Catenary Short-circuit Transient Simulation And Development Of Traveling Wave Fault Location Device

Catenary is an important component of the electric traction power supply system. For catenary is set up along the line and without backup, it is a rather weak-link of electric traction. Catenary breakdown will result in great losses to railway transport. For the traditional impedance fault location method is sensitive by transition resistance and the accuracy of fault location is low, so the research on traveling wave fault location of catenary is become very important.The paper discussed the research on the power system traveling wave transmission line fault location at home and abroad. Combining with the characteristics of electric railway catenary fault, as to the backdrop of the actual test of Beijing-Tianjin inter-city railway, this paper used A-type traveling wave fault location method as the main methods, and supplemented by B-type traveling wave fault location and C-type traveling wave fault location, which need further development.This paper systematically studied the wave equation of the transmission line grounded fault, phase mode transform, fault transient traveling wave propagation, wavelet analysis basic theory and singular signal detection theory. Using electromagnetic transient simulation software ATPDraw to build the catenary simulation model of Beijing-Tianjin inter-city railway, the model of no-load operation, the short-circuit fault is break at the end of line was built. The current travelling wave signal was got and compared to the actual current signal which measured in short-circuit experiment of Beijing-Tianjin inter-city railway in 2008.6. The correctness of the model was fully verified. At the same time, different simulation models which work under different fault location, load operation were built and the current travelling wave signal was got.In this paper, the travelling wave fault location device was developed. In the software, the 3-scale wavelet transform program based on A-type traveling wave fault location was developed by C language. The current travelling wave signal was processed by the program and fault location information was calculated. The main program of catenary fault location was developed, which included line initialization program, line start discrimination program, A/D interrupt and data saving program, and CAN communication program between DSP control board and ARM control board. The core hardware design of the device can be divided into two parts: DSP control board and ARM control board. In addition, power module, LCD panel display module, device box were designed. Hardware circuit design, schematic and PCB drawing, board making and debug of DSP control board and ARM control board were hold in this paper.Finally, the device was verified by using the actual recorded data of Beijing-Tianjin inter-city railway short-circuit experiment. The result had shown that the travelling wave fault location device can achieve the fault location accurately.