Safety Risk of Synchronous Condenser with Typical Asymmetric Magnetic Field Faults Under Extreme Operating Conditions

doi:10.11930/j.issn.1004-9649.202210010

Abstract

Abstract: Under typical magnetic field asymmetry faults, the synchronous condenser has an increase in unbalance force formed by forced excitation and tripping risk. Firstly, an analysis is made of the influence mechanism of typical faults such as rotor dynamic eccentricity and rotor winding inter-turn short circuit on the magnetic field of the synchronous condenser. Then, the expression of unbalanced magnetic pull on the rotor is derived using air-gap permeance method, and the influence of forced excitation on the unbalanced electromagnetic force is further analyzed. Finally, the finite element electromagnetic transient simulation is carried out on a large synchronous machine to simulate the dynamic eccentricity and the rotor winding inter-turn short circuit fault. The unbalanced electromagnetic force on the rotor is extracted respectively under the conditions of normal excitation and forced excitation, and the possibility of tripping under forced excitation is evaluated. The results show that under the forced excitation, the unbalanced magnetic pull produced by the dynamic eccentricity fault of synchronous condensers will not cause severe vibration of the unit, while the rotor inter-turn short circuit fault produces a big unbalanced magnetic pull, which may result in the unit tripping.

Key words: synchronous condenser, rotor dynamic eccentricity, rotor winding inter-turn short circuit, forced excitation, unbalanced electromagnetic force

CAO Guizhou, CHEN Erqiang, FAN Xuanjie, WU Yucai, LI Zhenping, SHI Shuhuai. Safety Risk of Synchronous Condenser with Typical Asymmetric Magnetic Field Faults Under Extreme Operating Conditions[J]. Electric Power, 2023, 56(2): 45-52,76.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202210010

https://www.electricpower.com.cn/EN/Y2023/V56/I2/45

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