A Method for Determining AC Resistance Coefficient of Medium Voltage Winding of High Frequency Step-Down Transformer
A technology of step-down transformer and AC resistance, used in transformer testing, measuring resistance/reactance/impedance, instruments, etc.
Inactive Publication Date: 2021-04-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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However, when the transformer has a three-winding step-down structure, that is, the medium-voltage winding is arranged in the middle of the three voltage level windings, the method for determining the AC resistivity of the double-winding structure is no longer applicable
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[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0052] The object of the present invention is to provide a method and system for determining the AC resistance coefficient of the medium-voltage winding of a high-frequency step-down transformer, so as to determine the AC resistance coefficient of the medium-voltage winding of the three-winding step-down transformer according to the actual operating state of the transformer.
[0053] In order to make the above objects, features and advantages of the present inv...
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The invention discloses that the invention proposes a method for determining the AC resistance coefficient of the medium-voltage winding of a high-frequency step-down transformer. The magnetic field of a single-turn circular Litz wire winding is decomposed into an internal magnetic field component and an external magnetic field component. The winding current and the low-voltage winding current calculate the internal magnetic field component and the external magnetic field component respectively, and then calculate the synthetic magnetic field of the single-turn circular Litz wire winding of the medium-voltage winding, and calculate the eddy current loss density inside a single circular conductor according to the synthetic magnetic field, and then solve the The power loss per unit length of the medium-voltage winding of the Litz line three-winding step-down transformer is calculated, and finally the AC resistance coefficient of the medium-voltage winding of the Litz line three-winding step-down transformer is calculated. This method can quickly calculate the AC resistance coefficient of the medium voltage winding when the operating state of the three-winding high-frequency step-down transformer of the Litz line is determined, and provide guidance for the optimal design of the high-frequency transformer.
Description
technical field [0001] The invention relates to the technical field of transformer measurement, in particular to a method for determining the AC resistance coefficient of a medium-voltage winding of a high-frequency step-down transformer. Background technique [0002] As the core equipment in large-scale DC source interconnection, electric locomotive traction system and DC power grid, high-frequency transformer plays a vital role in efficient energy transmission, power flow control, high-voltage and low-voltage side electrical isolation and voltage conversion. With the development of power electronic devices and the diversification of application occasions, the demand for three-winding high-frequency transformers in engineering is gradually increasing, but the existing calculation methods for high-frequency transformer winding losses are mostly aimed at double-winding structures. Therefore, it is of great significance to study the winding loss of the three-winding high-frequ...
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IPC IPC(8): G01R31/62G01R27/02G01R33/10
CPCG01R27/02G01R33/10G01R31/62
Inventor 李琳袁轩乔光尧靳艳娇陈少兵邓占锋赵国亮李卫国刘海军李芳义杨春石秋雨苏铁山
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)