Rental tester TRAN-203 Three-phase Transformer Analyser

The TRAN-203 is an advanced test unit designed to analyse key transformer parameters, suitable for both three-phase and single-phase transformers. With its user-friendly interface, rugged build quality and extensive test capabilities, this device delivers accuracy and speed in one solution.

Turns ratio measurement (TTR)
Accurately measures transformer turns ratio in accordance with the ANSI/IEEE C57.12.90 standard, with precision down to 0.08%.

Winding resistance analysis
Automatic winding resistance measurements up to 100 kΩ without disconnecting test leads.

Heat run / temperature rise test
Simulate long-term load conditions and evaluate temperature rise using up to 20 A DC test current.

Core excitation test & vector detection
Measure excitation current, phase angle and polarity, with automatic vector group detection.

On-site printing
With the built-in 2.28″ thermal printer, test results can be printed immediately on site.

Easy to use

Large 7″ colour touchscreen display: clear visualisation of measurements and intuitive navigation.
PC software support
IP67 enclosure: robust and reliable for field use.

What’s included as standard?

Each TRAN203 rental includes all essential cable sets and accessories: measurement and extension leads, grounding cable, tap changer cable, USB cable, printer paper, software USB stick and carrying case.

Available for rental

From April – an ideal all-in-one solution for inspections, maintenance projects, commissioning and periodic transformer testing in networks and installations.

Why choose the TRAN-203?

With the TRAN-203, you get a complete transformer analysis tool: fast, reliable and easy to use. Prevent unexpected failures, document results instantly and work flexibly — whether in the workshop or on site.

Key advantages

Turns ratio measurement – from 0.8 to 50,000, suitable for CTs and PTs.
Winding resistance measurement – up to 20 A DC, also suitable for large transformers.
Temperature rise testing – simulate operating conditions and verify thermal performance.
Demagnetisation function – remove residual magnetism for more accurate results.
Automatic vector group recognition and phase angle measurement (accuracy ±0.2°).
Built-in printer – print results instantly on site.

Turns Ratio

Measurement methodology in accordance with ANSI/IEEE C57.12
Test voltages for PT mode: 1 V, 4 V, 10 V, 40 V, 100 V, 250 V
Test voltages for CT mode: 1 V and 4 V
Ratio range: 0.8 to 50,000
Phase angles: 0–360° with ±0.2° accuracy
Excitation current up to approx. 2 A
Excitation current accuracy: ±0.1 mA

Winding Resistance

Test voltage: 50 V
Test current: from 0.001 A to 20 A (adjustable)
Measurement range: from 0.1 µΩ to 100,000 Ω
Accuracy and resolution specifications:
• 1 A – 20 A: 0.00 µΩ to 50 Ω, ±0.1 % rdg ± 0.5 µΩ, resolution 0.1 µΩ
• 0.1 A – 1 A: 0.00 mΩ to 500 Ω, ±0.1 % rdg ± 10 µΩ, resolution 1 µΩ
• 10 mA – 100 mA: 0.00 mΩ to 5 kΩ, ±0.1 % rdg ± 100 µΩ, resolution 10 µΩ
• 1 mA – 10 mA: 1 kΩ to 100 kΩ, ±0.1 % rdg ± 50 Ω, resolution 10 Ω
Resolution: 5 digits
OLTC (tap changer) monitoring support
Automatic safety protection in case of circuit fault

General

Power supply: 100–240 V, 47/63 Hz
Optional battery: 14.4 V Li-Ion, approx. 6.9 Ah (for TRAN-203B / TRAN-203B BLUE models)
Internal memory for storing results
Printer: built-in thermal printer (2.28 inch)
Communication: USB 2.0 / 1.1 (Type A and B)
Display: 7-inch colour touchscreen
Dimensions (L × W × H): 429 mm × 328 mm × 236 mm
Weight: approx. 9.5 kg
Operating temperature: –10 °C to +60 °C
Storage temperature: –30 °C to +70 °C
Humidity: up to 95% relative humidity, non-condensing
Protection class: IP67 (with lid closed)