I. Product Overview
The HZTTR80A transformer ratio test set is a fully automatic testing device. It integrates functions for testing turn ratio, voltage ratio, vector relationship, winding connection group, polarity, tap position, and excitation current. This tester is a lightweight and portable instrument, with both the tester and its accessories housed in a multi-functional engineering plastic case that is resistant to cold, heat, moisture, and shocks, making it suitable for field tests. The test set can be used to test single-phase and three-phase transformers, both with and without taps. The instrument can be controlled entirely through a dedicated APP downloaded on an Android smartphone or tablet, facilitating the storage and upload of test data for easy retrieval.

II. Technical Parameters
Test Range: Ratio -- 0.9 to 10000, Current -- 0 to 2000mA, Angle -- 0 to 360°
Ratio Accuracy: 5V Range ±(0.1% + 2 digits) (0.9-50), ±(0.2% + 2 digits) (51-200), ±(0.5% + 2 digits) (201-600);
80V Range ±(0.1% + 2 digits) (0.9-500), ±(0.2% + 2 digits) (501-2000), ±(0.5% + 2 digits) (2001-10000)
Current Accuracy: ±(1% of reading + 0.5 mA)
Angle Accuracy: ±0.2°
Output Voltage: Selectable 5V or 80V
Resolution: Ratio -- Minimum 0.0001, Current -- 0.001mA, Angle -- 0.01°
Test Voltage: AC 5V @ 1A, AC 80V @ 80mA
Operating Power Supply: 220V AC, 50/60 Hz, Input Range: 100V to 240V
Ambient Temperature: -10°C to 40°C
Relative Humidity: ≤85%, non-condensing
Dimensions: Main Unit: 360290170(mm), Cable Box: 360290170(mm)

III. Main Features
▪ Capable of PT ratio and polarity testing.
▪ Equipped with blind test function to accurately measure transformer ratio and winding connection group even when the connection group of a three-phase transformer is unknown.
▪ Capable of testing autotransformers, Z-type transformers, and phase-shifting transformers.
▪ Includes tap mode settings to accommodate transformers with high voltage at high tap positions and low voltage at high tap positions.
▪ Incorporates low-voltage side tap settings for transformers with taps on the low-voltage side.
▪ Features graphical display settings for more intuitive readouts.
▪ During three-phase transformer testing, can simultaneously measure the ratio of all three phases, resulting in faster test speeds.