基于两分量法在中性点不接地系统应用研究

An Application Study on Center Point Ungrounded System Based on Two-component Method

由对称分量导出了两分量法,分析了两分量法解电力系统故障方法及与对称分量间关系,得出中性点不接地系统相间故障用差量解相间故障的方法。分析了差量选相原理,提出了采用差量突变量单端测距理论基础,测距精度满足工程要求。提出了中性点不接地系统只有两相装设电流互感器求解差量处理方法。

This paper analyzes the solution to power system faults in the two-component method derived from symmetrical component as well as the relationship between the method and symmetrical component, and gives the method of using the difference to solve phase-to-phase faults in the center point ungrounded system. It also analyzes the principle of phase selection through difference and presents the basic principle of single-ended ranging through break-variable of difference, with the ranging accuracy satisfying engineering requirements. Finally, it presents a method for solving the difference in a center point ungrounded system with only two phases having a current transformer.