浅析DDL保护装置在轨道交通牵引中的应用

目前上海轨道交通的牵引动力为直流牵引方式，其直流短路主保护则采用电流变化率（di／dt）和电流增量（△｜）保护，且DDL保护装置均使用国外生产的保护单元，例如，地铁二号线使用SIEMENS公司生产的SITRAS DPU96保护单元，地铁八号线则采用Secheron公司生产的SEPCOS保护单元，等等。本文着重对上述两种保护单元的工作原理、动作逻辑、动作可靠性及其故障判断准确性等方面进行详细的分析比较。

Analyse the application of DDL protective device in rail transit traction

Currently, Shanghai Rail Traffic traction power to the DC fraction, its main short-circuit protection of DC current rate of change is used （di / dt） and current incremental （△｜） protection, and DDL protection devices are used to protect the foreign production unit, for example, , The use of Metro Line 2 SIEMENS company＇s SITRAS DPU96 protection unit, the MTRC on the 8th line is used Secheron company＇s SEPCOS protection unit, and so on. This article focuses on these two units to protect the principle of action logic, reliability and fault movements, such as accuracy of judgement in conducting a detailed analysis and comparison.