Instrument Transformer FAT Checklist

Instrument Transformer FAT Checklist

Instrument transformers are small compared with switchgear, but CT/VT mistakes propagate into metering and protection problems. A structured FAT verifies that CTs and VTs match your specification before shipping.

This checklist can be used as a practical FAT template for CT/VT procurement.

1) Nameplate and Specification Match

• ratio and secondary rating (1A/5A for CT; secondary voltage for VT)
• accuracy class (metering vs protection)
• burden rating
• insulation level and voltage class
• terminal markings and polarity

2) Visual Inspection

• housing integrity, cleanliness, and damage checks
• terminal condition and labeling
• mounting features and accessories included

3) Routine Electrical Tests (Per Standard)

• insulation tests appropriate to rating
• ratio verification
• polarity checks (CT)
• functional checks for multi-ratio taps (if applicable)

4) Documentation Package

• test reports with serial number traceability
• drawings or terminal diagrams
• operation/installation instructions
• packing list and spares list (if required)

Internal Links

CT products: Current Transformers.

VT products: Voltage Transformers.

Project inquiries: Contact Us.

Conclusion

A CT/VT FAT checklist reduces commissioning surprises. Verify nameplate fields, run routine tests aligned with the governing standard, and require traceable test reports. These steps protect both billing accuracy and protection reliability.

Image Suggestions

• Image: https://www.enweielectric.com/products/current-transformers
• ALT: "Factory acceptance testing checklist for current transformers"
• Image: https://www.enweielectric.com/products/voltage-transformers
• ALT: "Factory acceptance testing checklist for voltage transformers"