Abstract
DC bias current flowing into the neutral point of power transformer will seriously affect the normal operation of AC power system. In this paper, exciting current, harmonic component of the excitation current, magnetic flux density and noise of transformer were analyzed when the transformer is in the no-load operation state based on field-circuit coupled method. Through the calculation and analysis, some reference bases are provided for design of transformer.
Highlights
As the implementation of the "transmit the electricity from west to east, north and south to send each other, nationwide network" strategy of China's power grid, high-voltage direct current transmission (HVDC) technology [1,2], which is suitable for high power and longdistance transmission, has been used more and more widely
DC bias current flowing into the neutral point of power transformer will seriously affect the normal operation of AC power system
Taking a single-phase transformer as an example, on the basis of field-circuit coupled finite element method, this paper simulates the DC magnetic bias's impact on exciting current, exciting current harmonic, magnetic flux density and noise of transformer when the transformer is switched to the zero-loaded state
Summary
As the implementation of the "transmit the electricity from west to east, north and south to send each other, nationwide network" strategy of China's power grid, high-voltage direct current transmission (HVDC) technology [1,2], which is suitable for high power and longdistance transmission, has been used more and more widely. Under unipolar-earth way, the DC into the earth will be large up to 3 kA [3] It causes the uneven distribution of surface potential. Taking a single-phase transformer as an example, on the basis of field-circuit coupled finite element method, this paper simulates the DC magnetic bias's impact on exciting current, exciting current harmonic, magnetic flux density and noise of transformer when the transformer is switched to the zero-loaded state. It will be of a great significance for the further study of controlling DC magnetic bias
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