Industrial optical fiber in train transportation system

Train propulsion system

Electric trains and diesel trains are the most common modern trains. The main difference between these two types of trains is the way the trains are powered. Regardless of whether the main energy source is grid electricity or diesel generators, the power conversion process from energy sources to the propulsion power of the traction motor and the auxiliary power generation of the on-board electrical system is very similar. The process of converting grid and diesel energy into usable power is shown in Figures 1 and 2

Common Avago fiber optic parts used in train propulsion, control and monitoring systems are as follows:

Since the distance between the control board and the converter is usually short, POF or hard coated silica (HCS) cables are often used. Fiber optic transmitters and receivers that support switching speeds from DC to 5 MBd or DC to 10 MBd are usually used in this application. As shown in Table 1, the Versatile Link product line provides the most cost-effective and reliable solution to solve this application.

Train communication system

Optical glass fiber and POF are usually the preferred media in locomotives because of their high resistance to electrical noise in the locomotive environment. Fiber optics connect the controller to devices and subsystems, such as power electronics, motor controllers, brakes, and radios. Figure 3 shows the general MVB layout in a locomotive.

Figure 3. MVB layout in a locomotive

Figure 4. MVB layout in Coach

As shown in Figure 4, the MVB is also connected to the equipment in the coach to control lights, doors, air conditioning and passenger displays. In order to increase network availability, MVB is backed up by redundant lines, and the equipment is transmitted on two lines. If one line fails, the other line can be used for communication.

When realizing MVB with optical fiber, the star coupler is used to restore the signal quality of a maximum of 4095 devices connected to a bus, as shown in Figure 5. The MVB data rate is fixed at 1.5 Mbps and can be handled easily. HFBR-1412Z transmitter and HFBR-2412Z receiver fiber optic components.

Figure 5. MVB fiber configuration

Figure 6. Static frequency converter   Traction power and grid power quality

As shown in Figure 7. TSC and TCR work at high voltage and high current and turn on/off. This generates a very high electromagnetic field, which induces electromagnetic noise into nearby copper wires. Fiber optic cables are the best medium for sending control signals to the equipment in the SVC system because they are not affected by electromagnetic fields.

Figure 7

Frequency converter for grid train.

Table 2 lists some Avago parts used in power generation and distribution networks.

Jinzhi Optoelectronics can provide corresponding technical knowledge and related products:

1：Avago Fiber optic patch cord

2：Fiber optic connector

3：Fiber optic cable

4：Fiber Transceiver

5: Supporting tools and fixtures

For more products, please call the toll-free hotline: 400-160-8187 E-mail: sales@kinz-pof.com Website: www.kinz-pof.com