短路电流.效应计算.第2部分:计算实例

[中文适用范围]： 本部分IEC 60865（技术报告）的目的是展示IEC 60865-1中提出的短路机械和热效应计算程序的应用。因此，本技术报告是对IEC 60865-1的补充。然而，它并未改变该出版物中给出的标准化程序基础。 特别需要注意以下几点： a) 本技术报告中的示例说明了如何以简化和易于遵循的方式根据IEC 60865-1进行计算。它们不用于检查计算机程序。 b) 方程末尾括号中的数字指的是IEC 60865-1:2011中的方程。 c) 系统电压称为标称电压。 d) 结果四舍五入到三位有效数字。 e) 短路效应作为异常负载出现在开关设备的正常运行机械负载之外。在以下刚性导体的示例中，还计算了可能的静态预加载。根据是涉及正常运行的负载还是短路期间的负载，使用不同的安全系数。这些系数的高度是典型选择的，并推荐使用。然而，根据安全概念，可能需要其他安全系数。 [外文原描述]： IEC TR 60865-2:2015(E) shows the application of procedures for the calculation of mechanical and thermal effects due to short circuits as presented in IEC 60865-1. Thus, this technical report is an addition to IEC 60865-1. It does not, however, change the basis for standardized procedures given in that publication. This second edition cancels and replaces the first edition published in 1994 and constitutes a technical revision. It includes the following changes. The determinations for auto reclosure together with rigid conductors have been revised. The configurations in cases of flexible conductor arrangements have been changed. The influence of mid-span droppers to the span has been included. For vertical cable-connection the displacement and the tensile force onto the lower fixing point may be calculated now. Additional recommendations for foundation loads due to tensile forces have been added. The subclause for determination of the thermal equivalent short-circuits current has been deleted (is part of IEC 60909-0:2001 now). The standard IEC 60865-1:2011 has been reorganized and some of the symbols have been changed to follow the conceptual characteristic of international standards.