Core efficiency dictates the lifecycle operating cost of a power transformer. Addressing no-load losses (iron losses) requires moving beyond basic material grades and focusing on the mechanical precision of Cold-Rolled Grain-Oriented (CRGO) silicon steel processing.
H2: The Criticality of Shear Edge Precision The slitting and cutting phases directly impact core performance. When lamination burr heights exceed the standard threshold, mechanical and electrical failures compound:
- Interlaminar Shorting: Burrs greater than 0.02mm puncture the insulation coating (typically C-4 or C-5). This creates galvanic contact between lamination sheets.
- Thermal Runaway: The resulting short circuits generate localized eddy currents, leading to abnormal hot spots that degrade the surrounding oil or resin insulation.
- Stacking Factor Degradation: High burrs prevent flat lamination, reducing the stacking factor below the optimal 96%, thereby decreasing the effective magnetic cross-section.
Strict tooling calibration using tungsten carbide blades is the only physical method to lock burr heights below 0.02mm and maintain magnetic integrity.