Research On Transient Electromagnetic Geophysical Geophysical Signal Filtering Method In Mountainous Substation

In recent years, China’s power grid construction continue to speed, power is expanding. Many in southwest China plateau topography and geological conditions are very complex, large regional differences in climate and natural environment, to bring a lot of safe and stable operation substation hazards and risks. Mountain substation for the detection of the geological structure of the testing is an effective method of using the transient electromagnetic geophysical method. This approach has the advantage of fast and efficient, but surrounding electromagnetic interference substation there will be a strong, strong background noise disturbance this complex environment will be the second electric field information becomes relatively weak. Therefore, in this study a strong electromagnetic interference transient electromagnetic how to obtain useful information is important.Based on the above background, for electromagnetic interference nearby Mountain substation complex impact on the transient electromagnetic signals. This paper systematically analyzes the surrounding substation transient electromagnetic noise sources, characteristics and suppression method for transient electromagnetic method and evaluation method Denoising a study, the main contents are:(1)Electromagnetic Transients useful information extracted under strong interference conditions. By studying Substation transient ambient electromagnetic noise characteristics, the use of wavelet transform and Hilbert Huang TEM analysis of the data analysis, in order to solve the transient electromagnetic signal filtering process of adaptation and interpretation of the accuracy issue, wavelet-Hill transient electromagnetic signal algorithm Bert yellow combined, as measured data analysis method mountain substation.(2)Mountain Substation transient electromagnetic geophysical prospecting method experimental design. A mountain on the surrounding geological structure substation analysis, selection and substations in the same position as a measure of the landslide area, on-site data collected on-site inspection data, qualified as the original data signal analysis.(3)Transient electromagnetic signal analysis on the mountain substation. I used wavelet analysis, wavelet and Hilbert Huang Hilbert-Huang algorithm combined with three ways to collect signals de-noising, combined SNR, the filtering effect and time-frequency analysis of the three filtering methods to assess, and before and after de-noising normalization of V (t)/I measured channel graph comparison and analysis of their transient electromagnetic signal de-noising strong interference effect of the merits of the case.