基于PTC材料的短路限流保护方案及PTC限流特性研究

分析了现有电力系统短路限流保护技术在低压独立电力系统中应用存在的问题，提出了一种基于PTC材料的可恢复型断路器的拓扑结构并说明其工作原理；完成了PTC热敏电阻应用于蓄电池组电源短路限流的试验测试，给出了不同电流下PTC材料电阻变化过程的试验结果,并对于将PTC材料应用于短路限流保护的电阻变化特性进行了分析，试验表明，应用该拓扑结构限流效果显著，具有良好的应用前景。

Research on PTC current limiting characters and fault current protect scheme based on PTC material

This paper analyses the problem of existing fault current limiting technology's application in low-voltage independency power systems. A topology scheme of resumable breaker based on PTC heat-sensitive resistance is put forward and its working principle is explained. The fault current limiting device based on PTC heat-sensitive resistance is tested with the accumulator source and the testing results is presented. The resistance change characters of PTC material applying in fault current limiting is analyzed. Testing results shows that the PTC material which can limit the fault current effectively has a nice prospect of application. This project is supported by National Natural Science Foundation of Hubei Province(No.2004ABA026).