Measuring method for remanence of transformer iron core

A technology of transformer iron core and measurement method, which is applied in the direction of magnetic performance measurement, etc., can solve the problem that the measurement of residual magnetism is less involved, and achieve the effect of convenient inspection and improved safety

Active Publication Date: 2017-05-31
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

Based on the current research status at home and abroad, the current research on the remanence of the main

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  • Measuring method for remanence of transformer iron core
  • Measuring method for remanence of transformer iron core
  • Measuring method for remanence of transformer iron core

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0036] A typical basic magnetization curve of a transformer is as image 3 As shown, it can be divided into three parts: low-voltage nonlinear region, linear region, and high-voltage nonlinear region. In the absence of residual magnetism, when the low-voltage no-load test is carried out on site, the iron core mostly works in the low-voltage nonlinear region. If there is residual magnetism in the iron core, a low-voltage test voltage is applied to the winding, and the magnetic induction in the iron core and the residual magnetic induction are superimposed, and the magnetic induction i...

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Abstract

The invention relates to a measuring method for the remanence of a transformer iron core. The method comprises the steps that 1) the magnetization curve of the transformer iron core is acquired, wherein the magnetization curve reveals the relationship between the direct current component of no-load current and the remanence of the iron core; 2) 380V alternating current test voltage is applied to a transformer winding, and the no-load current is measured; 3) the direct current component of the no-load current is acquired; and 4) the iron core remanence is acquired according to the magnetization curve and the direct current component. Compared with the prior art, the measuring method provided by invention has the advantages that the method is simple and feasible, can quantitatively measure the remanence of the main transformer iron core, and guides the development of the degaussing scheme of the remanence of the main transformer iron core; the degaussing effect is evaluated; and a technical support is provided for the test and operation of a main transformer.

Description

technical field [0001] The invention relates to the field of transformer test and operation, in particular to a method for measuring residual magnetism of transformer iron core. Background technique [0002] Transformers operate by electromagnetic induction, using magnetic fields as coupling fields. Transformer cores generally use ferromagnetic materials with high magnetic permeability, such as silicon steel sheets. The magnetic permeability of ferromagnetic materials is nonlinear, and its value changes with the change of magnetic field strength. The reason why ferromagnetic materials have high magnetic permeability is that there are many small magnetic domains with definite magnetic polarity and strong magnetization in ferromagnetic materials, such as figure 1 shown. Under the action of an external magnetic field, the magnetic domains are rearranged regularly along the direction of the external magnetic field, so that the actual magnetic field generated is much larger th...

Claims

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Application Information

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IPC IPC(8): G01R33/12
CPCG01R33/12
Inventor 赵丹丹傅晨钊林敏李红雷黄华
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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