ac) in 48 v the following safety voltage range Can form loop with a line. A line of fire, tracks or earth is zero. 48 v alternating current (ac) is not allowed above the earth or other bare conductors as the zero line is based on the safety of think. More than 48 v ac voltage, if zero line bad earth contact naked outside zero to get an electric shock accidents. I don't know much about electric motors on the railroad. I haven't seen anything like that. Sorry.
One is a special electric vehicle (figure 3.5.5 _02KD) or a luggage generator that sets up a diesel generator set to make a train station. The work of the train station is controlled by a special switchboard. The electricity generated by the power station is delivered through the transmission line through the full train and the specialized vehicle end connector, which is delivered to the carriages of the train.
The other is in the traction section of the electrified railway, and the electric locomotive is raised by an electric bow, which will supply the 25kV, 50Hz single-phase alternating current to the train substation. Then, after the transformation of transformer, rectifier, converter, etc., the whole train is supplied. This kind of power supply system, the wiring economy, does not use the battery, the vehicle construction cost is low, the power generation is not affected by the train speed. But it has its drawbacks, too, when a power station, a substation failure or a power generation car can be picked off the train. To make up for this, the train can be equipped with a shaft drive as a backup to keep the train running.
It turns out that there is a small generator on the bus, which is the chassis of the coach or the generator that hangs on the frame. Generator through a belt connected to the installed on the axle of the pulley, when the train operation, the wheel rolling, the belt driven in generators and power generation, supply all kinds of electrical appliances use. When the train stops, the wheel does not move, and the generator no longer generates electricity. In order to ensure that the passenger car can be powered by normal power, it is equipped with a battery power system on the passenger bus. When driving, it converts electrical energy from a generator into chemical energy savings, a process called battery charging. When parking, it converts chemical energy into electricity and sends electricity to electricity, a process called battery discharge. Railway on the installation of the generator and battery compartment is called "mother", is not installed the car called "car", the mother car and child: the proportion of the general 1:1. This wheel is powered by a belt that drives a generator, called a shaft generator. This type of electricity is widely used in China's railway trains. This way of power supply of power generation equipment, use is the largest number of J type three-phase ac induction generator, the power only 5 kw, obviously not suitable for power consumption big hundreds of new air conditioning bus
All direct current, of course. The passenger train has a lot of electricity, besides lighting. Especially in recent years to develop the new fast train, quasi high speed trains but also increase the concentration of air conditioning unit, the door remote control, feces JiCun sealing treatment, electrical equipment such as fuel and electric heating and heating device, the maximum power consumption up to 400 kw. So where does the electricity come from?
