包含抽蓄发电机在内的大型水轮发电机转子为具有多匝长绕组的显极式转子，传统的基于交流阻抗测量的绕组匝间短路故障诊断方法存在灵敏性和便捷性等方面的不足。基于多导体传输线理论建立了显极式转子绕组的端口频域特性模型，通过仿真分析提出了故障判别和定位方法。最后通过真机转子的故障模拟和测试对诊断方法的有效性进行了验证。仿真和试验结果表明，所提方法能够在无需断开磁极间电气连接的测量条件下实现绕组匝间短路故障的诊断和定位。

The rotor of large hydro-generator, including the pump storage generator, is an explicit-pole rotor with multi-turn and long winding. The traditional fault diagnosing method of winding inter-turn short circuit based on AC impedance measurement has shortcomings in sensitivity and convenience. Based on the theory of multi-conductor transmission line, the port frequency domain characteristic model of the explicit-pole rotor winding is established, and the fault diagnosing and locating methods are proposed through the simulation analysis. Finally, the validity of the diagnosis method is verified by the fault simulation and test of the real rotor. The simulation and test results show that the proposed method can realize the diagnosis and location of winding inter-turn short circuit fault without disconnecting the electrical connection between magnetic poles.