Excitation curve distribution method and device for single-phase double-winding transformer

Abstract

The invention discloses an excitation curve distribution method and device for a single-phase double-winding transformer. According to the excitation curve distribution method in the invention, multiple saturation points are selected in a saturation section of an iron core, flux linkages and excitation current of two excitation branches are iteratively calculated after measuring the apparent saturation inductance of ports, and curve fitting is performed on the flux linkages and excitation current of the multiple saturation points to obtain excitation curves of the two excitation branches. Compared with the traditional distribution method of simply equally distributing excitation parameters to two excitation branches of a Pi model, the excitation curve distribution method improves the simulation accuracy and solves a technical problem of accurately determining excitation curves of the two excitation branches of the Pi model in the saturation section.

Description

technical field [0001] The invention relates to the field of transformer parameter processing, in particular to a single-phase double-winding transformer excitation curve distribution method and device. Background technique [0002] The π model is a classic model for simulating single-phase transformers, and has been widely used in many aspects such as transformer differential protection and broadband modeling. [0003] When the transformer works in the unsaturated region, the excitation parameters are evenly distributed to the two excitation branches of the π model, and the simulation results obtained have higher accuracy. However, once the transformer core enters a deep saturation state, its relative permeability gradually decreases until it approaches 1, at which point the magnetic permeability of the transformer core is almost equal to that of air. [0004] Due to the difference in the structure size of the transformer and the degree of saturation of the magnetic circui...

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Problems solved by technology

[0006] The invention provides a single-phase double-winding transformer excitation curve distribution method, which solves the techn

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