Method and platform for testing magnetic performance of laminated iron core of transformer in controllable excitation conditions

Abstract

The invention relates to a method and platform for testing magnetic performance of a laminated iron core of a transformer in controllable excitation conditions. The method is related with a voltage regulator (1), a programmable frequency converter (2), an LC filter (5), a product-stage transformer laminated iron core model (6) and a power analyzer (9). A computer controls the programmable frequency converter to output needed pulse voltage uniform in amplitude but unequal in width, any needed voltage waveform is obtained after the pulse voltage is filtered, and the filtered waveform serves as excitation voltage of the product-stage transformer laminated iron core model for testing. If a PWM excitation condition needs to be produced, an LC filtering module is removed, and then an inverter directly supplies power to the laminated iron core model. The actual operation work conditions of the iron core of the transformer can be simulated, any voltage excitation condition such as harmonic wave under manual control, bias magnetism and PWM can be generated, and accordingly measurement of a laminated iron core magnetic field and loss performance can be measured in any given excitation condition.

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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