Amperis presents the transformer turns ratio meters of the TRT03, TRT3x, TRT4x and TRT63 series, built on state-of-the-art technology using the most advanced technique available today. They are automatic, three-phase instruments designed to measure:
- the turns ratio of the windings
- the phase angle shift
- the excitation current of power and distribution transformers
The TRT applies voltages across the high-voltage windings and accurately measures the voltages across the unloaded transformer windings in order to determine the transformer turns ratio.
The DV-Win software lets you configure the test and create test plans in advance. All results are shown numerically and graphically for easy analysis, and a 112 mm thermal printer can be supplied with the instrument. Every TRT comes with a USB flash drive to transfer the results and with a tap changer control unit, which allows remote tap changing and measurement of the tap changer ratio.
In accordance with the requirements of IEC 60076-1, the test set can be used on single-phase and three-phase transformers, with and without a tap changer. For a three-phase measurement it is connected to the three phases of the transformer. The TRT range runs a specific test for each transformer type once the corresponding vector diagrams are selected (delta-wye, wye-delta, delta-delta, wye-wye, delta-zigzag and so on), with no need to change the test leads. When the test finishes it displays the turns ratio, the phase shift and the excitation current.
To calculate the turns ratio deviation, the nameplate voltages can be entered directly, which removes possible operator calculation errors. The TRT also compares the test result with the nameplate ratio and prints the percentage error for each test.
Incorrect test conditions, transformer problems or abnormal operation are detected through error messages. A notable feature of the Amperis TRT instruments is their high ability to cancel electrostatic and electromagnetic interference in high-voltage electric fields, thanks to very efficient filtering.
Applications
- Turns ratio measurement
- Calculation of the turns ratio deviation
- Excitation current measurement
- Phase angle measurement
- Automatic vector group detection
- Verification of the demagnetisation process
- Magnetic balance test
Advantages
- Accuracy: the highest accuracy on the market, which makes transformer irregularities more visible.
- Resolution: high measurement resolution allows better tracking of the current trend.
- Automatic vector group detection on three-phase transformers and autotransformers, with and without software.
- DV-Win software: numerical and graphical results, simplified analysis from a PC in an Excel sheet and reports that can be customised in several formats.
- Automatic magnetic balance test to detect possible problems in the transformer magnetic core, with no configuration changes.
- Memory: stores 200 records with 50 test readings each, exportable over USB.
- Built-in tap changer control unit, which allows remote operation.
- Optional thermal printer.
Available models
TRT03
TRT03 series: generates a single-phase test voltage.
| TRT03A | TRT03B | TRT03C | |
|---|---|---|---|
| Test voltages | (8,40,100) V AC 3x(8,40,100)√3 V AC | (10,40,100) V AC 3x(10,40,100)√3 V AC | (8,40,80) V AC 3x(8,40,80)√3 V AC |
| Ratio range | 0.8 to 15,000 (5-digit resolution) | 0.8 to 15,000 (5-digit resolution) | 0.8 to 15,000 (5-digit resolution) |
| Best ratio accuracy | 0.05 % | 0.05 % | 0.05 % |
| Excitation current range | 0 – 2 A | 0 – 2 A | 0 – 2 A |
| Excitation current accuracy | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) |
| Best excitation current resolution | 0.1 µA | 0.1 µA | 0.1 µA |
| Phase angle range | 360 degrees | 360 degrees | 360 degrees |
| Phase angle accuracy | ±0.05 degrees | ±0.05 degrees | ±0.05 degrees |
| Phase angle resolution | 0.01 degrees | 0.01 degrees | 0.01 degrees |
| USB drive | Yes | Yes | Yes |
| Built-in tap changer control | Yes | Yes | Yes |
| Built-in thermal printer | Optional | Optional | Optional |
TRT30
TRT30 series: provides true three-phase and single-phase voltages.
| TRT30A | TRT30B | TRT30C | |
|---|---|---|---|
| Test voltages | (8,40,100) V AC 3x(8,40,100)√3 V AC | (10,40,100) V AC 3x(10,40,100)√3 V AC | (8,40,80) V AC 3x(8,40,80)√3 V AC |
| Ratio range | 0.8 to 15,000 (5-digit resolution) | 0.8 to 15,000 (5-digit resolution) | 0.8 to 15,000 (5-digit resolution) |
| Best ratio accuracy | 0.05 % | 0.05 % | 0.05 % |
| Excitation current range | 0 – 2 A | 0 – 2 A | 0 – 2 A |
| Excitation current accuracy | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) |
| Best excitation current resolution | 0.1 µA | 0.1 µA | 0.1 µA |
| Phase angle range | 360 degrees | 360 degrees | 360 degrees |
| Phase angle accuracy | ±0.05 degrees | ±0.05 degrees | ±0.05 degrees |
| Phase angle resolution | 0.01 degrees | 0.01 degrees | 0.01 degrees |
| USB drive | Yes | Yes | Yes |
| Built-in tap changer control | Yes | Yes | Yes |
| Built-in thermal printer | Optional | Optional | Optional |
TRT33
TRT33 series: adds a 1 V AC test voltage, required for current transformer testing.
