Study Of Method On Location Of Transmission And Distributionline Line Fault To Baotou Region

Electric power line,which is the lifeblood of power grid operation,it in electric power transmission vulnerable again at the same time,any damage from outside force and staff mistake operation,is likely to cause blackouts,grid collapse,even to the social economy and people’s life bring great harm.At the same time,some of the early fault of transmission and distribution lines if not ruled out in time,is likely to become a short circuit fault,to cause harm to the safe operation of power system.Therefore,the study on power line online detection and diagnosis method,for timely troubleshooting,maintaining power system security has very important significance.The purpose of this thesis is to solve the problem of complex distribution network fault location.After the failure,can be directly points out that the fault location,fault location information,go to patrol or use the locator to find the specific point of failure,not blindly patrol positioning,can greatly reduce troubleshooting time,improve efficiency,improve power supply reliability.Thesis mainly USES the method of fast independent component analysis of distribution network fault traveling wave distance measuring,carrying out a research into the new measure.The main research contents have the following several aspects:1.The structure of the actual distribution circuit equivalent circuit diagram.After the analysis of line fault on the intrinsic characteristics of traveling wave and its online transmission characteristics.Power distribution line fault,the voltage signal with the circuit of transmission loss is bigger,so choose current signal analysis fault information can effectively realize the distance.2.The fault current signal is equivalent to the linear mathematical model by the method of independent component analysis.Through the kurtosis and negative entropy method of independent component of non-gaussian properties(Fast ICA)mixed signals and the fault current signal separation,separation negative entropy algorithm can reliable communication fault transient current signal.3.Using single channel range of fault location method can save cost,to establish the single channel Fast ICA ranging method based on negative entropy.Based on transient current signal mixed linear equivalent,negative entropy Fast ICA algorithm is utilized to extract contains electrical fault features popular wave signal.Judge fault electric popular Bob polarity are consistent and capture two most big Bob’s first time,using the method of single ended ranging formula for calculating distance.4.System simulation research methods.Matlab software to build a single busbar distribution circuit model of many branches,according to the single channel Fast ICA algorithm,a simulation to extract the fault wave headers,respectively on line containing different branches,fault location,the neutral point grounding method,simulation test and verify the feasibility of this method is accurate.By operation mode of fault point and different grounding fault location are simulated,the results show that single channel Fast I-CA ranging method are accurate and reliable,has good practical value.