Main Functions




1. Automatically measure the connection group.

2. Automatically change groups, can directly measure the turns ratio of single-phase, three-phase transformers and instrument transformers.

3. Automatically switch phase sequence.

4. Automatically switch ranges.

5. Automatically calibrate the meter.

6. After inputting the standard turns ratio, it can automatically calculate the relative error.

7. After one measurement is completed, the test voltage is automatically cut off.

8. Measurement results are automatically saved, test data can be printed, and 20 historical measurement data can be stored.

Main Technical Indicators




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3. Accuracy: 1～1000 0.2级；1000～10000 0.5级



5. Operating ambient temperature: -5℃～40℃

6. Operating ambient humidity: <85%

7. Volume: 430×320×215 mm3

8. Weight: 5kg

Technical Parameters




Turns ratio range: 1～10000 Group range: 1～12

Measurement accuracy: 0.2%

Polarity: positive polarity, negative polarity

Operation




1. Wiring: Connect the instrument terminals (A, B, C, a, b, c) to the transformer terminals (A, B, C, a, b, c) correspondingly. Be careful not to reverse the high and low voltage connections, otherwise the instrument may be damaged.

2. Turn on the power switch, then it displays self-test 1; self-test 2; self-test 3; passed, indicating the instrument is self-testing. Finally, it displays the turns ratio, tap percentage, group, and the information display (error display) shows "Self-test passed", indicating the instrument is normal and the next step can be performed.

3. Press the key to input the turns ratio, tap spacing, and group in sequence until the parameter indicator goes out. If the parameters used in this test are the same as the previous ones, this operation can be omitted.

4. Use the tap adjustment key to adjust the tap position. Each time this key is pressed, the tap value moves by one tap spacing. If pressing the tap adjustment key has no response in the tap display, it means the tap spacing has not been set. At this time, press the parameter key to set the tap spacing.

5. Measurement

a. Three-phase continuous: Press the key, the key light is on, press the key, the key light is on, the instrument starts measuring and automatically enters the recording state. After each phase is measured, a prompt tone sounds, and it enters the next phase measurement. After all are completed, it stops automatically.

b. Single-phase: Press the key, the key light is on, press the key, the key light is on, the instrument starts measuring. After the error display stabilizes, record the data, press the key, the key light is on, completing the AB phase test. Similarly complete the BC and CA phase measurements.

6. Printing

a. If printing is required, you must press the record key before the measurement operation, the key light is on, the instrument enters the automatic recording state, and automatically records the data of each subsequent measurement operation. If the power is cut off, if the three-phase continuous function is used for measurement, the instrument automatically records, and there is no need to press the key before measurement.

b. Press the print key, the screen displays "Printing", and after a moment the screen displays "Print completed" to complete printing. If any key is pressed during printing, the screen displays "Print aborted", and you can exit printing midway. If there is no data in the memory, pressing the print key will cause the print key light and record key light to flash simultaneously, and the screen displays "Memory empty" and cannot print.

C. Of course, if the previous test data does not need to be retained, clear the data before the measurement operation. Press the key. If the memory is empty, the clear memory key light and record key light flash simultaneously, and the screen displays "Memory empty". If the memory is not empty, the screen displays "Clear memory?", then press the clear memory key again to clear the memory, or press any other key to abort clearing, and the screen displays "Clear memory aborted". When the memory is full, the and key lights flash to prompt. Press the key twice consecutively to clear old data.

7. Use of other function keys

a. key: If you need to observe the actual measured turns ratio during the measurement, press the key before measurement, the key light is on, indicating that the actual measured turns ratio can be displayed during the measurement. Press the key again, the key light goes off, and the actual measured turns ratio will not be displayed during the measurement.

b. key: Most transformers have taps on the high voltage side. When testing transformers with taps on the low voltage side, use this key, the key light is on, press this key again, the key light goes off. In most cases, this key light should be off.

c. key: If the group of a three-phase transformer is not known in advance, connect the three-phase transformer test leads, press the key, the key light is on, press the key, the instrument starts working, and it takes about 70 seconds. The group and turns ratio test results will be displayed. The instrument does not analyze the group of single-phase transformers, which is only 0 or 6. If the polarity is wrong, the group display window flashes to prompt an error. Some transformers may have errors when analyzing the group, but can measure normally with input parameters. The reason is that the transformer core lamination symmetry is not good, and when one column is excited, the magnetic distribution error of other columns is large.

d. key: Press the key, the instrument starts self-testing. First, it lights up all displays in sequence for the operator to check, then it checks whether the voltage divider and measurement circuit work normally.

e. Numeric keys: The numeric keys are composite function keys, effective when the key light is on. For example, when the parameter key light is on, pressing the key inputs 0; when the parameter light is off, pressing the key prints.