Quality control check sheets for VPI transformer manufacturing

Verify the delivery of raw materials against the purchase order

Inspect insulation materials for compliance with specifications

Check copper and aluminum conductors for quality and specifications

Confirm the certification of any purchased components (e.g., bushings, circuit breakers)

Ensure proper cutting and shaping of insulation materials

Verify the cleanliness of conductors before winding

Inspect all components for damage before assembly

Check winding machine calibration and settings

Monitor winding tension throughout the process

Inspect the winding for uniformity and consistency

Document the number of turns and layer counts

Confirm proper setup of the VPI (Vacuum Pressure Impregnation) system

Monitor temperature and pressure during the impregnation cycle

Inspect the quality of the resin used for compliance with specifications

Ensure proper curing time is observed post-impregnation

Verify alignment and fit of all assembled parts

Check for proper connection and termination of leads

Inspect mechanical fasteners for tightness and compliance with torque specifications

Conduct electrical tests (e.g., insulation resistance, power factor)

Perform routine electrical tests (e.g., primary and secondary voltage tests)

Conduct temperature rise tests under load conditions

Verify operational performance against design specifications

Document all test results and compare with acceptance criteria

Inspect packaging materials for quality and suitability

Ensure transformers are secured properly for transport

Confirm labeling and documentation is complete and accurate

Conduct a final visual inspection before shipping

Review quality control data and reports for trends

Identify areas for improvement based on inspection outcomes

Implement corrective actions and preventive measures as needed

Schedule regular training for staff on quality control standards and procedures