Automatic Three Phase Transformer Turns Ratio Tester TTR Meter Portable Transformer Ratio Group Test Equipment

Special Transformer Ratio Tester is an independently developed fully automatic bench-top transformer testing instrument. It is mandatory equipment for transformer factory inspection, handover acceptance and maintenance tests.

It is the tester supporting full blind test: it can accurately measure transformation ratio, connection vector group and phase angle. Compatible with all types of special and general transformers including Z-type, rectifier, furnace, phase-shifting, balancing, Scott & inverse Scott transformers. It effectively detects inter-turn short circuit, winding open circuit, wrong wiring and poor contact of tap changers.

Built-in high-capacity lithium battery enables field testing without external mains supply. Equipped with complete short-circuit & overload automatic protection system. It adopts a 5-inch high-definition true-color touch screen with intuitive hexagonal vector diagram display. A built-in thermal printer is provided for on-site report printing. Up to 1000 groups of test data can be stored and exported to PC via USB for report generation.

1. Genuine 3-Phase Synchronous Test

   Single-phase input, internally digitally synthesized low-distortion 3-phase standard sine wave source (distortion <0.1%, symmetry better than 0.05%) to avoid vector group misjudgment. Switchable single/3-phase mode; synchronously test polarity, phase angle, 3-phase ratio, error and tap position, auto identify all vector groups 0–11.

2. Full Blind Test without Wiring Pre-setting

   No need to pre-select connection group; no external short circuit required for Y/△ & △/Y transformers. Directly test unknown transformers without nameplates, with auto circuit switching.

3. High-Precision Phase Angle Measurement

   0~360° measurement range, 0.01° resolution, ±0.1° accuracy. Accurately test non-integer phase-shifting transformers with visual hexagonal vector diagram for wiring verification.

4. Batch Tap Changer Test

   Only input rated ratio once; the unit automatically calculates ratio errors for all tap positions to quickly check tap changer performance.

5. Dual Ratio Measurement Modes

   Supports turns ratio and operating voltage ratio measurement; operating ratio reflects real voltage transformation under actual load conditions.

6. Portable Lithium Battery Power Supply

   Built-in high-capacity lithium battery supports over 500 consecutive full tests after single full charge, unrestricted for power-free field sites.

7. Complete Data Management

   Stores up to 1000 test records with power-off protection; export data to computer via USB to generate test reports. Built-in high-speed thermal mini printer for instant on-site printing.