Study On Fault Distance Measurement Methods In 10kV Automatic Blocking And Continous Transmission Lines

Railway automatic blocking and continuous transmission lines (RABCL) supply power for the railway automatic blocking signal and the loads along the lines, etc. In order to insure transportation safety, high reliability of the power supply system and quick elimination of fault is required. Every blackout, even shutting off for a short time, would have led to automatic blocking signal confusion, and interrupted the railway transportation, even caused serious life and property loss. So in order to avoid accidents, and to make the distribution network run safely, reliably and economically, fault point must be found and be eliminated as quickly as possible. Fault distance measurement and location directly provide information related to fault point, it is convenient for fault elimination. With the requirement of improving the reliability of power supply and the automation level, the fault distance measurement and fault location become more and more important.On the basis of studying the characteristics of RABCL and the present research situation of its fault location, and analyzing the theories of some kinds of fault distance measurement/location methods, the adaptation of these methods is analyzed when they are applied into RABCL.The model of RABCL based on PSCAD/EMTDC is built in this thesis, some simulations are carried out to show the fault characteristics and the difficulty in realizing fault distance measurement/location when single phase to ground fault occur. The simulation results are the same as theoretical results, it means the simulation model can reflect system characteristic factually.Impedance method is introduced to RABCL, simulations are carried out when single phase to ground fault occur with variable fault impedance. In order to reduce the influence of fault impedance and line...