Research on the Factors Influencing the Deterioration of Inter-turn Short Circuit Fault in Turbo-generator Rotor Winding
Inter-turn short circuit of rotor winding is a common fault in large generators,accounting for a high proportion of generator electrical faults,and also one of the main reasons affecting the safe operation of the units.This article focuses on the local overheating problem associated with inter-turn short circuits in rotor windings,and investigates the effects of short-circuit point transition resistance,short-circuit point current beaming effect,and the repeated conduction and disconnection process of short circuit points.Taking a 300MW turbine generator as an example,the short-circuit loop current and power loss,the excitation current density near the short-circuit point and the transient voltage law of the short-circuit loop are obtained by simulation.This study lays a theoretical foundation for determining the cause of overheating phenomenon of rotor winding inter-turn short circuit fault,and also provides an analytical approach for further study of fault evolution process.
turbine generatorexcitation currentinter-turn short circuittransition resistancepower lossbeaming effecttransient voltage
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