Tettex TTR 2796 Three Phase Transformer Turns Ratio Meter

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Transformer Turn Ratio (TTR)

Tettex TTR 2796 Three Phase Transformer Turns Ratio Meter provides better transformer excitation due to higher test voltage of 250V. The Tettex TTR 2796 helps to detect faulty transformer windings as well as defective tap changer positions. The simple ratio of turns or voltage and the related ratio error is not sufficient to detect all possible failures of a power transformer winding. The excitation current and the phase angle between primary and secondary windings give additional information about the winding condition. The TTR 2795 provides all these measurements in one compact instrument.

The Tetter TTR 2795 measures turns ratio with the highest accuracy in the industry and has one of the largest turns ratio ranges commercially available. This advanced transforer turn ratio meter automatically recognizes winding connections and vector group numbers of transformer windings. Testing is simplified by just connecting the measuring cables and press the start button.

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Features

Fully automated measurement of turns ratio, voltage ratio, phase displacement, and excitation current.
Better transformer excitation due to higher test voltage of 250V.
Highest accuracy on the market - up to 0,03%.
Ratios of up to 50’000 can be measured
Measurement of phase displacement of transformers with irregular vector groups like: phase shifting, rectifier, arc-furnace and traction transformers.
Automatic Winding Connection Identification (AWCI) and automatic vector group detection supports quick and easy operation.
Quick setup with intuitive guide-through user interface. Test setups and results can be stored and recalled, printed out with the built-in printer or used for later analysis.
Lightweight, rugged and compact design allows use in harsh environment (field proof). Closed case is IP65 waterproof, open case is splash proof.
Safety connection control feature proofs test setup before applying regular test voltage to guarantee safety of the personnel and instrument.
Free external application software allows data exchange and advanced analysis of results on a computer (USB connection) including automatic report generation.
Remote tap changer switch enables convenient testing of multi-tap transformers.

Specifications

General
Excitation voltage	2.5 V, 25 V, 100 V and 250 V; automatic or manual selectable
Excitation current	max. 1 A
Display	5.2” dot matrix LCD 240x128 module with backlight
Memory	Stores up to 100 complete test results / test setups
Printer	Thermal strip printer, paper width 58mm
Interfaces
Computer:	USB 2.0 client (with supplied adapter)
Tap changer:	3 pole contact in/out (potential free)
Operating temperature	- 10°C* … 55°C * - 10°C typical, - 5°C guaranteed
Storage temperature	- 20°C … 70°C
Humidity	5 .. 95 % r.h. non-condensing
Mains	95 … 240 V AC, 50/60 Hz, max. 1.3 A
Dimension (L x W x D)	41 cm x 31 cm x 17 cm (16” x 12.2” x 7”)
Weight	8.8 kg (19 lbs) excl. cables

Applications

Turns ratio, voltage ratio, phase displacement and excitation current measurements according to ANSI, IEC and Australian standards on:

Power Transformers
Distribution Transformers
Special transformers
- Phase shifting transformers
- Rectifier Transformers
- Arc-furnace Transformers
- Traction Transformers.
Instrument Transformers

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Tettex TTR 2796 Three Phase Transformer Turns Ratio Meter

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