Research On Remote Communications And Simultaneous Measurement Technology In Online Monitoring

The power cable is one part of the basic power system,which reliability running affects the safe operation of the entire system.A large number of domestic and foreign scholars study performance of the power cable insulation,and propose a variety of monitoring tools.This paper discusses the problem of long-distance power cable insulation monitoring designing power cable insulation monitoring system based on GPS,GPRS technology.The system can effectively solve the problem of long-distance power cables,which is high running voltage,long distance and laying complex environment etc,and can correct and accurate monitoring of the performance of the insulation of the power cable,so as to provide the basis for the judgment for the cable staff of the cable run state.First of all,the paper narrates the background and significance of power cable insulation online monitoring,and several commonly power cable insulation on-line monitoring methods which are used at home and abroad are analysed in detail,and then the paper sums up a method based on GPS,GPRS technology.At the same time,this paper introduces the wireless communication technology briefly and compares some timing service methods.Secondly,this paper does a brief description about GPS,and describes the GPS synchronization timing service function and the method of the synchronous data sampling in detail.According to using the absolute time synchronous sampling method,this paper designs synchronous sampling waveform program which could sample the both ends of the cable data synchronously.According to analysing the GPRS wireless communication technology,the paper introduces the theory and the method of wireless communication,configuration commands of GPRS module and several key technical problems in the process of the GPRS wireless communication such as dynamic IP in detail.Finally,the overall program of insulation monitoring system for long distance power cable of the GPS based synchronous acquisition with high precision for off-site data in the program was simulated and tested.Moreover,the GPRS based wireless transimission from point to point for off-site data was tested.