Measurement method of excitation curve of transformer under saturation condition

Abstract

The present invention discloses a measurement method of the excitation curve of a transformer under a saturation condition. The invention aims to solve the technical problem that a method which can obtain the operating status of a transformer under a saturation condition through simulation does not exist in the prior art. According to the method of the invention, the excitation inrush current andsecondary-side end voltage of the transformer during the no-load closing of the transformer are measured; by means of numerical integration and calculation, the excitation curve of the transformer isobtained; since the range of the excitation inrush current is wide, the excitation curve contains the excitation feature of the transformer under a deep saturation condition, and therefore, information such as the parameter value of the transformer and the excitation feature of the magnetic core of the transformer under the saturation condition of the transformer can be obtained through the obtained excitation curve; and engineering and maintenance personnel can be facilitated to research the operation status of the transformer under the saturation condition.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a method for measuring an excitation curve in a saturated state of a transformer. Background technique [0002] The transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. The main components are the primary coil, the secondary coil and the iron core (magnetic core). Mainly used for: voltage conversion, current conversion, isolation and voltage regulation, etc. When an alternating current flows through the primary coil, an alternating magnetic flux is generated in the magnetic core, which induces a voltage (or current) in the secondary coil. Among them, the function of the magnetic core is mainly to form a magnetic circuit of coupled magnetic flux with small reluctance. Because of its small reluctance, the working efficiency of the transformer can be greatly improved. [0003] Under normal circumstances, when manufacturing tra...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for measuring the excitation curve of a transformer in a saturated state, which solves the technical problem that there is no method in the prior art that can simulate and obtain the operating state of a transformer in a saturated state

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