设计模式在继电器特性曲线类库开发中的应用

微机型继电保护利用软件技术实现特性曲线,脱离了传统保护实现上的很多束缚,从而可以设计出更为复杂、更为灵活、更能满足保护四统一要求的动作特性曲线。然而,这也为开发通用化的继电保护测试软件带来了很大的困难。因此,封装优良、复用性好且可扩展性强的继电器特性曲线类库对于继电保护测试软件的开发有重要意义。设计模式就是面向对象软件的设计经验的总结,可以直接用于指导各种面向对象软件的设计。针对继电器特性曲线类库开发中遇到的问题,提出由Facade和Strategy模式相结合的解决方案。该类库已经成功应用于继电保护测试软件中。

Applying design patterns to the development of the relay plot library

With the help of many new technologies,digital relays can perform much better than traditional relays.A large number of new relays have been developed recently.The operating behaviors of different relays vary a lot,which makes it difficult to develop flexible software for protective relay testing.So it is valuable to develop a library which is applicable to all kinds of relays.The library should be well encapsulated,easily reusable and expandable.Captured by experienced object-oriented designers,design patterns can be applied to solve some kinds of object-oriented design problems.During the development of the RelayPlot library many problems came out.By using the following design patterns of Facade and Strategy,the problems have been solved.The library,has been successfully used in a relay testing software.