直流短路计算——示波图法

Calculation of DC Short Circuit--Oscillogram Method

作者根据自身实践经验和电路的基本理论，提出地铁牵引供电系统直流短路计算有两种方法：一是电路图法；二是示波图法。本文主要是论证用第二种方法进行计算，从中计算出稳态短路电流、时间常数和短路电流上升率，并列举现场实拍示波图进行计算的实例。

According to the practice experience and basic theories of electrocircuit, the author raises two calculation methods for the DC short circuit of traction power supopply system of metro. The first is the method of circuit diagram. The second is the methodof oscillogram. In this article, the author demonstrates the second calculation method, and figures our the steady short circuit current, the time constant and the rise rate of short circuit current. At the same time, the author presents the actual calculation example according to actual oscillogram shot at site.