同步电机定子绕组内部故障规律探讨

Laws of Internal Faults Occuring Inside the Stator Windings of Synchronous Machines

本文应用多回路分析法对同步电机定子绕组内部故障规律进行了比较全面的探讨,包括匝间短路匝比规律、故障位置规律、以及系统电压不对称和负载变化的影响。文中首次揭示了故障空间位置对故障后物理量和保护灵敏度的重大影响,得出多分支分布中性点纵差、横差及单元件横差保护等的灵敏度分析时,必须考虑短路位置的影响的结论。

The laws govering the faults occuring inside the stator winding of synchronous machines are investigated by the Multi-loop Method, including both the laws of the number or the location of the shorted coils, and the infl uence of the asymmetry of the power supply or the load change. The fact is discovered for the first time in the paper that the location of the shorted coils greatly affects the quantities(voltage, current, power etc.) of the faulted generators and the sensitivity of its protections. And it is concluded that one must take into account the location of the shorted coils when analyzing the sensitivity of Differential, Split Differential, and Single Element Transverse Differential Protections of the generators with multi-branch and distributed neutral arrangement.