新型微机漏电保护装置的研究

The Research for a New Computer Leakage Protection

在分析了我国现有井下低压分支电网漏电保护装置的基础上,提出了新型微机漏电保护的原理。该原理利用井下电网发生单相接地故障时,故障支路的零序有功电流大于非故障相支路的特点,以AT89C51单片机为控制核心完成了有功电流选线的漏电保护装置的设计。该方法不需要快速傅里叶分析、检测零序电流相位、计算有功功率等复杂的设计运算,简化了设计,使系统具有简单,判断迅速,灵敏的特点。

Based on the analysis of our existing branch network in underground low-voltage leakage protection de-vices, a new computer leakage protection is designed. The principle use of the grid is underground single-phase tault. Fault slip road to the zero-sequence active current is greater than non-fault slip road characteristics, AT89C51 to con- trol the core completed the active current alignment of leakage protection device design. The method does not need fast Fourier analysis, detection of computation, simplify the design, zero-sequence current phase, the complex calculation of the active power design the system is simple, quick judgment, sensitivity characteristics.