Product Introduction
The UHV-S20B Three-phase DC Winding Resistance Tester is essential for ensuring the reliable operation of transformers, which are critical components in power systems. This device is used to test the DC resistance of transformers during delivery, installation, and preventive maintenance to detect manufacturing defects and predict potential issues.

Product Features
- Capable of testing Yn-type, Y-type, and △-type windings with three-phase testing capabilities.
- Supports a wide range of transformers with a maximum output current of 20A and a measurement range of 0 - 200Ω.
- Automatically calculates resistance change rates to ensure data stability and prevent misreading.
- Includes protections against back electromotive force, disconnection, and power failure.
- Features a thermal printer and supports data storage locally and via USB.
- User-friendly interface with a 7-inch true color screen and full touch control.

Technical Parameters

• Output Current: Single Phase: 20A, 10A, 5A, 1A, 0.1A; Three Phase: 10A+10A, 5A+5A, 1A+1A, 0.1A+0.1A
• Measurement Range: Varies by gear, with specific ranges for single and three-phase testing.
• Accuracy: ±(Accuracy×0.2%+2)
• Power Supply: AC220V±10%, 50/60Hz
• Operating Temperature: -10℃ to 50℃
• Relative Humidity: Less than 90%, non-condensing
• Dimensions: 400mm×315mm×223mm
• Weight: 9 kg