Abstract
Data fusion with different types of data that used for grid fault location can bring more accurate and clear results. Therefore, a new method for fault location which contains multi grid current and voltage, time and coordinate data information is proposed. Transient traveling wave is analyzed for determine the required data information in the first place, and then affirm the positioning principle and the selection rules of positioning network according to characteristics of multi fault traveling wave. Finally, Grid fault location will be precisely positioned by applying multiple data grid fault location algorithm. Simulation results shows that the proposed method is feasible, and the new algorithm has higher positioning accuracy.
Highlights
The existing fault location system adopts traveling wave information generally
The terminal which traveling wave arrival time is the second will be add to location network, and determine the current traveling wave polarity, if the polarity is contrary to terminal ‘0’, this terminal will be treated as ‘major auxiliary terminal’, and will be numbered ‘1’
Take ‘S5’as an example, the transient forward traveling wave is subjected to 6 different scales of wavelet transform, as shown in Fig.A2, there is a maximum modulus point at 80ns, and its Lipschitz index is zero, so 80ns is treated as the arrival time of terminal ‘0’
Summary
The existing fault location system adopts traveling wave information generally. For single-terminal location, the information that needs to be identified include first arrival time of fault wave, arrival time of reflected wave from fault point and arrival time of reflected wave from opposite end bus etc. Double-terminal location only needs to identify the first arrival time of fault wave form two terminal, it is easy to implement machine analysis and automation. Double-terminal location needs synchronization at both ends of the fault line. References [6] proposed a traveling wave fault location method based on the multi measuring points. Setting a main terminal in a fixed position is necessary under any existing fault location system, other terminals transmit data to the main terminal. The result of fault location is length between main terminal and fault position. The result of fault location is in the form of plane coordinates, for the maintenance personnel, plane coordinates is a definite location information
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