| TRT33A | TRT33B | TRT33C | |
|---|---|---|---|
| Test voltages | (1,8,40,100) V AC 3x(1,8,40,100)√3 V AC | (1,10,40,100) V AC 3x(1,10,40,100)√3 V AC | (1,8,40,80) V AC 3x(1,8,40,80)√3 V AC |
| Ratio range | 0.8 to 15,000 (5-digit resolution) | 0.8 to 15,000 (5-digit resolution) | 0.8 to 15,000 (5-digit resolution) |
| Best ratio accuracy | 0.05 % | 0.05 % | 0.05 % |
| Excitation current range | 0 – 2 A | 0 – 2 A | 0 – 2 A |
| Excitation current accuracy | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) |
| Best excitation current resolution | 0.1 µA | 0.1 µA | 0.1 µA |
| Phase angle range | 360 degrees | 360 degrees | 360 degrees |
| Phase angle accuracy | ±0.05 degrees | ±0.05 degrees | ±0.05 degrees |
| Phase angle resolution | 0.01 degrees | 0.01 degrees | 0.01 degrees |
| USB drive | Yes | Yes | Yes |
| Built-in tap changer control | Yes | Yes | Yes |
| Built-in thermal printer | Optional | Optional | Optional |
TRT40
TRT40 series: maximum test voltage of 125 V AC. With the CVT40 extension it can reach up to 5 kV AC.
| TRT40A | |
|---|---|
| Test voltages | (8,40,125) V AC 3x(8,40,125)√3 V AC |
| Ratio range | 0.8 to 15,000 (5-digit resolution) |
| Best ratio accuracy | 0.05 % |
| Excitation current range | 0 – 2 A |
| Excitation current accuracy | ±(0.25 % + 500 µA) |
| Best excitation current resolution | 0.1 µA |
| Phase angle range | 360 degrees |
| Phase angle accuracy | ±0.05 degrees |
| Phase angle resolution | 0.01 degrees |
| USB drive | Yes |
| Built-in tap changer control | Yes |
| Built-in thermal printer | Optional |
TRT43
TRT43 series: adds the 1 V AC test voltage for current transformer testing and, with the CVT40 extension, reaches up to 5 kV AC output.
| TRT43A | |
|---|---|
| Test voltages | (1,8,40,125) V AC 3x(1,8,40,125)√3 V AC |
| Ratio range | 0.8 to 15,000 (5-digit resolution) |
| Best ratio accuracy | 0.05 % |
| Excitation current range | 0 – 2 A |
| Excitation current accuracy | ±(0.25 % + 500 µA) |
| Best excitation current resolution | 0.1 µA |
| Phase angle range | 360 degrees |
| Phase angle accuracy | ±0.05 degrees |
| Phase angle resolution | 0.01 degrees |
| USB drive | Yes |
| Built-in tap changer control | Yes |
| Built-in thermal printer | Optional |
TRT63
TRT63 series: the most advanced, with the highest test voltage, 250 V AC (about 430 V AC phase to phase). It offers the best ratio accuracy and the widest ratio range. Its leads are interchangeable with those of the TWA40D.
| TRT63A | TRT63B | TRT63C | |
|---|---|---|---|
| Test voltages | (1,8,40,100,250) V AC 3x(1,8,40,100,250)√3 V AC | (1,10,40,100,250) V AC 3x(1,10,40,100,250)√3 V AC | (1,8,40,80,250) V AC 3x(1,8,40,80,250)√3 V AC |
| Ratio range | 0.8 to 50,000 (5-digit resolution) | 0.8 to 50,000 (5-digit resolution) | 0.8 to 50,000 (5-digit resolution) |
| Best ratio accuracy | 0.03 % | 0.03 % | 0.03 % |
| Excitation current range | 0 – 2 A | 0 – 2 A | 0 – 2 A |
| Excitation current accuracy | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) | ±(0.25 % + 500 µA) |
| Best excitation current resolution | 0.1 µA | 0.1 µA | 0.1 µA |
| Phase angle range | 360 degrees | 360 degrees | 360 degrees |
| Phase angle accuracy | ±0.05 degrees | ±0.05 degrees | ±0.05 degrees |
| Phase angle resolution | 0.01 degrees | 0.01 degrees | 0.01 degrees |
| USB drive | Yes | Yes | Yes |
| Built-in tap changer control | Yes | Yes | Yes |
| Built-in thermal printer | Optional | Optional | Optional |
Accessories
TRTC verification calibrator
An optional accessory that can be used as a reference transformer to check the accuracy of the TRT three-phase turns ratio meter. It is available for single-phase or three-phase testing, with ratios up to 4,800 and test voltages from 1 V to 250√3 V.
CVT40 extension transformer
The CVT40 is an extension transformer used together with the Amperis TRT4x series to test capacitive voltage transformers. With this extension the TRT4x output voltage is multiplied by 40, up to 5 kV AC.
More information
Amperis Products S.L. — Electrical instrumentation. Write to info@amperis.com or call +34 982 20 99 20.