十二相同步发电机整流系统直流侧突然短路的研究

分析十二相同步发电机整流系统在空载下的直流侧突然短路，论证了直流侧短路时相当于交流侧而言，相当于十二相对称短路，据此导出了交直流侧短路电流及电磁转矩的表达式，并给出了交直流侧最大短路电流及冲击电磁转矩的实用计算公式，为系统保护装置的设计提供了理论依据。

SUDDEN DC-SIDE SHORT CIRCUIT OF A 12-PHASE SYNCHRONOUS GENERATOR-RECTIFIER SYSTEM

Short circuit on the dc side of a 12 phase synchronous generator rectifier system is analysed in detail. As far as the ac side quantities are concerned, it is shown that dc side short circuit is equivalent to balanced 12 phase short circuit on the ac side. Expressions for ac and dc side short circuit currents and electromagnetic torques are presented, from which practical formulas of the maximum values of short circuit currents and electromagnetic torque are obtained. Comparison between the computed and measured results demonstrates the validity of the theoretical approach developed. Thus, a theoretical basis is provided for the design of selective protection of the system.