TRT Advanced Series True Three-Phase Transformer Turns Ratio Tester
True Three-Phase Transformer Turns Ratio Tester
Single-phase test voltages up to 500 V AC
True three-phase test voltages up to 3x290√3V AC
- Up to 5 kV AC with additional CVT20 for testing capacitive voltage transformers
The best turns ratio accuracy of 0.03%
Large 10.1” or 7” graphical touch screen display Automatic vector group detection
Built-in tap changer control unit
- Interchangeable test leads with Three-phase Winding Ohmmeters & Tap Changer Analyzers TWA Series
Description
TRT advanced series instruments are true three-phase, fully automatic test devices specially designed for turns ratio, phase shift, and excitation current measurements of power, distribution and instrument transformers. TRT advanced series instruments determine the transformer turns ratio by applying voltages across high voltage windings, accurately measuring voltages across the unloaded transformer windings, and then displaying the ratio of these voltages.
TRT advanced series instruments are based on a state of the art technology, using the most advanced technique available today. The test set can be used to test singlephase and three-phase transformers, both with and without taps in accordance with the requirements of the IEC 60076-1 standard.
For a three-phase measurement, the test set is connected to all the three phases of a transformer to be tested. If specific vector diagrams are selected for different types of transformers, the TRT will run a specific test for each transformer type (i.e., single phase, Delta to wye/ star, Wye/Star to delta, Delta to delta, Wye/Star to wye/
star, Delta to zig-zag,etc.) without a need to switch the test hookup cables. In addition, it can perform the test with true three-phase test voltage, allowing testing any transformer type. Following the test, it displays a turns ratio, phase shift, and excitation current obtained with single-phase and/or true three-phase test voltages.
TRT lets users enter a transformer’s nameplate voltages for the turns ratio deviation calculation. This feature eliminates any error otherwise caused by an operator’s manual calculation. The TRT also compares the test result with the nameplate ratio and prints out the % of error for each test.
Operating conditions messages or error messages identify incorrect test conditions, abnormal operating condition or transformer problems. TRT advanced series instruments have a very high ability to cancel electrostatic and electromagnetic interference in HV electric fields. It is achieved by a very efÏcient filtration. The filtration is made utilizing the proprietary hardware and software design solutions.
Application
The list of the instrument application includes:
- Turns ratio measurement
- Turns ratio deviation calculation
- Excitation current measurement
- Phase angle measurement
- Automatic vector group detection
- Verification of demagnetization process
- Magnetic balance test
Connecting TRT Advanced Series Instruments to Test Object
Three-Phase Transformer
Three-Phase Autotransformer
TRT is programmed to automatically test turns ratio, phase shift, and excitation current of power and distribution transformer types defined by CEI/IEC, IEEE, and ANSI standards. Using two sets of four cables, all bushings of the primary and the secondary sides are connected only once.
TRT advanced series instruments are also programmed to automatically test turns ratio, phase shift, and excitation current of autotransformer types defined by CEI/IEC, IEEE, and ANSI standards. Using two sets of four cables, all bushings of the primary and the secondary sides are connected only once.
Single-Phase Transformer
Although three-phase devices, TRT advanced series instruments are able to test single-phase transformers. Part of the cable set for three-phase transformers/ autotransformers can be used for this purpose.
Single-Phase Autotransformer
Although three-phase devices, TRT advanced series instruments are able to test single-phase autotransformers. Part of the cable set for three-phase transformers/ autotransformers can be used for this purpose.
Current Transformer
TRT advanced series instruments can also be used for verifying turns ratio and polarity of current transformers (CTs). CTs are specially constructed transformers – they are instrument transformers with only one, or occasionally two primary turns. Larger number of turns is on the “X” (secondary) side of CTs. For that reason, when verifying CTs, the “X” test cables must be connected to the primary of a CT. If there are no primary terminals, the “X” cables should be slid through the CT core and short-circuited.
Phase-Shifting Transformer
The presence of true three-phase test voltage allows TRT advanced series instruments to test any type of transformer, even those with irregular vector groups, including phase-shifting transformers.
