基于多回路理论的转子匝间短路时定子并联支路环流分析

Characteristic Analysis of Circular Current in Generator Stator Parallel Branches When Inter-turn Short-circuit of Rotor Windings Occurs Based on Multi-loop Theory

发电机的转子绕组匝间短路故障会造成发电机定子并联支路的环流增大,而目前对于定子并联支路环流的分析主要通过实验检测及定性分析,由于不能准确计算故障电流等电气量,在实际应用中存在局限性。针对SDF-9型故障模拟实验机组的转子绕组匝间短路进行模拟仿真并对故障进行定量计算,通过实验验证由多回路模型所计算的定子并联支路环流大小的准确性,从而可依据此模型准确计算转子匝间短路不同短路匝数时的定子并联支路环流大小,为转子匝间短路的保护提供依据。

The circular current in the parallel branches of generator stator winding appears because of inter-turn short-circuit of rotor windings. Up to now, the analysis of the circular current is only qualitative, fault current cannot be calculated accurately. That is why it has limited practical application. The simulation for the inter-turn short-circuit of rotor winding on SDF-9 fault simulation experiment unit is carried out and the current is calculated quantitatively, and the experimental result coincides with the calculated one. Thus the value of the circular current in parallel branches of generator stator winding for different short- circuit turns of rotor winding can be calculated accurately. The protection basis for the inter-turn short-circuit of rotor winding has been provided.