Research On The Precise Location Method Of Optical Cable Line Fault Based On VR-GIS

With the strategy of building ubiquitous power Internet of things proposed by State Grid,power cable communication will play an important role in the construction of ubiquitous power Internet of things with its advantages of large capacity,low loss and high speed.Because the power cable communication carries a great amount of information and it is difficult to repair the optical cable fault point,if the optical cable line fails,it will bring immeasurable economic loss to the power enterprise.The existing optical cable monitoring method uses OTDR to detect the faulty optical cable line,only to get the straight-line distance between the optical cable fault point location and the detection point location,without geographic location Setting attributes;Due to practical engineering problems such as the way of laying optical cable,cable routing,cable reservation,etc.,the straight-line distance of optical cable fault cannot match the actual geographical location of the optical cable fault point;How to effectively monitor the working status of optical cable lines,realize the positioning of optical cable fault points,accurately display the actual geographical location of optical cable using VR-GIS,and shorten the time of optical cable fault has become an important topic.This paper mainly studies the precise location method of optical cable fault based on VR-GIS.Aiming at the problem of precise location of the actual geographical location of power optical cable fault,this paper does the following work:(1)Optical fiber cable fault pattern recognition method based on OTDR curve analysis.OTDR,as the main device of monitoring optical cable line,the accuracy of the distance between the optical cable fault point and the monitoring point obtained from the detection curve,to a certain extent,affects the accuracy of the optical cable fault location method based on VR-GIS to the actual location of the optical cable fault.In this paper,OTDR curve is decomposed by wavelet packet in time and frequency domain,and normalized wavelet packet energy is extracted as feature vector of optical cable fault mode.Finally,support vector machine model based on particle swarm optimization is established to train and test the feature vector to realize fault mode recognition.The experimental results show that the correct resolution of this method is 98.89%.Compared with the traditional support vector machine method,the accuracy is improved by32.22%,and compared with RBF neural network method,the accuracy is improved by 0.56%.(2)The virtual power cable line information based on VR-GIS is constructed.The construction of virtual power cable line information based on VR-GIS is the foundation of realizing the accurate location method of power cable fault,the virtual power cable line information contains the actual geographic location information of the tested cable line,and the calculation and display of the actual geographical location of cable fault can be realized by virtue of the powerful data analysis and spatial positioning ability of VR-GIS.In view of a certain optical cable line in Changchun area of State Grid Jilin Electric Power Co.,Ltd.,through the use of 3DMAX and Super Map.Net Software construction of virtual power cable line information based on VR-GIS;reuse Super Map.Net Powerful data analysis ability integrates multiple data into three-dimensional virtual optical cable line,so that it has the location information of the tested optical cable line;finally,through Super Map object.Net and Microsoft Visual Studio 2010 to realize the secondary development of Super Map and the construction of virtual power cable line information based on VR-GIS.(3)Based on VR-GIS,the precise location method of optical cable fault.This method is based on the VR-GIS based virtual power cable line information construction and OTDR curve analysis based optical cable fault pattern recognition method.In this method,the information of each special location point in the tested optical cable line is stored in the VR-GIS database,the actual measured distance is compared with the special location information stored in the database,and the actual geographical location range of the fault point is continuously analyzed iteratively,and finally the longitude and latitude of the actual geographical location of the fault point are obtained.VR-GIS displays the actual geographic location information of the fault point according to the longitude and latitude of the actual geographical location of the fault point.Experiments show that the accuracy of the method can be controlled within 15 meters,and the positioning speed only needs 5.9 seconds,which improves the speed of the cable maintenance personnel to determine the actual location of the cable fault and the visualization of the operation and maintenance of the cable.