In sandstorm condition, sand particles with different size collide with each other, resulting in electrification of sand particles and a strong electric field will form. When the charged sand particles move to the neighborhood of line insulators, they will impact the external insulation performance of line insulators. In this paper, electric field distribution of composite insulators with the existence of charged sand particles is calculated by means of finite element method. The result indicates that charged sand particles distort the electric field distribution around insulators obviously; the degree of aberration varies with the amount of charge that the sand particles take; when charged sand particles suspend on the surface of sheds or sheaths, these parts will bear very high field stress; when the charge-to-mass ratio of charged sand particles reaches a certain extent, corona discharge will happen in the ambient air, this will accelerate the ageing of composite insulators.

Abstract.Helicopter-based LiDAR system due to high input cost and personal risk resulting in a certain restrictions on overhead power lines. With the developed application of UAV platform for power lines surveys and miniaturization of LiDAR device, the integration of UAV-based LiDAR system comes to maturity and compensate for the lack of Helicopter platform. Unmanned helicopter based LiDAR system acquire high accuracy 3D point cloud to reconstruct the model of power lines and the dangerous point detection etc. In this article, the UAV-based LiDAR system utilizes the Dragon-50 unmanned helicopter, made in Switzerland, and GL-70 equipment, made in America. This system was used to survey the Shandong Zouchuan power line with 500kV, acquired LiDAR point cloud successfully and met the expectation. The unmanned airborne LiDAR system provides a reference for the promotion of power inspection applications.

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In this paper, the finite element method is used to calculate the three-dimensional electric-field distribution of long-rod post porcelain insulators used in 1000kv system. The electric-field distribution is simulated in the condition of varied position, varied major radius and varied section dimension of the shielding ring. The effect of these factors to the external insulation characteristics of post porcelain insulators is analyzed. The electric-field distribution at the line side and the grounding flange can be effectively improved by proper distribution of shielding ring and the optimization of the shielding ring structure. This provide calculation gist to improve the characteristics of shielding ring used in 1000kv long-rod post porcelain insulators and the reliability of safe operation in 1000kv system.

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