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文章通过案例进行TN系统、TT系统短路电流计算和数据分析,探讨220/380V配电线路的保护设置、保护电器参数整定和配电线路的热稳定校验。“,”Through the case of TN system、TT system short-circuit current calculation and data analysis,the article discusses the distribution circuitry of 220/380V protection setting、protect electrical distribution circuit parameter setting and thermal stability of