Energy ratio based on the full Zhou Bo single phase grounding fault recognition and Virtual Earth

The present invention relates to a single phase faulted with Virtual Earth recognition method based on the whole Zhou Bo energy ratio belongs to the technical field of power system protection. After extraction of the present invention after two Zhou Bo of a fault zero sequence voltage data, are subjected to the wavelet transform, the reconstructed coefficients squared wavelet transformed at each scale summing, obtaining the highest frequency energy value, the first Zhou Bo of the highest frequency energy value than the most high-frequency energy value of the second Zhou Bo, the identification of a grid with single phase faulted Virtual earth such that sets a threshold value in accordance with magnitude relation to reliably achieved. This principle of the method is simple, can be identified in a relatively short time Virtual Earth; robustness, without having an arc fault, the influence of nonlinear loads, etc., greatly reduce the hardware requirements of the sampling rate, there are strong practical sex.