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WR.40S Three Phase Transformer Winding Resistance Tester

The WR.40S DC winding resistance tester is designed for precise measurement of DC resistance in inductive devices such as transformers and power inductors. Compact yet highly accurate, it provides fast measurement cycles with polyphase winding resistance and demagnetization functionality.

Engineered for transformers up to 7MVA / 35kV models, the WR.40S ensures reliable performance in both field and laboratory environments.

Key Features

  • Designed for transformers and large inductive equipment

  • Polyphase winding resistance measurement

  • Built-in demagnetization function

  • Compact design with high accuracy and fast cycles

  • Storage for 200 test groups

  • Suitable for transformers up to 7MVA / 35kV

Technical Specifications

Current

  • Single phase: 1A, 5A, 10A, 20A, 40A

  • Three phase: 1A, 5A, 10A, 20A

Range

  • Single phase:

    • 1A: 10mΩ–20Ω

    • 5A: 1mΩ–4Ω

    • 10A: 1mΩ–2Ω

    • 20A: 1mΩ–1Ω

    • 40A: 1mΩ–0.5Ω

  • Three phase (per phase):

    • 1A: 10mΩ–6Ω

    • 5A: 1mΩ–1Ω

    • 10A: 1mΩ–0.6Ω

    • 20A: 1mΩ–0.3Ω

Accuracy

  • ±0.2% (full range)

Max Resolution

  • 0.1μΩ

Data Saving Capacity

  • 200 groups

Power

  • AC 220V ±22V, 50Hz ±2Hz

Working Environment

  • Temperature: 0–40℃

  • Relative humidity: ≤80%

Dimensions

  • 428 × 350 × 230 mm

Weight

  • 13.4 kg

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