Distribution Transformer Factory Inspection: What to Check
A factory inspection is your chance to see the transformer being built and to verify that what you specified is what is being manufactured. It is also where process quality, the part you cannot test for later, becomes visible.
This checklist covers what a buyer or inspector should look at.
A factory inspection is your chance to see the transformer being built and to verify that what you specified is what is being manufactured. It is also where process quality, the part you cannot test for later, becomes visible.
This checklist covers what a buyer or inspector should look at.
Before production
Confirm the approved drawings, the bill of materials, and the material certificates for core steel, conductor, insulation materials, oil or resin. Check that measurement and test equipment is calibrated.
During production
Core building. Lamination quality, step-lap stacking, burr control, core clamping
Winding. Conductor dimensions, insulation application, winding tension, bracing
Assembly. Clearances, lead routing, torque values, clamping
Drying and impregnation. Records of vacuum, temperature and duration
Tanking and finishing. Weld quality, surface preparation, paint system, accessory fitting
Quality records
Ask to see in-process inspection records and how non-conformities were handled and closed out. Traceability by serial number is a good sign of a controlled process.
During testing
Witness the routine tests if your contract allows it: winding resistance, ratio and vector group, impedance and load loss, no-load loss and current, dielectric tests, and functional checks of accessories.
Pre-shipment
Check nameplate data against the order, the completeness of documentation, the condition of bushings and accessories, protection for transport, packing and marking, and that lifting and handling instructions are visible.
Frequently Asked Questions
Related Products, Applications and Support
Not sure which rating fits your project? Send us your load list and we will size it for you, or email info@xsdfftransformer.com, call +86 158 6789 7761 or WhatsApp +852 5416 2620.