【摘要】 电流保护的构成元件有电磁感应型，晶体管型，微型机。通过分析电流保护的特征，设计了一种新型的采用 Ｐ Ｌ Ｃ 为核心的电流保护装置。原有保护装置所具有的逻辑部分可以通过用 Ｐ Ｌ Ｃ 的编程来实现。软件设计所完成的保护功能有：电流保护，自动重合闸保护，后加速保护预设的零序保护以及灯光报警等。适用于中、低压，辐射式网络结构。这样就用逻辑编程代替了原有系统的硬件接线及硬件逻辑，因此，在可靠性、成本、体积、实施的控制策略，工作方式，易于操作、维护等方面都显示出独特的优点。更多还原

【Abstract】 The constituted elements of the current protective device have three type:electromagnetic,transistor and also microcomputer.This paper introduces a new current protective device based on PLC by analysis the character of the current protective.The logical part of current protective device is constituted by PLC.The software is designed for realization the function of current protection coinage and the lighting alarm of the later speed protective.The device can used in middle lower voltage radioactive network.The logic programming replaces the previous hardware line connection and lardware logic.The new current protective device has the advantages in reliable,cost,volume,working way and maintain.In this paper,Author states its software design processing.The test shows the system achicve the expected purpose.更多还原