Capacitive Voltage Transformer
When measuring turns ratio of capacitive voltage transformers (CVTs), test voltage of several kilovolts is required, much higher than available in common turns ratio testers. Together with Extension Transformer CVT20, TRT500 can output up to 5 kV AC, which is suitable for measuring turns ratio of CVTs. Polarity can be checked at the same time.
Benefits and Features
Single-Phase Test Voltage Up to 500 V AC
TRT advanced series instruments can output the highest single-phase test voltage of 500 V AC. This provides more accurate measurements on large power transformers and autotransformers used in power generation and transmission.
Automatic Vector Group Detection
TRT advanced series instruments are able to automatically detect vector group of three-phase transformers and autotransformers. This is possible both with and without PC software.
Tap Changer Control Unit
True Three-Phase Test Voltage
TRT advanced series instruments are true three-phase turns ratio testers. Unlike other so-called “three-phase” testers that allow only connecting to three transformer phases at once, TRT advanced series instruments also have the ability to output true three-phase test voltage, without any additional devices or modules. This allows testing any transformer type, including special designs such as phase shifting, arc furnace, rectifier transformers, etc. Besides measuring a turns ratio, it can also measure a voltage ratio of three-phase transformers. By applying true three-phase test voltage, and by measuring induced three-phase voltage, TRT advanced series instruments are able to determine actual phase shifts between HV and LV side voltages, and not just 0 or 180 degrees angle that is obtained by testing.
Test Voltage up to 5 kV AC
TRT500 has specially designed option for testing turns ratio of capacitive voltage transformers (CVTs). Because of their design, these transformers require several kilovolts over capacitive part in order to excite inductive part and obtain correct turns ratio. Together with Extension Transformer CVT20, TRT500 can output up to 5 kV AC.
TRT advanced series instruments have a built-in tap changer control unit, which allows remote on-load tap changer operation. A single operator can perform complete testing very quickly.
Large Graphical Touch Screen Display
TRT advanced series instruments come equipped with a large 10.1” (TRT500 model) or 7” (TRT400, TRT250, and TRT100 models) graphical touch screen display. This makes test preparation, test execution, and analysis of test results as easy as possible. Test template can be prepared and saved in the ofÏce, making the test execution in the field possible with only a few clicks. All test results are presented both numerically and graphically, for easy and convenient analysis.
Accuracy
The highest accuracy in the market, for all three parameters measured – turns ratio, excitation current, and phase angle – makes potential transformer irregularities and faults more visible.
Memory
TRT advanced series instruments have internal SD card of 8 GB memory space. This enables saving tens of thousands of results and test templates.
Interchangeable Cables with TWA
TRT advanced series instruments use the same cable set as Three-phase Winding Ohmmeter & Tap Changer Analyzer TWA series. This enables one-time cable setup for performing 8 tests: turns ratio, excitation current, phase angle, vector group detection, magnetic balance, winding resistance, OLTC DVtest, and demagnetization, thus making TRT advanced series instruments and TWA one measurement system.
Automated Test in Multiple OLTC Positions
Built-in tap changer control unit allows fully automated turns ratio test in multiple OLTC positions. TRT advanced series instruments are able to control the entire process of measurements and changing taps automatically.
Resolution
Magnetic Balance Test
This test helps in detecting possible problems in the transformer magnetic core. The test is completely automatic and requires no changes in cable setup comparing to turns ratio test. Results are presented both numerically and graphically.
USB Flash Drive
Built-in Printer
Built-in thermal printer, 112 mm (4.4 in) wide, is an optional accessory.
DV-Win Software
The DV-Win software is included in the purchase price, and all its updates are free of charge. The software allows full control of TRT advanced series instruments functions from a PC, creating and storing test templates. All results are presented both numerically and graphically, for an easy and convenient analysis. Test results can be directly exported to excel document. Customized test report can be generated, edited, saved in several file formats including pdf, and printed.
