BS EN 60909-0:2016适用于低压三相交流系统和高压三相交流系统的短路电流计算，其标称频率为50 Hz或60 Hz。具有长输电线的最高电压为550 kV及以上的系统需要特殊保护 考虑IEC 60909的这一部分建立了一个通用、可行和简明的程序，以 结果通常具有可接受的准确性。对于这种计算方法，等效的 介绍了短路位置的电压源。这并不排除使用 特殊方法，例如叠加法，根据特定情况进行调整， 如果它们至少给出相同的精度。叠加法给出了简短的结果- 环行 与预先设定的一个潮流相关的电流。因此，这种方法并不适用 必然导致最大短路电流。IEC 60909的这一部分涉及在以下情况下短路电流的计算: 平衡或不平衡短路。单线接地故障不在IEC 60909本部分的范围内。在同一线路中，两个单独的同时单相线路对地短路时的电流 中性点隔离系统或中性点谐振接地系统，见IEC 60909-3。短路电流和短路阻抗也可通过系统测试确定， 通过网络分析仪或数字计算机进行测量。在现有的低压系统中 系统可以根据测量结果确定短路阻抗 在考虑的潜在短路位置。短路阻抗的计算通常基于变压器的额定数据 电气设备和系统的拓扑布置具有以下优点: 既可用于现有系统，也可用于规划阶段的系统。一般来说，考虑两种不同大小的短路电流:决定电气设备容量或额定值的最大短路电流 设备和最小短路电流，例如，可以作为选择 保险丝，用于设置保护装置和检查电机的启动。注:三相短路中的电流假定在所有电极中同时产生。 对可能导致短路电流的非周期分量更高的非同时短路的调查超出了IEC 60909本部分的范围。IEC 60909的本部分不包括在以下情况下故意产生的短路电流: 受控条件（短路测试站）。IEC 60909的这一部分不涉及电路中短路电流的计算 安装在船上和飞机上。交叉引用:IEC 60038:2009IEC 60050-131IEC TR 60909-1:2002IEC TR 60909-2:2008IEC 60909-3:2009IEC TR 60909-4:2000EN 60038:2011EN 60909-3:2010IEC 60050-151:2001IEC 60050-195:1998IEC 60050-195:1998/AMD1:2001IEC 60865-1IEC 62428IEC 60949IEC 60986EN 60865-1EN 62428购买本文件时可提供的所有现行修订件均包含在购买本文件中。

BS EN 60909-0:2016 is applicable to the calculation of short-circuit currentsin low-voltage three-phase AC systems, andin high-voltage three-phase AC systems,operating at a nominal frequency of 50 Hz or 60 Hz.Systems at highest voltages of 550 kV and above with long transmission lines need special consideration.This part of IEC 60909 establishes a general, practicable and concise procedure leading to results which are generally of acceptable accuracy. For this calculation method, an equivalent voltage source at the short-circuit location is introduced. This does not exclude the use of special methods, for example the superposition method, adjusted to particular circumstances, if they give at least the same precision. The superposition method gives the short-circuit current related to the one load flow presupposed. This method, therefore, does not necessarily lead to the maximum short-circuit current.This part of IEC 60909 deals with the calculation of short-circuit currents in the case of balanced or unbalanced short circuits.A single line-to-earth fault is beyond the scope of this part of IEC 60909.For currents during two separate simultaneous single-phase line-to-earth short circuits in an isolated neutral system or a resonance earthed neutral system, see IEC 60909-3.Short-circuit currents and short-circuit impedances may also be determined by system tests, by measurement on a network analyser, or with a digital computer. In existing low-voltage systems it is possible to determine the short-circuit impedance on the basis of measurements at the location of the prospective short circuit considered.The calculation of the short-circuit impedance is in general based on the rated data of the electrical equipment and the topological arrangement of the system and has the advantage of being possible both for existing systems and for systems at the planning stage.In general, two types short-circuit currents, which differ in their magnitude, are considered:the maximum short-circuit current which determines the capacity or rating of electrical equipment; andthe minimum short-circuit current which can be a basis, for example, for the selection of fuses, for the setting of protective devices, and for checking the run-up of motors.NOTE The current in a three-phase short circuit is assumed to be made simultaneously in all poles. Investigations of non-simultaneous short circuits, which may lead to higher aperiodic components of short-circuit current, are beyond the scope of this part of IEC 60909.This part of IEC 60909 does not cover short-circuit currents deliberately created under controlled conditions (short-circuit testing stations).This part of IEC 60909 does not deal with the calculation of short-circuit currents in installations on board ships and aeroplanes.Cross References:IEC 60038:2009IEC 60050-131IEC TR 60909-1:2002IEC TR 60909-2:2008IEC 60909-3:2009IEC TR 60909-4:2000EN 60038:2011EN 60909-3:2010IEC 60050-151:2001IEC 60050-195:1998IEC 60050-195:1998/AMD1:2001IEC 60865-1IEC 62428IEC 60949IEC 60986EN 60865-1EN 62428All current amendments available at time of purchase are included with the purchase of this document.