As a common electrical fault of the large turbo-generator

the inter-turn short circuit in field windings leads to bad influence such as field current increase

output reactive power decrease

vibration aggravation

etc. Since most turbo-generators have no installation condition for a branch current transformer

application of the fault monitoring principle based on the stator unbalanced current RMS is limited. However

vibration caused by faults provides a new line of thought for monitoring. Therefore

proceeding from an analysis of the steady-state current characteristics of stator and rotor during inter-turn short circuit in field windings

comprehensive considerations is given to the interaction between various space magnetic fields and the thermal deformation of the rotor

while investigating the after-fault vibration characteristics of the stator and rotor of the generator. The correctness of the theoretical analysis is verified through research of fault cases

and the key factors influencing the amplitude of the vibration are analyzed.