标准摘要
[中文适用范围]： IEC 60909 的这一部分包含从不同国家收集的电气设备数据，必要时可根据 IEC 60909-0 计算短路电流。一般来说，电气设备的数据是由制造商在铭牌上或由电力供应商给出的。然而，在某些情况下，数据可能不可用。如果本报告中的数据符合用户所在国家/地区使用的典型设备，则可用于计算低压网络中的短路电流。收集的数据及其评估可用于中压或高压规划目的，也可用于与制造商或电力供应商提供的数据进行比较。对于架空线路和电缆，在某些情况下，电气数据也可以根据本报告中给出的方程从物理尺寸和材料计算得出。因此，本技术报告是对 IEC 60909-0 的补充。然而，它不会改变 IEC 60909-0 和 IEC 60909-3 中给出的标准化计算程序的基础。 [外文原描述]： IEC 60909-2:2008(E) comprises data of electrical equipment collected from different countries to be used when necessary for the calculation of short-circuit currents in accordance with IEC 60909-0. It may be applied for calculating short-circuit currents in low-voltage networks if they are in accordance with typical equipment employed in the user's country. The collected data and their evaluation may be used for medium- or high-voltage planning purposes and also for comparison with data given by manufacturers or electricity suppliers. For overhead lines and cables the electrical data may in some cases also be calculated from the physical dimensions and the material following the equations given in this report. This second edition cancels and replaces the first edition published in 1992 and constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows: - Subclause 2.5 gives equations and examples for the calculation of the positive-, the negative- and the zero-sequence impedances and reduction factors for high-, medium and low-voltage cables with sheaths and shields earthed at both ends. - Subclause 2.7 gives equations and figures for the calculation of the positive-sequence impedances of busbar configurations.
英文名称Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations