Small current grounding fault line selection method based on generalized S transformation transient energy
A small current grounding, transient energy technology, applied in the direction of measuring electricity, fault location, measuring electrical variables, etc., can solve the problem of single-phase grounding faults that are difficult to solve effectively, unstable intermittent arc faults, fault steady state signals Weak and other problems, to achieve the effect of solving the problem of fault location, high time-frequency analysis capability, and good fault location.
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[0039] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.
[0040] At present, the city's distribution network mainly adopts the line structure of mixed connection of buried cables and overhead lines. Taking Jiangsu Power Grid as an example, the pure overhead distribution lines have gradually decreased, accompanied by the addition of a large number of cable lines, resulting in capacitance The continuous increase of current will inevitably have a great impact on the transient process of small current ground faults in the distribution network. The main impact is that the capacitive current level of the cable line is significantly higher than that of the overhead line, and the noise interference of the cable line is also significantly stronger than that of the overhead line. ...
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