Nanocrystalline magnetic core magnetic field heat treatment method suitable for A type leakage protector

Abstract

The invention discloses a nanocrystalline magnetic core magnetic field heat treatment method suitable for an A type leakage protector. The method comprises the following steps that firstly, a to-be-treated nanocrystalline magnetic core is placed in a transverse magnetic furnace, and inflation of protective gas is conducted; secondly, heat treatment and magnetic treatment are conducted and includea first stage, a second stage, a third stage and a fourth stage, wherein in the first stage, the temperature is increased to about 560 DEG C from the room temperature, and heating and heat preservation are conducted for about 90 min; in the second stage, the nanocrystalline magnetic core subjected to heat treatment in the first stage is discharged out of a furnace and cooled to the room temperature; in the third stage, the nanocrystalline magnetic core cooled in the second stage is placed in the transverse magnetic furnace, the temperature is increased to about 420 DEG C from the room temperature, heating and heat preservation are conducted for about 60 min, and transverse magnetism adding treatment is conducted during annealing; and in the fourth stage, furnace discharging is conducted, and the nanocrystalline magnetic core is cooled to the room temperature; and thirdly, a cooled nanocrystalline magnetic core finished product is obtained. The nanocrystalline magnetic core obtained through the above method is used for the leakage protector, electric leakage can be protected, and direct current pulsating current can be protected as well.

Description

Technical field [0001] The invention relates to a magnetic field heat treatment method suitable for an A-type leak-proof nanocrystalline magnetic core. Background technique [0002] With the development of modern technology, a large number of electronic products in family life (such as electronic energy-saving lamps, microwave ovens, etc.) are widely used; three-phase bridge rectifier circuits in industrial equipment are increasing day by day, and frequency conversion equipment continues to increase. The voltage waveform contains a large number of harmonics, and these harmonics will generate leakage current to the ground through the parasitic capacitance of the motor windings and the parasitic capacitance of the motor cable. When these devices fail, the residual current generated is no longer just a pure sine waveform power frequency signal, but a pulsating DC component. When this non-sinusoidal residual current reaches a certain level, it will affect the detection of traditiona...

AI Technical Summary

Problems solved by technology

When this non-sinusoidal residual current reaches a certain level, it will affect the detection of the traditional RCD (residual current device). Under the action of the pulsating DC component, the magnetic field of the residual current transformer will be biased, or even close to saturation. Reduce the magnetic field strength and induced potential in the RCT, that is, reduce the detection sensitivity of the residual current, which will cause the RCD to refuse to operate and cannot be properly protected, which may easily cause personal electric shock or electrical fire accidents

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