TRT Advanced Series Technical Data
Mains Power Supply
- Connection: according to IEC/EN60320-1; UL498, CSA 22.2
Display (TRT400, TRT250, TRT100)
- 7” graphical touch screen display
- Mains supply: 90 – 264 V AC, 50/60 Hz
- Input power: 250 VA
- Fuse: 2 A / 250 V, type F, not user replaceable
Interface
- Ethernet
- USB
Turns Ratio Measurement
- Range: 0.8 – 50 000
- Resolution: 5 digits
Internal Memory
- SD card 8 GB
- Typical accuracy:
Environmental Conditions
| @500, 430 & 250 V AC | @170, 100 & 80 V AC |
|---|---|
| 0.8 – 999: ±0.03% 1 000 – 3 999: ±0.05% | 0.8 – 999: ±0.05% 1 000 – 3 999: ±0.05% |
| 4 000 – 14 999: ±0.05% | 4 000 – 14 999: ±0.1% |
| 15 000 – 19 999: ±0.05% 20 000 – 50 000:±0.1% | 15 000 – 19 999: ±0.2% 20 000 – 50 000:±0.25% |
| @40 V AC | @10 & 8 V AC |
| 0.8 – 999: ±0.05% 1 000 – 3 999: ±0.1% 4 000 – 14 999: ±0.2% 15 000 – 20 000: ±0.3% | 0.8 – 999: ±0.05% 1 000 – 3 999: ±0.1% 4 000 – 15 000: ±0.2% |
| @1 V AC | |
| 0.8 – 999: ±0.05% 1 000 – 4 000: ±0.1% |
Excitation Current Measurement
- Range: 0 – 2 A
- Resolution: 0.0000 – 9.9999 mA 0.1 μA 10.000 – 99.999 mA 1 μA 100.00 – 999.99 mA 10 μA 1.0000 – 2.0000 A 100 μA
- Operating temperature:
- 10 ºC – +55 ºC / +14 ºF – +131 ºF
- Storage & transportation temperature:
- 40 ºC – +70ºC / -40 ºF – +158 ºF
- Humidity: 5% – 95% relative humidity, non-condensing
Dimensions and Weight (TRT500)
- Dimensions (W x H x D): 505 x 257 x 409 mm / 19.9 x 10.1 x 16.1 in
- Weight: 10.5 kg / 23.1 lbs
Dimensions and Weight (TRT400, TRT250, TRT100)
- Dimensions (W x H x D): 478 x 194 x 390 mm / 18.82 x 7.64 x 15.35 in
- Weight: 9 kg / 19.8 lbs
Warranty
- 3 years
- Typical accuracy: ±(0.25% rdg + 0.5 mA)
Printer (optional)
Phase Angle Measurement
- Range: 0 – 360º
- Resolution: 0.01º
- Built-in thermal printer
- Paper width 112 mm / 4.4 in
- Printer operating temperature: 0 ºC – +50 ºC / +32 ºF – +122 ºF
- Typical accuracy: ±0.05º
Test Voltages
- Printer density is guaranteed in this range: +5 ºC – +40 ºC / +41 ºF – +104 ºF 20 – 85% relative humidity, non-condensing
- TRT500: 1, 8, 10, 40, 80, 100, 170, 250, 430, 500 V AC
- TRT400: 1, 8, 10, 40, 80, 100, 170, 250, 430 V AC
- TRT250: 1, 8, 10, 40, 80, 100, 170, 250 V AC
- TRT100: 1, 8, 10, 40, 80, 100, 170 V AC
Applicable Standards
- Installation/Overvoltage category: II
- Pollution degree: 2
- Safety: LVD 2014/35/EU (CE Conform) Standard EN 61010-1:2010
Display (TRT500)
- 10.1” graphical touch screen display
- EMC: Directive 2014/30/EU (CE Conform) Standard EN 61326-1:2013
CVT20 Technical Data
Input Data
- Power supply: Only from associated TRT500 device, via provided connection cables
- Maximum input voltage: 250 V AC
- Frequency: 50/60 Hz
Output Data
- Maximum output voltage 5 kV AC
Environmental Conditions
- Operating temperature: -10 ºC – +55 ºC / +14 ºF – +131 ºF
- Storage & transportation temperature:
- 40 ºC – +70ºC / -40 ºF – +158 ºF
- Humidity: 5 % – 95 % relative humidity, non-condensing
Applicable Standards
- Installation/Overvoltage category: II
- Pollution degree: 2
Measurement
- Turns ratio range 20:1
- Turns ratio accuracy ±0.5% of ratio
- Safety: LVD 2014/35/EU (CE Conform) Standard EN 61010-1:2001
- EMC: Directive 2014/30/EU (CE Conform) Standard EN 61326-1:2006
- Maximum excitation capacity: 0.02 μF
Dimensions and Weight
- Dimensions (W x H x D): 223 x 260 x 284 mm 8.78 x 10.24 x 11.18 in
All specifications herein are valid at ambient temperature of + 25 °C and recommended accessories.
