Active positioning method for grounding hazards under OPGW optical cable in substations based on filtering

If the grounding of OPGW optical cable in the substation entrance section is not complete, the tracking signal positioning and fault point section positioning do not match, which affects the reflection effect of observation data on node status, resulting in low accuracy and efficiency of grounding hazard positioning. Therefore, a filtering based active positioning method for grounding hazards under OPGW optical cable in substations is proposed. Using wavelet threshold denoising to preprocess the grounding hazard fault signal of OPGW optical cable in the substation. Using signal technology, identify the grounding hazard fault lines under the OPGW optical cable in the substation, normalize the phase currents of the grounding hazard fault lines, and extract the characteristics of the grounding hazard fault lines under the OPGW optical cable in the substation. Based on the robust filtering algorithm, observation data of grounding hazard fault nodes are received, and a state space model of grounding hazard fault nodes based on adaptive robust filtering is constructed to expand the reflection effect of observation data on node status. By dynamically adjusting the filtering parameters, active positioning of grounding hazards under OPGW optical cables in substations is achieved. The experimental results show that the proposed method has a good denoising effect on the fault signals of grounding hazards under the OPGW optical cable in substations, and can effectively improve the accuracy and efficiency of active positioning of grounding hazards under the OPGW optical cable in substations.