The Research On The Graphic Technology Of The CAD System Of Power Distribute Network Under Mine

The CAD technology provides the fast and effective way to the developers. It can accelerate and optimize the design process and make it to be the best effect. It can keep developers out of the burdensome computing and drawing work. Although the CAD technology has been used in many aspects, it is hardly spread in the designing of power distribute network under mine.This paper discusses and builds the graphic module of CAD system of power distribution network under mine. It first gives an analysis of the framework of the whole system and confirms the function and station of the graphic module. This paper builds the function framework. It separates the function of the graphic module into five parts, including data-pretreatment function, graphic-editing function, graphic-viewing function, graphic-I/O function and assistant function. Then it designs the data-organizing module and data-storing pattern adapted to this CAD based on the practical need. In the data-organizing module, the data is divided dimensional characteristic data and electric property data. Since the data of the system includes the data of the device object and the data of the device type, this system applies the mixed data-storing pattern. The data of the device object is saved into document files and the data of the device type is saved into database. In order to ensure the system of new version can open the documents created by the system of old version, this paper design the version-control technology. The device-snap technology provides the convenience of connecting the devices while drawing the blueprinting. It reduces mistakes of weak connecting and ensures the topological relation of the blueprint. Moving devices will change the topological relation of devices, In order to keep the original topological relation after moving devices, this paper designs the topology-move technology and gives the arithmetic. In order to keep the modules independent, this paper separates the graphic system into five modules based on the thinking of Object-orient and modularization. And it makes a detail discussion of every module.