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真空断路器额定开断短路电流的选择与计算?

人气:187 日期:2019-08-09 17:13:44

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欧洲杯高清直播  XIAMIANWOMENJIULAILEJIEYIXIASHENMESHIEDINGKAIDUANDUANLUDIANLIU?

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额定开断电流:它是表征断路器开断能力的参数。在额定电压下,断路器能保证可靠开断的最大电流,称为额定开断电流,其单位用断路器触头分离瞬间短路电流周期分量有效值的千安数表示。当断路器在低于其额定电压的电网中工作时,其开断电流可以增大。但受灭弧室机械强度的限制,开断电流有一最大值,称为极限开断电流。额定短路开断电流:是指开关极限断开电流的最大能力。

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NEIMERUHELAIZHENGQUEJISUANCHUEDINGKAIDUANDUANLUDIANLIULAINI?

根据线径与线路长度(总线阻)和变压器功率来进行选择,如果线阻较大时以线阻为主。若开关离变压器比较近,总线阻小,那么就不考虑线组,而是考虑变压器定容量来计算。而线阻是必须根据现场的实际情况来计数的。所以我们设计线路时都会计数好额定开断短路电流。