The KDB-II Transformer Turns Ratio Tester is a fully automatic, handheld instrument built for high-precision transformer testing. It uses a three-phase precision inverter power supply to eliminate mains harmonic interference, delivering accurate ratio measurements even when powered by generators. With automatic vector group recognition (0-11), it supports a wide range of transformer types and measures phase angles between windings. The 7-inch color touchscreen guides users through each step, while built-in protection mechanisms safeguard against short circuits and incorrect tap positions. Rugged, portable, and battery-powered, it is ideal for both laboratory and field use, enabling fast and reliable testing to ensure transformer performance and safety.

• Three-Phase Precision Inverter Power Supply: Eliminates mains harmonic interference, ensuring accurate readings even with generator power.• Automatic Vector Group Recognition: Identifies transformer vector groups (0-11) and measures inter-phase angles automatically.
• Wide Transformer Compatibility: Supports various types including Z-type, rectifier, grounding, furnace, and phase-shifting transformers.
• Comprehensive Protection Mechanisms: Built-in high/low voltage reverse protection, inter-turn short-circuit protection, and tap position error protection.
• 7-Inch Color Touchscreen: Modular display with step-by-step prompts for intuitive, easy operation without manual reliance.
• Battery-Powered & Portable: Lightweight (2kg) handheld design with battery operation, suitable for field testing.• External Printer Support: Connect to printers to print test data for traceable, paperless workflow.• Rugged & Weatherproof Housing: Cold-resistant, heat-resistant, waterproof, and shockproof for reliable performance in harsh environments.

Model: KDB-II• Test Range: 0.9 ~ 10000• Measurement Accuracy:

• ±0.1% ±2 digits (0.9–500)
• ±0.2% ±2 digits (501–2000)
• ±0.5% ±2 digits (2001–10000)• Angle Accuracy: ±0.2°• Resolution: 0.0001 (ratio), 0.01° (angle)• Power Supply: Battery-powered• Operating Temperature: -10℃ ~ 40℃• Relative Humidity: ≤85% (non-condensing)• Dimensions: 252 × 160 × 65 mm (host)• Weight: 2 kg (host)• Standard Test Line Length: 13 m (customizable)