The Megger MTO106 Transformer Ohmmeter is a compact, user-friendly instrument tailored for accurate field measurement of winding resistance in smaller transmission and distribution transformers, reactors, and instrument transformers. With dual channels delivering up to 6 A DC, it measures resistances from 10 µΩ to 30 kΩ with ±0.25% accuracy, verifying factory readings, supporting maintenance programs, and detecting defects like poor connections or tap changer issues. Its 48 V test voltage ensures rapid transformer saturation, while automatic passive discharge circuitry de-energizes windings safely after each test, even during power loss.
Weighing only 7.3 kg and housed in an IP67-rated case, it’s highly portable, with 10 m test leads fitted with Kelvin clamps for easy single-connection testing, including pole-mounted transformers. The multimeter-style interface, featuring a single selector switch and test button, minimizes training needs, and a 4-inch backlit display ensures clear results in varied conditions. Operating reliably from -20°C to 50°C, it’s built for high-voltage substations and industrial environments. Included accessories like a 5 m ground lead and carry bag, plus optional dual-channel lead sets, enhance versatility, making the MTO106 an essential tool for engineers ensuring transformer reliability and preventing costly failures in power systems.
