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WR.20S Three Phase Transformer Winding Resistance Tester

The WR.20S is a compact, high-accuracy DC winding resistance tester designed for measuring the DC resistance of inductive devices such as transformers and power inductors. With support for both single-phase and three-phase test modes, fast measurement cycles, and built-in demagnetization, it is an ideal solution for transformer winding resistance testing up to 7 MVA / 35 kV.

Key Features

  • Compact and lightweight design for field and lab use

  • Supports both single-phase and three-phase resistance testing

  • Polyphase winding resistance and demagnetization function

  • High accuracy (±0.2% of reading) across test ranges

  • Built-in printer and real-time data storage for streamlined reporting

  • Suitable for transformers up to 7 MVA / 35 kV

Technical Specifications

Test Mode – Single Phase

  • 20A Test Range: 0.200mΩ – 1.000Ω

  • 10A Test Range: 1.000mΩ – 2.000Ω

  • 5A Test Range: 10.00mΩ – 4.000Ω

  • 1A Test Range: 100.0mΩ – 20.00Ω

  • 0.2A Test Range: 1.000Ω – 100.0Ω

Test Mode – Three Phase

  • 10A + 10A Test Range: 1.000mΩ – 0.800Ω

  • 5A + 5A Test Range: 10.00mΩ – 1.600Ω

  • 1A + 1A Test Range: 100.0mΩ – 8.000Ω

  • 0.1A + 0.1A Test Range: 2.000Ω – 80.00Ω

Test Accuracy

  • ±0.2% of reading

Print and Store

  • Built-in printer for easy data output

  • Real-time data storage

Power Supply

  • AC 220V ±10%, 50/60Hz

Size

  • 400 × 315 × 223 mm

Weight

  • 9 kg

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