Analysis Of Temperature Characteristics And Transmission Loss Of Optical Fiber Composite Low Voltage Cables

The optical fiber composite low-voltage cable is a composite cable,referred to as OPLC(Optical Fiber Composite Low-Voltage C able),which combines a light unit and a low-voltage power cable to have both an electrical information transmission function and an optical communication transmission function.One of the requirements for the development of smart grid is power fiber to the home,the realization of power fiber to the home needs to rely on fiber optic composite low voltage cable,that is.in the low voltage communication access network,when laying low voltage power lines,the fibers are combined to realize power consulption inforlation.Collection,intelligent power two-way interaction,multi-network convergence and other services,so as to achieve the table to the home.OPLC can simultaneously solve the power problem in the field of electricity and the fiber-optic communication problem in broadband access,and can promote the "last mile" of the optical access network to achieve better.OPLC is a very important product in the construction of smart grid user access terminals,and its operation is crucial for the safe operation of the entire power grid.The basis for the normal operation of OPLC is to work within the range of internal material temperature resistance and transmission loss.Due to the many factors affecting the temperature of the OPLC cable,in order to ensure the safe and effective operation of the OPLC cable,it is of great engineering practical significance to accurately simulate the temperature distribution of the underground OPLC cable by numerical calculation method;the transmission loss of the optical fiber directly affects the transmission distance or the interval of the relay station.The distance is far and wide.Therefore,studying the optical transmission loss characteristics of OPLC is of great significance in determining the transmission distance,transmission stability and reliability of optical networks.In order to analyze the temperature characteristics and transmission loss of fiber composite low-voltage cable,this paper uses the idea of finite element to establish OPLC simulation model using COMSOL Multiphysics software,simulates the normal working state,short-circuit fault and different parameters of OPLC.and obtains the internal temperature distribution.Happening.Because the short circuit fault is very harmful to the normal operation of OPLC,in order to monitor the current in real time,the temperature measuring fiber is placed inside the OPLC,and the R-OTDR(Raman scattered light time domain reflectometer)can realize the rapid and distributed measurement of temperature,according to The current temperature curve enables monitoring of the current.The scheme of symmetric placement of temperature-measuring fiber is proposed by the temperature variation of different characteristic points during OPLC short-circuit fault,which provides a theoretical basis for the implementation of R-OTDR to measure the temperature of OPLC cable.The change of temperature causes the fiber deformation to finally affect the fiber transmission loss,so as to analyze the influencing factors affecting the fiber transmission loss.