Complete Transformer Testing Services in Pakistan.
TransfoLine provides end-to-end diagnostic testing for power and oil distribution transformers (25 KVA to 8000 KVA) across industrial plants, substations, and grid networks in Pakistan. Utilizing calibrated test sets from Megger, Omicron, and Fluke, our certified engineers perform comprehensive physical, electrical, and chemical diagnostics to guarantee asset reliability and compliance with IEC 60076 standards.
What is Transformer Testing?
Transformer testing is an essential engineering procedure combining electrical, dielectric, magnetic, and thermal diagnostics to assess the internal health, winding geometry, ratio accuracy, and oil quality of power and distribution transformers. It verifies that new, refurbished, or in-service transformers withstand operational electrical stresses without failure or unexpected tripping.
The 10 Diagnostic Tests We Perform
Testing Frequency & Recommended Actions
| Test Name | Primary Purpose | Recommended Interval | Trigger for Action |
|---|---|---|---|
| Insulation Resistance (IR) | Detect moisture, carbonization & aging | Annual / Pre-commissioning | < 100 MΩ or PI < 1.5 |
| Turns Ratio (TTR) | Identify shorted turns & ratio error | Commissioning / After trip | Deviation > ±0.5% |
| Oil Dielectric BDV | Measure oil insulation strength | Every 6 to 12 months | < 35 kV breakdown |
| Winding Resistance | Detect loose joints & tap wear | Every 2 years / Pre-commission | > 2% phase unbalance |
| SFRA Analysis | Check core/winding mechanical shift | After heavy fault / relocation | Curve deviation from baseline |
Frequently Asked Questions.
Clear answers regarding transformer testing from our engineering staff.
FREQUENCY How often should an industrial transformer be tested?
We recommend annual insulation resistance and oil BDV testing for distribution units, and 6-monthly oil analysis for large power transformers (500+ KVA) operating under high industrial load.
ON-SITE Can you test large transformers without removing them?
Yes. Our senior testing engineers bring fully calibrated portable test equipment directly to your site, executing all electrical, dielectric, and oil tests without removing the transformer.
REPAIR What if a transformer fails the test?
TransfoLine operates a dedicated 18-year transformer manufacturing and repair facility. If your unit shows low oil BDV, we perform on-site oil dehydration; if windings are degraded, we offer complete rewinding and warranty repair.
Book a Transformer Test.
Schedule on-site diagnostics or request quote within 2 hours.
Need immediate transformer diagnosis, oil testing, or pre-commissioning testing? Contact us directly.