I. Overview

1.1 Product Overview
The HZTTR80AP transformer ratio test device is a fully automatic tester. It integrates the testing functions of turn ratio, voltage ratio, vector relationship, winding connection, 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, sealing, waterproof, and shockproof, making it convenient for field tests. This test device can be used to test single-phase and three-phase transformers, both with and without taps. The instrument can be controlled throughout using a dedicated APP downloaded on an Android phone or tablet, allowing for the storage and upload of test data for easy review.

1.2 Main Functional Features
▪ Capable of PT ratio and polarity testing.
▪ With a blind-testing function, it can accurately measure the turns ratio of a three-phase transformer even when its connection group type is unknown. It can also correctly determine the phase relationship between the primary and secondary sides and accurately calculate the group number.

▪ Capable of testing autotransformers, Z-type transformers, and phase-shifting transformers.
▪ Added tap mode settings to accommodate transformers with high voltage at high tap positions and low voltage at high tap positions.
▪ Added low-voltage side tap settings to accommodate transformers with taps on the low-voltage side.
▪ Graphical display settings for more intuitive readings.
▪ Simultaneous measurement of three-phase ratios during three-phase transformer testing for faster testing speed.

▪ It is powered by a high-capacity lithium battery, enabling not less than 1,000 measurements to be conducted on a single charge.
▪ It features an automatic shutdown function. If the instrument is not operated within 30 minutes, it will emit an alarm and then turn off the power.

1.3 Panel Description 

1. Grounding Terminal: Before conducting any tests, please safely ground the grounding terminal to avoid the risk of electric shock.

2. Charging dock and switch: The charging dock serves as the charging input port for the battery, while the switch is used to turn the tester's power on or off.

3. High-voltage side connection terminals: There are three-color (yellow, green, red, and black, with the black one being counted as part of the color indication context here for understanding the connection mapping, though technically it's a single additional color column beyond the three primary phase colors) binding posts, corresponding to connection with the A, B, C, N phases of the high-voltage side of the transformer being measured.

4. Low-voltage side connection terminals: There are three-color (yellow, green, red, and black, similarly, the black one is included in the context for connection mapping explanation) binding posts, corresponding to connection with the a, b, c, n phases of the low-voltage side of the transformer being measured.

5. High-Voltage Side Terminals: Yellow, green, and red terminals for connecting to the A, B, and C phases of the high-voltage side of the transformer under test.

6. Low-Voltage Side Terminals: Yellow, green, and red terminals for connecting to the a, b, and c phases of the low-voltage side of the transformer under test.

7. RS232 Communication Interface: Interface for computer communication.

8. Printer: Prints test results.

9. USB: Connects to a USB flash drive for data export.

10. Display Screen: 7-inch high-definition color touchscreen LCD with adjustable backlight for displaying the operation menu and test results.