Specifications are subject to change without notice.
- Weight: 10 kg / 22 lbs
Accessories
TRT Advanced Series - Models
TRT500
The highest test voltage:Dimensions (W x H x D): 500 V AC 505 x 257 x 409 mm Up to 5 kV AC using external 19.9 x 10.1 x 16.1 in booster CVT20 Weight: Display size:10.5 kg 10.1”23.1 lbs
TRT400
The highest test voltage: 430 V AC Display size: 7”
Dimensions (W x H x D): 478 x 194 x 390 mm 18.82 x 7.64 x 15.35 in
Weight: 9 kg 19.8 lbs
TRT250
The highest test voltage: 250 V AC Display size: 7”
Dimensions (W x H x D): 478 x 194 x 390 mm 18.82 x 7.64 x 15.35 in
Weight: 9 kg 19.8 lbs
TRT100
The highest test voltage: 170 V AC Display size: 7”
Dimensions (W x H x D): 478 x 194 x 390 mm 18.82 x 7.64 x 15.35 in
Weight: 9 kg 19.8 lbs
Order info
| Instrument | Article No |
|---|---|
| True Three-phase Transformer Turns Ratio Tester TRT500 | TRT500X-N-01 |
| True Three-phase Transformer Turns Ratio Tester TRT400 | TRT400X-N-01 |
| True Three-phase Transformer Turns Ratio Tester TRT250 | TRT250X-N-01 |
| True Three-phase Transformer Turns Ratio Tester TRT100 | TRT100X-N-01 |
| Included accessories | |
|---|---|
| Windows-based DV-Win PC software | |
| USB cable | |
| Ethernet cable | |
| Tap changer control cable 5 m (16.4 ft) | |
| Mains power cable | |
| Ground (PE) cable | |
| Transport case | |
| Recommended accessories | Article No. |
| H winding test lead set, 4 x 10 m (32.8 ft) with TTA clamps (compatible with TWA and TRT series) | HC-10-4FMCWC |
| X winding test lead set, 4 x 10 m (32.8 ft) with TTA clamps (compatible with TWA and TRT series) | XC-10-4FFCWC |
| Cable plastic case – large size | CABLE-CAS-03 |
| Optional accessories | Article No |
|---|---|
| H winding test lead set, 4 x 5 m (16.4 ft) with TTA clamps (compatible with TWA and TRT series) | HC-05-4FMCWC |
| X winding test lead set, 4 x 5 m (16.4 ft) with TTA clamps (compatible with TWA and TRT series) | XC-05-4FFCWC |
| H winding test lead set, 4 x 15 m (49.2 ft) with TTA clamps (compatible with TWA and TRT series) | HC-15-4FMCWC |
| X winding test lead set, 4 x 15 m (49.2 ft) with TTA clamps (compatible with TWA and TRT series) | XC-15-4FFCWC |
| H winding test lead set, 4 x 20 m (65.6 ft) with TTA clamps (compatible with TWA and TRT series) | HC-20-4FMCWC |
| X winding test lead set, 4 x 20 m (65.6 ft) with TTA clamps (compatible with TWA and TRT series) | XC-20-4FFCWC |
| H winding cable extension set, 4 x 5 m (16.4 ft) (compatible with TWA and TRT series) | HE-05-4FMCFC |
| X winding cable extension set, 4 x 5 m (16.4 ft) (compatible with TWA and TRT series) | XE-05-4FFCMC |
| H winding cable extension set, 4 x 10 m (32.8 ft) (compatible with TWA and TRT series) | HE-10-4FMCFC |
| X winding cable extension set, 4 x 10 m (32.8 ft) (compatible with TWA and TRT series) | XE-10-4FFCMC |
| H winding cable extension set, 4 x 15 m (49.2 ft) (compatible with TWA and TRT series) | HE-15-4FMCFC |
| X winding cable extension set, 4 x 15 m (49.2 ft) (compatible with TWA and TRT series) | XE-15-4FFCMC |
