Three-phase transformer turns ratio tester with a touch screen and extended test voltage
The TRT Advanced series verifies the turns ratio, phase shift and excitation current of power, distribution and instrument transformers, with or without a tap changer, under IEC 60076-1.
Advantages
Single-phase test voltage up to 500 V AC
TRT500 reaches 500 V AC, the highest in the range, for the best accuracy on large power transformers; TRT400, TRT250 and TRT100 cover 430, 250 and 170 V AC.
Extension to 5,000 V AC for capacitive voltage transformers
With the CVT20 auxiliary transformer, TRT500 also verifies capacitive voltage transformers, a test that requires several kilovolts and that the Standard range does not cover.
Test templates and automatic mode on the screen itself
The 7 or 10.1 inch touch screen stores test templates and runs the automatic mode across multiple tap-changer positions, a function previously available only from the PC.
Extended memory and Ethernet connection
A 32 GB SD card stores tens of thousands of results and templates, and the interface adds Ethernet alongside the standard USB port.
Applications
- Commissioning and maintenance of power, distribution and instrument transformers, with or without a tap changer.
- Testing of capacitive voltage transformers with TRT500 and the CVT20 auxiliary transformer.
- Testing of special transformers - phase-shifting, rectifier and arc-furnace units - with true three-phase test voltage.
- Field maintenance rounds using test templates stored beforehand in the instrument itself.
About the product
The range comprises four models - TRT500, TRT400, TRT250 and TRT100 - which share the 0.8 to 50,000 ratio range and automatic vector group detection, and differ in maximum test voltage and screen size, 10.1 inches on TRT500 and 7 inches on the rest.
All four include remote tap-changer control, 32 GB of internal memory and a USB and Ethernet interface; the DV-TR software creates test templates and exports results to spreadsheet or PDF. Accessories available: H and X cable sets in several lengths, transport cases, TRTC verification calibrator, built-in thermal printer and, for TRT500, the CVT20 auxiliary transformer.
Technical specifications
| Models | TRT500, TRT400, TRT250 and TRT100 |
| Test voltage source | Single-phase and true three-phase |
| Maximum test voltage | 500/430/250/170 V AC (TRT500/400/250/100) |
| Turns ratio range / accuracy | 0.8 - 50,000; from ±0.03% |
| Display | Touch screen, 10.1 in (TRT500) or 7 in (rest) |
| Internal memory | 32 GB SD card |
| Interface | USB and Ethernet |
| Dimensions and weight | 505×257×409 mm, 10.5 kg (TRT500); 478×194×390 mm, 9 kg (rest) |
Frequently asked questions
What is the practical difference between the four Advanced series models?
Mainly the maximum test voltage - 170, 250, 430 and 500 V AC on TRT100, TRT250, TRT400 and TRT500 - and screen size, larger on TRT500.
How are capacitive voltage transformers tested?
By connecting the CVT20 auxiliary transformer to TRT500, which raises the test voltage up to 5,000 V AC.
Is the PC software needed to automate testing across multiple tap-changer positions?
No: the touch screen already includes test templates and an automatic mode that steps through the positions without manual intervention.
Can the same leads be used as the TWA winding analyzer?
Yes: TRT Advanced shares its H and X leads with the TWA, so a single connection to the bushings covers the ratio test, winding resistance, DVtest and demagnetization.
