大型地网接地电阻测量用变频电源的研制

THE DEVELOPMENT OF FREQUENCY-CHANGING POWER USED IN GROUND RESISTANCE MEASUREMENT OF LARGE SCALE GROUNDING GRID

介绍了变频法测量地网接地电阻的优点及变频电源的设计要求、原理框图和SPWM脉冲实现方法 ,给出了其驱动电路和保护电路的设计及变频电源的主要技术指标 ,其输出频率为 30～ 70Hz(可调 ) ,测量仪精度可达到

THIS PAPER DISCUSSES THE ADVANTAGES OF FREQUENCY CONVERSION METHOD OF GROUND RESISTANCE MEASUREMENT AND INTRODUCES THE DESIGN REQUIREMENTS AND PRINCIPLE DIAGRAM OF THE FREQUENCY-CHANGING POWER, AND THE METHOD OF GAINING SPWM PULSE. THE DRIVING AND PROTECTIVE CIRCUITS AND MAIN SPECIFICATION OF THIS POWER ARE GIVEN IN THIS PAPER.