Test method and platform for magnetic properties of transformer laminated core with controllable excitation conditions

Abstract

The invention relates to a method and a platform for testing the magnetic properties of transformer lamination iron cores with controllable excitation conditions, belonging to the field of magnetic performance testing of lamination iron core materials. The invention comprises a voltage regulator (1), a programmable frequency converter (2), an LC filter (5), a product-level transformer core lamination model (6) and a power analyzer (9). The computer controls the programmable frequency converter to output the required pulse voltage with equal amplitude and different width. The pulse voltage is filtered by LC to obtain the required arbitrary voltage waveform, and the filtered waveform is used as the excitation of the product-level transformer core lamination model. voltage test. To generate PWM excitation conditions, the LC filter module can be removed, and the laminated iron core model can be powered directly by the inverter. The invention can simulate the actual operating conditions of the transformer core, generate arbitrary voltage excitation conditions such as harmonics, magnetic bias, and PWM that can be artificially controlled, and can realize the measurement of the magnetic field and loss characteristics of the laminated iron core under any given excitation conditions.

Description

technical field [0001] The invention relates to a method and a platform for testing the magnetic properties of transformer lamination iron cores with controllable excitation conditions, belonging to the field of magnetic performance testing of lamination iron core materials. Background technique [0002] With the needs of the power transmission and transformation industry and industrial development, the actual working conditions of transformers have changed. The iron core of the transformer does not always work under the condition of sinusoidal voltage excitation, but often works under non-sinusoidal excitation conditions such as harmonics, bias magnetic field and PWM. Traditional silicon steel sheet magnetic performance test methods, such as Epstein square circle method, single sheet measurement method, etc., are all measured under the specified standard sinusoidal excitation conditions, and their performance data cannot truly reflect the transformer core under actual worki...

AI Technical Summary

Problems solved by technology

Traditional silicon steel sheet magnetic performance test methods, such as Epstein square circle method, single sheet measurement method, etc., are all measured under the specified standard sinusoidal excitation conditions, and their performance data cannot truly reflect the transformer core under actual working conditions. Real-world performance of laminated materials

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