Method and apparatus for single phase ground fault route selection of low-current grounding power network

The invention is a kind of one-way grounded failure selecting method and the device for a kind of small-current grounding electric network: at first, a 10kV physical simulating lab for the small-current grounding select is crated. The lab system discloses the essence of the running principle and the grounding failure of the small-current grounding electric network, it reappears some failures such as arc light grounding, intermittent arc light grounding, large-resistance grounding, and instable large-resistance grounding. And it researches the intelligent colony amplitude and phase comparing method, wavelet method, sample constructing method, current mutating method, network method which is suitable for each kind of grounding modes such as non-slip point grounding and non-slip point grounding through the arc eliminating coil; it provides the effective region analysis and the continuous judgment technology in the first; and it provides and uses the evidence theory, failure measuring theory, coarse group theory and several criteria intelligent fusion idea.