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We produce Encapsulated Transformer, High frequency switching transformer, Low frequency power transformer ,inductor and current transformer.
The proposed method is based on analyzing the frequency spectra of the sound pressure level generated by four representative transformers. The studied transformers have different apparent powers and different constructions. The amplitudes of the spectra are analyzed separately for the background noise at selected measurement points. The amplitudes are then classified in the appropriate frequency intervals. The results show that the transformers do not generate significant audible noise. The A-weighted sound level did not exceed 60 dBA in any of the researched transformers.
The study also examines the effect of various transformer electric parameters on the FRA plots. The method involves injecting a sinusoidal signal with swept frequency into one terminal of the winding and analyzing the output signal at the other terminal of the same winding. The output signal is then measured with Bruel & Kjaer measuring equipment. The method is known as frequency response analysis (FRA). It has become widely used to detect deformation of windings.
The low frequency transformer is a device that transmits energy through electromagnetic induction. It has a smaller structural size and lower antenna losses because it operates at a lower frequency. It is used for various passive circuits, such as the return-loss bridge. Its main application is in the power industry.
The core material of low frequency transformers is generally silicon steel sheet with high permeability. The core is laminated into high resistance paths to minimize hysteresis and eddy current losses. The cores are also made of material with lower susceptibility to enable higher resistivity. In addition, the varnish between laminates of the core increases series leakage inductance.
The primary and secondary windings of the transformer are electrically insulated from the partial core. The partial core is made of ferromagnetic material. The coil turns are small. The magnetizing reactance is proportional to the operational frequency. In order to minimize copper losses, the magnetizing current is reduced.
In addition, a transformer with a large mass provides a flywheel effect. This effect allows the inverter to handle surge for a long time. The transformer's core has a high resistivity that reduces eddy current losses. The mass also helps dissipate heat. It is recommended that the distance between the transformers and the sound source be 50 m. The distance of 75 and 100 m was not found to have an effect on the amplitudes of the spectra.
YZ30S28-1204B-12v 2.8va customized Potting isolation transformer
· Core Type EI 30/18
· Power - 2.8VA
· Input voltage - 230V/115V/115VX2,50/60Hz
· Insulation class - Class B (130°C)
· Ambient temperature (ta)- 40°C
· Dielectric strength - 4, 500Vrms
·Inherently short-circuit-proof
· Self-extinguishing material
· Potted under vacuum
· Weight: 110g
household appliances/ Tubular motor/ Electric telescopic door