Transformer turns ratio testing is one of the most important routine tests for verifying transformer condition, winding integrity, tap changer performance, and correct transformer configuration.
For utilities, service companies, power plants, substations, and industrial maintenance teams, a turns ratio tester must do more than provide a basic ratio reading. It should help technicians test accurately, reduce manual steps, support different transformer types, and produce reliable field results.
The DV Power TRT Advanced Series is designed for this purpose. According to DV Power, the TRT Advanced Series is its newest solution for transformer turns ratio measurement. In addition to turns ratio testing, the series also measures excitation current and phase shift, performs automatic vector group detection, and supports magnetic balance testing on three-phase transformers and three-phase autotransformers.
Built for Advanced Transformer Testing
The TRT Advanced Series includes multiple models for different testing needs, including TRT100, TRT250, TRT400, and TRT500.
Depending on the model, the instruments can output test voltages from 1 V AC up to 500 V AC. The TRT500 provides the highest test voltage in the series at 500 V AC, making it suitable for accurate turns ratio testing of power transformers used in generation and transmission applications.
For specialized applications, the TRT500 test voltage can be boosted up to 5 kV AC with an external CVT20 extension transformer. This is designed for turns ratio testing of capacitive voltage transformers.
True Three-Phase Testing Capability
A key advantage of the TRT Advanced Series is its built-in true three-phase power source.
This allows the instrument to test transformers with more complex configurations, including phase-shifting transformers, rectifier transformers, arc-furnace transformers, traction transformers, and other special transformer designs.
For technicians working with more than standard distribution transformers, this capability can make the testing process more practical and complete.
More Than Ratio Measurement
Turns ratio is the primary measurement, but the TRT Advanced Series goes further.
The instrument series also supports:
Excitation current measurement
Phase shift measurement
Automatic vector group detection
Magnetic balance testing
Three-phase transformer and autotransformer testing
These functions help users evaluate transformer condition and verify correct connections with greater confidence.
Touch-Screen Interface for Field Work
The TRT500 is equipped with a large 10.1-inch graphical touch-screen display. Other models in the series use a 7-inch graphical touch-screen display.
This interface is designed to make field testing easier compared with older-style turns ratio testers. It also brings useful workflow features directly into the instrument, including test templates and automatic test mode.
Technicians can create test templates, store them in the instrument memory, and load them in the field with just a few clicks. This is especially useful when repeating similar tests across multiple transformers or sites.
Automatic Test Mode and OLTC Control
The TRT Advanced Series includes a built-in tap changer control unit. This allows remote control of an on-load tap changer directly from the instrument.
When combined with automatic test mode, the instrument can be programmed to run turns ratio tests, change OLTC tap positions, and save results automatically.
This helps reduce manual operation, shorten testing time, and minimize human error. For transformers with many tap positions, this can make a major difference in field productivity and result consistency.
Practical Specifications
Based on the DV Power product page, the TRT Advanced Series offers:
Test voltage: 1 V to 500 V AC, depending on model
Typical accuracy: from +/- 0.03%
Ratio range: 0.8 to 50,000
Test voltage type: true three-phase and single-phase
Vector group detection: automatic
Weight: from 9 kg to 10.5 kg, depending on model
These specifications position the TRT Advanced Series as a portable but advanced transformer turns ratio testing solution for both routine and more demanding field applications.
Why It Matters
Transformer testing is not only about collecting numbers. It is about making accurate decisions.
A well-designed turns ratio tester helps confirm transformer ratio, detect winding or tap changer problems, verify vector group, measure excitation current, and support documentation for maintenance or commissioning work.
The DV Power TRT Advanced Series combines high test voltage options, true three-phase testing, automatic vector group detection, touch-screen operation, test templates, OLTC control, and automatic test mode in one field-oriented platform.
For teams that test transformers regularly, these features can improve speed, consistency, and confidence in every test.
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