基于冲击电流法测量接地电阻的装置

Apparatus Used to Measure Grounding Resistance Based on the Impulse Current

冲击接地电阻是关系电力系统稳定与电气设备安全的重要参数之一。介绍了一种测量冲击接地电阻的装置,其利用波头较陡的冲击电流作为测试电流,通过对采集的电流及响应电压信号进行快速傅里叶变换(FFT),最终计算出冲击阻抗值及其电阻和感性分量。并给出采用微控制器ELANSC520/133、CPLD和高速A/D转换器构成的冲击阻抗测试仪及其程序开发方案。通过装置的模拟测试结果和一组现场试验结果,验证了装置的可靠性。

Impulse grounding resistance is one of important parameters for safe operation of power system and electronic equipment. A measurement apparatus used to measure impulse grounding resistance is introduced. While injecting impulse current with sharp wave head as the test current into grounding systems,the current and voltage signals collected are transformed by Fast Fourier Transform （FFT）, then impulse grounding impedance, resistance and inductance component can be calculated. The apparatus used to measure impulse impedance consists of micro- controller-ELANSC520/133,CPLD and high-speed analog-to-digital converter, and program development are introduced. Finally, simulation test result and field measuring result are given, which proves that the device is reliable. The apparatus has such advantages as small volume, stabilization. In addition, the apparatus can store wave shape and has the communication function. It can completely meet the demand to measure.