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- W4376465621 abstract "In a ±800kV VSC-UHVDC transmission project, due to the uneven voltage distribution of multi-layer metal box-type preinsertion resistance, several breakdown and flashover faults occurred in type and debugging tests. The paper studies the overvoltage characteristic of two types of multi-layer metal box-type resistances. Firstly, for A-type pre-insertion resistance, the voltage distribution without stray capacitance is preliminarily analyzed based on PSCAD. The preliminary analysis shows that the recommended voltage non-uniformity coefficient for VSC-UHVDC pre-insertion resistance is 1.3, and the optimization method for A-type is proposed. Then, the difference of B-type is analyzed on the basis of the research on A-type. The electrostatic field solver is used to calculate B-type stray capacitance, and the PSCAD circuit model with stray capacitance is built. The uneven voltage distribution is obtained by simulation calculations and experiments. The results show that the terminal voltage of resistance unit is significantly higher than the average voltage, and withstand voltage reference values of the mica rod and the wall bushing are also calculated. Based on practical engineering problems, this paper combines theoretical calculations with simulations and experiments. The research results can provide some research directions and data references for the insulation optimization design of VSC-UHVDC pre-insertion resistance." @default.
- W4376465621 created "2023-05-14" @default.
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- W4376465621 date "2022-01-01" @default.
- W4376465621 modified "2023-10-18" @default.
- W4376465621 title "Optimization design of multi-layer metal box-type pre-insertion resistance for VSCUHVDC" @default.
- W4376465621 doi "https://doi.org/10.1049/icp.2023.0192" @default.
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