| H winding test lead set, 4 x 5 m (16.4 ft) with TTA clamps (compatible with TRT series only) | HC-05-4TRTMW |
| X winding test lead set, 4 x 5 m (16.4 ft) with TTA clamps (compatible with TRT series only) | XC-05-4TRTFW |
|---|---|
| H winding test lead set, 4 x 10 m (32.8 ft) with TTA clamps (compatible with TRT series only) | HC-10-4TRTMW |
| X winding test lead set, 4 x 10 m (32.8 ft) with TTA clamps (compatible with TRT series only) | XC-10-4TRTFW |
| H winding test lead set, 4 x 15 m (49.2 ft) with TTA clamps (compatible with TRT series only) | HC-15-4TRTMW |
| X winding test lead set, 4 x 15 m (49.2 ft) with TTA clamps (compatible with TRT series only) | XC-15-4TRTFW |
| H winding test lead set, 4 x 20 m (65.6 ft) with TTA clamps (compatible with TRT series only) | HC-20-4TRTMW |
| X winding test lead set, 4 x 20 m (65.6 ft) with TTA clamps (compatible with TRT series only) | XC-20-4TRTMW |
| H winding cable extension set, 4 x 5 m (16.4 ft) (compatible with TRT series only) | HE-05-4TRTMF |
| X winding cable extension set, 4 x 5 m (16.4 ft) (compatible with TRT series only) | XE-05-4TRTFM |
| H winding cable extension set, 4 x 10 m (32.8 ft) (compatible with TRT series only) | HE-10-4TRTMF |
| X winding cable extension set, 4 x 10 m (32.8 ft) (compatible with TRT series only) | XE-10-4TRTFM |
| H winding cable extension set, 4 x 15 m (49.2 ft) (compatible with TRT series only) | HE-15-4TRTMF |
| X winding cable extension set, 4 x 15 m (49.2 ft) (compatible with TRT series only) | XE-15-4TRTFM |
| Cable plastic case – small size | CABLE-CAS-01 |
| Cable plastic case – medium size | CABLE-CAS-02 |
| Cable plastic case with wheels – medium size | CABLE-CAS-W2 |
| Cable plastic case with wheels – large size | CABLE-CAS-W3 |
| Transport case* | HARD-CASE-NC |
| Transport case with wheels* | HARD-CASE-NW |
| Transport case** | HARD-CASE-LC |
| Transport case with wheels** | HARD-CASE-LW |
| Plastic transport case** | HARD-CASE-PC |
| Plastic transport case with wheels** | HARD-CASE-PW |
| Built-in thermal printer 112 mm (4.4 in) | PRINT-112-00 |
| Thermal paper roll 112 mm (4.4 in) | PRINT-112-RO |
| Inverter 12 V DC to 230 V AC, 50 Hz | IN650-12-230 |
| Verification Calibrator TRTC | TRTC-05-4800 |
| H winding test lead set, 4 x 1 m (3.28 ft) with banana plugs | HC-01-4LMCBP |
| X winding test lead set, 4 x 1 m (3.28 ft) with banana plugs | XC-01-4LFCBP |
| Extension Transformer CVT20* | CVT20XX-N-00 |
| High voltage cable set 2 x 10 m (32.8 ft)* | CET-10-03EWC |
| High voltage cable set 2 x 15 m (49.2 ft)* | CET-15-03EWC |
| High voltage cable set 2 x 20 m (65.6 ft)* | CET-20-03EWC |
| H test cable set for connecting to TRT500, 2 x 5 m (16.4 ft)* | HET-05-2MCFC |
| Cable bag | CABLE-BAG-00 |
| TWA-TRT safety switchbox with ground cable | SWTCH-BOX-00 |
|---|---|
| H connection between instrument and switchbox, 4 x 0.8 m (2.62 ft) | HE-08-4FMCMC |
| X connection between instrument and switchbox, 4 x 0.8 m (2.62 ft) | XE-08-4FFCFC |
- *For TRT500 model
- **For TRT400, TRT250, TRT100 models