Megger TAU3 Three-Phase Analyser
- Designed for Transformer Winding analysis
The multifunction TAU3 simplifies transformer testing with a single connection for all tests, reducing equipment needs and saving time. It performs polarity validation, turns ratio, winding resistance, demagnetisation, short-circuit impedance, and efficiency tests with ease. Color-coded leads, clamps, and on-screen vectors ensure accurate setup, delivering the right result the first time - just click ‘start‘ and let the patent-pending technology handle the rest!
On-screen vectors ensure accurate setup:

Megger TAU3 Key Features:
- True three-phase testing – No lead changes, saving time and enhancing safety
- Turns ratio – Up to 62.5 V, ±0.10% accuracy
- Winding resistance – Up to 10 A, ±0.2% accuracy
- Adaptive demagnetisation – Prevents protection system trips
- Vector validation – Auto confirmation before every test
- Wide operating temperature – Accuracy assured from -20°C to 50°C
- One-time lead connection – Faster, safer testing with reduced ladder climbs
- Smart user interface – Ensures quick, accurate results with minimal input
- Portable design – Compact, wheeled, and watertight case for field use
Megger TAU3: The Ultimate Transformer Testing Solution
This unit simplifies transformer diagnostics! The three-phase switched source, enables:
- Turns ratio testing
- Winding resistance testing
- Demagnetisation testing
With a one-time connection, users eliminate repeated lead changes, making testing safer and more efficient. Colour-coded leads, extendable clamps, and on-screen vector guides ensure accuracy on the first attempt.
Simply connect and press start!
Megger TAU3: The Ultimate Transformer Testing Solution
- Reduces time on transformer tops by eliminating repeated ladder climbs
- Key lock, safety interlock, and emergency stop ensure safe testing
- Shock-mounted electronics in a lightweight, portable casing enhance durability
Advanced Transformer Assessment with Megger TAU3
- Find Vector and Polarity Recognition – Auto vector validation prevents costly errors
- Magnetic Balance Test – Quickly assess core health and flux distribution
- Phase Angle Deviation – Detect core and winding faults with high precision
- Excitation Current Testing – Identify insulation and winding defects effortlessly
- OLTC Diagnostics – Verify make-before-break continuity in tap changers
- Dynamic Resistance Measurement – Gain deeper insights into tap changer performance
Seamless Data Integration
- Microsoft Excel and PowerDB compatibility for streamlined reporting
- USB printer support for immediate result documentation
- External temperature probe for enhanced test accuracy*
Comprehensive Transformer Fault Detection
The Megger TAU3 identifies issues such as loose connections, broken strands, winding deformation, and core problems. Its diagnostic mode pinpoints faults with high accuracy, allowing targeted maintenance and reducing downtime.
Maximise Productivity with Megger TAU3
- Eliminate costly errors – Automatic vector verification enhances test accuracy
- Work faster and safer – One-time lead connection reduces testing time
- Uncover hidden faults – Comprehensive transformer analysis in a single device
Are you ready to upgrade your transformer maintenance strategy? The Megger TAU3 is your all-in-one solution for fast, accurate, and reliable transformer diagnostics.
What comes with the Megger TAU3?
- Megger TAU3 Three-phase transformer winding analyser
- (1014-927) AC Power cords
- USB 2.0 Cable CA-USB
- (1011-622) OLTC Tap changer cable
- (2012-180) Cable bag – backpack
- (4702-7) Ground lead 4.5 m (15 ft)
- (90012-878) USB drive
Please note the moulded plastic trolley-case shown in the photos is an optional accessory:
