Calculation And Analysis Of Electromagnetic Field And Temperature Field Under Short-circuit Fault Of 500MW Hydro-generator

With the development of my country’s hydropower industry,the requirements for the performance of hydroelectric generators are getting higher and higher.The actual operation of the hydro-generator is a very complex physical process.If a short-circuit fault occurs in the hydro-generator,its destructive power is extremely strong,which will seriously affect the stable operation of the generator itself and even the power system.Therefore,it is necessary to analyze the electromagnetic field and temperature field of the hydroelectric generator.In this paper,the finite element method is used to simulate the electromagnetic field and temperature field of a 500 MW hydrogenerator under short-circuit fault conditions.Firstly,it introduces the background and research significance of the subject,as well as the current research status of the electromagnetic field and temperature field in the motor at home and abroad.Secondly,through the theoretical analysis of the finite element method,it can be known that the finite element method can solve the electromagnetic field and temperature field state in the motor,and the result of the solution is more accurate and closer to reality.Then,the finite element method is used to calculate the two-dimensional electromagnetic field under the rated load conditions of the hydro-generator,single-phase short-circuit,two-phase ground short-circuit,and three-phase sudden short-circuit conditions.Pivot winding current,field winding flux linkage and magnetic density of each component,etc.,analyze the performance of the generator set and the power grid under three short-circuit fault conditions.Finally,the finite element method is used to calculate the two-dimensional temperature field of the hydro-generator under rated load conditions,single-phase short-circuit,two-phase ground short-circuit,and three-phase sudden short-circuit conditions,and the hydro-generator under different operating conditions is obtained.In the internal temperature distribution,the influence of three kinds of short-circuit faults on the temperature of various components in the generator is analyzed.The research and analysis in this article can provide reference for the design and performance analysis of other hydroelectric generators.