Research Of Grounding Resistance Measuring Device Based On Embedded Systerm

Grounding resistance is a main technical parameter of power plant and substation grounding system. The change of grounding resistance relates the safe operation of the power system directly. But how to measure grounding resistance of large grounding grid simply and exactly is a difficult problem to electric power staff all the time.Firstly this paper describe the meaning of grounding resistance measure and development background, enumerate the various ground resistance testing theories,methods and related measurement equipment in different historical periods.Next, this paper analyze the advantage and princeple of different frequency measurement and three pole way of wiring and give the error analysis.To grounding resistance measuring device, the whole hardware frame using the ARM which is the control core of the systerm is designed,firstly,and the related function modules of the hardware are designed.Next the embadded Linux systerm is tailored,configurated and transplanted as to the hardware of the meaturing device. And the related hardware drivers are developed.In the fourth chapter of the paper the systerm software is designed.Firstly,the software of all function modules are designed.Next using the QT Designer and KDevelop the whole software frame is designed.Using the signal and trough mechanism of the QT the control and conmmunication of the function modules is achived.As this paper,the developed device has finished the related hardware drives and embadded Linux systerm. It's a good plant to achive more functions of the grounding resistance measuring device.