Research On Fault Line Selection Platform For Small Current Grounding Fault Based On LabVIEW

The small current grounding system is widely used in the distribution network in China.Although the single phase grounding fault in the small current grounding system is still allowed to run for a period of time,it will still cause serious consequences if the fault can not be processed in time,resulting in huge loss.At present,there are a wide variety of fault line selection devices for small current grounding fault,but the existing device platform still exists the defects of the line selection accuracy that can not meet the demand,the development program is complex and the function first is single.In order to solve this problem,this paper uses the LabVIEW software which has powerful signal processing function and extended function.It designs and develops a set of small current grounding fault line selection platform which uses the improved criterion fusion line selection method and has many functions of remote control,data storage and reading,and uses LabVIEW.The powerful expansion function will design the complete line selection platform to generate the.SETUP installer,and it can still run in the LabVIEW free environment.According to the above ideas,the following works are done in this paper:(1)To study the principle of the existing line selection method for the small current grounding system,provide a theoretical basis for the design of the line selection platform,study the development of the fault line selection device for the current grounding fault,and analyze the feasibility and significance of the research and development of the platform.(2)On the basis of fully learning the existing line selection principle and the fusion method of the criterion,the improved criterion fusion method is designed to classify the single phase grounding fault in the small current grounding system,then determine the use of one or several line selection methods,and then the line selection of these line selection methods,aiming at ensuring the basis of the accuracy of the line selection.It reduces the amount of computation and the complexity of programs,so as to improve the speed of routing platform.This part provides the design ideas and theoretical support for the selected part of the platform.(3)Analyze the function and characteristics of LabVIEW software,combine the characteristics of grounding fault line selection with small current fault,and give full play to LabVIEW advantage.Using the rich function selection board provided by LabVIEW software,the simulation program is divided into modules,and the development of the software platform is completed,and the line selection function of the line selection platform is realized.At the same time,we should give full play to the powerful function of LabVIEW,expand the function of the route selection platform.It has the functions of remote control,data access,and installation program.It also makes the platform not only meet the requirements of laboratory research environment,but also can be applied to the actual device.(4)Test the functions of the platform and analyze the selected data.Verify whether the result of platform alignment is accurate,and whether the function is complete.At present,there are few researches on the application of LabVIEW in small current wiring selection line,but the features of LabVIEW software are simple and intuitive,rich in hardware and software interface and easy to update the program,so it has unique advantages in the field of research.In this paper,based on the LabVIEW development of small current grounding fault line selection platform,on the one hand,try to update the line selection method;on the other hand,we hope to improve the functional diversity of the line selection device.