| Due to the contrary distribution of energy resource and energy demand,Chinese power transmission line is developing towards the direction of ultra-high voltage(UHV)transmission line with long distance and large capacity,and UHV power transmission has effectively promoted energy conservation and emission reduction as well as optimal allocation of energy resources.Shunt reactors,as the key equipment to solve the line capacitance effect of long-distance,large-capacity UHV line,can improve the transmission capacity,enhance system static and dynamic stability and reduce power frequency over-voltage amplitude and active loss;however,magnetism,thermo and vibration of shunt reactors have always been recognized as a tough issue in the electrical equipment industry,being the focus of domestic and foreign scholars.Through developing the analysis software for the loss and temperature rise calculation of the leads of transformers and shunt reactors,this paper has provided an effective analysis method for the magnetic-thermo problem,as well as the manufacturing,commissioning and safe operation of UHV shunt reactors.This paper studies the working principle of UHV shunt reactors,the electromagnetic parameter calculation principle and the basic principle of commonly used numerical methods of magnetic-thermo problem of shunt reactors,mainly including two-dimensional static magnetic field calculation principle,the principle of three-dimensional magnetic field calculation integral equation method numerical solution and the oil temperature rise calculation principle and winding temperature rise calculation principle under different cooling methods.A simulation study of magnetocaloric effect on the 1100kV/320MVar UHV shunt reactor based on the software XDS2 for the auxiliary electromagnetic design and finite element magnetic-thermo calculation of shunt reactors has been conducted,in which the inductance,magnetic characteristics,temperature rise of core,windings and metal structures,etc.of UHV shunt reactors have been researched,and the simulation results show that the simulated performance parameters are very close to experimental values,which indicates that the simulation calculation method is feasible.Considering the various complex kinds of leads structures and frequent partial overheat accidents in the current transformer industry,and in order to make up for the present shortage of temperature rise calculation method of leads,by applying VisualBasic6.0 platform and combining the methods of analytic calculation and numeric calculation,it has developed the LeadTherm Program and software package for calculating transformer leads temperature rise,with friendly interface and operating easily.Compared with the results of complex commercial software and the actual measured data of fiber temperature measurement tests,it is found that this program possesses the merits of simple operation,high computing accuracy and better practicability for the project. |
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