研究目的
To investigate the impact of a gas discharge arrester's electrodes' shapes on its performance, focusing on reducing the electric-field strength at the edges of the electrodes to prevent reignition of the electric arc.
研究成果
The study concludes that the curvature of the upper side of the electrode has the strongest impact on the uniform distribution of electric-field strength. The optimal shape of the electrode with grid and hooked excrescence, though technologically difficult to produce, significantly reduces the risk of reigniting the electric arc. The results suggest that a more uniform distribution of electric-field strength can be achieved by geometrically reshaping the electrodes.
研究不足
The study focuses on the electric field in GDA without considering those properties of gas which affect the dielectric strength of the gas. The technological difficulty in producing the optimal shape of an electrode with grid and hooked excrescence is also a limitation.
1：Experimental Design and Method Selection:
The study uses the finite elements method (FEM) to compute the electric-field strength between the electrodes of existing gas discharge arresters. A differential evolution optimization algorithm is employed to compute more adequate shapes of electrodes for uniform electric-field distribution.
2：Sample Selection and Data Sources:
The study focuses on two types of gas discharge arresters (GDAs) available on the market, one with a smooth upper surface of electrodes and the other with a grid engraved on the upper surface.
3：List of Experimental Equipment and Materials:
The study utilizes the EleFAnT program package for FEM computations and the Matlab program package for the optimization algorithm.
4：Experimental Procedures and Operational Workflow:
The procedure involves developing a geometrical model of a GDA, meshing the model into finite elements, assigning electric potential and material properties, and computing the electric-field strength. The optimization algorithm is then used to find the optimal electrode shapes.
5：Data Analysis Methods:
The analysis involves comparing the computed electric-field strengths for various electrode shapes to determine the most uniform distribution.
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