Megger
TTRU3 True 3 Phase Transformer Turns Ratiometer

Megger TTRU3 True 3 Phase Transformer Turns Ratiometer

The Megger TTRU3 uses a revolutionary design to perform a complete series of measurements on a transformer. The 3Ø voltage output offers numerous advantages to testing with today’s busy schedules.

Measuring transformer turns ratio has long been an essential test for transformers; TTRU3 is designed to be portable and dependable in even harsh field-testing environments, at only 7kg it‘s both tough and lightweight. The unit comes complete with durable flexible leads for fast, safe and easy connection to any sized transformer built today.

Its 7 inch touchscreen is easy to see in both dark and full sun conditions (operates down to -20 °C). The display uses large icons guiding the operator to test any type of transformer, and at under 10 seconds per test you‘ll have more time in your busy day to manage other important things. The unit comes complete with a remote control which can be operated from your PC, as well as the ability to download results to a USB memory device.

The most impressive part of the TTRU3 is its accuracy; Megger‘s three-phase source gives results that you can trust and the collected data is easily saved or printed for convenient reporting.

▶ Video: Overview of The Megger TTRU3

Megger TTRU3 Key Features:

• Simple to use, only a quick guide is needed to begin testing
• 3Ø step up ratio (patent pending)
• 3Ø test voltage - up to 250V
• Fast 3Ø tests - less than 10 second
• Guaranteed accuracy ±0.05% from -20°C to +50°C
• Phase shifting and zig-zag transformers, tested easily and accurately
• Confirm expected nameplate vector configuration
• Ability to measure actual vs expected phase shift
• Unique kelvin clamps with adjustable 3-inch jaw
• Banana plug input for connection to terminal blocks
• Turns ratio % error vs nameplate with pass/fail
• PC interface via USB for remote control operation and downloading of test results
• Smallest/lightest 3Ø test set on the market

Megger TTRU3 - Safe Testing with Confidence

• All with one instrument and 3Ø lead-set connection!
• Ratio - 3Ø Step Up testing for power transformers
• Phase shift & phase deviation
• Polarity
• Magnetic balance/flux distribution
• Excitation current characteristics
• Auto vector detection/recognition

Typical problems found using the TTRU3:

• Loose connections
• Turn-to-turn shorts
• Broken Strands
• Winding deformation
• Tap changer contact problems
• Core problems

🧾 Megger TTRU3 Selection Guide

Megger TTRU3 Options:

• TTRU3-ADV – Compact entry-level unit with 125 V output and optional software features.
• TTRU3-PRO – Professional version with higher 250 V output and key accessories included.
• TTRU3-EXP – Fully featured expert model with every automation and software option enabled.

TTRU3-EXP includes all software options and will receive automatic activation of new features upon their release

❓ Frequently Asked Questions (FAQ)

Q1: What does the Megger TTRU3 do?

A. The Megger TTRU3 is a true 3-phase transformer turns ratiometer that measures transformer turns ratio, phase shift, polarity, and vector group in one connection. It provides fast, accurate assessment of a transformer’s electrical and mechanical condition.

Q2: What makes the Megger TTRU3 different from traditional ratio testers?

A. Unlike single-phase instruments, the Megger TTRU3 uses patented 3-phase step-up testing to check all three phases simultaneously in under 10 seconds. This eliminates internal relay switching and manual voltage selection, improving speed, reliability, and accuracy.

Q3: What transformer types can the Megger TTRU3 test?

A. It can test the following four transformer types (all without needing high-voltage excitation):

1) Power transformers 2) Distribution transformers 3) Instrument transformers (CTs and PTs) 4) Phase-shifting and zig-zag configurations

Q4: How accurate and safe is the Megger TTRU3?

A. The Megger TTRU3 guarantees ±0.05 % accuracy from -20 °C to +50 °C and complies with IEC 61010 safety standards. Built-in software performs safety checks before applying test voltage for operator protection.

Q5: Can results from the Megger TTRU3 be saved or exported?

A. Yes. Results can be viewed on the touchscreen, saved internally, exported via USB, printed using the optional printer, or imported into PowerDB for detailed reporting and analysis.