Specially designed option for testing capacitive voltage transformers
Test voltages from 1 to 125 V AC
Up to 5 kV AC with additional CVT40
Turns ratio range 0,8 – 50 000
The best turns ratio accuracy of 0,05%
Single-phase test voltage
True three-phase test voltage
Automatic vector group detection
Detailed analysis of test results using DV-Win software
Interchangeable test leads with Three-phase Winding Ohmmeters & Tap Changer Analyzers TWA
TRT4x is a true three-phase, fully automatic test set specially designed for turns ratio, phase shift, and excitation current measurements of power, distribution and instrument transformers. TRT4x determines 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.
TRT4x is based on a state of the art technology, using the most advanced technique available today. The test set can be used to test single-phase 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 TRT4x 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 tests.
TRT4x 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 TRT4X 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. TRT4x has a very high ability to cancel electrostatic and electromagnetic interference in HV electric fields. It is achieved by a very efficient filtration. The filtration is made utilizing the proprietary hardware and software design solutions.
Mains Power Supply
Connection: according to IEC/EN60320-1; UL498, CSA 22.2
Mains supply: 90 – 264 V AC, 50/60 Hz or 110 – 350 V DC
Input power: 250 VA
Fuse: 2 A / 250 V, type F, not user replaceable
Output Data
Instrument / Test voltages
| TRT40A | 8, 40, 125 V AC 3 x (8, 40, 125)√ 3 V AC |
| TRT43A | 1, 8, 40, 125 V AC 3 x (1, 8, 40, 125)√3 V AC |
Measurement
Turns ratio measuring range: 0,8 – 50 000
Turns ratio resolution: 5 digits
Typical turns ratio accuracy:
@125 V AC | @40 V AC |
0,8 – 999: ±0,05% | 0,8 – 999: ±0,05% |
1 000 – 3 999: ±0,05% | 1 000 – 3 999: ±0,1% |
4 000 – 14 999: ±0,1% | 4 000 – 14 999: ±0,2% |
15 000 – 19 999: ±0,2% | 15 000 – 20 000: ±0,3% |
20 000 – 50 000:±0,25% | |
@8 V AC | @1 V AC |
0,8 – 999: ±0,05% | 0,8 – 999: ±0,05% |
1 000 – 3 999: ±0,1% | 1 000 – 4 000: ±0,1% |
4 000 – 15 000: ±0,2% | |
Excitation current range: 0 – 2 A
Excitation current 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
Typical excitation current accuracy: ±(0,25% rdg + 500 μA)
Phase angle range: 0 – 360º
Phase angle resolution: 0,01º
Typical phase angle accuracy: ±0,05º
Display
LCD screen 20 characters by 4 lines;
LCD display with backlight, visible in bright sunlight
Interface
USB (standard)
RS232 (optional)
Data Storage
TRT4x can store up to 10 000 test results
Environmental Conditions
Operating temperature: -10 ºC – +55 ºC / 14 ºF – +131 ºF
Storage & transportation: -40 ºC – +70ºC / -40 ºF – +158 ºF
Humidity: 5% – 95% relative humidity, non condensing
Dimensions and Weight
Dimensions (W x H x D): 480 x 190 x 385 mm / 18.9 x 7.48 x 15.16 in
Weight: 9 kg / 19.8 lbs
Warranty：3 years
