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A three-dimensional computation model of UHVDC has been designed, which is used to offer higher accuracy in the assessment of reradiation interference protecting distance between radio station and UHV power lines. The model is excited by vertically polarized plane wave, and then the interference of requested point is calculated. Based on the wire and surface electric field integral equations of interference...
The importance and recent achievements in the field of noise control of power transformer are expounded in this paper. Oscillation is presented as the reason for the transformer and cooling system noise. The methods used in transformer noise research are summed up. Generally speaking, far-field radicalization noise can be analyzed by summing up statistic data and setting calculating model, and sound...
This paper introduces absolute measuring method, simple relative method in common use and new synthetical relative method (SRM) [1] on on-line monitoring. From principle of method and applied effect in practice, SRM can settle stability and reliability problem in two foregoing methods to a certain extent But the method need be further improved in three aspects. Firstly acquirement of complete period...
Two novel methods, digital calculation based on Callahan algorithm and dynamic simulation based on MATLAB/SIMULINK software, are proposed in this paper to study the electromagnetic transient process caused by asynchronous energization of electric power transformer while taking non-linearity into consideration. The effectiveness and accuracy of the results are verified by each other. Then regularity...
Two novel methods, digital calculation based on Callahan algorithm and dynamic simulation based on MATLAB/SIMULINK software, are proposed in this paper to study the electromagnetic transient process caused by asynchronous energization of electric power transformer while taking non-linearity into consideration. The effectiveness and accuracy of the results are verified by each other. Then regularity...
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