Study On Application Of Fiber Polarization Effect In 10kV Cable External Force Damage Monitoring And Early Warning System

With the continuous development of society,the proportion of power cables in the distribution system is growing,but the municipal road construction,user housing construction,gas pipeline construction,cable theft,etc.,often damage the operation of the cable,seriously affecting the cable safe and reliable The power supply advantage.Therefore,as the power operation management departments need to solve the cable power supply by external damage to ensure the safe and reliable operation of the cable.In this thesis,based on optical fiber polarization index to study the effect of cable monitoring characteristics,carried out on 10 kV distribution network cable damage from outside force of the realization of the monitoring and early warning system and related software research and development.When the optical force is caused by the external force,the polarization effect of this section of the fiber will be changed,which will cause the polarization of the reflected light to change.By detecting this change,you can know the location and nature of external damage.Through the polarized time-domain reflectometer technology to automatically monitor the polarization of the optical fiber changes and the location of the extraction of information such as the system to reverse the occurrence of optical fiber deformation of the location,time,deformation and other information to carry out the alarm.At the same time,through the design of effective optical fiber laying method and logic judgment algorithm,based on the geographic information system(GIS)calibration method,can quickly and accurately by the external damage to the cable positioning.Through the research,the optical fiber polarization effect technology is applied to the monitoring and early warning of external damage of 10 kV cable in distribution network,and it can solve the principle of optical fiber interference,grating and so on without changing the grounding mode of underground cable and not affected by harsh environment and on-site power supply Can not solve the problem of high false positives.To achieve when the cable by external damage to the timely alarm,rapid positioning of the location of external damage,so that power distribution operations personnel to detect and deal with problems in time to avoid line failure caused by power outages,effectively improve the reliability of power supply to ensure that social production,people's lives of the normal electricity.