To meet the complex electromagnetic environmental conditions of power transformer on-site, an optimization algorithm of the closing time based on fuzzy reasoning is proposed. It can not only improve the robustness and stability of inrush current's inhibition of algorithm, but also can be a theoretical basis for the research of transformer inrush current restraining method. Power transformer is a major electrical equipment in power plants and substations, for whether it can function properly or not directly influences the continuity and stability of the power system running. But the transformer protection in the power system sometimes functions improperly, and inrush current is a main cause to trigger the malfunction of the transformer differential protection. To avoid the maloperation of transformer differential protection, a long-time research of the mechanism of inrush current's occuring has been conducted. The study results in two research directions, one is to avoid the protection misoperation when inrush current occurs, the other is to supress the inrush current. Directed to the inhibition of inrush current, this article proposes an optimization algorithm of the closing time based on fuzzy reasoning, which can meet the complex electromagnetic environmental conditions of power transformer on-site. This fuzzy reasoning has strong robustness and adaptability because it is an inference method which is out of human beings' thoughts, and it gives full consideration to the human thinkings' fuzziness and randomness.
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