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着重分析计算了当发电机中性点采用高阻接地方式时的非金属性接地故障。建议在工频耐压水平允许的条件下,采用Xn/Rn=0.58来选择中性点接地电阻值,以使故障点的最大可能发热功率降低至最小值。并建议国产发电机提高工频耐压水平,重点开发能准确监测绕组绝缘、反应非金属性接地故障的继电保护装置。
The analysis and calculation of non-metallic ground fault when the neutral point of the generator adopts the high-resistance grounding mode are analyzed emphatically. It is recommended to select the neutral point grounding resistance value with Xn / Rn = 0.58 under the condition that the power frequency withstand voltage level is allowed, so as to reduce the maximum possible heating power of the fault point to the minimum value. It is also suggested that domestic generators should raise the withstand voltage of power frequency and focus on the development of relay protection devices that can accurately monitor the winding insulation and react to non-metallic ground faults.