The two key conditions for demagnetization are: alternating magnetic poles and decreasing magnetic field strength. To demagnetize a ferromagnetic material, the uniformity of its magnetic domain alignment must be disrupted, making the arrangement of the magnetic domains completely random so that no magnetism is exhibited externally. Read More

The primary source of transformer noise is the core. Core noise is caused by core vibration resulting from the magnetostriction of silicon steel sheets and magnetic attractive forces. The magnitude of magnetostriction is related to the material of the silicon steel sheets and the tightness of the core; the higher the magnetic flux density of the core, the greater the magnetostriction of the silicon steel sheets. The condition of the stacking joints in the transformer core affects the flow of magnetic flux, causing the core to generate noise of varying degrees and magnitudes. If the AC power supply contains harmonic components, it will lead to increased noise. The fundamental frequency of core noise is twice the power supply frequency, along with noise at various integer multiples of that frequency. Additionally, electromagnetic forces between winding conductors or between coils can also cause vibration and lead to noise. The following are several countermeasures for suppressing noise: Read More

Operators must conduct self-inspections and cross-inspections on the parts they process. During the self-inspection and cross-inspection process, if problems are identified and corrected, no penalties will be imposed. However, before transferring to the next process, the parts must be inspected by a full-time quality inspector and can only proceed if they pass. If quality issues are found at this stage, the operator will be penalized based on the specific situation, while the full-time quality inspector will be exempt from penalty. If quality issues are discovered later due to missed inspections or failure to detect them, both the full-time quality inspector and the operator will be penalized once discovered, and the person who identifies the issue will be rewarded. The no-load loss of the transformer core must not exceed the specified design value. Read More