Transformer turns ratio testing is an essential part of transformer commissioning, maintenance, and troubleshooting. It helps verify the relationship between primary and secondary windings, confirm correct transformer connections, identify winding problems, and support tap changer assessment.
For field teams and test engineers, the right turns ratio tester should provide accurate measurements, practical operation, and enough flexibility to handle different transformer configurations.
The DV Power TRT Standard Series is designed for transformer turns ratio testing with test voltages up to 250 V AC, depending on the selected model. According to DV Power, each model also measures transformer excitation current and phase shift, performs automatic vector group detection, and supports magnetic balance testing on three-phase transformers and three-phase autotransformers.
A Practical Series for Transformer Ratio Testing
The TRT Standard Series is positioned as an advanced LCD-display transformer turns ratio tester family.
It is designed for standard and more complex transformer applications, including transformers with special configurations such as phase-shifting transformers, rectifier transformers, arc-furnace transformers, and traction transformers.
This makes the series useful for utilities, transformer manufacturers, service companies, industrial plants, substations, and maintenance teams that need reliable turns ratio results across a wide range of transformer assets.
Model Families in the TRT Standard Series
The TRT Standard Series includes three main model groups:
TRT03 Models: TRT03A, TRT03B, and TRT03C, with single-phase voltage up to 100 V.
TRT33 Models: TRT33A, TRT33B, and TRT33C, with single-phase and true three-phase voltage up to 100 V.
TRT63 Models: TRT63A, TRT63B, and TRT63C, with single-phase and true three-phase voltage up to 250 V.
This model structure gives users a way to choose the right configuration based on transformer type, required test voltage, and whether true three-phase testing is needed.
Test Voltage from 1 V to 250 V AC
Depending on the model, the TRT Standard Series can output test voltages from 1 V AC to 250 V AC.
The higher 250 V AC test voltage can support more accurate turns ratio testing compared with lower-voltage instruments in demanding transformer applications. At the same time, the low 1 V AC test voltage enables turns ratio verification of current transformers.
This flexibility is valuable when one testing platform needs to support different field tasks.
Built-In True Three-Phase Power Source
Selected TRT Standard models include a built-in true three-phase power source.
This capability helps technicians test transformers with more complex configurations and reduces the need for workaround procedures when testing three-phase transformers or autotransformers.
For applications involving special transformer designs, true three-phase voltage output can make testing more complete and efficient.
More Than Turns Ratio
The TRT Standard Series is not limited to basic ratio measurement.
The instruments also support:
Excitation current measurement
Phase shift measurement
Automatic vector group detection
Magnetic balance testing
Three-phase transformer and autotransformer testing
These additional measurements help users better understand transformer condition and verify that the transformer is connected and operating as expected.
OLTC Control and DV-TR Software
The TRT Standard Series includes a built-in tap changer control unit, allowing remote control of an on-load tap changer directly from the tester.
Using DV-TR software, users can create test templates and store them on a PC for later field use. The software can also be programmed to automate the testing process by running turns ratio tests, changing OLTC tap positions, and saving results.
This is especially useful for transformers with many tap positions, where manual operation can be time-consuming and more prone to error.
Key Specifications
Based on the DV Power product page, the TRT Standard Series offers:
Test voltage: 1 V to 250 V AC, depending on model
Typical accuracy: up to +/- 0.03%
Ratio range: 0.8 to 50,000
Test voltage type: true three-phase and single-phase, depending on model
Vector group detection: automatic
Weight: from 8 kg to 9 kg
These specifications make the TRT Standard Series a portable and capable solution for routine transformer testing and field service work.
Why It Matters
Turns ratio testing is a simple idea, but field execution can become complex when transformers have multiple tap positions, different vector groups, or special configurations.
The DV Power TRT Standard Series helps make that process more structured. With model options up to 250 V AC, automatic vector group detection, excitation current and phase shift measurement, magnetic balance testing, OLTC control, and DV-TR software support, the series gives technicians a practical platform for accurate transformer turns ratio testing.
For teams that need dependable transformer ratio testing without moving into the touch-screen Advanced Series, the TRT Standard Series offers a strong balance of capability, portability, and field usability.
Contact us
