Hysteresis loss improvement and eddy current on-line monitoring method for excitation transformer

Abstract

The invention discloses a hysteresis loss improvement and eddy current on-line monitoring method for an excitation transformer, belonging to the technical field of design and manufacture of transformers. The method requires the following devices: an excitation-free high-strength steel plate (1), a polymer insulation sill piece (2), a high-permeability pulling plate (3), a demagnetization hole (4) and a sensor. The surface of the excitation-free high-strength steel plate (1) is coated with a thin insulation paint layer, so that eddy current can circle round only in a narrow loop so as to increase the resistance of an eddy current loop and reduce eddy current loss. The high-permeability pulling plate (3) can effectively fill an effective section of an iron core so as to reduce magnetic flux density and the eddy current loss of the iron core per se. The sensor is arranged on the polymer insulation sill piece (2, so that the hysteresis and eddy current losses of the transformer in different operation conditions can be monitored and the efficiency of the transformer is increased. The method can be widely applied in power transformer design and manufacture enterprises, and the energy-saving and cost-reducing purposes are achieved.

Description

technical field [0001] The invention discloses a method for improving hysteresis loss and eddy current online monitoring of an excitation transformer, belonging to the technical field of transformer design and manufacture. Background technique [0002] The excitation transformer is a device specially designed to provide three-phase AC excitation power for the generator excitation system. It is a static electrical device with no mechanical loss and only copper loss and iron loss. Iron loss is mainly composed of eddy current loss and hysteresis loss in the iron core. [0003] The generation of transformer eddy current loss is due to the alternating magnetic flux in the transformer core. The alternating magnetic flux induces an electromotive force in the winding, and at the same time induces an electromotive force in the iron core, and excites a self-contained loop current inside the iron core, that is, an eddy current. And because the iron core has a certain resistance, the ...

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Problems solved by technology

[0004] Any power transformer, as long as it is put into the grid, will have hysteresis loss and eddy current loss

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