Diagnosis of Rotor Winding Inter-Turn Short-Circuit of Hydro-Generator Based on No-load Curve Reverse Calculation

作者：Li, Yong-gang; Wang, Luo^*; Ma, Ming-han

来源：IEEJ Transactions on Electrical and Electronic Engineering, 2019, 14(1): 130-137.

DOI：10.1002/tee.22770

• hydro-generator
• inter-turn short-circuit of rotor winding
• no-load curve
• fault diagnosis system

The rotor winding inter-turn short-circuit in hydro-generators has been plaguing power producers in terms of production safety and economy. At present, the fault detection methods for hydro-generator rotors are offline or complex. To solve this problem, this paper presents the no-load curve reverse calculation method. The method only requires electrical parameters such as the active power, reactive power, voltage, and current. This method calculates the normal excitation current using the hydro-generator's electromagnetic relationship and the no-load curve in the case of saturated operation. It can identify the inter-turn short-circuit fault by comparing the difference between the normal calculated excitation current and the measured excitation current. The correctness of this method is verified with an experiment using an actual hydro-generator of a hydropower plant and a faulty synchronous generator. Based on the no-load curve method, the rotor inter-turn short-circuit fault diagnosis system is developed by the research team. The diagnostic system does not need to increase the new monitoring point of the hydro-generator by reading the original electrical parameters of the generator to diagnose the hydro-generator rotor inter-turn short-circuit fault online.

• 出版日期2019-1
• 单位华北电力大学