Used same in China

Verify nameplate data (ratio, class, burden, insulation level), calibration and test reports, physical condition, and history of overloads or faults. Confirm standards compliance and whether secondary terminals and accessories match your protection/metering equipment.

Request recent accuracy and insulation test certificates, lightning impulse and routine test results, and evidence of IEC/ANSI class ratings. For protection CTs, confirm T‑class or accuracy at specified fault currents and verify secondary burden compatibility.

Securely brace units to prevent movement, protect bushings and terminals, and use moisture barriers for oil-filled types. Follow carrier rules for heavy loads, declare oil-filled equipment and hazardous materials if applicable, and insure for transport damage.

Inspect for shipping damage, verify insulation and continuity, perform ratio and polarity checks, and run insulation resistance and power-frequency / excitation tests. For oil-filled units, sample oil and check for moisture and dielectric strength. Recalibrate as needed per manufacturer recommendations.