Pollution flashover accident of insulators may threaten the operation safety of power system, whereas, the research on pollution flashover circuit model is based on the plate model by now.

绝缘子污秽闪络事故严重威胁电力系统的安全可靠运行，目前国内外对污闪机理的研究主要以平板模型为基础。

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For decreasing the probability of harmonic instability and guaranteeing the safety and stability of HVDC's operation, it is necessary to research the harmonic instability deeply.

为减小谐波不稳定发生的概率，保证直流系统运行的安全、稳定性，对谐波不稳定现象进行深入研究是十分必要的。

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The research is important to find out faults in insulation system for cable in time and ensure operation safety of electric power system.

本课题的研究对及时发现电力电缆绝缘缺陷，保证电力系统的安全运行具有重要意义。

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