Research And Realization On Fault Location Of Transmission Line Based On Traveling Waves

The economic and reliable operation of power system requires a exact and fast determination of the point where a fault occurs. A method of quickly and accurately locating transmission line faults has been a much-desired tool for control center operators and the repair crews, and it is also an important research area in electrical engineering.Traveling wave is a mutation and singularity signal. The paper discuss the singularity detection theory of wavelet transform, this theory is applied to analysis of fault characteristics of the transient traveling waves.On this basis,a 'fault start element',a 'fault line select element'and 'fault phase select element'are proposed. The method utilizes sufficiently properties of wavelet transform, both in time domain and in frequency domain. As a result, the measured fault location using this method is more accurate and reliable.Traveling wave's frequency is more than hundreds thousand Hertz. General Single Chip Micyoco can't acquire the signal possibly.So a high-speed data sampling board is designed technically. In the section of data acquisition, the paper discusses a new high-speed data sampling board. Its sampling rate reaches five millions and the memory is two millions byte. This sampling board has GPS interface periphery assistant electrocircuit has been realized with complicated programmable logic device. The structure and function is discussed detailedly in chapter five.