Research Into Unbalanced Electromagnetic Force Resulting from Rotor Winding-Related Short Circuit of Turbine Generator


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Abstract


Unbalanced electromagnetic force is the associated stress of the inter-turn short circuit fault of the rotor winding of a turbine generator. This paper simultaneously uses analytic and numerical methods to calculate the unbalanced electromagnetic force of a rotor and analyze the relationship between the unbalanced electromagnetic force and generator running status. The comparative analysis shows that under either no-load or loading conditions, the electromagnetic force calculated by the analytical method has a greater deviation. Taking into consideration the influence of core saturation, magnetic field skewing, higher harmonics, structure and other factors, the numerical method has more accurate and reliable calculation results. When a power generator emits its constant active power, its unbalanced electromagnetic force does not always increase with its increasing excitation current, so the rotor vibration discrimination method based on the rotor winding-related inter-turn short circuit for excitation current regulation is effective only within a certain range, and a no-load test is more suitable for the rapid diagnosis of an inter-turn short circuit fault of a rotor winding
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Keywords


Inter-Turn Short Circuit of Rotor Winding; Running State; Finite Element; Unbalanced Electromagnetic Force

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