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1 Protection and control devices Fault types and currents Overload Operating conditions in an electrically undamaged circuit which cause an over-current. Short-circuit The accidental or intentional connection, by a relatively low resistance or impedance, of two or more points in a circuit which are normally at different voltages. Residual current (I?) It is the vectorial sum of the currents flowing in the main circuit of the circuitbreaker. Rated performances Voltages and frequencies Rated operational voltage (Ue ) A rated operational voltage of an equipment is a value of voltage which, combined with a rated operational current, determines the application of the equipment and to which the relevant tests and the utilization categories are referred to. Rated insulation voltage (Ui ) The rated insulation voltage of an equipment is the value of voltage to which dielectric tests voltage and creepage distances are referred. In no case the maximum value of the rated operational voltage shall exceed that of the rated insulation voltage. Rated impulse withstand voltage (Uimp ) The peak value of an impulse voltage of prescribed form and polarity which the equipment is capable of withstanding without failure under specified conditions of test and to which the values of the clearances are referred. Rated frequency The supply frequency for which an equipment is designed and to which the other characteristic values correspond. Currents Rated uninterrupted current (In ) The rated uninterrupted current for a circuit-breaker is a value of current, that the circuit-breaker can carry during uninterrupted service. Rated residual operating current (I?n ) It is the r.m.s. value of a sinusoidal residual operating current assigned to the CBR by the manufacturer, at which the CBR shall operate under specified conditions.
1.保護(hù)和控制裝置
故障類型和電流
超載
電氣未損壞電路中的工作條件會(huì)導(dǎo)致
過流。
短路
由相對(duì)較低的電阻或電阻引起的意外或有意連接
阻抗，指電路中通常處于不同位置的兩個(gè)或多個(gè)點(diǎn)的阻抗
電壓。
剩余電流（I?)
它是流經(jīng)斷路器主電路的電流矢量和。
額定性能
電壓和頻率
額定工作電壓（Ue）
設(shè)備的額定工作電壓是一個(gè)電壓值，它與額定工作電流相結(jié)合，決定了設(shè)備的應(yīng)用
以及相關(guān)測試和使用類別。
額定絕緣電壓（Ui）
設(shè)備的額定絕緣電壓是指設(shè)備所承受的電壓值
介電測試參考電壓和爬電距離。在任何情況下
額定工作電壓的大值應(yīng)超過額定工作電壓的大值
絕緣電壓。
額定沖擊耐受電壓（Uimp）
規(guī)定形式和極性的脈沖電壓的峰值
設(shè)備能夠在規(guī)定的條件下耐受而不發(fā)生故障
以及參考間隙值的試驗(yàn)。
額定頻率
設(shè)備設(shè)計(jì)的供電頻率，以及
其他特征值對(duì)應(yīng)。
洋流
額定不間斷電流（In）
斷路器的額定不間斷電流是一個(gè)電流值
斷路器可在不間斷運(yùn)行期間進(jìn)行操作。
額定剩余工作電流（I?n）
它是分配給控制器的正弦剩余工作電流的r.m.s.值
CBR由制造商提供，CBR應(yīng)在規(guī)定條件下運(yùn)行
條件
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