Active Part
Inspection

1. Core and Winding Inspection

At this stage, we verify the quality of the magnetic and electrical components under the requirements of IEC 60076-1. Our engineering focus includes:

• Material Verification: We check that the silicon steel and copper utilized by the manufacturer match the high-grade specifications defined in the contract.
• Core Assembly Audit: We scrutinize the core stacking process, verifying that laminations are perfectly aligned and free of burrs.
• Insulation and Grounding: Our engineers verify the "single-point" grounding of the core and inspect the windings for any insulation damage or core shorts that would be undetectable after final assembly.
• Thermal Compliance: We verify that the winding geometry and core assembly align with the design calculations to keep the unit within its specified thermal limits during operation.

2. Assembled Active Part Inspection

This is the most technically intensive milestone, where the core, windings, and lead structures are fully integrated. In accordance with IEC 60076-3, we perform a comprehensive audit of the internal electrical circuit:

• Design Alignment: We perform a verification of the connection diagram and vector group to confirm the unit is electrically identical to the approved design.
• Lead Routing and Bracing: We verify the mechanical bracing of high-voltage connections and audit the lead routing against dielectric clearance requirements.
• Mechanical Integrity: Our engineers verify the winding clamping pressure. We check that the windings are compressed to the exact engineering requirements to confirm the unit's short-circuit resilience.
• Connection Audit: We audit every brazed and crimped joint to detect potential "cold joints" or loose connections that could lead to thermal runaway.

3. Impact on Project Risk and Schedule

• Prevention of Latent Defects: By verifying compliance at these intermediate stages, we identify issues that are impossible to see once the unit is fully assembled.
• Schedule Protection: Detecting a ratio error or a clearance issue during the active part inspection allows for a 24-hour correction. Identifying the same non-conformity during final Factory Acceptance Tests (FAT) results in significant delays due to the necessity of de-tanking and re-drying.
• Technical Sovereignty: We provide an independent verification layer, confirming that the manufacturer adheres to the agreed standards and does not utilize production shortcuts that could compromise the 40-year lifespan of the asset.