With the characteristics of reliability and high efficiency, optical fiber communication is widely used in power industry, and plays an important role in relay protection, monitoring and dispatching, automation and so on. The application of optical fiber communication technology in power system dispatching automation is briefly described.
Optical fiber communication technology; Power system dispatching; App application
The application of optical fiber technology in electric power enterprises has played a great role in the management level of enterprises. Compared with other technologies, optical fiber communication has unique advantages. This technology uses optical fiber as the transmission medium and uses light to transmit information. Optical fiber communication technology consists of the following parts: terminal, repeater, optical cable and optical turbulator. This technology is very flexible in application, which can be star, mesh or chain. The power dispatching automation usually applies ring network, which can be connected to computer local area network to achieve the purpose of data sharing.
1 optical fiber communication
Optical fiber communication takes light as the carrier and optical fiber as the transmission medium to realize information transmission. The composition of optical fiber includes core, cladding and coating. The inner core is between several microns and tens of microns, which is thinner than hair. The middle layer is called cladding, and the fiber core completes signal transmission. The cladding and the fiber core have different refractive indexes, which enclose the optical signal in the fiber core for transmission and protect the fiber core. The function of the coating is to protect the optical fiber. The communication principle of optical fiber is to change the information to be transmitted into an electrical signal at the transmitting end, and then modulate it into a beam emitted by a laser. The intensity of light will change with the change of signal amplitude and be sent through optical fiber. On the other hand, at the receiving end, the optical signal is received by the detector and becomes an electrical signal, and the electrical signal is recovered to the original signal state by demodulation. The technical components of optical fiber communication include signal transmission, signal multiplexing, signal amplification and transmission, signal reception and signal separation.
2 characteristics of optical fiber communication technology
The characteristics of optical fiber communication technology are reflected in the following aspects: firstly, the transmission capacity is large, and the transmission bandwidth and modulation mode are the factors that make optical fiber communication technology have transmission capacity. Light source has modulation characteristics, and its communication capacity is much larger than that of cable and copper wire. Other measures can be taken to minimize the loss of information during transmission, thus avoiding the limitation caused by information capacity. Optical fiber communication has strong anti-interference ability. The main component of optical fiber material is timely and has good insulation effect, so optical fiber has good anti-interference ability. The timely material has relatively stable performance, strong corrosion resistance and good insulation effect, and can resist lightning interference and sunspot activity. The interference of artificial electromagnetism can also be weakened. In the specific construction process, if optical fibers are erected in parallel and high-voltage lines are erected in parallel, composite optical cables can be formed, which can support the development of power dispatching automation and effectively reduce the influence of electromagnetic pulses on communication. Good safety performance. In the process of radio wave transmission, electromagnetic wave leakage is inevitable, which will reduce the security of the signal and even lead to signal theft in serious cases. Using optical fiber technology, information can be confined to light. Even if there is leakage, the outer sheath of optical fiber can absorb the signal, thus preventing the outside world from stealing the signal. However, in the actual construction process, the same optical cable may be wound with different numbers of optical fibers, and there will be no information interference between them due to the outer sheath of optical fibers. Compared with the existing transmission media, optical fiber has the lowest loss, so it is more reasonable to use optical fiber in long-distance transmission. With the development of social economy, people's requirements for information transmission are getting higher and higher, and the distance of information transmission is getting bigger and bigger, which will lead to the increase of transmission loss, and reducing loss becomes a very important work in the process of information transmission.
Application of optical fiber transmission in power dispatching automation
The power system consists of distribution system, power transmission and transformation system and power plant. For the communication system, the smooth transmission of information is the key to ensure the effective operation of the system, so optical fiber technology plays an increasingly important role in the power system. The networking mode of optical fiber communication is very flexible, which can be divided into star, tree, mesh and ring. Considering the characteristics of power dispatching automation, it is usually a combination of tree and ring, or a simple ring network, which realizes data sharing by connecting computers. There are many nodes in the communication network. In order to avoid communication interruption and other faults in the work process, enterprises can consider adopting a self-healing network with double optical fiber rings, in which an optical fiber transceiver with automatic switching function is configured. Once there is a problem in optical fiber communication, the switch can form a new optical fiber path in time, so as to realize the self-healing of the communication system and ensure the normal operation of relay and power dispatching. Application of optical fiber communication technology in power dispatching automation. Due to the particularity of the power supply department, the reliable operation of the power grid is required, and the requirements for relay protection are getting higher and higher. When there is a problem in the power system, the staff need to determine the location and cause of the fault in time and accurately, and solve the problem quickly, so as to control the influence of the system fault within a certain range. For the remote control of dispatching side, there should be no abnormal refusal, and the stability of optical fiber communication directly affects the stability of power grid operation. Optical fiber system has large communication capacity and strong anti-interference ability, which provides strong support for the normal development of power dispatching. The construction of power dispatching automation is not only reflected in the automatic transmission of information, but also needs the assistance of other systems to achieve the goal of dispatching automation. Other auxiliary systems include: video monitoring, dispatching telephone, five prevention systems, etc. The function of optical fiber communication is to make related systems run normally and effectively, so if optical fiber communication does not participate in system construction, the effect of power dispatching automation will be greatly affected.
4 the development prospect of optical fiber technology applied to power dispatching automation
With the development of social economy in China, the application scope of optical fiber technology is gradually expanding. The application of optical fiber technology in power system is the trend of social development. Signals are transmitted in an intelligent way, and metal cables are replaced by optical fibers as a new medium for information transmission, thus forming a secondary communication system, which will become the development trend of power systems. The development of digital technology is the basis of the development of power dispatching system, and the automation system needs to realize the digitalization of information transmission, which poses a challenge to optical fiber communication technology. The development of optical fiber technology needs to change constantly with the changes of society, so as to better meet the needs of social development and make it develop normally when applied to power dispatching automation system. It is necessary to strengthen scientific research on important technical difficulties in application, so that the system can be continuously improved in the application process. In the development process, the electric power dispatching system develops towards automation and intelligence, which reduces the labor intensity of workers and improves the work safety. The application of dispatching automation system can further optimize the existing distribution network, thus improving the reliability and quality of power supply. As a communication transmission medium with stable performance, when using optical fiber in power dispatching system, workers need to combine the characteristics of power enterprises and optical fiber to make all parts of power dispatching work effectively and ensure that power communication can be more effective and safe. With the development of power communication technology in China, the application of optical fiber technology in power communication system will also play a greater role.
5 concluding remarks
The development of power dispatching to automation is the trend of power grid development. In the automation system, optical fiber communication has obvious advantages such as strong anti-interference ability, good confidentiality, low loss and large communication capacity, which can improve the efficiency of electric power work. On the other hand, the scale of power enterprises is constantly expanding, and new technologies are applied to power grid operation. The application of optical fiber technology in power enterprises will also face challenges from some aspects, requiring staff to constantly optimize in the process of technology application.
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