Transformer Testing
Understand transformer condition, verify performance and support confident commissioning decisions.
Explore ServiceMEGGER · TRAX
Megger TRAX Multifunction Transformer and Substation Test System
A portable multifunction test system for power transformers and substation assets, combining more than 20 electrical test functions in one configurable platform.
Official Megger product photography
Transformer and substation testing
Testing capabilities
- Winding resistance: up to 100 A true DC with 50 V compliance voltage
- Transformer turns ratio measurements with up to 250 V AC
- Adaptive transformer core demagnetisation
- Dynamic resistance measurements for on-load tap changers
- Power factor / tan delta and dielectric diagnostics with optional TDX120 accessory
- Circuit breaker timing, coil current and pre-insertion resistance testing
- App-based interface, manual control and test data export
Manufacturer-published capabilities. Available tests depend on the selected configuration and accessories. Confirm suitability, availability and pricing with our technical team.
Technical specifications
| Manufacturer / model | Megger / TRAX |
| Input voltage | 100–240 V AC, 50/60 Hz (±10%) |
| Maximum DC output current | 100 A for 2 minutes; 70 A continuous |
| DC compliance voltage | 50 V for winding resistance measurements |
| Turns ratio test voltage | Up to 250 V AC |
| Dielectric testing | Up to 12 kV with optional TDX120 accessory |
| Manual control | 10 AC/DC generators and 6 measurement channels |
| Configuration | Available functions depend on selected model, accessories and test setup |
Downloads
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Why transformer testing matters throughout the asset lifecycle
From commissioning to preventive maintenance, a structured testing program helps build a clearer picture of transformer condition.
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What circuit breaker timing tells you about switching performance
Timing, contact resistance and coil current measurements help form a more complete picture of breaker performance.
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