I. Overview

      Huazheng Electric HZBB-10B-I Intelligent tester of Transformer Ratio and Connection Groups adopts popular ARM processor, 168M frequency, 128M memory available to be extended to 4G memory card. The LCD screen adopts7-inch high-definition color touch screen, combined with emwin display, making the tester interface simple and user-friendly in full touch screen and non-keyboard operation. The tester supports database and can be exported from the USB drive or through the data cable to the background computer.

      Elaborate and compact design, unique thinking, makes the tester superior and powerful with small size and light weight. The tester uses a programmable signal source, can output single-phase, two-phase or three-phase standard Sine signal or high-frequency Sine signal, with adjustable output phase frequency. The tester adopts the new algorithm developed by our company to measure the ratio of three-phase transformer and ensure the measurement accuracy without adjusting the balance of the three-phase power supply. Therefore, the transformer ratio and wiring method can be measured in about 3 seconds.

Wiring and notice: When using the tester, please follow the instructions.

1. The ground terminal or the ground wire in the power cable should be grounded reliably.

2. Please note that the four-color test wires at the high-voltage side in yellow, green, red and black correspond respectively to the transformer A, B, C, N terminals. The three-color test wires at the low-voltage side in yellow, green and red correspond respectively to the transformer a, b, c, n terminals. Be sure to make correct connections.

3. When testing the Scott transformer, the high voltage side is the same as the above, low-voltage side a, β, n correspond to a, b, c terminal.

For single-phase transformer, high-voltage side A, X correspond to A, C terminals, low-voltage side a, x corresponds to a, c terminals.

4. For general Y / y, Y / d, D / d, D / y, normal connection group measurements, connection to the neutral point N terminal is not needed. For single-phase transformer measurements, please use the yellow, green test clips at high-voltage side and the yellow, green test clips at low-voltage side. ZN / y, ZN / d can only measure voltage ratio.

5. Please enter correct setting parameters before test. The group label and the measured transformer must be consistent. If not sure, choose unknown to be measured by the tester automatically.

6. If you the rated ratio is not put in, results only show the measured ratio value, and do not show the error.

7. The instrument should use the built-in output of the instrument for testing, and use a standard voltage divider for testing. It should not use a standard voltage transformer for testing. (Accuracy cannot be guaranteed due to non-linear errors in the voltage transformer).

II. Main Functions and Characters

1. The tester makes automatic measurement with no need to set any parameters and automatically completes the three-phase ratio and connection group measurements with easy operation. All you need to do is to press a button.

2. The tester measures three-phase and single-phase transformer ratios automatically, and calculates the ratio error.

3. Built-in three-phase signal source, which can measure the transformation ratio of transformers of various connection groups such as Y / y, Y / d, D / y, D / d.

4. It can measure the label and polarity of the transformer connection group, and display the primary and secondary wiring vector diagrams, which are intuitive and clear; the instrument has a self-calibration function, which can judge the test line or the instrument failure based on the self-calibration results.

5. The tester can track the transformer on-load tap-changer position automatically, and indicate the current tap point automatically.

6. The tester can display a transformer’s first and secondary voltage Oscillograms and phase relationship. It can measure transformer’s first and second harmonic voltages, to facilitate the analysis of transformer failure.

7.  The tester is with CT, PT ratio, polarity testing function

8. The tester has perfect and reliable automatic protection, to ensure the intactness of the tester under abnormal conditions.

9. The tester has small size and light weight. It makes accurate measurement at fast speed (about 3 seconds to complete the test).

10. The tester is available to store and print all the test results. It has Built-in 128M memory (extendable to 4G memory card), available to export the database by USB, or upload to computer. The database supports excel spreadsheet opening.

11. The tester has7-inch true color touch screen operation, emwinGUI interface and support English input, which is easy and convenient. It also has no power-down calendar and clock function. The test time can be stored at any time.

12. The tester support on-site record print by Bluetooth or serial printer.

III. Main Technical Specifications

1. Ratio measurement range: 0.8-20000

2. Ratio measurement accuracy:

 0.2%（0.8-1000），0.5%（1000-5000）,0.1%（0.8-2000），0.2%（2000-20000）( customized)

3. Working power: AC220V  

4. Operating temperature: -10 ℃ -40 ℃

5. Environmental humidity: 10% -85%

6. Volume: 270 × 190 × 70mm

7. Weight: 2kg (not including test wires)